The Tax Disputes and Litigation Review: Belgium


Belgian tax procedures vary slightly depending on the type of tax. However, a common feature of Belgian tax procedures is that there is no fee or cost due to the tax authorities or to the courts. The taxpayer may defend itself before the tax authorities and the courts, and thereby avoid paying fees to counsel.

Tax procedures may be slow. The tax authorities may revisit taxpayers' files after several years, administrative appeals may take several months and the courts are under-resourced. Nevertheless, most misunderstandings are swiftly settled at the stage of an administrative procedure organised as a series of open discussions where the taxpayer has access to the tax authorities' files.

Special services have been organised within the tax authorities to serve as intermediaries between taxpayers and the services in charge of assessing taxes. The Ruling Commission was created to prevent disputes, while the Tax Conciliation Service was created to assist taxpayers in tax disputes.

This chapter focuses on income tax disputes and the procedure organised by the federal legislation.2

Commencing disputes

i Audit of the taxpayer's situation

Most taxes are assessed on the basis of tax returns filed by taxpayers.3 Tax disputes most often commence with a review of tax returns.

In the absence of a timely return,4 the taxpayer has the burden to demonstrate the exact amount of income (Article 352 of the Income Tax Code (CIR1992)). Also, proportional surtaxes apply (Article 444 CIR1992).5 In addition, a taxpayer subject to corporate tax is taxed on a minimum tax base of €40,000. If the infringement is repeated, the latter amount may be increased up to €80,000 (Article 342(4) CIR1992).

The tax authorities are allowed to adjust the taxpayer's income on the basis of any means of evidence, excluding oath (Article 340 CIR1992).6 They may investigate the taxpayer's situation for a period of three years from the beginning of the assessment year.7 This period may be extended for an additional four years, provided that the authorities first notify the taxpayer in writing about any signs of a wilful attempt to defeat or evade tax related to the period under examination (Article 333 CIR1992). The taxpayer must also be notified when the authorities request information from other persons.8 However, the consultation of databanks does not qualify as an investigation.9 Signs of fraud are sufficient; the authorities do not need to demonstrate the wilful attempt to defeat or evade tax at the time of this notification.10,11

The tax authorities may also investigate during a seven-year period without prior notification upon request of another country with which Belgium is bound by an exchange of information agreement (Article 333 CIR1992).

If the authorities receive information from a foreign country bound by an exchange of information agreement, they are allowed to further investigate for the purposes of establishing that the taxpayer omitted to report income that should have been reported within the five-year period before the year during which the information from the foreign country has been made available to them. They may do so for two years after the day on which they receive the information from abroad (Article 333/2 CIR1992).12

The tax authorities are also allowed a one-year time extension to investigate on withholding tax on income from movable property if an investigation shows that the taxpayer misapplied that tax once over the previous five years (Article 333/3 CIR1992).

If a taxpayer files a complaint against a tax bill, the tax authorities may also conduct further investigations for the purposes of deciding on the taxpayer's grievances (Article 374 CIR1992).

Investigations may thus be conducted long after the seven-year period during which taxpayers must keep their books (Article 315 CIR1992 and the Act of 8 June 2008).

The tax authorities may request that the taxpayer show them any document necessary to determine its tax liability (Article 315 CIR1992). The tax authorities may require the taxpayer to supply information within one month or may allow a time extension if necessary (Article 316 CIR1992). Taxpayers who keep data in a computerised system must deliver such information in the form that the tax authorities require.

The tax authorities may also access the premises where the taxpayer conducts a business during business hours (Article 319 CIR1992). The right to access the premises cannot lead to a raid.13

The tax authorities are allowed to keep the taxpayer's books and documents that they deem necessary to determine the amount of taxable income. They are not allowed to take books that are not closed (Article 315ter CIR1992).

Information obtained on the occasion of the audit of a taxpayer may be used for the purpose of taxing other taxpayers (Article 317 CIR1992).14 The tax authorities may also request from any taxpayer information deemed necessary to determine the tax liability of any other taxpayer (Article 322 CIR1992). They may require bulk information on transactions of persons and groups of persons directly or indirectly involved in such transactions (Article 323 CIR1992).

The tax authorities may also request information from a bank with the purpose of taxing targeted customers if they suspect fraud or intend to impose a tax on the basis of evidence of wealth, unless the taxpayer (who must be informed of the intent to proceed with bank investigations) provides the requested information within one month. For the purposes of satisfying a request from another country, the tax authorities may investigate banks' files without giving prior notification to the taxpayer if the other country explicitly requests not to inform the taxpayer or if the other country demonstrates that it has already notified the taxpayer (Article 333/1 CIR1992).

In criminal matters, pieces of evidence obtained irregularly cannot be set aside unless the irregularity affects the reliability of the evidence or the right to a fair trial or if compelling formalities have been disregarded (Article 32 of the Criminal Procedure Code). The Supreme Court has expanded this rule to pieces of evidence obtained by the tax authorities and used to establish a tax.15

Information requested by or provided to foreign countries is not disclosed to the taxpayer before the investigation by the foreign country is closed (Article 337/1 CIR 1992).

ii Debates prior to assessment

If the tax authorities intend to adjust the taxpayer's tax liability, they must send it a notice of deficiency (Articles 346 and 351 CIR1992). The notice of deficiency, which is an invitation to discussion, must mention all the elements on which the intended adjustment is based. No tax can be imposed on elements other than those in the notice.16

The taxpayer is allowed one month to answer the notice of deficiency (this is not applicable in respect of withholding tax or if the rights of the Treasury are jeopardised). The one-month period starts running from the third working day following the sending of the notice of deficiency. The tax cannot be assessed before the end of this one-month period.

Before assessing the tax, the tax authorities must reply to the arguments of the taxpayer (notification of assessment)17 (Articles 346 and 352 bis CIR1992). Although the assessment must be justified by elements mentioned in the notice of deficiency, the tax authorities may still change their legal analysis of the same elements. They may also use the same motives in the notification of assessment as in the notice of deficiency if the taxpayer does not submit new arguments.18

Despite the taxpayer's disagreement, the tax may be assessed and established as a debt.19

iii Limitations on assessment

When the taxpayer files an accurate tax return in a timely manner, the tax must be assessed before 30 June of the year following the assessment year or six months after the filing of the tax return, whichever is later (Article 353 CIR1992).

However, if the taxpayer fails to file its return in a timely manner, or the tax authorities determine that the amount of tax due is higher than the amount resulting from the items reported in the return,20 the tax may be assessed within three years of the beginning of the assessment year (Article 354 CIR1992).21 This three-year limitation period is extended for a further four years in cases of wilful attempts to defeat or evade tax (Article 354 CIR1992).22 If the authorities do not need to further investigate during the additional four-year period, they are not required to notify the taxpayer of signs of fraud.2324

The tax may be assessed within the seven-year period even if the authorities did not firstly make use of the three-year period of Article 354 CIR1992 in the absence of a timely tax return.25

The tax may be assessed beyond these limitations in the following circumstances (Article 358 CIR1992):

  1. withholding tax on movable property income and PAYE unpaid during the five preceding years may be assessed during the year following the statement of the infringement;26
  2. if it appears from information received from a foreign country bound by an agreement on the exchange of information or from further investigation lead by the Belgian authorities that items of income have not been reported when they should have been reported during one of the five years (or seven years in case of fraud) preceding the year during which the information passed on by the foreign authorities is received by the Belgian authorities, the tax on such income may be assessed during a period of 24 months following the exchange of information;
  3. if a judicial procedure shows that items of income should have been reported within the five years before the year of the commencement of the proceedings, the tax may be assessed on such income during the 12 months after a court decision on the case has become final;27
  4. when evidence shows that income should have been reported during the five years before the year during which the evidence became known to the tax authorities, the tax on that income may still be assessed during the 12 months following the time that the authorities obtained the information; and
  5. taxes still due after a mutual agreement procedure or an arbitration procedure may be assessed within the 12-month period running after the procedure has been closed.

There is no time limit for adjusting the value of understated assets or overstated liabilities: they are deemed to be income of the year under examination unless the taxpayer demonstrates that they have already been taken into account to determine its tax situation (Article 361 CIR1992).28

The tax authorities may challenge the amount of deductible previous losses when they are used to offset taxable income. This means that they can challenge the profits and burdens of previous years that resulted in the losses carried over, regardless of the year to which they relate.29

If the tax director invalidates a tax bill further to a complaint filed by the taxpayer (see below) on grounds other than the statute of limitations, the tax authorities may assess an alternative tax computed on the same items as those on which the invalid tax had been computed within the three-months after the tax director's decision becomes final (Article 355 CIR1992).

iv Limitations on collection

The Treasury is time barred if it does not collect taxes within five years after those taxes become undisputedly due. Statute of limitation is interrupted by the taxpayer's acknowledgement of its tax debt or by a writ of summons served by a bailiff or registered mail (Article 443 bis CIR1992; Articles 23 and 24 of the Code of Enforcement).

Statute of limitations on collection is suspended pending an administrative appeal or a petition filed by the taxpayer (Article 443 ter CIR1992; Article 25 of the Code of Enforcement).30

v Tax complaints

The taxpayer may bring a complaint against a tax bill before the tax director. The complaint is an administrative appeal against the tax, and is a prerequisite before bringing the dispute before a court (Article 1385 undecies of the Judicial Code). The same rule applies to self-assessed taxes.31

The complaint must be filed within six months and three working days of the tax bill being sent (Article 371 CIR1992). The stamp of the post office on a registered mail is deemed to be the date of application.

If the complaint is filed in a timely manner, the collection of the contested amount of tax is restricted for the period during which the proceeding is pending (Article 410 CIR1992; Article 61 of the Code of Enforcement). Despite the fact that the taxpayer may retain the payment of the contested tax, it will owe interest on the amount if it is unsuccessful. If the taxpayer pays the tax assessed (or if the authorities use a tax refund to offset the contested tax) and if it wins the case, interest will be paid to it provided that the taxpayer served a summons (Article 418 CIR1992). The legal annual interest rate in tax matters was 7 per cent until 31 December 2017 (Act of 5 May 1865 on interest-bearing loans). As from 1 January 2018, the rate is 4 per cent in favour of the Treasury, and 2 per cent in favour of the taxpayer (Articles 414 and 418 CIR1992).

Before making a decision, the tax director, if so requested in the complaint, must invite the taxpayer to argue orally the points therein, and to consult the tax authorities' file. The tax director is expected to make his or her decision within six months of the filing of the complaint, or nine months in the absence of a tax return filed in a timely manner or in assimilated circumstances. Usually, the tax director takes much longer than six months to review a file; he or she may even take several years. In the absence of a decision after this six- or nine-month period, the taxpayer may bring its case before a court (Article 1385 undecies of the Judicial Code). In the absence of a decision six months after the filing of the complaint, late interest stops running on the disputed tax debt until the case is brought before a court (Article 414 CIR1992).

The tax director cannot impose additional tax or use relief to offset any new deficiency that he or she may find (Article 375 CIR1992). Nevertheless, the tax director's interpretation of the facts presented by the tax inspector may support the assessment, provided that he or she does not make the taxpayer's situation worse. However, the fact that a taxpayer has filed a complaint does not hamper the tax authorities from further investigating the taxpayer's situation and adjusting the tax liability within the time limits mentioned above (see Section II.iii).

A complaint against tax assessed on the basis of contested elements amounts to a complaint against any tax assessed on the basis of the same elements (Article 367 CIR1992). If the complaint relates to the deduction of expenses made during a given taxable period, and such expenses cannot be fully deducted from the profit of that taxable period, the complaint also affects the taxes relating to subsequent periods during which the excess of these expenses have been deducted.32

An additional tax assessed after an adjustment of the taxable basis (understated or hidden items of income) is never considered as assessed on the same elements as those taken into account when determining the initial tax bill. If the taxpayer is time-barred to complain against the initial tax bill, it cannot rely on a complaint against the additional tax bill to obtain the invalidation of the initial one. However, it may criticise elements taken into account when computing the initial tax bill to obtain the rescission of the additional tax bill.33

If the tax authorities base an additional tax for an assessment year on elements that have already been taxed in another assessment year, the taxpayer may file a complaint against the previous tax bill based on the same elements within six months and three working days of the sending of the additional tax bill (Article 373 CIR1992).

The tax director is not required to apply Article 6(1) of the ECHR because the tax director is not an independent jurisdiction.34

vi Tax rescission

The tax director may also rescind surtaxes resulting from clerical errors or misunderstandings of facts, double taxation or evidence that could not be invoked in a timely fashion for reasons beyond the taxpayer's power, provided that the surtaxes are brought to the director's attention within five years from 1 January of the year during which the tax has been assessed, and he or she has not decided on a complaint against the contested surtax (Article 376/1 CIR1992). 35

An error that results from a standpoint of the taxpayer when filling in the tax return is not a clerical error.36 When the reported profit appears from the financial statements, the taxpayer cannot amend the results of a choice it made when establishing those statements, as opposed to an erroneous recording of a transaction.37

New legislation or case law cannot be viewed as new circumstances that may lead to rescission.38 However, if the Constitutional Court holds that a tax law provision conflicts with the Constitution, the taxpayer may request that a tax imposed by virtue of such a provision be rescinded even if the Constitutional Court's decision has been officially released within the six-month period allowed to file a complaint and therefore the taxpayer was able to file a complaint (see Section II.iv).39,40

The tax authorities admit that a ruling of the European Court of Justice stating that Belgian law is in conflict with EU Law may also lead to rescission.

If a Belgian legal provision is annulled by the Constitutional Court, the taxpayer may file a complaint against a tax imposed pursuant to the annulled provision although ordinary time limits have expired. The issue is whether a ruling of the European Court of Justice (ECJ) stating that a national provision is conflicting with EU law amounts to a ruling of the Constitutional Court annulling a notional provision and, as a consequence, the same time limits would apply to contest a tax established pursuant to a provision criticised by the ECJ or pursuant to a provision annulled by the Constitutional Court.

The tax director may also rescind surtaxes that appear on the occasion of a mutual agreement procedure organised under a double tax treaty or a procedure provided by the EU Arbitration Convention (Article 376(3)(3) CIR1992).

The courts and tribunals

i Petition before the tribunal

If the taxpayer is not satisfied with the tax director's decision, it may file a petition before the court of first instance (the tribunal) within three months and three days after the decision has been sent. The petition must address the validity of the tax bill and not the validity of the director's decision.41

The director's decision is irrevocable if the taxpayer does not file a petition against it.42 If the tax director fails to render his or her decision within six months of the filing of the complaint (nine months in the absence of a tax return filed in a timely manner or assimilated circumstances), the taxpayer may bring its case before the tribunal.

If the director annuls or rescinds the tax for any reason, a petition aiming at a revision of the motives for the annulment or rescission is not admissible; the only purpose of a petition is the annulment or rescission of the tax.43

Tax cases are handled by independent judges specialising in tax matters. Ordinarily, tax cases are submitted to a chamber of one judge.44 Only in very specific circumstances a case can call for a chamber of three judges.

A tax petition is not admitted if the administrative procedure has not been exhausted when such a procedure is organised by law.45 When the law does not provide for any preliminary administrative review, the taxpayer may submit its case directly to the tribunal.46 For example, if the taxpayer fears the threat of an illegal assessment, it may protest to the tribunal, and request urgent and preliminary measures to avoid further damage.

In general, the Treasury is represented by the tax director who decided on the complaint, or his or her delegate. In specific circumstances, the Treasury appoints attorneys-at-law, which may mean additional costs for the unsuccessful taxpayer (see Section VI).

The parties usually submit a schedule to the court stating the date on which they will file their briefs of arguments and request a date for the oral submissions. Because the tax courts are under-resourced, hearings are severely delayed.

The ordinary rules allow the taxpayer to present new claims in its brief of arguments, provided that they are supported by the facts stated in the initial petition. If the taxpayer has extensively described the facts in its petition, it may use them as the basis for grievances that were not submitted at the time of filing the original petition but that have since become apparent to the taxpayer on reviewing the tax authorities' arguments and supporting documents.

The tribunal decides on the merits of the case, having regard to the formal and substantive aspects of the assessment. Because tax law is a matter of public policy, the tribunal must decide not only on the basis of the grounds alleged by the parties, but also on the grounds that it finds relevant. The tribunal is not bound by the brief of arguments of the parties, but it cannot grant a party more than has been claimed.

The tribunal's decision may be contested before the court of appeals. Appeals must be lodged within one month after the contested judgment has been served by a bailiff.47

If the tribunal decides to annul the tax bill wholly or partly for a reason other than the statute of limitations, the case remains pending before the court for an additional six-month period, during which the tax authorities may submit an alternative assessment based on all or part of the same elements as the annulled tax to the tribunal. In such cases, the parties' right to appeal against the tribunal's decision is suspended. If the tax authorities submit an alternative assessment, the deadline to lodge an appeal against the tribunal's decision starts running from the time the decision on the alternative assessment is served (Article 356 CIR1992).48 However, a taxpayer may lodge an appeal before the end of the six-month waiting period and it will be admissible.49 The alternative assessment is allowed to the tax authorities provided that the court did not decide on the statute of limitation or the taxable basis when dismissing the case of the tax authorities.50

The tax authorities are not allowed to submit an alternative assessment if the tax director fails to decide on the complaint before the taxpayer brings the case before the tribunal.

ii Right to appeal

The court of appeal has full jurisdiction and it must revisit the case. The procedural steps are the same as those before the tribunal.

Unless the First President of the court of appeal decides otherwise in specific circumstances, the taxpayer is heard by a single judge.

The tribunal's decision is suspended during the appeal procedure and the period during which an appeal can be lodged (Article 377 CIR1992).

iii Appeal on a point of law

The court of appeal decision may be challenged before the Supreme Court, but only on the grounds that the decision would be in conflict with the law or that it would infringe an essential procedural requirement. In order to leave little room for discussion before the Supreme Court, courts of appeal prefer to reason their opinion on the basis of their finding of the facts.

If the Supreme Court quashes the court of appeal decision, the case will be submitted to another court of appeal or another chamber of the same court of appeal, which will have jurisdiction only to the extent to which the dictum of the earlier decision has been invalidated and the court of appeal to which the case is referred must settle the case in line with the Supreme Court's dictum.51

iv Preliminary rulings

Tribunals, courts of appeals and the Supreme Court may refer tax issues for a preliminary ruling before the Constitutional Court or the ECJ.

Penalties and remedies

i Administrative penalties

Any understatement of income tax as well as any infringement to transfer pricing reporting obligations may give rise to administrative fines of up to €1,250 being imposed by the tax authorities. A fine of €12,500 applies in case of bad faith or wilful conduct and the same amount may be doubled if the taxpayer reoffends. A flat penalty of €6,250 applies if the taxpayer omits to report information relating to the 'Cayman Tax' (Article 445 CIR1992).

If income of at least €2,500 is not reported, the tax authorities may also impose proportional surtaxes depending on the type of infringement, and increasing in the event of repetition (Article 444 CIR1992). The surtaxes range from 10 per cent to 200 per cent. An infringement is repeated only if notice of a first infringement has already been given before the subsequent infringement is committed (Article 229 AR/CIR92). If the taxpayer correctly files four returns in a row, previous infringements are ignored (Articles 227 and 228 AR/CIR92). The aggregate amount of tax and surtaxes cannot exceed the amount of unreported income (Article 444 CIR1992).52 The tax authorities must restate the facts that justify the penalty, its legal ground and the justification of the amount of the penalty.53

In certain circumstances, a specific tax rate (100 per cent) applies to hidden earnings and insufficiently documented expenses made by companies and not-for-profit organisations ('secret fees') (Articles 219, 225, 246 and 247 CIR1992).

ii Criminal penalties

In addition to administrative penalties, the law also provides for criminal penalties, which are applied by the courts. Besides imprisonment, a taxpayer who has committed fraud or forgery may be sentenced to a fine of up to €500,000 (Articles 449 and 450 CIR1992). The amount of the fine to which the taxpayer is sentenced is multiplied by eight (Article 457 CIR1992).54

Tax claims

i Recovering overpaid tax

Refund of taxes and interest

Withholding tax on movable property income or professional income and early payments of tax are creditable against the final tax calculated upon assessment, and the excess is refundable. The final tax should be assessed by 30 June of the year following the assessment year or six months after the timely filing of the tax return. If the tax bill announces a refund, interest accrues in favour of the taxpayer from the third month after the period of limitations on assessment has run until the date of payment (Articles 359, 353 and 419 CIR1992). With respect to tax bills issued since 1 January 2018, interest accrues from the month commencing after the taxpayer has served a summons to the tax authorities (Article 418 CIR1992). In certain circumstances, refundable amounts are credited against other outstanding amounts instead of being paid in cash. Refundable amounts may also be used to offset tax liabilities other than income tax, unless such other taxes are contested. When a taxpayer is allowed a refund of taxes, this refund may also be used by the authorities to offset debts of the same taxpayer with regard to social security authorities or other Belgian governmental bodies (Article 334 of the Law of 27 December 2004).

With respect to withholding tax, the beneficiary of the income and the debtor are entitled to claim a refund of the withholding tax in the absence of a timely assessment, or if the tax was unduly withheld (Com CIR92, 366/3).55 Unless the tax authorities have made use of the contested withholding tax to offset a tax debt, the period allowed to the taxpayer to claim the refund of unduly paid withholding tax is five years from 1 January of the year during which the withholding was paid to the Treasury (Article 368 CIR1992). If the claim for a refund is filed by the beneficiary of the income, interest accrues in its favour. However, if the debtor of the income claims the refund of the tax that it spontaneously withheld at source, no interest accrues (Article 419 CIR1992).56 In specific circumstances, the law excludes interest accrual on refundable amounts. Nevertheless, interest should accrue where withholding tax has not been credited as a result of a mistake by the tax authorities, such as a delay in the assessment of final tax.57

Interest is calculated at the legal rate on the amount of overpayment. This rate was 7 per cent until December 2017 (Act of 5 May 1865 on interest-bearing loans). Since January 2018, the rate has been 2 per cent (Article 418 CIR1992).

ii Challenging administrative decisions

The Belgian Constitution provides that a tax can only be levied and exemption can only be granted by an act of parliament ('no taxation without representation'). The Constitutional Court has repeatedly held that the power to decide on the principle of a tax and its essential elements belongs to the legislature.58

Therefore, the tax authorities and the courts are not allowed to relieve a taxpayer of its liability as stated by the law. As a consequence, an agreement between the tax authorities and the taxpayer cannot be binding if it settles a legal issue. A taxpayer cannot rely on its legitimate expectations if its understanding of its tax situation deviates from the law. Even bona fide does not help.59

However, a taxpayer may invoke a rule that supersedes an act, such as the Constitution, European legislation and the European Court of Human Rights (ECHR). A taxpayer may even claim the annulment of an act that conflicts with the Constitution before the Constitutional Court within six months of the official publication of the act.

Ordinary courts and tribunals are willing to discuss the compliance of a Belgian act with superior international rules and to set aside a non-complying act. Belgian judges do not always refer such cases to the ECJ, and decide themselves whether a contested Belgian provision complies with EU law.60 However, they are often reluctant to decide on the compliance of an act with the Constitution, and they must refer the issue to the Constitutional Court before setting aside the application of a legal provision on the ground that it is conflicting with the Constitution.61

When a Belgian tax provision is held to be contrary to a superior rule by the Constitutional Court or the ECJ, the tax authorities defer to the case law before the contested provision is amended by the legislature, and even invite the taxpayers to behave as if such a provision had been amended.62

iii Claimants

Tax complaints and appeals must be filed by the taxpayer on whom the tax is imposed.63 A tax imposed on a taxpayer cannot be challenged by another person, unless that person has succeeded to the rights and liabilities of the taxpayer. For example, in the case of a merger or a split-up, the company that inherits the liabilities of the absorbed or split company is entitled to file a complaint or an appeal against the tax bill assessed in the name of the latter. A company validly acts through its directors or managers appointed according to company law.

If a company is wound up, the person appointed as a liquidator is entitled to act in this capacity.64 The liquidator is also allowed to file a complaint in the name of the company whose liquidation is closed. Bankrupt companies are validly represented by the administrator in the insolvency.

A proxy holder may file a complaint in the name of a taxpayer. Tax consultants may act as proxy holders when filing a complaint, but they are not authorised to represent their customers before the courts. The tax authorities acknowledge that attorneys-at-law represent their clients when filing a complaint, as well as before the courts, and do not need to prove it (ComIR92, 366/9).65


i Duty for listing a case

Since 1 February 2019, a tax on filing a petition or a further appeal applies if the amount in dispute exceeds €250,000. Besides, depending on the court, a minimal fee (of about €25) applies.

ii Indemnities

As a reaction to the Supreme Court holding that the winner of a case brought before a court might also obtain damages corresponding to the cost of the assistance of an attorney in certain situations,66 the legislature has provided that a fixed indemnity is due to the winner from the defeated party, to wholly or partly cover the fees due from the winner to its attorney; this prevents the winner from requesting indemnities in excess of the legally fixed amount (Article 1022 of the Judicial Code).

This legal indemnity is liquidated by the court on the basis of tables. The regular indemnity ranges from €180 to €18,000 when the amount at stake is at least €1 million.

The indemnity is only due when the winner has hired an attorney to assist him or her before the court. The tax authorities are also liable for indemnities when they lose their cases.67

Alternative dispute resolution

i Advance rulings

The Act of 24 December 2002 has organised the current 'advance ruling' procedure. This procedure seems to meet the expectations of numerous taxpayers.

The federal tax authorities release advance rulings on any question relating to a tax they are in charge of, except questions relating to collection or proceedings. As a rule, the tax authorities cannot deliver a ruling regarding transactions with a low-tax country that does not cooperate according to the standards of the Organisation for Economic Co-operation and Development (OECD), or transactions that have no economic substance in Belgium.

An advance ruling is a legal act by which the tax authorities determine how the legislation in force will apply to a situation or a transaction that has not yet triggered fiscal consequences. The Ruling Commission may therefore not intrude in tax disputes.

Advance rulings are effective for five years unless the taxpayer demonstrates that a longer validity period is appropriate. In addition, the ruling is cancelled when the requirements that it states are not satisfied, when the taxpayer has not provided an accurate description of the envisaged situation, when the legislation on which the ruling relied (including Belgian and EU law and treaties) is modified, or when it appears that the ruling conflicts with Belgian, EU law or treaties. In this respect, a memorandum has been concluded between the services of the tax authorities to ensure that the tax inspectors would not challenge the legality of an advance ruling.

The Ruling Commission allows taxpayers (represented by a counsel) to file a preliminary request on a no-name basis. If it finds that it may satisfy the taxpayer's request, it invites the taxpayer to file a formal request. If it considers that it cannot satisfy the taxpayer, the taxpayer will simply not continue the procedure.

The cost of such a procedure mainly depends on the fees requested by tax counsels to assist clients, because the tax authorities are not allowed to charge fees to taxpayers.

ii Tax Conciliation Service

The Act of 25 April 2007 created the Tax Conciliation Service (TCS) to serve as an interface between taxpayers and the federal tax authorities. The TCS has been operating since 2010. Although it belongs to the tax authorities, it is independent from other services. By the same token, it has no authority to give instructions to other services. It may decline a request for conciliation.

The TCS acknowledges receipt of requests filed in writing (even by email) or orally. Even when the TCS cannot satisfy the taxpayer's expectations, its report on a case can be useful as supporting documentation before a court.

iii International mutual agreement or arbitration procedures

The tax authorities request the taxpayers to withdraw their petitions or appeals before entering a mutual agreement with foreign authorities.

Belgium signed the multilateral instrument (MLI) in June 2017 and ratified it in June 2019.68 Belgium adopted its arbitration provision. Belgium prefers the 'Baseball' procedure but remains open to a reasoned opinion procedure.


According to the Constitution, no tax can be levied unless the legislature so provides. A taxpayer may choose to organise its transactions in a manner that triggers little taxation. The taxpayer must, however, accept all the consequences of its acts. The tax authorities must set aside disguised transactions and adhere to the legal reality created by the taxpayers.69 Sham is a fraud.

The tax authorities may also ignore transactions conducted by a taxpayer that infringe a non-tax legal provision of public policy if its intent is to defeat or evade tax.70 However, the tax authorities cannot rely on the economic reality or the concept of abuse of law to adjust the situation of a taxpayer.

The Act of 29 March 2012 introduced the concept of 'tax abuse' in Article 344/1 CIR1992. The tax authorities may disregard the legal act or a series of legal acts composing the same transaction if the tax authorities demonstrate by presumptions (or otherwise) and in the light of objective circumstances that tax abuse has been committed.

There is tax abuse when the taxpayer realises by its legal act or series of legal acts, one of the following transactions:

  1. a transaction allowing it to escape the application of a provision of the Income Tax Code or the decrees implementing that code, in violation of the goals of such a provision; or
  2. a transaction allowing it to claim a tax benefit provided by a provision of the Income Tax Code or the decrees implementing that code, while the grant of such a benefit would be conflicting with the goals of such a provision and the main purpose of that transaction is the grant of such a benefit.

The onus is on the taxpayer to demonstrate that the choice of this legal act or series of legal acts is justified by motives other than the avoidance of income tax.

If the taxpayer does not provide any evidence to the contrary, the taxable base and the computation of the tax are restored in such a manner that the transaction is subject to a levy complying with the goals of the law, as if the abuse never took place.

The Constitutional Court has held that this provision does not conflict with the constitutional principle according to which no tax can be levied in the absence of clear legislation. The Constitutional Court held that this provision only relates to the burden and administration of evidence in tax matters and does not affect the basis and the rate of taxes. The tax authorities must demonstrate the purpose of the legislature when asserting that a taxpayer acted in a manner that they view as an abuse.71

Belgium implemented the Anti-Tax Avoidance Directive (ATAD). It considered that Article 344(1) CIR1992 did not need to be modified to comply with the ATAD. It implemented other provisions of the ATAD, although such implementation may overlap pre-existing domestic provisions, such as the controlled foreign corporations (CFC) rules.

Double taxation treaties

Belgium has concluded around 100 double taxation treaties. Belgian-resident taxpayers may initiate in Belgium the mutual agreement procedure provided by double taxation treaties, and rely on the assistance of the central tax authorities to challenge a foreign tax at source. The outcome of such a procedure is, however, dependent on the best efforts of both the Belgian and the source country's authorities.

When interpreting a double taxation treaty, the Belgian tax authorities rely on the OECD Commentary on the Model, unless Belgium has made reservations on the Model or its Commentary. The Belgian tax authorities use the ambulatory method of interpretation. They even refer to the latest version of the OECD Commentary when it can be reconciled with the text of the relevant treaty and specific commentaries made on this treaty.

Because the text supersedes teleological interpretation, the preamble imposed by the MLI is not expected to modify the interpretation of technical provisions included in pre-existing treaties.

The Belgian tax authorities even agree that the interpretation of undefined terms used in treaties must be found in the source country's legislation when deciding whether income has been taxed abroad according to the treaty. However, they use Belgian definitions when determining which method of elimination of double taxation must be used in Belgium (Article 23(A) of the OECD Model Tax Treaty, Article 22 of the Belgian standard treaty).72

Areas of focus

The amount of income added to the taxable basis of a corporate taxpayer further to a notice of deficiency giving rise to a 10 per cent penalty cannot be offset by deductions ordinarily available such as carried over losses, etc. (Article 207 CIR1992). This rule may impact the manner in which the tax authorities apply penalties.

Outlook and conclusions

The current tax procedure is the result of a reform specific to the tax procedure in 1999 and an ongoing reform of the judicial procedure commenced in 2007.73 Those reforms were intended to speed up the process, but delays remain considerable. Reasons for such delays include a shortage of judges, the recent reform of the courts' structures and the length of time required by the central tax authorities to issue clear instructions to tax inspectors.


1 Caroline P Docclo is of counsel at Loyens & Loeff.

2 The collection of taxes by the regions is subject to regional legislation.

3 Income tax returns must be filed within the six-month period following the closing of the relevant period. The calendar year is the relevant period for determining liability for individual tax. The fiscal year to which the annual financial statements of companies and other separate legal entities relate corresponds to the period over which their liability to corporate tax or to not-for-profit organisation tax is determined.

4 Corporate taxpayers are expected to verify the deadline for filing their tax return in the website of the Treasury, although there is no legal provision that imposes that rule.

5 The Law of July 2017 inserted the rule in the Code as if it were an interpretative provision. However, the Supreme Court decided that under the old law, surtaxes did not apply in case the tax return was merely late (Cass., 15 March 2018).

6 The minutes of a VAT audit may be used to make presumptions for income tax purposes (see Cass., 21 June 2012).

7 The assessment year is the year during which the tax situation of the taxpayer is determined. This is the current calendar year with respect to withholding taxes; the year following the relevant period with respect to individual tax; and the year during which the fiscal year ends if it ends before 31 December, or the year thereafter if the fiscal year ends on 31 December.

8 Cass., 20 May 2016.

9 Cass., 12 February 2016.

10 Cass., 8 May 2009; Cass., 7 April 2016.

11 For the purposes of the 'Cayman Tax', the tax authorities may investigate for 10 years (Article 333 and 354 CIR1992).

12 Seven years in case of wilful attempts to defeat or evade tax.

13 Cont. Court, 12 October 2017.

14 As an exception to this rule, information collected in a bank's books on the occasion of that bank's tax situation being examined must not be used to tax that bank's customers, unless a fraud mechanism is detected (Article 318 CIR1992).

15 Cass., 22 May 2015; Cass., 4 November 2016; Cass., 10 February 2017; Cass., 18 January 2018.

16 There is no threshold amount or de minimis rule. The tax authorities may adjust the taxpayer's tax situation even if no supplement of tax is at stake for the period under examination (e.g., adjustment of operating losses or excess dividends-received deduction available for carry-forward).

17 A mere unsigned note is not akin to a notification of assessment (Cass., 5 January 2017).

18 See Cass., 21 November 2013.

19 See Cass., 18 October 2012.

20 The tax authorities are not requested to demonstrate that the tax return is not correct (Cass., 20 February 2014; Cass., 2 December 2016).

21 A tax that is computed on the basis of the tax return must be assessed according to Article 353 CIR1992 even if the authorities later determine a deficiency within the time limit of Article 354 CIR1992 (Cass., 17 November 2016).

22 The tax authorities are allowed a 10-year period to assess the 'Cayman Tax' in a number of circumstances.

23 Cass., 12 February 2016; Cass., 21 September 2017.

24 If a taxpayer liable for corporate tax is dissolved and its directors, managers or liquidators do not reserve the moneys to satisfy the Treasury, they may be sued for five years after the publication of the closing of the liquidation.

25 Cass., 17 November 2016.

26 The time extension is not subject to investigations with third persons (Cass., 17 June 2016). Withholding tax may also be assessed during 10 years in certain circumstances (Article 354 CIR1992)

27 The Supreme Court held that the same provision allowed the tax authorities to tax, during the additional 12-month period, income that has not been reported after the commencement of the proceeding (Cass., 17 October 2013). It also held that a decision to discontinue prosecutions is not a decision ending the procedure in the meaning of Article 358 CIR1992 (Cass., 23 February 2018).

28 The principle that items of income earned during a given period must be taxed separately with the other income of the same period is set aside by Article 361 CIR1992 (Const. Court, 124/2011, 7 July 2011).

29 Cass., 12 September 1991.

30 See also Cass., 22 September 2011; Cass., 2 March 2017.

31 Cass., 9 February 2018.

32 Cass., 21 September 2012.

33 Cass., 11 May 1965.

34 Cass., 29 September 2017.

35 A tax on tax may be viewed as double taxation (Cass., 2 January 2017).

36 See Cass., 19 January 2012.

37 Cass., 10 March 2016.

38 A decision of the Council of State cannot justify a rescission (Cass., 21 December 2017).

39 Const. Court, 54/2005, 8 March 2005.

40 The Minister of Finance may make a general decision on all tax complaints based on a conflict of a provision of the CIR1992 with the Constitution if the Constitutional Court dismisses a request for annulment of that provision. The decision of the Minister is gazetted (Article 376bis CIR1992).

41 Cass., 11 May 2018.

42 Cass., 21 September 2012.

43 Cass., 31 January 2014.

44 Tax cases are not necessarily referred to public prosecution.

45 Cass., 25 January 2018; see, however, ECJ 8 March 2001, Metalgesellschaft, Hoechst (C-397/98).

46 See Cass., 9 February 2018; see also Cass., 5 May 2018.

47 An appeal against a decision to which the taxpayer previously bowed is not admissible, even if the decision has never been served (Cass., 30 June 2016).

48 The alternative tax may be linked to an assessment year other than the assessment year to which the annulled tax was related (Cass., 17 October 2013).

49 Cass., 30 March 2017.

50 Cass., 5 May 2017.

51 Fundamental reforms named 'Pot-Pourri'.

52 The Constitutional Court held that the judge must be allowed to give conditional sentences (Const. Court, 55/2014, 27 March 2014).

53 Cass., 19 October 2012.

54 These penalties are applicable to offences committed since November 2012. Offences committed before November 2012 could result in imprisonment and fines of up to €125,000; the amount of these fines cannot be multiplied (old Article 457 CIR1992).

55 The complaint against a tax unduly withheld is admissible even if the taxpayer does not report the income in its tax return (Cass., 14 January 2016).

56 See Cass., 24 October 1996.

57 Const. Court, 24/2008, 21 February 2008.

58 Const. Court, 72/2005, 20 April 2005; 32/2007, 21 February 2007.

59 Cass., 14 June 1999; Cass., 20 November 2006.

60 Even the Constitutional Court refused to submit to the ECJ the issue of the euro-compatibility of the fiscal deduction of antitrust fines imposed by the European Commission (Const. Court, 161/2012, 20 December 2012).

61 See Cass., 17 May 2010.

62 On the issue whether an alternative rule may replace an invalidated legal provision, see Cass., 4 September 2015.

63 However, tax claims and appeals against withholding taxes may be filed either by the taxpayer that earned the income on which the tax has been unduly withheld or by the debtor of income that unduly withheld taxes on such income.

64 Since the act of 2 May 2019, the tax on the profits of a wound-up company is assessed under the name of the liquidator (Article 357 CIR1997; see also Circular 2019/C/122 of 18 November 2019).

65 See, however, Cass., 12 February 2016.

66 Cass., 2 September 2004, 5 May 2006, 16 November 2006 and 28 March 2007.

67 Const. Court, 68/2015, 69/2015, 70/2015, 21 May 2015.

68 See P. De Vos, C. Docclo, IFA report (2020 congress),

69 Cass., Brepols, 6 June 1961; 29 January 1988; 22 March 1990; 4 January 1991.

70 Cass., 5 March 1999; 16 October 2009.

71 Const. Court, 141/2013, 30 October 2013.

72 Circular No. AAF/2004/0053 (AAF 5/2004), 16 January 2004.

73 And continued by Pot-Pourri.

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