Tax reform and Pillar Two in Belgium represent two converging forces that are reshaping how multinational enterprises calculate, report and pay corporate tax in the country. Belgium transposed the EU Minimum Tax Directive into domestic law, bringing the global minimum effective tax rate of 15% into force for large groups. At the same time, the Belgian government has pursued a broader corporate tax reform agenda that affects rates, deductions, notional interest and loss-carry rules. This guide covers the Pillar Two framework as it applies in Belgium, the key elements of the wider tax reform, compliance obligations, practical implications for international groups, and the risks of getting it wrong.
Pillar Two is the OECD/G20 framework that establishes a global minimum corporate tax rate of 15% for multinational enterprise groups with consolidated annual revenues of at least EUR 750 million. The mechanism works through a set of interlocking rules - the Income Inclusion Rule (IIR), the Undertaxed Profits Rule (UTPR) and the Qualified Domestic Minimum Top-up Tax (QDMTT) - that together ensure low-taxed profits are topped up to the 15% floor wherever they arise.
Belgium implemented Pillar Two by transposing Council Directive 2022/2523/EU through the Law of 19 December 2023, which entered into force for fiscal years beginning on or after 31 December 2023. The Belgian legislation closely follows the OECD Model Rules and the EU Directive, with limited domestic deviations. The Federal Public Service Finance (FPS Finance) is the competent authority for administration and enforcement.
Belgium introduced a QDMTT, which means that any top-up tax owed on Belgian-source low-taxed profits is collected by Belgium itself rather than by a parent jurisdiction abroad. This is strategically significant: it preserves Belgian tax revenue that would otherwise flow to a foreign parent';s home country under the IIR. Groups with Belgian subsidiaries or permanent establishments that generate an effective tax rate below 15% in Belgium will face a domestic top-up charge before any foreign IIR applies.
A non-obvious requirement is that the QDMTT must qualify as a "Qualified" QDMTT under the OECD peer review process for it to provide a safe harbour against IIR top-up at the parent level. Belgium';s QDMTT has been designed to meet that standard, but groups should verify the current peer review status when structuring their compliance approach.
Belgium';s headline corporate income tax rate is currently 25%, with a reduced rate of 20% available to small and medium-sized enterprises on the first tranche of taxable income. On paper, a 25% headline rate sits well above the 15% Pillar Two floor. In practice, however, the effective tax rate (ETR) for many Belgian entities - particularly those benefiting from the Innovation Income Deduction (IID), the Investment Deduction, or the Notional Interest Deduction (NID) - can fall materially below 25% and, in some cases, below 15%.
The Innovation Income Deduction allows qualifying income from patents and certain other intellectual property to be deducted at up to 85% of the net qualifying income, producing a very low effective rate on that income stream. The NID, which provides a deduction for the cost of equity capital, has been significantly curtailed in recent reforms but continues to apply on an incremental basis. Groups that have structured Belgian IP holding or financing activities around these incentives must now model their Pillar Two ETR carefully.
Under the Pillar Two GloBE rules, the ETR is computed jurisdiction by jurisdiction using a specific formula: adjusted covered taxes divided by GloBE income. This calculation differs from the Belgian statutory tax computation in important respects. Deferred tax assets and liabilities are treated differently, certain taxes are excluded from covered taxes, and substance-based income exclusions (SBIEs) reduce the income base. The SBIEs - which carve out a percentage of payroll costs and tangible asset carrying values - are particularly relevant for Belgian manufacturing or service operations with significant local substance.
In practice, founders and CFOs should consider running a parallel GloBE ETR model alongside the standard Belgian tax return from the outset of each fiscal year, rather than waiting until year-end. A common mistake is assuming that a Belgian entity paying tax at the headline rate is automatically safe from a top-up charge; the GloBE ETR calculation can produce a different result.
Beyond Pillar Two, Belgium has been implementing a multi-year corporate tax reform programme. The reform has several pillars of its own, affecting the tax base, loss utilisation rules, and the treatment of hybrid instruments.
The reform broadened the tax base while reducing the headline rate from its previous level. Loss carry-forward rules were modified: losses can now be carried forward indefinitely but are subject to a basket limitation, meaning that in any given year, only a portion of taxable income above a threshold can be offset by carried-forward losses. This basket rule - set at 70% of taxable income above EUR 1 million - is a significant constraint for groups with large accumulated losses in Belgian entities.
The reform also tightened the rules on interest deduction limitation, aligning Belgium more closely with the EU Anti-Tax Avoidance Directive (ATAD). The earnings stripping rule limits net borrowing costs to the higher of 30% of EBITDA or EUR 3 million. Belgian entities that are heavily debt-financed - for example, acquisition vehicles or intra-group financing companies - must model this limitation carefully, as disallowed interest carries forward but does not carry back.
Hybrid mismatch rules under ATAD 2 have been embedded in Belgian law, targeting arrangements where a payment is deductible in Belgium but not included in income in the recipient jurisdiction, or vice versa. These rules are particularly relevant for Belgian entities involved in cross-border intra-group financing or hybrid instrument structures.
A common mistake made by foreign founders is underestimating the interaction between the basket limitation on losses, the interest deduction cap and the Pillar Two ETR calculation. Each of these rules operates on a different income base and with different timing, so a Belgian entity can simultaneously have a taxable profit for Belgian CIT purposes, a restricted loss offset, a disallowed interest deduction, and a GloBE ETR below 15% - all in the same year.
If you are restructuring a Belgian entity or reviewing an existing structure in light of these reforms, contact info@vlolawfirm.com. We can help structure the setup correctly the first time.
For in-scope groups, Pillar Two compliance in Belgium involves three distinct reporting obligations that operate on different timelines and with different responsible entities.
The GloBE Information Return (GIR) is the primary Pillar Two reporting document. It must be filed by the Ultimate Parent Entity (UPE) or a designated filing entity in its jurisdiction of residence, but Belgian constituent entities must ensure that the Belgian data feeding into the GIR is accurate and complete. The GIR covers jurisdiction-level ETR calculations, top-up tax amounts, and entity-level data. Belgium has adopted the OECD standard GIR format.
The QDMTT return is a separate Belgian domestic filing. Belgian constituent entities of in-scope groups must file a QDMTT return with FPS Finance, reporting the GloBE ETR for Belgian operations and any top-up tax due. The filing deadline aligns with the Belgian corporate income tax return cycle, but groups should confirm the specific deadline with FPS Finance, as transitional provisions may apply for early fiscal years.
The IIR top-up tax applies at the level of the Belgian UPE or intermediate parent entity if it holds low-taxed constituent entities in other jurisdictions. A Belgian parent company of a multinational group must therefore assess not only its own Belgian ETR but also the ETRs of all jurisdictions where it holds subsidiaries, and compute any IIR top-up tax owed in Belgium on those foreign low-taxed profits.
Transitional safe harbours are available for the initial years of Pillar Two. The Transitional CbCR Safe Harbour allows groups to use Country-by-Country Report data to demonstrate that a jurisdiction';s ETR exceeds 15% (or meets other conditions), avoiding a full GloBE computation for that jurisdiction. Belgian entities should assess whether they qualify for this safe harbour, as it significantly reduces compliance burden in the early years.
Penalties for non-compliance with Belgian Pillar Two obligations follow the general Belgian tax penalty framework. Late filing, incorrect returns and underpayment of top-up tax can attract administrative fines and interest charges. The Belgian tax administration has signalled that it will apply the standard penalty regime to Pillar Two from the outset, without a grace period beyond the transitional safe harbours.
Scenario one: Belgian IP holding company. A multinational group holds patents through a Belgian subsidiary that benefits from the Innovation Income Deduction. The subsidiary earns EUR 20 million of qualifying IP income annually and pays Belgian CIT at an effective rate of approximately 4% after applying the IID. Under Pillar Two, the GloBE ETR for the Belgian jurisdiction will be computed on GloBE income, which may differ from the Belgian taxable base, but the low effective rate on IP income is likely to produce a GloBE ETR well below 15%. Belgium';s QDMTT will apply, and the subsidiary will owe a top-up tax to bring the ETR to 15%. The group must decide whether to restructure the IP holding arrangement, accept the top-up cost, or explore whether substance-based income exclusions reduce the GloBE income base sufficiently to raise the ETR above the threshold.
Scenario two: Belgian acquisition vehicle with large carried-forward losses. A private equity group acquired a Belgian operating company through a Belgian holding vehicle. The holding vehicle has significant carried-forward losses from acquisition financing costs. Under the basket limitation, only 70% of taxable income above EUR 1 million can be offset by those losses in any year. The interest deduction cap further limits deductible financing costs. The operating company itself may have a GloBE ETR above 15% due to its normal trading profits and tax payments, but the holding vehicle';s position must be assessed separately. If the group files a consolidated Belgian CIT return (fiscal unity is not available in Belgium in the same form as in some other EU jurisdictions), the interaction between entities must be modelled carefully.
These scenarios illustrate that Pillar Two in Belgium is not a simple overlay on existing tax positions. It requires a fresh, jurisdiction-level analysis using GloBE rules that differ from Belgian domestic tax law in material respects.
Belgium';s tax incentives - particularly the IID and the NID - have historically attracted EU state aid scrutiny. The European Commission has investigated certain Belgian excess profit rulings, and while the current IID regime has been designed to comply with EU law, groups should be aware that the interplay between state aid rules and Pillar Two creates additional complexity. A top-up tax under Pillar Two does not eliminate the risk of a state aid recovery order; both obligations can coexist.
Transfer pricing remains a central compliance area for multinational groups in Belgium. Belgium follows the OECD Transfer Pricing Guidelines and requires contemporaneous documentation for intra-group transactions. The Local File and Master File requirements apply to Belgian entities meeting the relevant thresholds. Importantly, transfer pricing adjustments can affect the GloBE ETR: an upward adjustment to Belgian taxable income increases covered taxes and may raise the ETR above 15%, while a downward adjustment has the opposite effect.
DAC6, the EU mandatory disclosure regime for cross-border tax arrangements, has been transposed into Belgian law. Arrangements that have a main benefit of obtaining a tax advantage and that meet one of the hallmarks - including arrangements involving low-tax jurisdictions or hybrid mismatches - must be reported to FPS Finance. Pillar Two planning arrangements are not automatically exempt from DAC6 reporting, and groups should assess whether restructuring steps taken in response to Pillar Two trigger a disclosure obligation.
A non-obvious requirement is that DAC6 reporting obligations can arise even where the arrangement is fully compliant with Belgian and EU law. The obligation is triggered by the structure of the arrangement, not by whether it is abusive.
What is the threshold for Pillar Two to apply to a Belgian entity, and what if the group is below it?
Pillar Two applies to constituent entities of multinational enterprise groups with consolidated annual revenues of at least EUR 750 million in at least two of the four preceding fiscal years. Belgian entities that are part of groups below this threshold are not subject to the GloBE rules or the Belgian QDMTT. However, they remain subject to all other Belgian corporate tax obligations, including the reformed CIT rules, the interest deduction limitation and the loss basket. Groups near the threshold should monitor their revenue trajectory, as crossing it triggers full Pillar Two compliance obligations from the following fiscal year. Domestic-only groups are also outside the scope of Pillar Two, regardless of size.
How long does it take to prepare a Pillar Two compliance filing in Belgium, and what does it cost?
The timeline depends heavily on the complexity of the group';s Belgian operations and the quality of existing data systems. For a group with a single Belgian entity and straightforward operations, preparing the QDMTT return and the Belgian data for the GIR may take several weeks of professional time. For a group with multiple Belgian entities, IP structures, financing arrangements and significant deferred tax positions, the process can take several months and require specialist GloBE modelling. Professional fees for Pillar Two compliance work in Belgium typically start from the low tens of thousands of EUR for simpler cases and rise significantly for complex structures. Groups should budget for both the initial setup of GloBE data processes and the recurring annual compliance cost.
Can a Belgian entity use the transitional safe harbour to avoid a full GloBE computation?
Yes, if the Belgian jurisdiction qualifies under the Transitional CbCR Safe Harbour. The safe harbour has three tests: a de minimis test based on revenue and income thresholds from the CbCR, a simplified ETR test using a simplified ETR computed from CbCR data, and a routine profits test. If Belgium passes any one of these tests for a given fiscal year, the group can treat the top-up tax for Belgium as zero for that year without performing a full GloBE computation. In practice, many Belgian entities with significant IP income or low-taxed financing structures will not pass the simplified ETR test, and the de minimis test requires very low revenue and income figures. Groups should run the safe harbour tests early in the compliance cycle to determine whether a full GloBE computation is necessary.
Belgium';s implementation of Pillar Two, combined with its ongoing corporate tax reform, creates a layered compliance environment that requires careful analysis for any multinational group with Belgian operations. The QDMTT, the IIR, the loss basket, the interest cap and the DAC6 reporting rules all interact in ways that can produce unexpected tax costs if not modelled in advance. Groups that act early - building GloBE data processes, reviewing Belgian incentive structures and assessing safe harbour eligibility - are best placed to manage their exposure.
VLO Law Firms advises international clients on tax reform and Pillar Two in Belgium. We can assist with GloBE ETR analysis, QDMTT compliance, transfer pricing documentation, DAC6 assessments and broader Belgian corporate tax structuring. To request a consultation, contact: info@vlolawfirm.com