US tax guide for Americans living in Belgium (2026 update)
Americans living in Belgium must file a US federal tax return annually – the US taxes citizens on worldwide income regardless of residence. Taxes in Belgium for foreigners or US expats include Belgian government assessments and US reporting obligations. Belgium’s top federal income tax rate is 50% on taxable income above €49,840 for the income year 2025 (assessment 2026).
Belgium uses a progressive system (25%, 40%, 45%, 50%) with a basic personal tax allowance of €10,910 (IY2025). Municipal surtaxes (0–9%) are added separately. US citizens must understand that taxes in Belgium are assessed on worldwide income, which interacts with US federal reporting obligations, and therefore should know the complete list of US tax forms for expats in 2026.
Three IRS mechanisms reduce US tax liability for Americans in Belgium:
- Foreign Earned Income Exclusion. This exclusion allows one to exclude earned income from foreign sources.
- Foreign Tax Credit (FTC) allows tax on remaining income to be reduced based on the taxes paid to foreign governments.
- Foreign Housing Exclusion allows additional exclusions from their income for some amounts paid to cover household expenses due to living abroad.
Quick reference: Key figures for US expats in Belgium (2026)
The table below provides the primary thresholds and deadlines every American in Belgium needs for tax years 2025 and 2026.
| Topic | 2025 income tax year | 2026 income tax year |
|---|---|---|
| FEIE exclusion | $130,000 | $132,900 |
| Belgian top income tax rate | 50% (above €49,840) | 50% (above €51,070) |
| Tax–free allowance | €10,910 | €11,180 |
| US–Belgium tax treaty | In force (2009 Protocol) | In force |
| FBAR filing threshold | $10,000 (aggregate) | $10,000 (aggregate) |
| US return deadline (abroad) | June 15, 2026 | June 15, 2027 |
Sources: Belgian FPS Finance (FOD Financiën)
US–Belgium tax treaty
The United States and Belgium income tax treaty (updated by the 2009 Protocol) allocates taxing rights on wages, pensions, dividends, interest, and royalties. The treaty prevents double taxation for US citizens residing in Belgium and covers Article 15 (employment income), Article 17 (pensions), and Articles 10–12 (investment income).
There are several tax treaties that Belgium has with other nations, and those include the United States. The latest tax treaty between Belgium and the US was updated by the 2009 Protocol (US Senate Treaty Doc. 111–6, in force 28 December 2009). The primary purpose of the treaty provisions is to help taxpayers in both countries avoid paying taxes on the same income in both locations.
The provisions make clear which country gets the taxes on each particular kind of income situation. There are additionally many provisions that give guidance to companies conducting business in other countries regarding the taxation they are subject to, and this includes the US–Belgium tax treaty documents.
Belgian income tax rates and brackets
Belgium applies four progressive federal income tax brackets for the income year 2025. The four progressive Belgium tax bands show how taxable income is split and taxed incrementally.
Comparing tax brackets Belgium year-over-year highlights changes in thresholds and marginal rates for expats. The top Belgium tax rate of 50% applies to taxable income above €49,840. A tax–free allowance of €10,910 reduces effective rates for all residents. Belgium tax rates are structured so that higher incomes pay progressively more, and municipal surtaxes apply on top of federal tax.
Belgian income tax brackets: Income year 2025 vs income year 2026
The table below compares Belgium tax bands for income year 2025 (assessment year 2026) and income year 2026 (assessment year 2027).
| Tax rate | Taxable Income IY 2025 (AY 2026) | Taxable Income IY 2026 (AY 2027) |
|---|---|---|
| 25% | €0 to €16,320 | €0–€16,720 |
| 40% | €16,320 to €28,800 | €16,721–€29,510 |
| 45% | €28,800 to €49,840 | €29,511–€51,070 |
| 50% | above €49,840 | above €51,070 |
Understanding Belgium's tax bands is essential for correctly applying deductions and credits.
- Tax–free allowance (IY 2025): €10,910.
- Municipal surtax: 0%–9% levied on top of federal tax, varying by commune.
Reviewing the historical and current Belgium tax rates helps expats plan their US and Belgian filings efficiently.
Source: Belgian FPS Finance (FOD Financiën), thresholds updated annually.
Municipal surtax in Belgium
Belgian municipalities apply a supplemental surtax (centimes additionnels / opcentiemen) of 0–9% on the federal tax due; for high incomes, combined rates can effectively exceed 50%, but the exact effective rate varies by commune and personal circumstances. This means a Brussels resident in the 50% federal bracket faces an effective combined rate of approximately 53.5% (50% federal × 1.07 municipal).
Municipal surtaxes add a layer to tax brackets in Belgium, increasing the effective rate for higher incomes. Also, effective combined Belgium tax rates, including local surtaxes, often exceed US federal rates for high earners.
Belgian tax rate vs US tax rate
For many expats, the Foreign Tax Credit (Form 1116) often offsets US tax more fully than the Foreign Earned Income Exclusion (Form 2555), especially where foreign tax rates are high.
The optimal choice depends on the individual income mix. Belgium tax systems often mean effective combined tax rates reach 53–54% for income above €49,840, which exceeds US federal rates. Applying the FTC on Form 1116 typically reduces US federal tax liability to $0, while the FEIE would leave some income exposed to US tax at the margin.
Living and moving to Belgium as an American
Americans moving to Belgium become Belgian tax residents once they register with their local commune (municipality). Non–EU citizens, including US citizens, must present themselves to the commune within 8 working days of arrival in Belgium and provide a valid D–visa and passport. Living in Belgium as an American means meeting Belgian tax registration requirements while keeping up with US filing obligations.
Proper planning ensures that taxes in Belgium on earned income, housing, and investments are minimized using IRS mechanisms like the FEIE and FTC.
Registering with the commune triggers Belgian tax residency. US filing obligations continue – you must file a US Form 1040 annually, regardless of Belgian residency.
Moving to Belgium from the US: tax registration steps
Americans relocating to Belgium must complete the following 6 steps to establish tax residency and comply with both Belgian and US filing obligations:
- Register with your local Belgian commune (foreigners department) within 8 working days of arrival – bring a valid D–visa and passport.
- Obtain a Belgian residence permit (Annex 15 for non–EU nationals) after commune registration.
- Receive your Belgian National Register Number (NRNN) – required for filing the annual Belgian income tax return.
- Notify the IRS of your foreign address by updating Form 8822 (Change of Address).
- File your first Belgian income tax return (aangifte / déclaration) online via MyMinfin for the income earned in Belgium during the year of arrival.
- Continue filing US Form 1040 annually – Belgian residency does not eliminate or reduce the US filing obligation.
This list captures the essentials for moving to Belgium from the US.
Retiring to Belgium as a US citizen
US citizens retiring to Belgium pay US income tax but not Belgian income tax on US Social Security benefits – Article 17 of the US–Belgium tax treaty assigns exclusive taxing rights over US Social Security payments to the United States. Private pension distributions and IRA withdrawals are generally taxable in both Belgium and the US, with the Foreign Tax Credit (Form 1116) used to offset double taxation on the same income.
Retiring to Belgium scenarios often involve careful planning around cross–border pensions and benefits. Awareness of Belgium tax rates is especially important for retirees managing Social Security, pensions, and investment income.
US tax obligations for Americans in Belgium
US citizens in Belgium must report worldwide income to the IRS annually, regardless of Belgian tax paid. Three mechanisms limit double taxation:
- the Foreign Earned Income Exclusion (FEIE),
- the Foreign Tax Credit (FTC), and
- the Foreign Housing Exclusion.
Filing accurately prevents penalties and ensures compliance with both taxes in Belgium and US taxation rules. The IRS provides three mechanisms to reduce US tax liability on income earned in Belgium:
Foreign Earned Income Exclusion (FEIE)
The Foreign Earned Income Exclusion for tax year 2025 is $130,000 per qualifying US person; for tax year 2026, the limit increases to $132,900. US citizens in Belgium who satisfy the Bona Fide Residence Test or Physical Presence Test (330–day rule) claim the FEIE on Form 2555. The base housing amount (2025) is $20,800 (16% of $130,000); the general housing limit (30% of the FEIE) is $39,000 for 2025 and $39,870 for 2026.
Even when using the FEIE or FTC, US expats must be aware of Belgium tax bands for their local filings, and they must learn to calculate the FEIE exclusion for 2025.
Foreign Tax Credit (FTC)
The Foreign Tax Credit allows US expats to reduce their US tax liability dollar–for–dollar by Belgian income taxes paid, claimed on Form 1116.
Because Belgian combined rates (federal + municipal) reach 53–54% for high earners – exceeding US federal rates – most Americans in Belgium eliminate their US tax liability entirely through the FTC.
Belgian special expat tax regime (BBIB/BBIO)
The Belgian Special Tax Regime for Inpatriate Taxpayers (BBIB) provides qualifying foreign executives with a tax–free cost allowance equal to 35% of gross remuneration, with no upper ceiling. Effective 1 January 2025, the minimum gross salary threshold was reduced from €75,000 to €70,000 annually. BBIB is a cornerstone of the Belgium expat tax regime for high–skilled foreign workers.
BBIB eligibility requirements
Executives must meet the following 4 conditions to qualify for the BBIB special regime:
- Minimum gross annual remuneration of €70,000 (reduced from €75,000 effective 1 January 2025).
- Must not have been a Belgian tax resident or worked in Belgium in the 60 months preceding arrival.
- Application submitted within 3 months of starting Belgian employment – no retroactive submissions accepted after the BBIB application deadline.
- Regime applies for 5 years, renewable once for a maximum total of 10 years.
BBIB and US taxes: key interaction
The BBIB 35% cost allowance is tax–exempt under Belgian law but is generally treated as US–taxable income because the IRS does not recognise Belgian domestic tax exemptions. US executives under BBIB typically use the Foreign Tax Credit on Form 1116 to offset US tax on income not covered by the Belgian exemption.
That is because Belgian taxes on the remaining 65% of remuneration often exceed US tax on the full gross amount, most BBIB participants reduce their US liability to $0 through the FTC.
New Belgian capital gains tax (2026)
Belgium introduced a 10% capital gains tax on financial assets effective 1 January 2026. The tax applies to gains on assets (stocks, bonds, investment funds) acquired after 31 December 2025. An annual exemption of €10,000 per taxpayer applies. Assets held before 1 January 2026 are exempt from gains accrued up to that date.
US citizens holding Belgian investment accounts must report Belgian capital gains on Form 1040 regardless of Belgian treatment. This also includes how foreign dividends are taxed on a US return, which may impact overall US taxable income.
The 10% Belgian capital gains tax qualifies for the Foreign Tax Credit on Form 1116 (passive category income), reducing US tax liability on the same gains. Special regimes like BBIB or the Belgium capital gains tax 2026 affect taxation in Belgium for expatriates.
FBAR and FATCA for Americans in Belgium
Americans in Belgium must file FinCEN Form 114 (FBAR) for any calendar year in which aggregate foreign financial accounts exceed $10,000 at any point. The 2026 FBAR deadline is April 15, with an automatic extension to October 15.
Non–willful violations carry a penalty of up to $16,536 per FBAR report under the Supreme Court’s Bittner v. United States (2023) ruling. Willful penalties remain the greater of $165,353 or 50% of the unreported account balance per account, per year. US expats can file electronically at the FinCEN BSA E–Filing System.
Social Security and the US–Belgium totalization agreement
The US–Belgium Totalization Agreement, in force since 1 July 1984, prevents simultaneous Social Security contributions to both countries. US employees posted to Belgium by a US employer remain under the US Social Security system for up to 5 years; Belgian employees transferred to the US fall under the Belgian system.
US tax filing deadlines for Americans in Belgium
US citizens residing in Belgium on April 15 receive an automatic 2–month extension: the filing deadline is June 15, 2026. Tax owed must still be paid by April 15 to avoid interest charges. Knowing the tax brackets in Belgium helps expats decide whether the FEIE or FTC provides the best US tax outcome.
Americans in Belgium must track two separate filing calendars:
(A) US deadlines
- Federal income tax return (Form 1040) due June 15 (automatic extension).
- Form 4868 extension to October 15 if requested.
- FBAR (FinCEN 114) April 15, auto–extension to October 15.
(B) Belgian deadlines
Annual Belgian income tax return (Belgian authorities) typically filed by late June / early July for the prior income year via MyMinfin.
Conclusion
Key tax facts for Americans in Belgium (2026):
- US citizens in Belgium file Form 1040 annually on worldwide income – Belgian residency does not end US filing obligations.
- FEIE limit: $130,000 (2025) / $132,900 (2026).
- Belgian top rate: 50% federal + up to 9% municipal.
- BBIB special regime: 35% tax–free allowance, €70,000 salary threshold, application within 3 months of hire.
- Capital gains tax: 10% on Belgian financial assets acquired after 31 December 2025.
Americans who move to Belgium mid–year face a split Belgian tax return for the year of arrival and a US return covering worldwide income for the full calendar year. First–year filing – especially when the BBIB regime applies – requires coordination between a Belgian accountant and a US expat tax CPA; errors in the first-year filing coordination often compound for years.
FAQ
The following 12 questions address the most common US tax issues for Americans living in Belgium (including the tax brackets in Belgium), based on IRS rules and Belgian tax law effective for 2025 and 2026.
US citizens and Green Card holders living in Belgium must file a US federal income tax return annually with the IRS, because the United States taxes citizens on worldwide income regardless of country of residence. The automatic filing extension for Americans abroad sets the 2026 deadline at June 15.
Belgium applies four progressive federal income tax brackets for the income year 2025: 25% on taxable income from €0 to €16,320, 40% from €16,320 to €28,800, 45% from €28,800 to €49,840, and 50% above €49,840. A tax-free allowance of €10,910 applies to all residents. Municipal surtaxes of 0%–9% add to the federal rate.
The US-Belgium income tax treaty (updated by the 2009 Protocol) prevents double taxation by allocating taxing rights between the two countries. US expats in Belgium typically apply the Foreign Tax Credit on Form 1116 to offset US federal tax liability with Belgian income taxes paid – since Belgian rates reach 50%+, US liability is usually reduced to $0.
The Foreign Earned Income Exclusion limit for tax year 2025 is $130,000 per qualifying US person; for tax year 2026, the limit increases to $132,900. US citizens in Belgium who satisfy the Bona Fide Residence Test or Physical Presence Test (330 qualifying days) claim the FEIE on Form 2555.
The Belgian BBIB (Special Tax Regime for Inpatriate Taxpayers) provides qualifying foreign executives with a 35% tax-free cost allowance on gross remuneration above €70,000 annually (threshold reduced from €75,000 effective 1 January 2025). The BBIB regime lasts up to 10 years and requires an application within 3 months of starting Belgian employment.
Americans in Belgium must file FinCEN Form 114 (FBAR) for any year in which aggregate foreign financial accounts – including Belgian bank accounts, brokerage accounts, and pension plans – exceed $10,000 at any single point. The 2026 FBAR deadline is April 15, with an automatic extension to October 15. Non-willful violations carry penalties of up to $16,536 per unfiled report.
US Social Security benefits received by a US citizen living in Belgium are generally taxable only in the United States under Article 17(2) of the US–Belgium income tax treaty. The totalization agreement deals with Social Security coverage and contributions, not the income-tax treatment of benefits.
Belgium introduced a 10% capital gains tax on financial assets effective 1 January 2026. The tax applies to gains on stocks, bonds, and investment funds acquired after 31 December 2025, with an annual €10,000 exemption per taxpayer. US expats can apply the 10% Belgian tax as a Foreign Tax Credit on Form 1116 (passive category) to reduce US tax on the same gains.
The Belgian federal income tax applies a tax-free allowance (belastingvrije som) of €10,910 for the income year 2025, reducing the taxable base for all residents. Additional allowances are available for dependent children, single parents, and taxpayers with disabilities. The allowance is adjusted annually for inflation by the Belgian FPS Finance.
Americans living in Belgium on April 15 receive an automatic 2-month extension, making the standard US federal filing deadline June 15 each year (June 16 in 2025). An additional extension to October 15 is available by filing Form 4868. Any US tax owed must be paid by April 15 to avoid IRS underpayment interest.
The US-Belgium Totalization Agreement (in force since 1 July 1984) prevents US citizens from paying Social Security taxes to both countries simultaneously. Employees posted to Belgium by a US employer remain on the US Social Security system for up to 5 years. The agreement also permits combining work credits from both countries to qualify for retirement benefits.
Most Americans in Belgium benefit more from the Foreign Tax Credit over the FEIE because Belgium's combined income tax rate (federal 50% + municipal up to 9%) exceeds US federal rates. Applying the FTC on Form 1116 typically eliminates US tax liability to $0 on Belgian-source income, while the FEIE cannot be applied to the same income as the FTC.
