With affordable healthcare, low crime rates, and incredible food scenes, Belgium is an appealing place to live for many Americans moving overseas.
However, moving to Belgium doesn’t mean you no longer need to file U.S. taxes. U.S. citizens and green card holders generally continue filing Form 1040 and reporting worldwide income when they meet filing requirements.
At the same time, becoming a Belgian tax resident can make you subject to Belgian tax on worldwide income. Coordinating the two systems is therefore an important part of managing your finances abroad.
This guide covers major U.S. and Belgian tax considerations for Americans living in Belgium. Because cross-border taxation varies considerably by income, residency status, investments, and employment arrangements, consider the tax professionals at Expat CPA, for advice tailored to your circumstances.
Who Needs to Pay Taxes in Belgium?
Both residents and non-residents need to pay taxes in Belgium, though their obligations are different. Residents pay taxes on their worldwide income, while non-residents only pay income tax on income earned in Belgium.
Determining Belgian Tax Residency
Belgian tax residency generally depends on whether you establish your domicile or center of economic interests in Belgium. If you are registered with your local commune, you are considered a resident for tax purposes. For married couples and legal cohabitants, authorities also consider where the family is located.
Belgian Income Tax Year
Belgium uses a calendar-year income period. Income earned during one calendar year is reported on a Belgian return filed during the following year, which Belgium calls the tax year or assessment year.
Belgian Income Tax Rates and Taxable Income
Belgium has progressive personal income tax rates. For income earned in 2026—including salary, investments, and rental income, the federal brackets are:
- 25% on income up to €16,720
- 40% from €16,720 to €29,510
- 45% from €29,510 to €51,070
- 50% above €51,070
Residents can also owe a municipal surtax calculated as a percentage of federal tax. Rates vary by municipality, generally from 0% to 9%, with approximately 7% being common.
Belgium also provides a basic personal tax allowance. For 2026 income, the basic allowance is €11,180, although personal circumstances may increase it.
Belgian Capital Gains Tax and Investment Income
One of the most significant changes for investors is Belgium’s new capital gains regime. Beginning January 1, 2026, capital gains accrued from that date on qualifying financial assets can fall under a 10% capital gains tax. Financial assets within the regime can include shares, bonds, investment funds, crypto assets, and certain insurance products.
Americans should also review Belgian withholding taxes on dividends and interest. Investment accounts held outside Belgium may create Belgian self-reporting responsibilities even when no Belgian institution withholds the tax.
If you own Belgian rental property, coordinate its Belgian cadastral-income treatment with the actual rental income and expenses reported for U.S. purposes, potentially on Schedule E.
Capital Gains Tax Interaction With U.S. Taxes
Belgian and U.S. capital gains rules do not always calculate taxable gains the same way. A disposal could therefore create different taxable amounts or reporting dates in each country.
Because the Belgian regime generally targets gains accruing from January 1, 2026, maintaining documentation supporting the property’s or investment’s relevant 2026 starting value can be particularly important.
Before making a significant investment sale, consider reviewing both countries’ cost-basis rules and potential foreign tax credits with a cross-border tax professional.
BBIK Special Expat Regime
Belgium offers a special regime for qualifying inbound taxpayers and researchers. Among other requirements, qualifying inbound taxpayers generally must not have been subject to Belgian income tax during the previous 60 months and must previously have lived more than 150 kilometers from the Belgian border. The minimum annual gross remuneration requirement for qualifying inbound taxpayers is now €70,000, although there is no minimum for qualifying researchers.
Applications generally need to be submitted shortly after employment begins, so eligibility should be reviewed immediately when relocating.
The regime now permits qualifying employers to provide up to 35% of gross remuneration as a tax-free cost allowance, with the previous €90,000 annual tax cap removed. These enhancements apply to qualifying remuneration from January 1, 2025.
BBIK Impact on U.S. Taxes and Double Taxation
A Belgian tax exemption does not automatically produce the same result in the United States. BBIK allowances may remain U.S.-taxable compensation unless they qualify for exclusion or reimbursement treatment under U.S. rules.
That difference can reduce the amount of Belgian tax available as a U.S. foreign tax credit. Participants should compare the FTC and Foreign Earned Income Exclusion (FEIE) carefully. If claiming foreign tax credits, Form 1116 may be required.
U.S. Taxes While Living in Belgium
Americans living in Belgium generally continue reporting worldwide income on Form 1040.
Those with qualifying foreign earned income may use Form 2555 to claim the FEIE. Eligibility requires having a foreign tax home and satisfying either the bona fide residence test or the physical presence test. The physical presence test generally requires at least 330 full days abroad during a 12-month period.
For 2026, the maximum FEIE is $132,900 per qualifying taxpayer.
Alternatively, taxpayers may use Form 1116 to claim eligible foreign tax credits. Because Belgian income taxes can be substantial, the FTC may sometimes provide a better result than the FEIE.
Double Taxation Relief and Treaty
The U.S.–Belgium income tax treaty provides rules governing how various types of cross-border income are taxed.
However, Americans should be cautious about the treaty’s saving-clause provisions, which generally preserve the U.S.’s ability to tax its citizens in many situations. Certain treaty-based return positions may also require disclosure on Form 8833.
Foreign Account Reporting: FBAR and FATCA
An American generally must file an FBAR (FinCEN Form 114) if the aggregate value of foreign financial accounts exceeds $10,000 at any point during the calendar year.
Form 8938 is a separate FATCA reporting requirement with higher thresholds. For qualifying taxpayers living abroad, the threshold is generally more than $200,000 at year-end or $300,000 at any time for non-joint filers, and $400,000 or $600,000 respectively for married couples filing jointly.
Belgian pensions and investment accounts should also be reviewed individually because additional U.S. reporting may apply.
Self-Employed Workers and Business Income
Self-employed Americans may need to register their business activity in Belgium, make Belgian social contributions, and register for VAT when applicable.
Business income should generally be included on the Belgian return. It must also be considered for U.S. reporting, often on Schedule C.
Do not assume that paying Belgian social contributions automatically eliminates U.S. self-employment tax. The totalization agreement determines which country’s social security system applies.
Social Security and Totalization Agreement
The U.S.–Belgium Totalization Agreement helps prevent workers from paying social security contributions to both countries on the same earnings.
Generally, self-employed people working only in Belgium fall under the Belgian system. Temporary employee assignments can follow different rules. Employers or workers may need a Certificate of Coverage to document which country’s system applies.
Confirm coverage before beginning an international assignment rather than assuming payroll withholding is correct.
Filing Deadlines, Payments, and Penalties
Belgian resident returns are typically due during the middle of the year. For assessment year 2026, Belgium set June 30 as the paper deadline and July 19 as the general online filing deadline, with a later deadline for certain returns containing specific types of income. Deadlines change annually.
Americans abroad ordinarily receive an automatic extension to June 15 to file their federal return when they meet the overseas requirements. However, interest generally accrues on unpaid federal income tax beginning with the regular April deadline.
Paying estimated U.S. tax by the regular April deadline can therefore help limit interest charges.
Practical Cross-Border Tax Planning Tips
Fulfilling tax obligations in two countries is more manageable when you plan ahead.
Keep records showing your Belgian residency dates, wages, taxes withheld, investments, property, and foreign financial accounts. Compare the FEIE with the FTC rather than automatically choosing one approach each year.
Before selling major investments, review both Belgian and U.S. capital gains exposure. Maintain year-end and maximum account balances for FBAR and FATCA reporting, and preserve documentation for Belgian pension and investment accounts.
Cross-border planning is most effective before a transaction occurs.
Get Professional Help from Expat CPA
Living in Belgium can create overlapping U.S. and Belgian filing requirements, especially when investments, pensions, foreign accounts, self-employment, or the impatriate regime are involved.
Expat CPA can help coordinate your U.S. obligations with your Belgian tax situation, identify opportunities to reduce double taxation, and review reporting requirements before major financial decisions.
If you are behind on your U.S. filings, our tax professionals can also help evaluate options such as the IRS streamlined filing procedures and available approaches to resolving penalties.
Contact Expat CPA for a cross-border tax consultation. We can determine how our team can support you, whether you need tax planning or filing.