Belgian tax for retirees: what's protected, what's exposed, and what's new in 2026.

By Nick · Europe Unlocked · Every figure sourced to an official body and dated.

Belgium taxes hard but predictably. For an American retiree the headline is good — Social Security stays US-taxed — and the fine print is expensive: IRA withdrawals at progressive rates up to 50%, a brand-new 10% capital-gains tax, and inheritance taxes that treat a surviving spouse better than your children. Here's the map, drawn honestly.

When do you become a Belgian tax resident?

Registering at a Belgian commune — which every long-stay resident must do within 8 working days of arrival — creates a legal presumption that you are a Belgian tax resident. From that point Belgium taxes your worldwide income. There is no Portuguese-style special regime for foreign pensioners, no flat tax, no honeymoon period. The Belgian system is the deal on day one, so run the numbers before you register, not after.

US retirees: income by income

Canadian retirees: the short version

Canada and Belgium have had an income tax treaty since 2004 and a social-security agreement since 1 January 1987 (CPP and OAS totalization). Once you're a Belgian resident, Canada applies non-resident withholding to CPP, OAS, and RRIF/RRSP payments — up to 25%, reduced where the treaty provides — and Belgium generally taxes pension income of its residents with credit for Canadian tax. Two Canada-specific points: departure tax (Canada deems you to have sold most assets when you cease residency — plan the timing) and OAS residence rules (OAS is payable abroad indefinitely only with 20+ years of Canadian residence after age 18; the totalization agreement can help you qualify). Confirm your exact treaty withholding rates with a cross-border adviser — they differ by income type.

The 2026 capital-gains tax — the big change

Until this year, Belgium famously didn't tax normal capital gains. That ended on 1 January 2026. The new regime — adopted by parliament on 2 April 2026 with retroactive effect from 1 January 2026 — works like this:

• 10% on realised gains from financial assets: shares, bonds, funds, ETFs, certain insurance products, crypto — and, for the first time, physical gold.
• €10,000 per person per year exempt (couples filing on a joint basis effectively double this; the exemption details have year-to-year carry mechanics — check current guidance).
• Historic gains are grandfathered: only gains accrued from 1 January 2026 count — asset values were effectively stepped up at 31 December 2025.
• Exit tax: emigrating from Belgium triggers a deemed realisation of latent gains. If you might not stay forever, understand this before you bring your portfolio into Belgian residence.
• Substantial shareholdings (≥20% of a company) have their own — gentler — regime: the first €1 million of gain is exempt over a rolling 5 years, with tiered rates of 1.25–10% above it. Sales to your own holding company and speculative trading outside normal private wealth management stay taxable at 33%.

What Belgium doesn't tax

• No general net wealth tax. The only wealth-type levy is the annual 0.15% tax on securities accounts whose average value exceeds €1 million per account.
• No Belgian tax on US Social Security, as above.
• No annual tax on owning your home beyond the regional property tax (précompte immobilier / onroerende voorheffing), which is based on the property's cadastral income and varies by region and commune — typically some hundreds to a couple of thousand euros a year for an ordinary home.

The one nobody budgets for: inheritance tax

Belgian inheritance tax is regional (Flanders, Wallonia, Brussels), applies to worldwide estates of Belgian residents, and climbs steeply: even in the direct line (spouse, children) top rates reach 27% in Flanders and 30% in Brussels and Wallonia on larger shares; distant heirs and non-relatives can face 55–80% depending on region. The family home passing to a surviving spouse or legal cohabitant is exempt in all three regions. If you retire to Belgium with substantial assets, estate planning is not optional — Belgian notaries and cross-border planners deal with this daily, and lifetime gift routes at low flat rates exist.

Practicalities

• Filing: annual return via MyMinfin (Tax-on-Web); deadlines typically fall mid-year for the prior income year.
• Declare foreign accounts: Belgian residents must report foreign bank and investment accounts to the National Bank's central contact point and tick the boxes in the return. US citizens keep FBAR/FATCA obligations too.
• FX: €1 ≈ US$1.14 (July 2026). Belgium assesses in euros.