Portugal vs Belgium tax in 2026: what changes for a Belgian who moves or invests

Residence: domicile against the 183 days

Belgium taxes anyone whose domicile or seat of wealth is in Belgium — where the family lives and the affairs are managed — and presumes residence for anyone registered in the national register. Portugal taxes anyone who spends more than 183 days here in a twelve-month window or keeps a home that looks like a habitual residence (IRS Code, art. 16.º). The convention of 16 July 1969 breaks the tie in the usual order: permanent home, centre of vital interests, habitual abode, nationality.

Belgium’s departure formalities matter more than they used to: since 2026 leaving triggers a special tax return within three months and, for holders of financial assets, an exit tax on unrealised gains — deferred automatically for a move to Portugal, cancelled if the assets are not sold within two years.

• 25 % to 50 % Belgian brackets (from 16 720 €, 29 510 €, 51 070 € in 2026) plus communal surcharge; 12,5 % to 48 % Portuguese brackets
• 10 % new Belgian tax on gains from financial assets, 10 000 € a year exempt; 28 % in Portugal
• 15 % / 15 % / 10 % treaty ceilings on dividends, interest, royalties
• Exit tax when leaving Belgium with a portfolio — deferred within the EU, waived after two years without sale

Income tax, side by side

The Belgian top rate arrives at 51 070 € and the communal surcharge lifts it above 53 %; Portugal reaches 48 % only above 86 634 € but starts higher in the middle bands. On modest salaries Belgium’s 11 550 € quotité and expense deduction keep it lighter; the two systems converge around 60 000 €, and above 80 000 € Portugal is lighter on employment income — lighter still under IFICI. The full comparison is on the personal income tax page.

The convention of 1969, as amended in 1995

• Dividends: 15 % at source. Interest: 15 %. Royalties: 10 %. Belgium’s domestic 30 % withholding falls to those rates for a Portuguese resident; Portugal’s 28 % does the same the other way, with credit at home.
• Pensions: private and occupational pensions are taxable in the state of residence; public-service pensions stay with the paying state, as in the OECD model the convention follows. A Belgian who retires to Portugal declares the Belgian company pension here at the progressive rates; the state pension for a former civil servant stays Belgian.
• Property: rents and gains taxed where the property is, with exemption (with progression) in the residence state.
• Relief: Belgium exempts Portuguese-source income it may not tax and credits the treaty withholding on dividends and interest; Portugal credits Belgian tax. Full reading on the double-tax treaty page.

Companies and VAT

See corporate tax, VAT rates and withholding tax and capital gains.

Social security

Both countries apply the EU coordination rules: one system at a time, A1 certificates for postings of up to 24 months, pension periods added together. Belgium takes 13,07 % from the employee and a basic 24,92 % from the employer; Portugal 11 % and 23,75 %. Belgian pensioners in Portugal register with the SNS through the S1 and keep Belgian health cover.

Property in Portugal for a Belgian buyer

IMT by bracket on a main home (0 % to 106 346 €, up to 8 %), 1 % from the first euro on a second home, 7,5 % flat while you are still non-resident since 25 May 2026 (refundable when you become resident within two years), plus 0,8 % stamp duty. Yearly: IMI at 0,3–0,45 % of the tax value and AIMI above 600 000 €. Belgium’s registration duties — 12,5 % in Brussels and on second homes in Wallonia, 12 % in Flanders, cut to 3 % (Wallonia) and 2 % (Flanders) for the buyer’s own and only home — make the Portuguese entry cost look modest for a resident buyer; what Belgian landlords miss is the cadastral-income basis, because Portugal taxes actual rents at 25 %.

Special regimes

NHR closed on 1 January 2024. IFICI gives 20 % for ten years on Portuguese income from listed activities (research, start-ups, some exporting companies) and exempts foreign income with progression, for people not resident here in the previous five years; pensions are excluded. Belgium’s inbound-taxpayer regime works in the other direction and is irrelevant once you leave.

Before the move

Questions from Belgian clients