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How the gain is taxedCalculating the gainReinvestment reliefDeadlinesSelling a former foreign homeCommon questionsHow the gain is taxed
When a Portuguese tax resident sells property, half the capital gain is taxable. That 50% is added to your other income for the year and taxed at the progressive Portuguese income tax (IRS) rates, which run up to 48%. There is no flat 28% option for real estate, unlike shares. Since a 2023 reform, non-residents selling Portuguese property are taxed the same way, on 50% of the gain at progressive rates, which ended the old flat-rate regime for them.
Because the taxable half stacks on top of your salary or pension, a large gain can land partly in the top brackets. The reliefs below are what keep most main-home sales from producing a painful bill.
Calculating the gain
The gain is the sale price minus the adjusted acquisition cost, and the adjustments work in your favour:
Build the evidence behind the gain
Organise the evidence first, then check which amounts and relief conditions apply.
- AcquisitionPurchase date, price and acquisition documents.
- SaleSale date, proceeds and ownership share.
- Supporting costsKeep expense evidence for the costs you intend to include.
- The acquisition cost is uprated by an official inflation coefficient once you have owned the property for more than 24 months
- Documented purchase and sale costs count: IMT and stamp duty paid at purchase, agency commission on the sale, notary and registration fees
- Documented improvement works from the previous 12 years are added to cost, with invoices carrying your NIF
Reinvestment relief
The gain on your own permanent home escapes tax to the extent you reinvest the proceeds in another own permanent home in Portugal, the EU, or the EEA (where tax information exchange applies). The mechanics are precise:
- The property sold must have been your own permanent residence, and recent rules require it to have been so for at least 12 months before the sale
- What must be reinvested is the sale price net of any mortgage repaid on the sold property, and the exemption is proportional if you reinvest only part
- You declare the intention to reinvest in the tax return for the year of sale, then report the reinvestment when it happens
Sellers aged 65 or over, or retired, have an alternative: reinvesting the proceeds into an eligible pension or insurance product within six months of the sale can also shelter the gain, a route worth exploring where another house purchase is not the plan.
Worked example
Ana sells her Lisbon home and, after clearing the remaining mortgage, nets 300,000 euros of proceeds with a gain of 100,000 euros after adjustments (round figures for illustration); she reinvests 210,000 euros in a new main home.
That 15,000 euros joins Ana's other income at progressive rates; reinvesting the full 300,000 would have sheltered the whole gain, provided the occupation and declaration conditions below are met.
Deadlines
24 months before the sale
A new home bought up to 24 months before you sell the old one can count as the reinvestment. Buying first and selling second is covered, within the window.
36 months after the sale
Buying after the sale, you have 36 months to complete the reinvestment. Construction or works on the new home can qualify within the same period.
Occupation deadline
The new property must become your home: the rules expect you to occupy it and register it as your residence within 12 months of the reinvestment.
Declare on time
The sale goes in Anexo G of the Modelo 3 for the sale year regardless, with the reinvestment intention marked. Missing the declaration can cost the relief even when the reinvestment is real.
Selling a former foreign home
Here is the scenario that catches expats. You move to Portugal, become tax resident, and a year or two later sell your old house back home. Portugal taxes residents on worldwide gains, so that sale is Portuguese-taxable, on 50% of a gain measured from your original purchase price, possibly decades ago. There is no step-up in basis at the date you immigrated.
Reinvestment relief can apply to a home in the EU or EEA, but the sold property must qualify as your own permanent residence under the rules, which gets harder the longer you have lived in Portugal. A treaty may give the source country taxing rights too, with Portugal crediting the foreign tax, and the numbers differ by country; the tax treaties guide covers the framework. If a sale abroad is on your horizon, the cleanest planning window is before you become Portuguese tax resident, and this is a case where paid advice is cheap relative to the stakes.
Common mistakes
- Missing the intention box. The reinvestment plan is declared in Anexo G for the year of sale; skip it and the relief can be lost even when the reinvestment is real.
- Reinvesting the gain instead of the proceeds. The test is the sale price net of the mortgage repaid, not the gain; reinvest less than that and the exemption becomes proportional.
- Renovation invoices without a NIF. Works receipts missing your tax number add nothing to the cost basis; twelve years of improvements can evaporate at the worst moment.
- Letting the new home sit empty. The rules expect you to occupy the new property and register it as your residence within 12 months of the reinvestment.
- Assuming a step-up on immigration. Portugal measures the gain on a former foreign home from the original purchase price, not from its value when you moved here.
Common questions
I am selling at a loss. Anything to do?
Property losses can offset property gains within the rules, and the sale is still declared in Anexo G. A loss year with no other gains simply produces no tax.
Does the relief work if I sell in Portugal and buy in another EU country?
Yes, reinvestment in the EU or EEA qualifies, provided the new property becomes your own permanent residence and the other conditions hold. Moving away raises residency questions of its own.
What if I only reinvest part of the proceeds?
The exemption is proportional. Reinvest 70% of the net sale proceeds and 70% of the gain is sheltered, with the rest taxed normally.
The house was inherited. What is my cost basis?
Generally the value considered for stamp duty purposes at the inheritance, uprated by the inflation coefficient. Get the paperwork from the estate file before you list the property.
Sources
- CIRS article 10 (capital gains and reinvestment) and CIRS article 43 (50% inclusion)
- Autoridade Tributária, Modelo 3 Anexo G instructions and inflation coefficients ordinance
- Madeira Corporate Services and Your Overseas Home 2026 property capital gains guides (checked August 2026)
This guide is general information, not personalised tax advice. Rules and rates change, and your facts can move you off the defaults described here. Confirm your position with a qualified professional before acting on it.