When a property is sold for an amount higher than its acquisition value, a taxable capital gain may arise for PIT purposes. In Portugal, as a general rule, only 50% of the capital gain is subject to taxation for tax residents.
However, the Portuguese PIT Code provides for a tax exemption mechanism where the property sold corresponds to the taxpayer’s permanent main residence and the proceeds are reinvested in another property intended for the same purpose.
To benefit from this exemption, several conditions must be met simultaneously:
- The property sold must correspond to the taxpayer’s or household’s permanent main residence;
- The reinvestment must occur within the 24 months prior to or 36 months following the sale;
- The taxpayer must declare the intention to reinvest in the annual PIT return;
- The reinvestment must relate to the sale proceeds net of any outstanding mortgage associated with the sold property.
The Clarification Issued by the Portuguese Tax Authority in 2026
The recent Binding Tax Ruling issued in April 2026 analysed an increasingly common situation: a couple living in a de facto union residing in a property owned solely by one of the partners.
Subsequently, the couple acquired a new property in co-ownership, partially financed through a bank loan. After the acquisition, the property initially owned exclusively by one partner was sold.
The issue submitted to the Portuguese Tax Authority concerned the amount that could be considered as reinvestment for the purposes of exemption from capital gains taxation.
The Tax Authority confirmed that, although the sold property was exclusively owned by one member of the de facto union, the reinvestment tax benefit could still apply provided the property effectively constituted the permanent main residence of the household.
Which Amount Counts as Reinvestment?
One of the most important aspects of this regime is understanding that it is not the capital gain itself that must be reinvested.
The law requires the reinvestment of the sale proceeds, reduced by any outstanding mortgage debt linked to the disposed property.
For example:
- Property sale price: €350,000
- Outstanding mortgage balance: €100,000
- Relevant amount for reinvestment: €250,000
If the reinvestment is only partial, the exemption from taxation will also apply only partially.
De Facto Unions and Taxation: Are There Differences?
Although de facto unions have gradually become more aligned with marriage for several tax purposes in Portugal, certain situations still raise interpretative questions before the Portuguese Tax Authority.
The recently published Binding Tax Ruling demonstrates that the Tax Authority accepts the exemption from taxation even where the sold property belongs solely to one member of the de facto union, provided it was effectively allocated as the household’s permanent main residence.
Nevertheless, these situations require careful analysis regarding property ownership, permanent residence status and the manner in which the reinvestment is carried out.
Important Aspects Taxpayers Should Not Ignore
There are several common mistakes in property sale and reinvestment operations in Portugal:
- Failing to update the tax address in due time;
- Incorrectly declaring the intention to reinvest in the PIT return;
- Confusing the concept of capital gain with the actual amount required for reinvestment;
- Failing to comply with the legal deadlines established in the Portuguese PIT Code;
- Incorrectly assuming that any property acquisition qualifies for the exemption.
In addition, the tax address remains a crucial element in proving the permanent main residence before the Portuguese Tax Authority.
Conclusion
The exemption regime applicable to property capital gains in Portugal remains one of the most relevant tax mechanisms for taxpayers selling and acquiring a permanent main residence.
However, the rules are complex and require particular attention, especially in situations involving de facto unions, co-ownership structures, mortgage financing and partial reinvestments.
The recent Binding Tax Ruling issued by the Portuguese Tax Authority reinforces that these transactions must be analysed on a case-by-case basis, considering the household’s actual circumstances and the legal requirements established under the Portuguese PIT Code.
A proper tax assessment before selling a property may prevent significant tax costs and ensure the correct application of the reinvestment regime.
How can Nominaurea help?
Nominaurea provides specialised support in tax and accounting matters related to:
- Property capital gains calculations;
- PIT tax impact simulations;
- Main residence reinvestment analysis;
- Assistance with annual PIT return compliance;
- Tax framework analysis for de facto unions and co-ownership situations;
- Real estate tax planning.
Before selling or acquiring a property, a proper technical analysis can make a substantial difference to the tax payable.
