If you sold your primary residence in Portugal (Habitação Própria e Permanente – HPP) and intended to reinvest the proceeds into a new home, 2026 is a critical year to review your IRS position.
Recent legislative changes — particularly under the “Mais Habitação” Law (Law no. 56/2023) — introduced temporary suspensions to the reinvestment deadline. As a result, the Portuguese Tax Authority (Autoridade Tributária e Aduaneira – AT) has intensified audits and issued additional tax assessments where reinvestment was not completed or correctly declared.
This guide explains how the Portuguese capital gains reinvestment regime works, what changed, and how to regularize your position if necessary.
1. How Capital Gains on a Primary Residence Are Taxed in Portugal
Under Article 10 of the Portuguese Personal Income Tax Code (CIRS):
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Only 50% of the capital gain is taxable for Portuguese tax residents.
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That taxable portion is aggregated with other income and taxed at progressive rates (up to 48% + solidarity surcharge).
However, capital gains may be fully or partially exempt if:
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The property sold was your primary and permanent residence (HPP) at the date of sale.
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The net sale proceeds (after mortgage repayment) are reinvested in another property also designated as HPP.
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The reinvestment is properly declared in Modelo 3 – Annex G.
Failure to comply results in full taxation of the applicable 50% portion.
2. Reinvestment Time Limits – The General Rule
The standard reinvestment window is:
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24 months before the sale, or
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36 months after the sale
The intention to reinvest must be declared in the Modelo 3 tax return of the year of sale, in Annex G.
This declaration is not optional. Without it, the AT may automatically assess capital gains tax once the reinvestment window expires.
3. Suspension of the Reinvestment Deadline (COVID Period Impact)
The “Mais Habitação” framework temporarily suspended the reinvestment deadline:
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Suspension applied from 1 January 2020
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Deadline counting resumed from 2 January 2022
This effectively extended the reinvestment window for properties sold in 2019, 2020, and 2021.
Practical Impact
For example:
If a property was sold in 2020:
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The 24-month look-back period counts from 31 December 2019
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The 36-month forward period only started on 2 January 2022
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The reinvestment deadline could therefore extend to end of 2024
As a result, 2024 became the final reinvestment year for many taxpayers who sold between 2019 and 2021.
4. Why Many Taxpayers Are Receiving Additional Assessments in 2026
The AT has initiated control procedures for tax years 2019, 2020, and 2021 where:
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Reinvestment was declared but never completed (fully or partially), or
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Reinvestment occurred but was not correctly reported in Modelo 3
If reinvestment was not executed, additional IRS plus interest is legally due.
If reinvestment occurred but was incorrectly declared, the situation may still be regularized.
5. How to Regularize an Undeclared Reinvestment
If the reinvestment was completed within the legally extended deadline but not properly declared, the recommended approach is:
Step 1 – Submit a Replacement Tax Return
File a Modelo 3 substitution for the year in which reinvestment occurred (not the year of sale).
Step 2 – Complete Annex G Correctly
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Declare the reinvested amounts in the relevant fields.
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If benefiting from the suspended deadline regime, ensure proper indication of the applicable special deadline field.
Step 3 – AT Recalculation
In principle, the AT will perform an automatic reassessment of the capital gains in the year of sale.
6. When the AT Does Not Automatically Correct the Assessment
In some cases, particularly for older tax years, the AT may maintain the additional assessment despite submission of a corrected return.
Available remedies may include:
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Revisão Oficiosa (Administrative Review)
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Reclamação Graciosa (Formal Administrative Claim)
Deadlines are critical. Acting promptly is essential to preserve procedural rights.
7. Critical Compliance Points for Expats and Relocating Families
For international clients relocating to Portugal, several risks frequently arise:
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Sale of a foreign primary residence before or after Portuguese tax residency
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Incorrect HPP classification at the time of sale
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Failure to update tax address before sale
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Misalignment between mortgage repayment and reinvestment calculation
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Incorrect declaration in Annex G
Remember: declaring the sale is not enough.
You must also declare the reinvestment in the correct tax year.
8. Key Takeaways
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Reinvestment must occur within 24 months before or 36 months after sale (subject to suspension rules for 2019–2021 cases).
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The intention to reinvest must be declared in the year of sale.
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The actual reinvestment must be declared in the year it occurs.
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Incorrect or missing reporting triggers additional IRS and interest.
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Late corrections are possible, but timing and technical accuracy are crucial.
Strategic Advisory Note
Portuguese capital gains on primary residence are often misunderstood, particularly by expatriates managing cross-border moves. The reinvestment regime is highly technical and procedural compliance is as important as economic reinvestment itself.
If you sold property between 2019 and 2022 and declared reinvestment — or intended to — 2026 is the appropriate moment to conduct a technical review of your IRS filings.
If you require a structured review of your capital gains position or assistance with a corrective filing, our team provides specialist support in Portuguese IRS compliance, cross-border capital gains analysis, and interaction with the Portuguese Tax Authority.
This article is for informational purposes only and does not constitute binding tax advice. Portuguese tax outcomes depend on the specific facts and documentation of each case.
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