The capital-gains reinvestment exemption has become more flexible. Anyone selling their own permanent home knows the principle: by reinvesting the sale proceeds in another own home, you may be exempt from personal income tax on the gain. The 2026 housing tax package added two significant novelties to this regime.
1. The exemption survives when reinvestment fails for reasons beyond your control
Until now, failing to reinvest within the legal deadline generally meant losing the exemption. The novelty is that the exemption may now be maintained even where reinvestment does not occur for reasons beyond the taxpayer’s control. It is an important safety valve for those whose purchase of the new home falls through due to circumstances they do not command.
2. A new exclusion: reinvesting in property for affordable rental
A new exclusion from taxation of capital gains now applies where the sale proceeds are reinvested in the purchase of property intended for letting at moderate rents. Reinvestment is no longer confined to an own home: channelling it into affordable rental supply can now benefit from the same advantageous treatment.
Why this matters when planning a sale
These changes alter the arithmetic for anyone considering selling. The decision to sell — and what to do with the money — now has more tax-efficient paths: reinvest in the new home, reinvest in affordable rental, or handle a frustrated reinvestment without automatically losing the benefit. Each path has its own deadlines, conditions and documentary proof.
The precautions to take
The exceptions are not automatic: they depend on strict compliance with the conditions and on the ability to demonstrate the facts before the Tax Authority (the external reason, the destination of the reinvestment, the deadlines). Before selling, it is worth simulating the framing and organising the proof — the difference between a secure exemption and a future correction.
Selling and reinvesting? Paulo Silva Silva, Lawyer, helps structure the operation and coordinate the capital-gains framing with your tax adviser, before signing. Book a meeting or contact geral@advpaulosilvasilva.com · +351 916 055 901.
This article is general in nature and does not constitute legal advice. Decree-Law no. 97/2026, of 20 May, and the specific conditions of each exception should be confirmed in the version in force in the Diário da República before any decision.