Tax portal deadline for 2025 invoices extended

The Tax and Customs Authority (Autoridade Tributária e Aduaneira or AT) says taxpayers can validate invoices related to the 2025 IRS on the Portal until 2 March, not the usual 28 February, RTP and Correio da Manhã report. The short extension affects anyone who itemises deductions and must confirm invoices on the AT site before the new deadline. Log into the tax portal, confirm your invoices and keep digital receipts in case of queries. Taxpaying residents should act before 2 March to avoid missing deductible expenses.

Update: Deadline falls on Monday 2 March, AT confirms

Diário de Notícias reports AT confirmed by email that because 28 February is a Saturday this year the validation deadline moves to the next working day, Monday 2 March; RTP and CNN Portugal issued alerts reminding taxpayers the Portal will accept invoices up to that date.

Context & Explainers

The limitation period for most tax debts in Portugal is eight years (prescrição), with the start date depending on the tax type: from the tax event for taxes like IMT, from the end of the year in which the event occurred for IRS and IRC, or from the start of the following calendar year for withholdings. For expats this means tax authorities can assess or collect many debts for up to eight years after the triggering event, so it’s important to keep tax records for that period.

The IRS withholding tables are government-published schedules used by employers, pension payers and other payers to calculate how much personal income tax (personal income tax (Imposto sobre o Rendimento das Pessoas Singulares) — IRS) must be deducted from each pay period. They take into account gross pay, pay frequency, marital status and dependents; updates (usually published annually or when the budget changes) affect your monthly take-home pay and are reconciled with your annual tax return (Modelo 3).

The Tax Portal (Portal das Finanças) is Portugal's official online service where individuals and businesses access tax records, file returns, and make payments. On 6 February 2026 the Tax and Customs Authority (Autoridade Tributária e Aduaneira or AT) used the portal to warn taxpayers about scam SMS messages falsely demanding payment to 'avoid seizure'; residents should ignore unsolicited payment links and check the portal or contact AT directly.