Taxpayers must submit changes in household composition and validate deductible expenses on the Tax Authority Portal (Portal das Finanças) and confirm receipts via E‑Fatura before the deadline on Monday, according to tax guidance. Missing the window can mean lost deductions or delayed tax refunds, so residents who paid eligible expenses or had family changes this year should log in and check their records now. Those uncertain about document requirements should contact an accountant or the tax helpline.
Deadline to claim IRS deductions closes Monday
Friday, 27 February 2026AI summary
Context & Explainers
E-fatura is the online invoice system of the Tax and Customs Authority (Autoridade Tributária e Aduaneira), to which businesses report every invoice issued with a customer's tax number (NIF). Taxpayers log in to check these invoices and assign them to expense categories such as health, education or housing, because the validated amounts become deductions on their annual IRS return.
The Portal das Finanças is Portugal's official online tax platform, operated by the Autoridade Tributária e Aduaneira (AT — Tax and Customs Authority). It is where individuals and businesses file tax returns, check tax records, make payments, and manage their fiscal affairs.
Key functions include filing the annual IRS return (Modelo 3), accessing e-invoices (e-fatura), consulting property tax (IMI) records, requesting tax residency certificates, and paying outstanding tax debts. Access requires a NIF (tax identification number) and a password or digital key.
The portal is essential for anyone living or working in Portugal. Residents should be aware that scam messages impersonating the AT are common — always access the portal directly at portaldasfinancas.gov.pt rather than through links in emails or SMS.
