Modelo 3 — Annual IRS Return

Modelo 3 is Portugal's annual personal income tax return (declaração de IRS). Tax residents must file Modelo 3 for each tax year, covering all income received from 1 January to 31 December. The filing window opens 1 April and closes 30 June of the following year (e.g., 2025 income is declared in April–June 2026). The return is filed electronically through the Portal das Finanças. AT pre-fills much of the return based on information received from employers, banks, and other payers (the automatic declaration — declaração automática) — taxpayers can simply confirm the pre-filled data if complete. Upon submission, AT calculates the final IRS liability, deducting all withheld amounts, and either issues a refund or requests additional payment — usually within 1–2 months.