Portugal tax deadlines for October 2026

Portuguese companies face several critical tax and social security deadlines throughout October 2026. Key obligations include the submission of the SAF-T billing file by October 6 and the monthly declaration of remunerations to the Tax Authority and Social Security by October 12.

Other significant dates include the submission of Intrastat declarations and VAT import options by October 15, and the monthly Stamp Duty declaration by October 20. Additionally, companies must manage VAT recapitulatives and withholding tax declarations during the third week of the month.

By the end of the month, specifically by October 31, entities must address quarterly Social Security declarations, Model 30 for IRS/IRC, and the second installment of the Unique Circulation Tax (IUC) for payments exceeding 100 euros that were opted for in installments.