Running a business in Portugal means keeping track of numerous tax deadlines throughout the year. Missing these dates can result in penalties and unnecessary stress. Here’s your complete guide to the 2026 tax calendar.
Q1 – January to March
January 31: IRS Model 10 submission deadline for income paid in 2025.
February 28: IRC (Corporate Tax) advance payment for companies with annual revenue over €500,000.
March 15: Monthly VAT return submission (for monthly regime taxpayers).
Q2 – April to June
April 30: IRS annual declaration deadline for individual taxpayers.
May 31: IRC Model 22 annual declaration submission.
June 30: IES (Simplified Business Information) submission deadline.
Q3 – July to September
July 15: Second IRC advance payment deadline.
August: Reduced activity period – most deadlines are extended.
September 15: Third IRC advance payment deadline.
Q4 – October to December
October 31: IMI (Property Tax) second installment deadline.
November 30: Communication of invoices to AT portal.
December 15: Final IRC advance payment and year-end preparation.
How EasyFin Helps
EasyFin automatically tracks all these deadlines and sends you reminders before each due date. Our dashboard shows upcoming obligations and their status, so you never miss a payment.