Tax Calendar 2026: All the Deadlines Your Business Needs to Know

Tax Calendar 2026: The Complete Guide for Businesses in Portugal

Managing a business in Portugal requires thorough knowledge of tax obligations and their respective deadlines. Missing any date can result in fines, late interest charges, and unnecessary problems with the Tax Authority.

To make life easier for business owners and managers, Grupo Your has created an interactive tax calendar with all relevant 2026 dates - organized by month and tax type.

👉 View the complete 2026 Tax Calendar here

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What Tax Obligations Are Covered?

Our calendar covers all major tax obligations that businesses and professionals in Portugal must meet throughout the year:

VAT (Value Added Tax)

Monthly regime: submission by the 10th of the 2nd month following the reference period

Quarterly regime: submission by the 15th of the 2nd month following the quarter

Recapitulative statement: intra-community operations declaration

Corporate Tax (IRC)

Advance payments: in July, September and December

Model 22 Declaration: submission by May 31 (previous fiscal year)

IES/DA: Simplified Business Information by July 15

Income Tax (IRS)

Withholding Tax: monthly submission by the 20th

Model 10 Declaration: income paid to third parties

DMR: Monthly Remuneration Declaration

Social Security

Monthly contributions: submission and payment by the 20th of each month

Remuneration declarations: mandatory monthly

Property Tax (IMI) and Additional Property Tax (AIMI)

IMI: payment in May (or installments in May, August and November)

AIMI: Additional property tax deadline in September

SAF-T and Communications

Invoice communication: by the 5th of the following month

Accounting SAF-T: annual submission

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Why Is a Tax Calendar Essential?

Many businesses still rely on manual notes or trust solely their accountant to remember deadlines. The problem? Missing just one date can lead to penalties.

With our interactive tax calendar, you can:

✅ View all deadlines organized by month

✅ Filter by tax type (VAT, corporate tax, income tax, social security, etc.)

✅ Subscribe to free email alerts to never miss a deadline

✅ Plan ahead for cash flow and tax submissions

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Subscribe to Free Tax Alerts

On our tax calendar, you can enter your email to receive automatic reminders before each deadline. It is free, no commitment, and you can cancel at any time.

👉 Access the 2026 Tax Calendar and subscribe to alerts

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Do Not Leave for Tomorrow What You Can Plan Today

Timely compliance with tax obligations is not just a legal matter - it is a matter of smart management. Businesses that plan their tax commitments in advance avoid surprises, optimize cash flow, and maintain a healthy relationship with finances.

If you need support managing your company's tax affairs, Grupo Your is here to help. We offer accounting services, tax consulting, and personalized support for SMEs and sole traders.

👉 Contact us to find out how we can simplify your tax life.

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