🇵🇹EU Tax Calendar

Portugal Tax Calendar 2026

Every Autoridade Tributária e Aduaneira (AT) tax deadline explained in plain English — VAT, corporate tax, personal income tax, social security, and more. Covers key filing and payment dates required by the EU VAT Directive and national tax laws.

Next Portugal deadline

Sep 15, 2026 · in 6 days

VAT Return — August 2026 Due

Monthly VAT return for August 2026 due.

Add these dates to your calendar (.ics)
PortugueseEuro (EUR)January 1 – December 31
Jan '26Feb '26Mar '26Apr '26May '26Jun '26Jul '26Aug '26Sep '26Oct '26Nov '26Dec '26

January2026

Jan15

VAT Return — December 2025 Due

Monthly VAT return for December 2025 due for businesses on monthly filing.

IVAVAT

February2026

Feb15

VAT Return — January 2026 Due

Monthly VAT return for January 2026 due.

IVAVAT

March2026

Mar15

VAT Return — February 2026 Due

Monthly VAT return for February 2026 due.

IVAVAT

April2026

Apr15

VAT Return — March 2026 Due

Monthly VAT return for March 2026 due.

IVAVAT

May2026

May15

VAT Return — April 2026 Due

Monthly VAT return for April 2026 due.

IVAVAT
May31

Personal Income Tax Return — Filing Deadline

Deadline for filing annual personal income tax return (IRS) for the previous year.

Modelo 3Personal Income Tax

June2026

Jun15

VAT Return — May 2026 Due

Monthly VAT return for May 2026 due.

IVAVAT

July2026

Jul15

VAT Return — June 2026 Due

Monthly VAT return for June 2026 due.

IVAVAT

August2026

Aug15

VAT Return — July 2026 Due

🏛 Assumption Day

Monthly VAT return for July 2026 due.

IVAVAT

September2026

Current
Sep15

VAT Return — August 2026 Due

Monthly VAT return for August 2026 due.

IVAVAT

October2026

Oct15

VAT Return — September 2026 Due

Monthly VAT return for September 2026 due.

IVAVAT

November2026

Nov15

VAT Return — October 2026 Due

Monthly VAT return for October 2026 due.

IVAVAT

December2026

Dec15

VAT Return — November 2026 Due

Monthly VAT return for November 2026 due.

IVAVAT

Key Tax Categories

Browse the main tax categories for Portugal. Each category includes key forms and filing requirements.

VATVAT Return
CITCorporate Income Tax
PITPersonal Income Tax
SSSocial Security
WHTWithholding Tax
CTCapital Taxes

Frequently Asked Questions

How often is VAT filed in Portugal?
This calendar shows a monthly VAT filing — 12 of them across the 2026 calendar. Each one falls on the 15th of the month. Filing frequency depends on the turnover band and the scheme a business is registered under, so a smaller business may report less often than the monthly cycle listed here. Confirm your own frequency with Autoridade Tributária e Aduaneira (AT).
When is the personal income tax return due in Portugal?
May 31, 2026 (Personal Income Tax Return — Filing Deadline). Extensions and agent-filed deadlines can differ; the dates above are the ones shown on this calendar.
What does this Portugal tax calendar cover?
13 filing and payment deadlines for 2026, grouped by month: vat and personal income tax. Each entry names the form where one applies and flags public holidays that fall near a deadline. The authority behind these dates is Autoridade Tributária e Aduaneira (AT).
Is this calendar official Autoridade Tributária e Aduaneira (AT) guidance?
No. It is a plain-English summary built to help you plan, and it is not tax advice. Dates can change, and your own obligations depend on your registration, turnover and scheme. Always confirm against Autoridade Tributária e Aduaneira (AT) before you rely on a date, and speak to a qualified adviser about your own situation.
Do EU-wide VAT rules change these Portugal dates?
The EU VAT Directive sets a common framework, but each member state keeps its own filing calendar, thresholds and rates — which is why Portugal has its own page here rather than a shared EU one. If you sell across borders, the One-Stop Shop lets you declare VAT centrally instead of registering in each country.

What Portugal files, and how often

13 deadlines in the 2026 calendar, by tax type.

  • VATMonthly · 12 dates · always the 15th
  • Personal Income TaxOnce a year · 1 date

Counted from the dates listed on this page. Your own filing frequency depends on turnover, registration and scheme — confirm it with Autoridade Tributária e Aduaneira (AT).

Terms used on this page

Plain-English definitions, in case a word on a deadline is doing more work than it looks like.

Paperwork these dates tend to involve

Free tools that work for Portugal filings.

Invoice generator

Build an invoice with the tax lines filled in.

Receipt generator

Issue a receipt once a payment clears.

Quote generator

Quote a job before the work starts.

Pro forma invoice

For cross-border sales before VAT is due.

Need help with Portugal tax forms?

Open any tax form in the AI Editor for step-by-step field guidance, auto-fill suggestions, and error detection before you submit.

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This tax calendar is provided as a reference guide. Deadlines may change due to legislative changes or Autoridade Tributária e Aduaneira (AT) announcements. Always verify with the {authority} website or a qualified tax professional. Autoridade Tributária e Aduaneira (AT) website.

Before you file or pay

How to verify a Portugal tax deadline

1. Match the obligation. Check the tax type, period, registration and filing method. A VAT, payroll or income-tax date may not apply to every taxpayer.
2. Check the live notice. Public holidays, agent arrangements, extensions and account-specific instructions can change the operational due date.
3. Keep proof. Save the submission receipt and payment confirmation. Filing and paying can be separate actions with separate cut-off times.

Why this matters: missed dates can lead to late filing charges, interest, loss of a relief or an avoidable compliance review. This page is a planning aid, not a legal determination. It was last content-reviewed on 2026-08-14; verify the live rule with Autoridade Tributária e Aduaneira (AT) before acting.

Check the official Autoridade Tributária e Aduaneira (AT) guidance

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