Every year, May is one of the most demanding periods for finance and tax departments in Portugal. The overlap of filing and payment obligations, particularly around VAT and corporate income tax (IRC), turns this month into a real test of organisation, planning and liquidity.
From the SAF-T billing file at the start of the month to the IRC Modelo 22 and Modelo 54 returns on the last day, scarcely a week passes without a critical deadline. Knowing the calendar in advance and mapping out obligations is essential to avoid non-compliance, fines and cash-flow strain.
Main tax and contribution duties in May
By 5 May
- Submission of the SAF-T billing file, relevant for IRS, IRC and VAT purposes.
By 11 May
- Filing of the Monthly Remuneration Statement (DMR) for IRS, IRC and Social Security.
By 15 May
- Intrastat declaration for companies with intra-EU goods transactions.
- Notification of the option for the VAT regime on imports.
- Filing of Modelo 11, relevant for IRS, IMT and Stamp Duty.
By 20 May
- Periodic VAT return, both monthly and quarterly.
- VAT Recapitulative Statement.
- Withholding tax return for IRS and IRC.
- Monthly Stamp Duty return.
- Social Security statement (new template).
By 22 May
- Submission of the COPE declaration to the Bank of Portugal, for entities reporting economic operations abroad.
By 25 May
- Payment of VAT assessed in monthly and quarterly returns.
- Payment of Social Security contributions.
By 31 May
- Filing of IRC returns, namely Modelo 22 and Modelo 54.
The impact on company cash flow
Concentrating these duties into such a short window has an immediate effect on cash flow. Within a few days, companies must process large payments, coordinate internal data, validate accounting figures and submit highly detailed returns.
For organisations with thinner liquidity, the pressure is particularly intense and demands careful financial planning, ideally prepared weeks in advance. Forecasting cash flow, staggering payments where possible and aligning finance, accounting and tax teams make the difference between a smooth execution and a race against the clock.
Watch out for last-minute changes
Although the tax calendar is published, the Tax Authority may introduce occasional adjustments during the month, especially in exceptional circumstances or when electronic systems are unavailable.
Regularly checking the Tax Portal and staying close to your accounting team or tax adviser is the most effective way to avoid surprises.
How Grupo Your can help
At Grupo Your we support companies in fully meeting their tax and contribution obligations, from data collection and validation to filing returns and managing deadlines. Our team provides the technical rigour, risk anticipation and strategic advice that allow organisations to focus on what truly matters: their business.
If your company needs specialised support in this demanding month, get in touch. We help turn May's tax calendar into a controlled, predictable routine, free of surprises.
