Portugal: Key Tax Obligations and Deadlines for 2026
As the 2026 tax calendar begins in Portugal, several key compliance obligations require attention, including the confirmation of household composition, validation of invoices through the Portal e-Fatura, and reporting duties related to domestic workers. With important deadlines falling at the end of February and on 2 March 2026, timely action is essential to ensure accurate IRS assessments and safeguard available tax deductions
Portugal: Key Tax Obligations and Deadlines for 2026
With the start of a new year, several tax compliance obligations in Portugal require attention. Meeting the relevant deadlines is essential to ensure accurate tax assessments, safeguard available deductions, and avoid potential penalties. Below is an overview of the main requirements and deadlines for the 2026 tax calendar relating to the 2025 tax year.
Household Composition (Agregado Familiar)
For IRS purposes, the personal and family situation considered by the tax authorities is the one existing on 31 December of the relevant tax year. This includes marital status, tax domicile, and dependent status.
Under Article 13 of the Portuguese Personal Income Tax Code (CIRS), an individual may not simultaneously belong to more than one household for IRS purposes.
Situations Requiring an Update
Household composition must be updated whenever there are changes to the family situation, including:
- Marriage
- Birth of children
- Divorce or legal separation (including termination of a de facto union)
- Acquisition of a main and permanent residence
- Children ceasing to qualify as dependents (for example, upon reaching 26 years of age or earning more than €9,870 per year)
- Joint custody arrangements with alternating residence, as established in a parental responsibilities agreement
Deadline
2 March 2026
If no update is made, the Autoridade Tributária e Aduaneira will automatically rely on the
information from the previous year, which may result in inaccuracies in the
IRS assessment.
Invoice Validation: e-Fatura
Invoice validation remains a crucial step in securing tax deductions.
By this date, taxpayers must validate all invoices through the Portal e-Fatura to ensure that expenses are correctly classified and considered for deduction purposes.
In particular:
- All invoices must be reviewed and validated to confirm their allocation to the appropriate expense categories.
- Self-employed individuals are required to indicate whether each expense relates exclusively to their professional activity or is of a mixed/personal nature.
Failure to validate invoices may lead to expenses being disregarded for deduction purposes, potentially increasing the final tax liability.
Deadline
2 March 2026
Domestic Workers: Salary Reporting and Annual Declaration
Employers of domestic workers are subject to specific annual reporting obligations.
Communication of Salaries and Social Security Contributions (Relating to 2025)
Deadline: 2 March 2026
Salaries paid and the corresponding social security contributions must be properly communicated within the applicable deadline.
Submission of Modelo 10
Modelo 10 must be filed with the Autoridade Tributária e Aduaneira by the end of February, maintaining the annual obligation to report payments made in connection with domestic employment.
Compliance and Planning
Accurate and timely compliance with these obligations is fundamental to ensuring correct tax treatment and avoiding unnecessary exposure to penalties or additional tax assessments. Early review of personal, professional, and household information is strongly recommended to ensure all data is properly reflected within the established deadlines.
At LVP Advogados, we assist individuals and families in ensuring full compliance with Portuguese tax obligations, including household updates, invoice validation, and domestic employment reporting.
For tailored guidance on meeting upcoming deadlines and optimising your tax position, please submit our
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New Portugal and the United Kingdom Double Taxation Agreement and Tax Information Exchange Agreement
