Quarterly Declaration
Declaração Trimestral
Last updated:
The English term for the quarterly income report filed with Portuguese Social Security, used to calculate freelancer contributions for the following quarter.
The quarterly declaration is the English name for the declaração trimestral: the income report that freelancers in Portugal file with Social Security every three months.
If you've worked as a freelancer in other countries, you may be used to tax returns determining everything. In Portugal, there's a separate system just for Social Security contributions, and the quarterly declaration is how it stays in sync with your actual earnings.
Why it exists
Portugal's Social Security system for independent workers is contribution-based. Rather than charging a flat rate, it adjusts your monthly payment based on what you actually earned. The quarterly declaration is the mechanism that makes this possible, you report your income, and Social Security recalculates.
The filing schedule follows a fixed calendar:
- January: report income from October through December
- April: report income from January through March
- July: report income from April through June
- October: report income from July through September
Each declaration determines your contributions for the following three months. If your income went up, contributions rise. If it went down, they decrease, though there's always a minimum.
First-year exemption
New freelancers get a break. When you register through the abertura de atividade (opening activity), you're exempt from Social Security contributions for 12 months. No contributions, no quarterly declarations. The obligation kicks in after that year ends.
Where to file
You file through Segurança Social Direta at segurancasocial.pt, this is a separate portal from the Portal das Finanças where you handle tax matters. You'll need your NISS (Social Security identification number) and a separate password.
The portal is only available in Portuguese, but the declaration itself is straightforward: you enter your total earnings for the quarter and submit. Social Security handles the calculation.
For the full filing schedule and details on what happens if you miss a deadline, see the Portuguese entry: Declaração Trimestral.
Frequently asked questions
What is the quarterly declaration in Portugal?
It's the English name for the declaração trimestral, a report you file every quarter with Portuguese Social Security declaring your income from the previous three months. Social Security uses it to calculate your contributions for the next quarter.
When do I need to start filing quarterly declarations?
After your 12-month Social Security exemption ends. The exemption begins when you open activity (abertura de atividade). Once those 12 months are up, you file in the next applicable quarter, January, April, July, or October.
Is this the same as filing a VAT return?
No. The quarterly declaration goes to Social Security (Segurança Social), not to the tax authority. It's about your Social Security contributions, not VAT. If you're registered for VAT, your VAT returns are a separate obligation filed through the Portal das Finanças.
What income do I report on the quarterly declaration?
You report your total freelance earnings for the previous quarter. This is the gross income from your invoices, what clients paid you before any withholding tax or expenses. Social Security applies its own formula to calculate contributions.
Can I file the quarterly declaration in English?
No. Segurança Social Direta, the online portal where you file, is only available in Portuguese. However, the quarterly declaration form is relatively simple, you're mainly entering a single income figure. The portal is at segurancasocial.pt.
Related terms
The quarterly income report that solo entrepreneurs file with Social Security (Segurança Social) to calculate their monthly contributions for the following quarter.
Segurança SocialSocial SecurityPortugal's social security system. Solo entrepreneurs contribute 21.4% of declared income to fund healthcare, sick leave, parental leave, and retirement pension.
Trabalhador IndependenteSelf-Employed WorkerThe Portuguese term for an independent worker or sole entrepreneur, the equivalent of a freelancer or sole trader in other countries.
Abertura de AtividadeOpening ActivityThe process of registering as a self-employed worker (trabalhador independente) with the Portuguese tax authority, officially starting your freelance activity.