Quick answer: self-employed workers (*trabalhadores independentes*) must submit their quarterly declaration on *Segurança Social Direta* (Social Security Direct online portal) by the last day of January, April, July, and October, reporting gross income from the previous three months. A 21.4% rate is applied to 70% of this income (for services rendered), divided by three, to determine the monthly contribution payable over the following three months.
It is one of the most frequently missed obligations for those working on *recibos verdes* (freelance invoices), especially those with irregular billing or who combine self-employment with employed work.
In summary
- 2026 Deadlines: 31 January, 30 April, 31 July, and 31 October. If a deadline falls on a weekend or public holiday, it moves to the next working day.
- Rate: 21.4% for general self-employed workers and 25.2% for sole traders (*empresários em nome individual*), EIRL holders (single-member limited liability companies), and working spouses.
- Relevant income: 70% of service provision income or 20% of production and sale of goods.
- Minimum contribution: 20 euros per month.
- Maximum base in 2026: 6,445.56 euros per month (12 x IAS [*Indexante dos Apoios Sociais* – Social Support Index] of 537.13 euros), resulting in a maximum monthly contribution of approximately 1,379 euros.
- You must submit a declaration even with zero income.
Who has to submit
All self-employed workers covered by the contribution scheme, including those who issue *recibos verdes* sporadically, except in specific cases of exemption.
Self-employed workers who combine freelance work with employment are exempt from contributing—and may therefore be exempt from filing the declaration—if they meet three conditions cumulatively: average monthly relevant income is less than 4 times the IAS, the employed work is provided to an entity different from the freelance client, and actual Social Security contributions are made on that employment.
Exemptions are also available for pensioners under certain conditions and for those benefiting from the first-year activity exemption.
How to calculate the contribution, step by step
Step 1. Add up the gross income for the three months of the quarter, excluding IVA (VAT).
Step 2. Apply the coefficient:
- 70% for service provision income;
- 20% for production and sale of goods.
Step 3. Divide by three to determine the monthly contribution assessment base.
Step 4. Apply the 21.4% rate (or 25.2%, depending on your classification).
Practical example
A freelance designer billed 4,500 euros in the quarter from April to June 2026.
| Step | Calculation | Amount |
|---|---|---|
| Gross quarterly income | €4,500 | |
| Relevant income (70%) | 4,500 × 0.70 | €3,150 |
| Monthly base | 3,150 ÷ 3 | €1,050 |
| Monthly contribution (21.4%) | 1,050 × 0.214 | €224.70 |
This amount is paid in August, September, and October, always between the 10th and 20th of the month following the month to which it relates.
The +/- 25% adjustment almost no one uses
When submitting the declaration, you can request an adjustment to your relevant income within a range of -25% to +25%, in 5% increments.
What is it for?
- Reduce by up to -25% when anticipating a quiet quarter and cash flow is tight. This lowers your monthly contribution, but also reduces future social protection and the calculation base for sick pay or parental leave.
- Increase by up to +25% when wanting to boost your contribution record, typically when preparing for retirement or planning a period of parental leave.
It is a financial decision, not just an administrative step. It is worth discussing with your accountant before submitting.
First-year exemption: the classic mistake
Anyone registering as self-employed for the first time generally benefits from a 12-month contribution exemption, provided they have not engaged in self-employed activity in the previous three years.
The mistake is assuming the exemption is permanent. From the 13th month, contributions start automatically and the first quarterly declaration becomes mandatory. Many freelancers discover this when they receive their first payment notice, by which time arrears have accumulated.
You can voluntarily waive the exemption by submitting the quarterly declaration if your goal is to start building social protection right away.
What happens if you fail to submit
Failing to submit the quarterly declaration is a minor administrative offence punishable by a fine. More critical than the fine is the practical impact:
- *Segurança Social* (Social Security) maintains the last known assessment base or applies the minimum contribution, which can result in inaccurate calculations.
- It creates contribution non-compliance, blocking tax clearance certificates, state support, and in some cases, contracts with public entities.
- Benefits such as sick leave, parental pay, and cessation of activity allowance are put at risk.
2026 Calendar at a glance
| Declaration | Income from | Submission deadline | Contributions paid in |
|---|---|---|---|
| January | Oct, Nov, Dec of previous year | 31 January | Feb, Mar, Apr |
| April | Jan, Feb, Mar | 30 April | May, Jun, Jul |
| July | Apr, May, Jun | 31 July | Aug, Sep, Oct |
| October | Jul, Aug, Sep | 31 October | Nov, Dec, Jan |
Five costly mistakes
- Failing to declare when there was no billing. The declaration is mandatory even with zero income.
- Declaring amounts including IVA (VAT). Income must be reported excluding VAT.
- Confusing categories. Service provision and goods sales have very different coefficients (70% vs 20%).
- Failing to set aside cash. Since contributions are not withheld at source, a good rule of thumb is to set aside around 21% of total billed revenue.
- Ignoring combination with employed work. Many self-employed individuals pay contributions from which they would otherwise be exempt.
Frequently asked questions
Do I need to submit the declaration even with no income?
Yes. The declaration is mandatory even if you billed nothing during the quarter.
When do I pay the contribution?
Between the 10th and 20th of the month following the month to which the contribution relates.
What is the minimum contribution in 2026?
20 euros per month, even with no declared income.
Is there a maximum contribution limit?
Yes. The monthly assessment base cannot exceed 12 times the IAS, which is 6,445.56 euros in 2026.
I am self-employed and also employed. Do I pay for both?
It depends. You are exempt from self-employed contributions if your average monthly relevant income is under 4 times the IAS, your employer is a different entity from your freelance client, and contributions are actively being paid on your employment.
Need help managing your recibos verdes?
Grupo Your supports self-employed workers across the country, from initial business registration to fulfilling tax and social security obligations throughout the year. Speak to us and avoid surprises.
Related articles:
- Recibos Verdes and Landlords: Find Out What You Can Deduct on Your IRS Tax Return
- IRS Category A + B: Complete Guide for Those Combining Employment and Recibos Verdes
- How to Declare Airbnb, Uber, Bolt, and Glovo Income on Your 2026 IRS Return
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