Most explanations of Portuguese self-employed Social Security give you a rate and leave you to guess what it applies to. The rate is the last step but one. What decides the number is a chain of five operations applied in a fixed order, and applying them in a different order gives a different answer.
The quarterly declaration
A self-employed worker declares the income of the three preceding months by the last day of January, April, July and October. That declaration is what sets the contribution for the following quarter.
The calculation, in order
- Apply the coefficient. Not all of what you invoiced counts. Services count at 70%; goods count at 20%. Hotel, restaurant and drinks activity also counts at 20%.
- Sum the quarter — the three months of relevant income together.
- Apply your variation, if you set one. You may move the base up or down by as much as 25%, in steps of 5%.
- Divide by three. That gives the monthly contribution base.
- Clamp to the ceiling of twelve times the IAS.
- Apply the rate — then raise the result to the floor if it falls below it.
| Element | Value | Where |
|---|---|---|
| Coefficient — services | 70% | art. 162.º n.º 1 a) |
| Coefficient — goods | 20% | art. 162.º n.º 1 b) |
| Coefficient — hotel, restaurant and drinks | 20% | art. 162.º n.º 2 |
| Monthly base | Relevant income ÷ 3 | art. 163.º n.º 1 |
| Ceiling | 12 × IAS — €6,445.56/month at IAS €537.13 | art. 163.º n.º 5 |
| Rate — trabalhador independente | 21.4% | art. 168.º |
| Rate — empresário em nome individual | 25.2% | art. 168.º |
| Minimum contribution | €20.00 per month | art. 163.º n.º 2 |
| Variation option | ±25%, in 5% steps | art. 164.º n.os 1–2 |
If you have organised accounting
The coefficients do not apply. The base is the previous year's taxable profit (lucro tributável) instead — art. 162.º n.º 3.
When it is paid
Between the 10th and the 20th of the month following the one being paid for.
Worked through once
A freelancer invoicing €3,000 a month in services, with no variation set: relevant income is €2,100 a month (70%), so €6,300 over the quarter. Divided by three, the monthly base is €2,100 — well under the ceiling. At 21.4% the contribution is €449.40 a month, comfortably above the €20 floor.
The same freelancer invoicing €300 a month: base €210, contribution €44.94 — still above the floor. It takes a base under about €93 a month before the €20 minimum starts doing the work.
What is the Social Security rate for self-employed workers in Portugal?
21.4% for a trabalhador independente and 25.2% for an empresário em nome individual, applied to the monthly contribution base rather than to invoiced income.
How is the contribution base calculated?
Invoiced income is reduced by a coefficient — 70% for services, 20% for goods and for hotel, restaurant and drinks activity — summed across the quarter and divided by three, then capped at twelve times the IAS.
What is the minimum Social Security contribution in Portugal?
€20.00 per month. It is a floor on the contribution itself, so a very low income quarter still produces €20 a month rather than a proportionally smaller amount.
When is the quarterly declaration due?
By the last day of January, April, July and October, covering the three preceding months.
When is the contribution paid?
Between the 10th and the 20th of the month following the month being paid for.
Can I change my contribution base?
Yes. You may vary the base up or down by up to 25%, in steps of 5%, under art. 164.º of the contributory code.