Social Security for Freelancers in Portugal: When to Pay, How Much, and How Not to Overpay

Social Security is the topic everyone mentions but almost no one explains with concrete numbers. Here are the numbers.

First year: you pay nothing

During the first 12 months of activity there is full exemption from Social Security contributions.

This period counts from the month you opened your activity — not from the start of the calendar year. If you opened in May, the 12-month exemption ends in April of the following year.

During this period you also do not need to file quarterly declarations to the SS.

From month 13: how the calculation works

The monthly contribution is calculated based on the income of the previous quarter:

Formula:

Quarterly income × 70% ÷ 3 × 21.4% = monthly contribution

Example: You invoiced €3,000 in Q1 (Jan–Mar).

• Base: €3,000 × 70% = €2,100
• Monthly contribution: €2,100 ÷ 3 × 21.4% = €149.80/month

You pay that contribution in April, May, and June — the following quarter.

The declarations and payments calendar

Quarterly declarations are filed during the entire month of:

• January (for Q4 of the previous year)
• April (for Q1)
• July (for Q2)
• October (for Q3)

Monthly contribution payments are due by the last working day of each month.

Where to pay: Segurança Social Direta website (segurancasocial.pt), MB Way, ATM, or bank branch.

How not to overpay when your income drops

The calculation base uses the previous quarter’s income. If your earnings have fallen significantly, you can update your income declaration so contributions reflect the current reality.

How to do it:

1. Log into Segurança Social Direta
2. Go to your personal area → Income Declaration
3. Update the estimated income for the current quarter

Note: if you declare income lower than actual and the AT later confirms higher figures, you may have differences to settle the following year.

Minimum contribution amount

There is a minimum contribution floor equivalent to 20 IAS (Social Support Index). In 2025, the IAS is €522.50, meaning the minimum monthly contribution is approximately €22.25/month — but only if you have very low income and do not qualify for exemption.

If quarterly income falls below the minimum threshold, contributions are calculated on the applicable minimum.

What Social Security covers

Your contributions give you access to:

• Unemployment benefit (in case of involuntary cessation of activity, after 2 years of contributions)
• Sickness benefit (from the 30th day of sick leave)
• Pension (contributions count towards retirement)
• Parental leave (maternity/paternity benefit)

✅ In summary

• In the first 12 months of activity there is full SS exemption — the period counts from the opening month, not the start of the year.

• From month 13, the contribution is calculated on 70% of the previous quarter’s income — you declare in January, April, July, and October; you pay monthly.

• With FIZ contribution calculations are automatic — the system tracks your income and alerts you when the contribution obligation begins.