Social security contributions for the self-employed in Luxembourg: a worked example, minimum, ceiling and recalculation

Self-employed: you pay both shares

An employee sees their share of contributions on the payslip; the employer pays the other share. A self-employed person pays everything.

Guichet.lu puts it simply: self-employed persons personally pay their social security contributions, both the employee and the employer share, in proportion to their professional income. That is why the amount often surprises new freelancers who were used to seeing only half of the bill on their payslip.

This applies to sole traders (craftspeople, traders, liberal professions…) and, under conditions, to some company directors, for instance a managing partner who holds more than 25% of a SARL and the business permit. Our CCSS guide for the self-employed covers these cases in detail; this article focuses on the calculation.

Eight days to register, four compulsory insurances

According to the CCSS, anyone working on their own account must register their activity with the Joint Social Security Centre no later than 8 days after starting, using the entry declaration for self-employed workers. A company director treated as self-employed uses the employee entry form instead.

Once registered, the self-employed person must contribute to four insurances: health, pension, accident and long-term care. They may also join the Mutualité des employeurs, which pays a replacement income in case of illness; that membership is optional.

The contribution base: your professional income, between a minimum and a ceiling

Contributions are calculated on professional income: commercial profit, profit from a liberal profession, or a managing partner’s remuneration. If you have several activities, all professional income is added together.

For health, pension and accident insurance, the base has a minimum, the social minimum wage, and a maximum, 5 times that amount. The long-term care contribution has neither a minimum nor a maximum. Since 1 June 2026, the monthly amounts published by the CCSS are:

The 2026 rates: pension is the largest item

The CCSS publishes contribution rates every year. In 2026, pension is by far the highest rate: 17%. Because the self-employed pay both shares, these full rates apply.

The accident rate is multiplied by a bonus-malus factor set by the Accident Insurance Association. Rates for the optional Mutualité des employeurs depend on the contribution class.

Worked example: €4,000 of income a month

Léa, a self-employed consultant, expects a professional income of €4,000 a month: between the minimum and the ceiling, so her base is her income.

Long-term care and accident insurance come on top; they follow their own rules (no minimum or maximum for long-term care, a bonus-malus factor for accident). Zuelen’s estimator includes them to give a complete estimate.

• If Léa earned only €1,500 a month, pension, health and accident would still be calculated on the €2,771.33 minimum, unless she asked the CCSS to reduce the pension contribution.
• If she earned €15,000 a month, those three branches would stop at the €13,856.63 ceiling: income above it does not generate contributions for them.

Try the CCSS contribution estimator with your own income.

Provisional first, recalculated later

The exact income for a year is only known once the tax authority (Administration des contributions directes, ACD) issues the tax assessment. Until then, the CCSS charges provisional contributions: on the social minimum wage for a first registration (unless a more realistic estimate is available), then on the last known income.

When the ACD reports the final income, contributions are recalculated. If your actual income is much higher than the provisional base, the difference appears on the next account statement and is in principle payable within ten days of its issue; the CCSS can grant a payment plan if needed.

A monthly bill, ten days to pay

The self-employed receive a monthly account statement from the CCSS, with a two-month lag: March contributions appear on the May statement. The balance must be paid within 10 days of issue, even if you dispute it; otherwise late-payment interest of 0.6% per full month applies.

1. 1
   Set aside each month an amount based on your actual income, not only on the provisional base.
2. 2
   Regularly compare your income with the base used by the CCSS and request an adjustment if the gap grows.
3. 3
   Consider direct debit so you never miss the deadline.

To organise your books around these deadlines, see also our article on accounting for the self-employed.