Frequently asked questions

Questions and answers

What is deducted from my gross pay in Luxembourg?

Two things, in order. First the social contributions: the capped health, cash-benefit and pension lines (11,55 % of the gross together, up to the ceiling of 13 856,63 €), plus the assurance dépendance at 1,4 %. Then the withholding tax (retenue d’impôt sur les salaires, RTS), charged on the taxable income — the gross less the deductible contributions and the standard allowances. The employee tax credit is subtracted after the tariff. Gross, less contributions, less tax, plus the credit, is your net pay.

How does the tax class (1, 1a, 2) change my net pay?

The same tariff is applied through a different method depending on your class. Class 1 (a single person without children) applies the base tariff directly. Class 2 (married or in a registered partnership, taxed jointly) uses income-splitting: the income is halved, the tariff is applied to the half and the result doubled, which — because the tariff is progressive — usually pulls the household into lower bands and leaves more net. Class 1a (single parents, the recently widowed, people aged 65+) sits in between, with an attenuated tariff that eases lower and middle incomes. So two people on the same gross can take home quite different amounts once the class is counted.

Is the class-1a calculation exact?

Not yet, and we say so rather than hide it. Classes 1 and 2 are modelled exactly. Class 1a uses an approximated formula that we have not yet confirmed against the tax administration’s official online calculator to the cent, so it is flagged in the calculator and is being verified. Until that cross-check is signed off, treat a class-1a result as especially approximate.

What is the assurance dépendance, and why is its base different?

The assurance dépendance is the long-term-care contribution, charged at 1,4 %. It behaves unlike the other lines in three ways. It has no ceiling — it is charged on the full salary however high. Its base is the gross reduced by a fixed abatement of a quarter of the social minimum wage, currently 692,83 € a month. And it does not reduce your income-tax base: the official withholding tables leave it out of the tax computation entirely. The calculator models it as its own line for exactly these reasons.

Do cross-border commuters (frontaliers) see the same withholding?

For the monthly wage-tax withheld at source, broadly yes: a cross-border worker resident in France, Germany or Belgium but employed in Luxembourg has the same RTS deducted from the Luxembourg payslip, on the same tariff and tax class, as a resident on the same gross. Where it differs is afterwards — non-residents face different rules on annual assessment, deductions and how the two countries’ tax systems interact under the relevant treaty. This calculator models the resident case; the monthly Luxembourg withholding is the part that looks the same, but a frontalier’s final position is settled elsewhere.

What is the employee tax credit (crédit d’impôt salarié, CIS)?

It is a tax credit of up to 600,00 € a year that reduces the tax withheld rather than the taxable base. It is applied after the tariff, as a direct cut to the monthly withholding, and it tapers away at higher salaries. Because it comes off the tax itself, it lifts the net pay for lower and middle earners in particular. Related credits — the single-parent credit and the minimum-wage credit — are outside the calculator’s scope and noted, not silently applied.

If tax is withheld every month, why does the annual décompte matter?

Because the monthly RTS is an estimate, not a final bill. It is worked out from your payslip alone, so it can’t see deductions and events that only become clear over the year — extra professional expenses, a mid-year job change, a second earner in the household, and so on. The annual reconciliation — the décompte annuel (form 163) or a full return (form 100) — settles those and can lead to a refund or a top-up. This calculator shows the monthly withholding, which is a close estimate of take-home, not the year-end settlement.

Is there a maximum on social contributions?

Yes, for the health and pension lines. They stop at the contributory ceiling (plafond cotisable), set at five times the social minimum wage — currently 13 856,63 € a month. Above it, those contributions are frozen at the ceiling amount rather than rising with the extra pay. The one exception is the assurance dépendance, which has no ceiling and is charged on the whole salary.

Does Luxembourg take a church tax out of my salary?

No. Luxembourg levies no church tax on salary — nothing of the kind is withheld from your pay. We state that positively because in several neighbouring countries a church or worship contribution is deducted at source, and it is a common assumption to check. It simply does not exist here.

What is the minimum wage in 2026?

The unqualified social minimum wage (salaire social minimum) is 2 771,33 € gross a month for a worker aged 18 or over, reduced pro rata for shorter hours. A higher qualified rate applies to skilled work. The minimum wage tracks the sliding scale, so an index tranche raises it automatically — which is why the 2026 figure is defined by period rather than as a single fixed number.

Are the figures in the calculator correct?

Every rate and band is taken from a named primary source and is the one in force for 2026, but none has been through this site's own review and sign-off. The result is also an estimate rather than the actual tax withheld — for official amounts, check with your employer or the ACD.

The full content of this page is still in preparation and subject to review.