Understanding Luxembourg salary withholding tax

Luxembourg salary withholding is an advance payment of income tax. The employer calculates it for each pay period from semi-net remuneration and the information on the electronic tax card. It is not necessarily the employee's final annual tax. ^[1]

The employer's role

The employer withholds, reports and pays wage tax to the Direct Tax Administration (ACD). Employers retrieve tax cards electronically and must use the valid class or rate rather than reconstructing an employee's family situation themselves. ^{[2] [3] [4]}

Periodic remuneration

Ordinary monthly salary is periodic remuneration. Withholding starts from taxable gross pay and deducts eligible compulsory health and pension contributions to produce semi-net remuneration. The dependency contribution reduces net pay but not this withholding base. ^{[5] [6]}

For monthly payroll, semi-net remuneration is rounded down to a multiple of €5 and withholding is rounded down to a multiple of €0.10. These rules can create small differences from a simple annual-tax-divided-by-twelve estimate. ^[7]

Bonuses and non-periodic remuneration

A separately paid bonus, thirteenth month or gratuity can be non-periodic remuneration. The employer then uses the specific non-periodic scale with the annual level of ordinary remuneration; applying the ordinary monthly scale directly to the bonus is not correct. ^[8]

Tax class or tax-card rate

For residents, class 1 is the residual class, class 1a covers defined situations, and class 2 generally relates to joint taxation. Class 2 uses income splitting. Non-resident access to class 2 depends on specific conditions and possible tax assimilation. ^{[9] [10] [11]}

Employee tax credits

In 2026, the employee tax credit and employee CO2 tax credit vary by annual gross salary. The minimum-social-wage tax credit can apply to qualifying lower monthly remuneration. Eligibility and the one-credit-across-all-salaries rule still have to be respected. ^{[12] [13]}

Main and additional tax cards

When a person receives several salaries or pensions, the highest and most stable income normally uses the main card. Other income uses an additional card. Published standard additional-card rates are 33% for class 1, 21% for class 1a and 15% for class 2, subject to the applicable procedure. ^[14]

Without a valid card, the employer applies class 1 and withholding cannot be lower than 33% of semi-net remuneration. A missing card should therefore be corrected rather than replaced by an informal estimate. ^{[15] [16]}

Monthly withholding versus annual tax

The annual income-tax tariff and monthly payroll scales have related but different bases, timing and rounding. The Employment Fund surcharge is 7% up to the statutory thresholds and 9% above them. ^{[17] [18]}

A resident or non-resident may be able to request an annual adjustment under the relevant conditions. Some situations require an annual return instead. The correct route depends on the person's complete circumstances. ^{[19] [20]}

Use the gross-to-net calculator, read the payslip guide, or learn how to check and correct a tax card.