Luxembourg payroll reads an ACD withholding file before net pay hits your IBAN. The fiche de retenue d’impôt is that instruction: tax class, credits and any registered reductions that change monthly withholding.
How do most newcomers receive the card?
Start work so the employer affiliates you with the CCSS and a matricule exists. Guichet states the ACD then issues the multi-annual tax card automatically, on average within thirty working days. Cards go by post to the commune address on file; you cannot collect them at the RTS counter. Activate ACD eDelivery in your MyGuichet private eSpace if you want electronic delivery.
Since 2022, employees do not hand the original card to the employer. The ACD makes an electronic copy available for payroll. Self-employed people taxable in Luxembourg and workers not affiliated as employees may need form 164 for a first request. Temporary agency workers follow a separate flat-rate path Guichet describes, with form 162 F only above a published hourly threshold.
When do you file form 164 R?
Use form 164 R with the RTS office for your commune of residence to request a duplicate, correct errors, move the main card between employers, or register certain deductions and credits so net pay reflects them mid-year. Examples Guichet lists include single-parent credit, flat-rate travel expenses and some special-expense premiums. Renew yearly registrations that expire each tax year.
If the card has not arrived after thirty working days, contact the competent RTS office and tell HR the file is pending. Without a card, Guichet warns withholding uses tax class 1 and cannot fall below 33 percent until correction through the card, an annual adjustment or a tax return. Keep the commune déclaration current so address changes flow correctly: Register address and Paperwork after moving.
Common misconceptions
Assuming you must physically surrender a paper fiche every January fails. Employers pull the electronic ACD copy.
Assuming marriage or a birth fixes withholding overnight without checking the new card also fails. Confirm the updated class and any 164 R credits.
Summary
Let CCSS affiliation trigger the ACD tax card, enable MyGuichet eDelivery if you want PDFs, and use form 164 R only for duplicates, corrections or mid-year reductions. Fix a missing card within the first payroll month so default class-1 withholding does not empty your Kirchberg cash flow.
Sources
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