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The assisted online procedure on MyGuichet.lu guides you through the Luxembourg tax return, checks your entries and sends everything electronically to the ACD. Here is the full walkthrough, from LuxTrust login to submission.
No more paper forms: the income tax return (form 100) can be completed and submitted entirely online via MyGuichet.lu, the State's official platform. The assisted procedure asks simple questions, fills in the form for you and flags inconsistencies before submission.
| Item | Detail |
|---|---|
| Login method | LuxTrust product (Token, LuxTrust Mobile app), electronic identity card or eIDAS |
| MyGuichet private space | Created once, in a few minutes |
| Income certificates | Annual salary or pension certificates (provided by the employer or fund) |
| Deduction receipts | Statements for interest, insurance, pension savings, childcare costs, donations |
| File number | Your national identification number (13 digits) and, where applicable, your tax file number |
Your file goes directly to the competent tax office. You can track its status in your space and respond to any requests for additional documents. The tax assessment will reach you by post or electronically; it states the refund or the balance to pay.
Tip: the procedure can be paused and resumed at any time – your entries are saved as a draft. Start early, complete it as your certificates arrive, and submit before 31 December.
