Personal taxation · Luxembourg
MyGuichet tax return: access, signatures and filing
Filing through MyGuichet means choosing the procedure for the right year, checking your eligibility, completing the file, then signing and submitting it. A completed PDF or a saved draft is not proof of filing.
Financial Services Luxembourg · Licensed accountant · Head of the firm: Mickaël LOC. Editorial update: .
Choose the procedure for the relevant year
The date you log in does not determine the income year. For the 2026 campaign covering 2025 income, use the 2025 procedure and supporting documents. The assistant's conditions should be checked on the official page for the campaign.
Some situations may require another official filing method. Do not work around a condition by removing income or a person from the file to make the questionnaire work.
Personal access, couples and mandates
Prepare the authentication and signature methods indicated by the official procedure. Where a couple is concerned, check which signatures are expected. If a third party files, check the mandate required; Form 101 is provided for under the conditions of the procedure.
Do not give your personal access codes to a service provider. An engagement to prepare the return and an engagement to file it on the client's behalf must be distinguished.
Before you submit
- Compare the summary with the certificates and schedules.
- Check that each document is legible and attached to the right year and the right taxpayer.
- Review the options and the relevant contact details.
- Complete the signatures, then the actual submission.
- Keep the final summary and the acknowledgement of receipt.
Fictitious example: a draft still pending
A taxpayer uploads supporting documents and saves the entries. Until the signature and submission steps are completed, the filing may remain incomplete. Documents being present in the account therefore do not prove that the Luxembourg Inland Revenue (ACD) has received the return.
If you run into difficulty, identify the blocking step and the message displayed, without publishing a screenshot containing tax data. Contact the official helpdesk and the relevant tax office if a deadline is approaching.
The firm’s other tax engagements
Depending on your situation, the firm also handles tax, VAT and payroll, the regularisation of late tax filings and assistance during a tax audit. Fees are listed in the firm’s fee grid.
Official sources and scope
The rules apply to the year and profile concerned. Examples flagged as fictitious explain a method; they are not an individual validation. The documents and options of your file are covered by a separate engagement.