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Cross-border worker Belgium · Luxembourg
34 days outside Luxembourg.
Every other day, proven.
The BE–LU tax tolerance allows a limited number of days worked outside Luxembourg. What gets challenged afterwards is the opposite: your presence in Luxembourg on all the other days. The app counts the former day by day and keeps, for the latter, the receipt, the tank of fuel or the toll that proves them.
An example of a year under way: 12 days already taken, 22 still available. No percentage — an allowance is spent in whole days, so it is read in whole days.
The rule
What the app counts, and what it does not
34
Days outside Luxembourg
Every day marked “Outside Luxembourg” uses one. That is the only thing that eats into this allowance.
26
Days off
Counted separately, on their own allowance. A day off is not a day worked elsewhere: it does not touch the 34.
11
Luxembourg public holidays
The employer's calendar, not the one where you live: the Belgian 21 July and 11 November are ordinary working days here.
Both allowances are editable year by year, from the calendar. Counting and proving are two separate things: only a day marked “Outside Luxembourg” eats into the allowance, and it is the days worked in Luxembourg that need proof — attaching a file never uses anything up.
What is inside
Four screens, nothing more
Year calendar
Twelve grids, one colour per status, a red outline on the days whose proof is still missing. Below, the list of what is left to settle.
In Luxembourg Outside Luxembourg Day off Public holiday (LU)
Scan a document
The document is filed on the date printed on it. Automatic reading is optional and off by default: without it, the screen simply asks for the date. A code on screen lets you photograph it from your phone.
Read-only links
An address to give your accountant or the tax office: read-only, limited to one year if you want, with an expiry date and a button to revoke it.
PDF export
Every working day of the year, with the status, the note, the name of the proof of presence in Luxembourg or the word MISSING, and the counters in the footer.
Integrity
A register that cannot be rewritten
Every deposit and every attestation is written into a hash chain, sealed every day by an independent timestamping authority (RFC 3161). The proof that your register existed as it stands on a given date does not rest on our word — it verifies without us.
Pricing
The register is free, the machine is what you pay for
Everything a human does with the register costs nothing per use, so it costs nothing at all. Pro covers the two things that really do cost money: the automatic reading of documents, and more space.
Free
0 € forever
Everything needed to keep the register day to day and defend it when the day comes.
- The year calendar and the day statuses
- Counters and quotas
- Proofs uploaded by hand
- 1 proof a day
- PDF export of the yearly file
- Accountant viewing: link or dedicated workspace
- Sending from the phone by QR code
- 1 GB of space for proof files
- 10 automatic readings offered to try
- Your data, exportable and revocable
Pro
39 € / year
The machine on top: automatic reading of documents, and space for years of evidence.
- Everything in the free plan
- eIDAS qualified seal: the register's date certified by a trust service provider, accuracy presumed
- No daily limit on uploads
- Automatic reading of photographed receipts
- 600 readings a year
- 5 GB of space for proof files
Prices include VAT, cancel any time.
Your documents
A till receipt says a lot about you
It carries your name, the shops you visited and the dates. So the files stay on the server hosting the app, served to your account only, and nothing is sent anywhere else by default.
Automatic reading of documents is the only moment a file leaves the server. It is switched on explicitly, switched off just as fast, and the app works entirely without it.
Getting started
An account, an email address, and an empty calendar with fresh counters. Every account has its own days, allowances and files.
Questions
What people ask before they start
How do you count the days you work outside Luxembourg?
Day by day, on a calendar. Weekends and Luxembourg public holidays are already there; you only mark the days that are out of the ordinary, and the year's counter follows along. A day marked “Outside Luxembourg” uses one of the allowance, a day off does not — the two counts are kept apart.
How many days may I work outside Luxembourg?
Today 34 days a year for a Belgian, French or German resident, each under their own convention with Luxembourg. The ceiling was raised on different dates per country, so an older year keeps its own: the app opens each year with that year's figure, editable afterwards. These are its defaults, not tax advice.
Which proof do you need to keep?
Whatever proves presence in Luxembourg on a given day: a till receipt, a tank of fuel, a restaurant bill, a toll, a travel ticket. You attach the file to the day in question — photographed from the computer, or from your phone by scanning a code on the screen — and the whole year comes out as a PDF, day by day, with the counters in the footer.
Is the app free?
The register is free and stays free: the calendar, the statuses, the counters, your proof files, the PDF export, the read-only links and the phone upload. The Pro subscription only covers the two things that really cost money — the automatic reading of photographed documents, and more space.
Can my accountant look at the file?
Yes, in two ways. A read-only link: an address limited to one year if you wish, with an expiry date and a button to revoke it — whoever opens it sees the calendar and the proofs without an account. Or a standing access: your accountant invites you from their workspace, you accept while signed in to your account, and you withdraw the access whenever you want from the Sharing page. Both are free.
Do my documents stay private?
The files stay on the server that hosts the app and are served only to your account and to the links you created. Automatic reading is the only moment a document leaves, and it is optional and off by default. Deleting the account erases the register, the files and the links immediately, from the Account page.
The rules themselves are explained in the blog, each with the official text it comes from and the date it was last checked.