LetzDays Open

Cross-border workers · the 34-day rule

Your days outside Luxembourg, counted and documented.

Live in France, Belgium or Germany and work for a Luxembourg employer? Log where you work each day, stay under the yearly limit, and download a sealed report you can show.

Open in the browser
  • No password
  • Works offline
  • No ads, no trackers

How it works

  1. Log it in one tap

    Tap where you worked: office, home, elsewhere (business trip, training). Your usual week is planned ahead; you only confirm it.

  2. See the impact at once

    You see straight away whether the day counts toward your tax limit, and your share of work abroad for social security is updated: two rules, two calculations.

  3. Know what's left

    Days used, days left and the pace you can keep until 31 December, with your country's limit. For France it's adjusted for part-time work or a partial year.

  4. Plan ahead

    Plan your next days: the app warns you if they would take you over the limit, and points out days you forgot to log.

  5. A history anyone can check

    Download a sealed PDF with every confirmed day, your notes and proof. Keep it with your tax papers or send it to payroll.

  6. Check against your employer

    Load the CSV export from the HR or time-tracking tool: the app lists the days that don't match your log.

Your data stays yours

Encrypted vault

Payslips and tax notices are encrypted on your phone with your own passphrase. Nobody else can open them.

Export or delete

Download all your data or delete your account at any time, from the app.

No third parties

No ads, no trackers, no requests to other sites. No GPS location stored.

How your record is protected

Dated by the server

The server records when it received each day. Your phone's clock isn't used.

Sealed and timestamped

Every report is signed and dated by an independent timestamping service. Any later change shows.

Verifiable by anyone

Your employer or the tax office can check a report in seconds, without an account.

What LetzDays shows: when you logged each day, and that the report hasn't been changed since. It doesn't show where you were: whether the days are right is still up to you.

Technical details: Ed25519 signature, RFC 3161 timestamp, SHA-256 fingerprint.

Common questions

What counts as a day outside Luxembourg?

Any day you work from home or anywhere else outside Luxembourg, including training and business trips. Even part of a day counts as a whole day. Holidays, sick days, public holidays and weekends don't count. For Germany, less than 30 minutes of work outside Luxembourg doesn't count.

What happens if I go over the limit?

Your home country can then tax your salary for every day you worked outside Luxembourg that year, starting from the first one, not only the extra days. For Germany, the salary is split by the time you actually worked there. Talk to your payroll before you reach the limit.

How is my limit calculated?

34 days a year for residents of France, Belgium and Germany. France reduces it for part-time work and for a job held only part of the year, rounded down. You can also enter your payroll's figure in Settings.

What is the social security limit?

It's a separate rule from tax. If more than 25% of your working time is abroad, you may have to move to your home country's social security. The limit is 49% if your employer signed the EU teleworking agreement for you.

Is this tax advice?

No. The app keeps an honest record and applies the published rules. Check unusual cases with your payroll or an adviser.

On your phone

Install LetzDays on your home screen: it opens like an app, even offline, without an app store.