The 34-day threshold, explained clearly

The number you see everywhere — 34 days — is the tolerance often cited for days worked outside Luxembourg by a Belgian cross-border worker. This is the general idea, not your case. It is not tax advice.

No. Below the threshold, the usual frame stays Luxembourg taxation of employment income. Beyond it, days worked outside Luxembourg can trigger taxation in the country of residence — and not only on the excess. The risk is not “one day too many”. It is a regime switch.

• Proration — part-time, mid-year start: not always raw 34.
• Day type — telework, travel, leave: not everything counts the same way.
• Proof — a rough spreadsheet rarely holds when someone asks for history.

1. Your personal threshold.
2. Every outside-Luxembourg day that may count — including a fraction (= 1 day).
3. An alert before the edge.
4. An exportable history.

Telework Tracker does that tracking. It does not replace a tax adviser.