Telework Tracker
Blog

You asked. Here are the answers.

Guides shaped as questions Belgian cross-border workers in Luxembourg actually ask. Each page has a markdown mirror for AIs.

The tax threshold

· 8 min

The 34-day rule: what the June 2026 circular clarifies

Physical presence, any fraction of a day counts as a full day, training included. The official count, point by point.

 · 6 min

The 34-day threshold, explained clearly

What actually counts for a Belgian cross-border worker in Luxembourg — and why crossing it changes everything.

 · 7 min

Proration: why your ceiling is not 34 days

Part-time, mid-year start: the formula, eight worked examples, and the calculation traps.

 · 8 min

Exceeding 34 days: what actually happens

Taxation from day one, dual filing, boxes 1250/2250, burden of proof.

Social security

· 9 min

The two thresholds of cross-border telework: 34 days, and 50%

EU framework agreement, A1 document, the 25% rule: the counter almost nobody watches.

Count and prove

· 5 min

How to count days outside Luxembourg

Half-days, business trips, leave: what enters the counter — and what does not.

 · 5 min

The report your employer can sign

Why structured proof matters the day the tax office asks.