Tipping, honestly
Service charge is built into every menu price in Luxembourg by law, so tipping is genuinely optional. Locals round up the bill: a 27.50 euro lunch becomes 30, a 92 euro dinner becomes 100. For exceptional service at a nicer place, 5 to 10% is generous. Nobody calculates 18% and nobody expects it. Leaving nothing is not rude if service was ordinary.
For taxis, round up to the next euro or two. Hotel porters get 1 to 2 euros per bag at higher-end places like Le Royal or Sofitel Kirchberg. Housekeeping tips are uncommon. Hairdressers and spa therapists appreciate a 2 to 5 euro tip. Tour guides on paid walking tours: 5 euros per person is standard.
The etiquette that actually matters
Greetings are non-negotiable. You say "Moien" or "Bonjour" when entering a shop, boarding a small bus, or approaching a counter, and "Merci, äddi" when leaving. Skipping this reads as rude even if your French is excellent. In restaurants, wait to be seated except in casual brasseries.
Punctuality is taken seriously, especially for dinner reservations and business. Ten minutes late needs a message. Volume is another quiet rule: Luxembourgers are soft-spoken in public, and loud phone calls on the tram at Kirchberg will get looks. Dress is smart-casual for city dinners; shorts and flip-flops read as tourist even in July.
Questions, answered
Do I tip on card or cash?
Either works. If tipping on card, tell the server the total including tip before they run it, since most terminals do not prompt for a tip line.
Is it rude to speak only English?
Not at all, but open with "Moien" or "Bonjour" first. Switching to English after a local greeting feels polite; leading with English feels presumptuous.
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