Germany → Switzerland: commuters, weekly stayers and full movers

Why this corridor is different. Most migration corridors have one population. DE→CH has three, with completely different tax outcomes: the Grenzgänger who lives in Germany and crosses daily, the Wochenaufenthalter who rents a weekday room in Zurich and drives home on Fridays, and the full mover who relocates family and life. People slide between these categories without noticing — and each slide changes which country taxes your salary, whether Germany's exit tax fires, and how long German inheritance tax follows you. This Guide maps all three, because the questions arriving through this corridor mix them constantly.

Who it's for. German-resident employees and business owners working in or moving to Switzerland, and their advisers. It is a rulebook and a trap-map, not advice on your facts — this corridor combines a bilateral treaty with special Grenzgänger provisions, German anti-emigration rules, and 26 cantonal tax systems. Have someone who knows both ends check your plan.

Part 2 — The Wochenaufenthalter: the accidental Swiss resident

Rent a weekday studio in Basel, keep the family home in Freiburg, drive home Fridays — the classic Wochenaufenthalter. Two systems now both have a claim:

• Switzerland will usually treat you as resident for withholding (Quellensteuer) because you dwell there during the week.
• Germany still treats you as resident because your family home (Wohnsitz / centre of vital interests) is there.

The treaty tie-breaker (Art. 4) then decides — and with spouse and children in Germany, the centre of vital interests almost always keeps German residence, with Switzerland taxing Swiss workdays and Germany applying exemption-with-progression. You are not a Grenzgänger (too many non-return nights), and you have not escaped German taxation — you've landed in the split-taxation middle: Swiss tax on the salary, German progression effect on everything else, two filing obligations.

The single most common error on this corridor is believing the weekday flat alone moved your tax life to Switzerland. It doesn't — the family home anchors you. Which leads to Part 3.

Part 4 — The Swiss side: what you're moving into

4.1 The ordinary system

• Three layers — federal, cantonal, communal — and the canton/commune choice moves your total burden by a factor of ~2: the reason "moving to Switzerland" really means "moving to Zug, Schwyz, Lucerne… or Geneva".
• Quellensteuer: foreign employees on B permits are taxed by withholding; above roughly CHF 120k annual salary a mandatory ordinary assessment follows (and below it you can often opt in — worth modelling, since deductions differ).
• Wealth tax: every canton levies an annual net-wealth tax (rates are per-mille, cantonal). Trivial next to German income tax for most, material for large liquid estates.
• No capital gains tax on private movable assets: sell shares privately and pay nothing — the corridor's headline attraction, with one sharp edge: trade too actively (leverage, short holding periods, volume) and the assessment flips you to professional securities dealer, making gains fully taxable income plus social contributions. Real-estate gains are always taxed (cantonal Grundstückgewinnsteuer).
• Mandatory health insurance (KVG) within 3 months — a cost-of-living line German movers consistently underestimate; there is no employer-funded system.

4.2 Lump-sum taxation (Pauschalbesteuerung / expenditure-based taxation)

For foreigners who take Swiss residence and do not work in Switzerland: taxation on expenditure rather than income — negotiated with the canton, floored by federal minimums (taxable base of at least ~7× annual housing cost and a six-figure minimum base; several cantons, including Zurich, have abolished the regime, while Vaud, Valais, Geneva, Ticino and others keep it). Two German-specific warnings: Germany treats lump-sum-taxed movers as resident in a privileged regime, which switches on §2 AStG's ten-year extended liability (3.2), and the DBA's own Art. 4(6) can deny treaty benefits to lump-sum taxpayers who aren't taxed on all Swiss-and-German income at ordinary rates ("modified lump-sum" fixes this — negotiate it explicitly).

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Part 5 — Sequenced checklist

Before anything is signed

1. Classify yourself honestly: commuter, weekly stayer, or mover — and re-test after any home office change, family move, or new flat.
2. Shareholders ≥1%: model the §6 AStG exit tax now; decide sell / restructure / instalment / temporary-absence route before giving notice on the German home.
3. Choose canton and commune with a real comparison — income, wealth tax, and (for non-working movers) whether lump-sum is available and worth its German side-effects.

The move 4. Deregister (Abmeldung) in Germany only when the facts genuinely support it; keep the evidence of the new centre of life (lease, family, schools, clubs, insurance). 5. File the German departure-year return; expect exemption-with-progression mechanics for the split year and the §50d attestations your employer needs. 6. Register in the commune, sort the B permit, health insurance within 90 days, AHV number.

After landing 7. Grenzgänger/Wochenaufenthalter: set up the non-return-day log and the Gre-certificate renewal as annual rituals. 8. Remember the two shadows: 5 years of German gift/inheritance exposure, up to 10 years of §2 AStG extended liability if German economic interests remain. Calendar both end-dates — large gifts and restructurings queue behind them. 9. Watch the professional-trader line if your wealth is in markets, and file the Swiss return with the wealth-tax schedule complete — undeclared accounts are what break residence arguments retroactively.

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The trap list

Trap	Why it bites
The 61st non-return day	Ends Grenzgänger status for the whole year — taxing rights and withholding recomputed.
Weekday flat mistaken for a tax move	Family home in Germany keeps German residence via the tie-breaker; you get two filing lives, not one Swiss one.
Leaving with a GmbH stake ≥1%	§6 AStG deemed-disposal tax at departure, instalments at best. Discovered after the move, it's just a bill.
Gifting within 5 years of leaving	German gift tax on worldwide assets via §2 ErbStG — the Swiss cantonal exemption is irrelevant.
Lump-sum regime chosen naively	Triggers §2 AStG extended liability and can void treaty protection unless the modified form is negotiated.
Active trading of the "tax-free" portfolio	Professional-dealer reclassification: gains become income plus AHV.
Home office drift	Shifts workday geography, Grenzgänger counts, and A1 social-security position — all three, silently.

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Sources (primary, verify current figures)

Doppelbesteuerungsabkommen Deutschland–Schweiz, Art. 4, 15, 15a and 2023 Änderungsprotokoll (home-office provisions); BMF administrative guidance on Grenzgänger and non-return days; Außensteuergesetz §2 (erweiterte beschränkte Steuerpflicht) and §6 (Wegzugsbesteuerung, as amended by ATADUmsG 2022); ErbStG §2 (erweiterte unbeschränkte Steuerpflicht); EU–Switzerland Agreement on the Free Movement of Persons + 2023 Framework Agreement on cross-border telework (social security); Swiss Federal Tax Administration (estv.admin.ch): Quellensteuer, expenditure-based taxation circulars, professional securities dealer criteria (Kreisschreiben 36); cantonal tax administrations for rates and Grundstückgewinnsteuer.

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Built for the OpenAccountants migration desk. DE→CH is the corridor where pre-departure planning carries the most tax per hour of work — the exit tax, the five-year gift shadow and the Grenzgänger day-count are all decided before or at the move, not after. Put a named accountant on each end.