Tens of thousands of people work in Germany but sleep in France, the Netherlands, Belgium, Luxembourg, Austria or Switzerland — and just as many commute the other way. Cross-border commuters (Grenzgänger) are taxed and insured under special treaty rules — but their German dismissal protection is exactly the same as that of any colleague living in Germany. This article maps the social-security and tax basics country by country, explains how home-office days can quietly shift your position, and covers what matters most on this site: what happens when a Grenzgänger is dismissed.
Who counts as a Grenzgänger?
The term is used loosely, but two definitions matter:
- Social security: a frontier worker is someone who works in one member state, resides in another, and returns home at least once a week (Art. 1(f) Regulation (EC) 883/2004).
- Tax: each double-taxation treaty (DBA) defines its own Grenzgänger or border-zone concept — and several treaties (Netherlands, Belgium, Luxembourg) have none at all.
You can be a frontier worker for social security without qualifying for a tax Grenzgänger regime, and vice versa. The two systems must always be checked separately.
Social security: the state-of-work principle
The default is simple: you are insured where you work (Art. 11(3)(a) Regulation (EC) 883/2004). A resident of Strasbourg employed in Kehl pays into the German system — health, pension, unemployment, accident and care insurance — exactly like a German resident.
Telework complicates this. If you work a substantial part (25% or more) of your time from your residence state, coverage flips to the residence state (Art. 13 Regulation (EC) 883/2004) — meaning your German employer would suddenly owe, say, French or Dutch contributions. Since July 2023, the Multilateral Framework Agreement on cross-border telework allows up to 49.99% home-state telework while keeping the state-of-work coverage, but only on application (documented by an A1 certificate) and only between signatory states — which include Germany and all its neighbours. If you negotiate more home-office days, insist that the social-security side is formally sorted, not assumed.
Tax: the treaty map
Where your salary is taxed depends on the DBA between Germany and your residence state. We summarise for orientation only — coordinate the specifics with a tax advisor.
Switzerland: Grenzgänger status and the 60-day rule
The German-Swiss treaty has a genuine Grenzgänger regime (Art. 15a DBA Germany-Switzerland): if you return home regularly, your residence state taxes your salary, while the work state may withhold at source up to 4.5% (credited at home). The status is lost if you fail to return home on more than 60 working days per year for professional reasons — the famous 60-day rule. Losing status shifts taxation substantially, so the day count is worth tracking carefully.
France: the border-zone rule
Employees who live and work within defined border zones and commute home daily are taxed in their residence state (Art. 13(5) DBA Germany-France), on the basis of an annual Grenzgänger certificate. A tolerance of 45 non-return days per year applies; exceed it and taxation flips to the work state.
Austria: the border-zone rule
Similar architecture: residence-state taxation for those living and working within roughly 30 km of the border (Art. 15(6) DBA Germany-Austria). Since the 2023 protocol, home-office days in the border zone no longer endanger the status — a deliberate post-COVID modernisation.
Netherlands, Belgium, Luxembourg: no special border regime
These treaties have no Grenzgänger rule. The standard allocation applies: salary is taxed where the work is physically performed, subject to the 183-day rule for short assignments. Specific pacts soften the edges — Germany and Luxembourg apply a de-minimis tolerance (34 days per year since 2024) under which days worked outside the work state stay taxable there; with the Netherlands and Belgium, days worked from home are in principle taxable in the residence state, which leads directly to the next point.
Home office: the post-COVID shift
During the pandemic, mutual agreements froze the tax status quo for home-office days; those agreements expired in mid-2022. Since then, the pre-COVID logic applies again in the non-border-regime treaties: every day worked from your home abroad is, in principle, a day taxable in your residence state. A Dutch resident working three days in Düsseldorf and two days in Venlo has a salary split between two tax systems — with two payroll consequences and an annual reconciliation. The trend in treaty policy is toward tolerance thresholds, but until your specific treaty has one, assume home-office days move both tax (potentially) and, above the thresholds described earlier, social security. Get both checked before you change your weekly pattern.
Dismissal: your protection is German
Here is the part many Grenzgänger underestimate. If your place of work is in Germany, German employment law governs the relationship (Art. 8 Rome I Regulation) — your residence is irrelevant. That means:
- The Kündigungsschutzgesetz applies under the normal conditions (more than six months of service, more than ten employees in the Betrieb) — see our article on the Kündigungsschutzklage.
- The 21-day deadline for challenging a dismissal applies without any allowance for foreign residence.
- Severance dynamics follow the usual German mechanics — see our severance-calculation article.
- German labour courts are competent: you can sue where the work is habitually performed (Art. 21 Brussels Ia Regulation; for Switzerland, the parallel rules of the Lugano Convention), with domestic venue at the habitual place of work (§ 48(1a) ArbGG).
Worked example
A French national living in Strasbourg, employed for 8 years as a production engineer in Offenburg. Salary: €5,800 gross per month (€69,600 per year). Both home and workplace lie within the treaty border zones; she commutes daily and holds the annual Grenzgänger certificate, so her salary is taxed in France while German social-security contributions are deducted in Germany.
Her employer restructures and dismisses her with a severance offer of 0.5 × monthly salary × years of service = €23,200. Our review finds a flawed social selection (Sozialauswahl): a comparable engineer with 2 years of tenure was retained. A Kündigungsschutzklage is filed with the Arbeitsgericht Freiburg within 21 days — her Strasbourg residence changes nothing about competence or deadline.
Settlement at the Gütetermin: severance at a factor of 1.0 — €46,400 — plus garden leave through the 6-month notice period and a Grade-1 reference. Two cross-border specifics remained: her unemployment registration ran through France Travail (residence-state principle), and the question of where the severance is taxed — under the border-zone regime generally in France, but the allocation deserved a tax advisor’s confirmation before the settlement was finalised. Both were built into the settlement timeline.
Frequently asked questions
I live abroad and work in Germany. Which court do I sue in if I am dismissed?
The German Arbeitsgericht at your habitual place of work (Art. 21 Brussels Ia Regulation, § 48(1a) ArbGG). Proceedings are in German, but you do not need to live in Germany — or usually even appear in person at the first hearing — to run the case effectively.
Does the 21-day deadline really apply to me the same way?
Yes, fully. It runs from receipt (Zugang) of the dismissal letter. Cross-border postal delays do not extend it — if a letter reaches your foreign address late, the deadline runs from when it actually arrives, so document the envelope and delivery date.
Where do I get unemployment benefits after a German job ends?
As a frontier worker who returned home at least weekly: in your state of residence (Art. 65 Regulation (EC) 883/2004). Your German employment and contribution periods are taken into account there. Register immediately after the dismissal takes effect — residence-state deadlines can be short.
My employer wants me to work two days per week from home abroad. Risky?
Two days out of five is 40% — above the 25% default threshold, so your social security would flip to your residence state unless the telework Framework Agreement is applied for (it covers up to 49.99%). Tax-wise, in the non-border-regime treaties those home days may become taxable in your residence state. Both are manageable, but only if formally arranged.
Is my German severance taxed in Germany or in my residence state?
It depends on the treaty and your commuter status; severance for past employment is often allocated to the former work state, but border regimes can override this. This is a genuine tax-advisor question — raise it before the settlement is signed, because the gross/net difference can change what factor you should accept.
Do I count toward the ten-employee threshold if I work partly abroad?
What matters is the German Betrieb you are assigned to. A Grenzgänger assigned to a German operation counts like any other employee there — and enjoys KSchG protection on the same terms.