Living in Thoiry and working in Switzerland: Geneva or eight cantons, depending on the canton of employment regime

How the taxation works

Which regime applies depends on the Swiss canton where you work, not on the town you live in and not on the crossing nearest your home. Two people in the same town working in different cantons fall under different regimes.

Thoiry sits in a department bordering both canton Geneva and a canton under the 1983 agreement, so both regimes are genuinely possible for its residents. Both are described below — the one that applies to you is set by your employer's canton.

If you live in Thoiry and work in canton Geneva, the 1973 cross-border agreement applies: the Swiss employer withholds tax at source under barème A0. Geneva retrocedes 3.5% of the cross-border payroll mass to France, which grants a full tax credit — no double taxation.

If you live in Thoiry and work in one of the eight cantons under the 1983 agreement (here Vaud, Neuchâtel, Jura or Valais), France taxes you: it taxes the full Swiss income via the annual return, with a flat-rate 10% allowance and the French progressive scale. Switzerland receives a 4.5% compensation from France in return. For the reference profile the annual tax is about €8,993.

Source: ge.ch, "Barèmes 2026 impôt source" (pubblicato 2025-12-05); accord frontalieri Genève 1973 (rsGE D 1 45) — impots.gouv.fr, brochure ufficiale "Déclaration des revenus 2025" (barème + forfait 10% + décote); accord frontalieri 1983

Useful reading

The calculator implements the Italy-Switzerland cross-border regime (Ticino withholding tax plus Italian IRPEF with its allowance). It does not reproduce the regime described on this page, so its result does not apply to residents here.

Compared with the nearest towns

Within 15 km of Thoiry there are 6 towns with a page on this site: Saint-Genis-Pouilly, Prevessin-Moens, Ornex, Cessy, Gex and Saint-Julien-en-Genevois.

Across this group the distance to the border runs from 3 km (Saint-Julien-en-Genevois) to 12 km (Gex).

Thoiry sits at 8 km: 6 of 7 counting from the lowest.

Of 7 comparable towns, this page ranks 6 on indicative monthly rent, at €1,183.

Ahead in the ranking, in order: Cessy, Gex, Saint-Julien-en-Genevois, Saint-Genis-Pouilly and Ornex.

Further down the ranking: Prevessin-Moens.

just ahead is Ornex (€1,150)

just behind is Prevessin-Moens (€1,232)

Across the group the highest value is €1,232 (Prevessin-Moens) and the lowest €1,039 (Cessy).

Of 7 comparable towns, this page ranks 5 on population, at 6,569.

Ahead in the ranking, in order: Saint-Julien-en-Genevois, Saint-Genis-Pouilly, Gex and Prevessin-Moens.

Further down the ranking: Cessy and Ornex.

just ahead is Prevessin-Moens (9,153)

just behind is Cessy (5,832)

Across the group the highest value is 16,222 (Saint-Julien-en-Genevois) and the lowest 5,082 (Ornex).

Of 20 comparable towns, this page ranks 13 on population, at 6,569.

Ahead in the ranking, in order: Annemasse, Pontarlier, Saint-Julien-en-Genevois, Saint-Genis-Pouilly, Gex, Gaillard, Divonne-les-Bains, Ville-la-Grand, Prevessin-Moens, Reignier-Esery, Cranves-Sales and Morteau.

Further down the ranking: Ambilly, Cessy, Delle, Cruseilles, Villers-le-Lac, Ornex and Hauts de Bienne.

just ahead is Morteau (6,953)

just behind is Ambilly (6,355)

Across the group the highest value is 37,628 (Annemasse) and the lowest 5,032 (Hauts de Bienne).

Of 20 comparable towns, this page ranks 12 on the distance to the border, at 8 km.

Ahead in the ranking, in order: Gaillard, Ambilly, Saint-Julien-en-Genevois, Cessy, Delle, Saint-Genis-Pouilly, Ornex, Prevessin-Moens, Annemasse, Ville-la-Grand and Divonne-les-Bains.

Further down the ranking: Reignier-Esery, Villers-le-Lac, Gex, Hauts de Bienne, Pontarlier, Cruseilles, Morteau and Cranves-Sales.

just ahead is Divonne-les-Bains (6 km)

just behind is Reignier-Esery (10 km)

Across the group the highest value is 19 km (Cranves-Sales) and the lowest 2 km (Gaillard).

Of 20 comparable towns, this page ranks 18 on indicative monthly rent, at €1,183.

Ahead in the ranking, in order: Delle, Hauts de Bienne, Pontarlier, Villers-le-Lac, Morteau, Ville-la-Grand, Gaillard, Cruseilles, Reignier-Esery, Cessy, Annemasse, Cranves-Sales, Gex, Ambilly, Saint-Julien-en-Genevois, Saint-Genis-Pouilly and Ornex.

Further down the ranking: Prevessin-Moens and Divonne-les-Bains.

just ahead is Ornex (€1,150)

just behind is Prevessin-Moens (€1,232)

Across the group the highest value is €1,392 (Divonne-les-Bains) and the lowest €533 (Delle).

Of 7 comparable towns, this page ranks 5 on population in Ain, at 6,569.

Ahead in the ranking, in order: Saint-Genis-Pouilly, Gex, Divonne-les-Bains and Prevessin-Moens.

Further down the ranking: Cessy and Ornex.

just ahead is Prevessin-Moens (9,153)

just behind is Cessy (5,832)

Across the group the highest value is 14,432 (Saint-Genis-Pouilly) and the lowest 5,082 (Ornex).

Of 7 comparable towns, this page ranks 6 on distance in Ain, at 8 km.

Ahead in the ranking, in order: Cessy, Saint-Genis-Pouilly, Ornex, Prevessin-Moens and Divonne-les-Bains.

Further down the ranking: Gex.

just ahead is Divonne-les-Bains (6 km)

just behind is Gex (12 km)

Across the group the highest value is 12 km (Gex) and the lowest 4 km (Cessy).

Of 7 comparable towns, this page ranks 5 on rent in Ain, at €1,183.

Ahead in the ranking, in order: Cessy, Gex, Saint-Genis-Pouilly and Ornex.

Further down the ranking: Prevessin-Moens and Divonne-les-Bains.

just ahead is Ornex (€1,150)

just behind is Prevessin-Moens (€1,232)

Across the group the highest value is €1,392 (Divonne-les-Bains) and the lowest €1,039 (Cessy).

The Meyrin / CERN crossing also serves Saint-Genis-Pouilly.

The six nearest towns use these reference crossings: Meyrin / CERN, Ferney-Voltaire / Grand-Saconnex, Sauverny and Perly (Perly-Certoux).

The dataset links the Ain department to canton Geneva through the Meyrin / CERN crossing; the canton where you work, not this route, determines the tax regime.

Straight-line distances computed from the town-centre coordinates in our dataset. Road distance to the nearest crossing, population and indicative rent from the French municipal dataset (INSEE). Rent estimate based on 664 DGALN/DHUP observations.

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