“Taxes vary by canton” is true in Switzerland – but the real question for most employees is which of two very different systems applies to them, and how big the cantonal gap actually is in francs. This page covers both: the difference between withholding tax (Quellensteuer) and filing an ordinary tax return, and what the cantonal differences look like using real, sourced figures rather than vague statements.
Withholding tax (Quellensteuer) vs. the ordinary tax return
Switzerland uses two separate ways of collecting income tax from employees, and which one applies to you depends on your residence permit and civil status – not on how much you earn (with one important exception covered below).
According to the Federal Tax Administration (ESTV), withholding tax applies to foreign nationals who are tax-resident in Switzerland, work as employees, and hold a residence permit other than a C permit (Niederlassungsbewilligung) – and who are not married to (or in a registered partnership with) a Switzerland-resident person who holds a C permit or Swiss citizenship. In practice this covers most B-permit holders and other foreign employees on shorter-term permits. Their employer deducts tax directly from each salary payment, at a rate set by tariff tables that already bake in standard deductions (Tarif A for single people, Tarif B for single-earner married couples, Tarif C for dual-earner married couples, and further codes for special situations).
Everyone else – Swiss citizens, C-permit holders, and anyone married to a Swiss citizen or C-permit holder – goes through the ordinary procedure: filing an annual tax return (Steuererklarung) in which you declare your full income and assets, claim your actual deductions (e.g. real pension contributions, real commuting or childcare costs, real charitable donations), and are then assessed and billed by the cantonal tax authority.
The key practical difference: withholding tax is a flat-rate estimate built into payroll, so it may not match what you would actually owe once your real deductions are counted. The ordinary tax return lets you claim those deductions individually, which is why people under withholding tax sometimes voluntarily request to switch onto the ordinary system (see below).
When ordinary filing becomes compulsory even under withholding tax
Per the ESTV’s official reference on withholding taxation (legislative status 1 January 2025, Art. 89 DBG and Art. 33a StHG), a person otherwise subject to Quellensteuer is moved onto a mandatory subsequent ordinary assessment (nachtragliche ordentliche Veranlagung, NOV) – meaning they must file a full tax return covering their whole income and wealth, not just have tax withheld from salary – in these situations:
- Gross employment income of at least CHF 120,000 in a tax year. This is the federally set threshold (identical rule for direct federal tax and for the cantons/communes under the tax harmonisation law). Notably, for married couples living together, each spouse’s gross employment income is tested separately against the CHF 120,000 mark – their incomes are not added together for this specific test. Once the threshold is reached in a given year, the person stays on the ordinary-assessment track for the rest of their withholding-tax liability, even if their income later drops back below CHF 120,000.
- Additional income not covered by withholding tax, such as self-employment income, alimony/maintenance payments received, orphan’s or widow’s pensions, or income from movable or immovable assets – any of these also triggers a mandatory ordinary assessment for that year, regardless of the CHF 120,000 threshold.
- Obtaining a C permit (Niederlassungsbewilligung) or Swiss citizenship. From the following month, the person leaves withholding tax entirely and is taxed under the ordinary procedure going forward.
- Marrying, or entering a registered partnership with, a person resident in Switzerland who holds a C permit or Swiss citizenship – or having your existing Switzerland-resident spouse/partner later obtain a C permit or Swiss citizenship. In both cases the change to ordinary taxation takes effect from the following month.
Below the CHF 120,000 threshold, and without any of the triggers above, a withholding-tax payer can still voluntarily request a subsequent ordinary assessment each year (by 31 March of the following year) specifically to claim deductions the withholding-tax tariff does not fully account for. And if the circumstances that triggered a move to ordinary taxation later fall away – for example divorce or separation, where the withholding-tax-liable person does not themselves hold a C permit or Swiss citizenship – they revert to withholding tax from the following month, with the year of transition assessed retroactively under the ordinary rules.
How much does the canton actually matter? Real figures
Cantonal and communal tax law is set independently by each of the 26 cantons (on top of a shared federal income tax), and the resulting gap is large. As one illustrative, sourced data point: PwC Switzerland’s “Steuervergleich 2023” tax comparison study (published 13 March 2023), which compares the cantonal capitals, found that on a taxable income of CHF 100,000 for a single taxpayer, the combined effective income tax rate (federal, cantonal and communal) was 11.92% in Zug (the lowest cantonal capital) versus 23.87% in Neuchatel (the highest) – roughly double. At CHF 250,000 taxable income, the same study found 18.69% in Zug versus 35.32% in Lausanne. Looking at top marginal rates specifically, PwC’s study put Zug’s marginal rate at 22.22% against 45.00% in Geneva, the highest among cantonal capitals.
Two caveats worth stating plainly. First, these are 2023-dated figures for cantonal capitals specifically (e.g. the city of Zug, the city of Neuchatel) – communal tax multipliers change from year to year and can differ significantly between a canton’s capital and other municipalities in the same canton, so treat this as illustrative of the scale of the gap rather than a current, personally applicable number. Second, this comparison is for a single taxpayer with no special deductions; married couples, people with children, and people with significant deductible expenses (pension buy-ins, childcare, commuting) will see different effective rates. The one number that will not change: the low-tax cluster (Zug, Schwyz, and other central Swiss cantons) and the higher-tax cluster (Geneva, Vaud, Neuchatel, and Bern) have occupied roughly the same relative positions for years, so the direction of the gap is a stable feature of the Swiss system even as the exact percentages shift annually.
For your own, current situation, the only reliable way to get a real number is to use your canton’s official tax calculator or the ESTV’s tax calculator tool, entering your actual income, canton, commune and family situation – general comparisons like the ones above illustrate the scale of cantonal differences but should not be used as a substitute for a personal calculation.