Quellensteuer (Swiss source tax)
is Switzerland’s tax-at-source regime: employers withhold income tax directly from the salaries of foreign employees without a C permit (and of cross-border commuters), remitting it to the canton monthly. Rates depend on canton, income, marital status and children, and replace the ordinary filing process for most earners below CHF 120,000.
How does Quellensteuer work in 2026?
The employer applies the cantonal tariff table to each pay run: tariff codes reflect family status and church-tax liability, and rates rise progressively with monthly income. The withheld amount covers federal, cantonal and communal income tax in one deduction.
Above CHF 120,000 of annual gross, a subsequent ordinary assessment is mandatory: the employee files a return, and the source tax becomes a prepayment. Below the threshold, employees can request a voluntary assessment (deadline 31 March) to claim deductions — pillar 3a, commuting, training — that tariffs ignore.
| Situation | Treatment |
|---|---|
| B/L permit employee, income < CHF 120k | Source tax final unless voluntary assessment requested |
| Income ≥ CHF 120k | Mandatory ordinary assessment; source tax credited |
| G permit cross-border commuters | Source tax with treaty-specific rules (e.g. France, Germany, Italy) |
| C permit holders / Swiss nationals | No source tax — ordinary filing |
What must employers get right?
Employer duties concentrate in three places:
- Correct tariff code: family status changes (marriage, children, spouse’s income) change the code mid-year — payroll must capture them promptly.
- Cantonal allocation: the rate follows the employee’s canton of residence (or work canton for commuters), and cantons differ substantially.
- Timely remittance and statements: monthly or quarterly settlement with the cantonal authority, plus commission handling and year-end certificates.
Source tax is one of the operational reasons foreign employers use Swiss payrolling or an Employer of Record: the tariff mechanics, cantonal variations and treaty rules for commuters sit with a provider that runs them daily.
Employer duties and budgeting
For budgeting, remember Quellensteuer is the employee’s tax but the employer’s liability: errors in tariff codes or remittance fall on the company, and corrections run through cantonal offices with interest. Rate differences between cantons also shift net-pay outcomes for identical gross salaries — worth modelling before setting assignment packages. Access Financial runs source-tax payroll across all 26 cantons — request a Swiss net-pay simulation.
FAQ
Who pays Quellensteuer in Switzerland?
Foreign employees without a C permit — typically B and L permit holders — and G-permit cross-border commuters have income tax withheld at source by their employer. Swiss citizens and C-permit holders pay through the ordinary annual assessment instead. The employer carries the withholding and remittance obligation in all source-tax cases.
Can source-taxed employees claim deductions back?
Yes. Below CHF 120,000, filing a voluntary subsequent assessment by 31 March of the following year lets the employee claim deductions the tariff ignores — pillar 3a contributions, commuting and meal costs, further training, childcare. Whether it pays off depends on canton and personal situation; once requested, the assessment obligation continues in later years.
What is the CHF 120,000 rule?
When annual gross employment income reaches CHF 120,000, Swiss law requires a mandatory subsequent ordinary assessment: the employee files a full tax return, the authority computes definitive tax, and the source tax already withheld counts as a prepayment. Below the threshold, withholding is generally final unless a voluntary assessment is requested.