Before you start

Registration at your commune
Employment contract
Residence permit

Step-by-step

1
Understand you're likely taxed at source
Holders of B permits without Swiss settlement are generally subject to Quellensteuer — the employer withholds cantonal, municipal and federal tax directly from salary.
Via employerWho: Your employer
2
Register for AHV social security
Your employer registers you and you receive an AHV number, which doubles as your social security identifier and appears on your insurance card.
Via employerWho: Your employer
3
Check your second-pillar pension deductions
Occupational pension (BVG) contributions are compulsory above an income threshold and are a significant payroll deduction, matched by the employer.
Via employerWho: You
4
File a return if you cross the threshold or want deductions
Above a certain income, or where you have other assets or income, you must file an ordinary assessment. You can also request one to claim deductions such as third-pillar pension contributions.
OnlineWho: YouAnnually
5
Consider third-pillar (3a) contributions
Voluntary private pension contributions up to an annual cap are deductible from taxable income. For anyone filing a return, this is the standard tax-reduction move.
OnlineWho: You

Documents you’ll need

Residence permit
Employment contract
AHV number
Salary certificate (Lohnausweis) issued annually by your employer

Things most newcomers don’t know

Which commune you live in changes your tax bill materially.

Cantonal and municipal multipliers vary significantly, and communes a short train ride apart can differ by several percentage points of income. Unlike most countries, choosing where to live is a genuine tax decision here.

Source: Swiss three-tier taxation system

Taxed at source does not always mean you shouldn't file.

Withholding uses standard assumptions. If you contribute to a third-pillar pension, have significant work expenses or support dependents abroad, requesting an ordinary assessment can produce a refund. Many people never ask.

Source: Cantonal tax office practice

The second-pillar pension is deferred pay, not a tax.

It's a large deduction that makes Swiss net salary look worse than it is — the money is yours, invested, and the employer matches it. Newcomers comparing offers often mis-read it as a levy.

Source: Swiss occupational pension (BVG) framework

Third-pillar 3a contributions are the standard deduction everyone uses.

Voluntary pension contributions up to an annual cap come straight off taxable income. It is the single most common piece of personal tax planning in Switzerland and requires filing a return to benefit.

Source: Federal tax administration