Quellensteuer vs Regular Assessment: How Swiss Taxes Work for B-Permit Holders

• B permit = tax at source by default; no return, no annual filing.
• CHF 120,000 gross flips you into a mandatory full tax return, permanently while resident.
• Tarifkorrektur = targeted refund claim (3a, pension buy-back, childcare, wrong tariff). Low risk.
• Voluntary NOV = full worldwide assessment, irreversible, and binding for future years.
• Deadline for both: 31 March of the following year.
• Canton and municipality matter more than most newcomers expect — Zug vs Zurich is thousands of francs.

See your own net figure with the salary calculator, compare burdens across cantons at the canton hub, and keep the deadlines in order with the just-arrived checklist.

Your employer applies a cantonal tariff table to your gross monthly salary and deducts the tax before you see the money. The tariff code depends on your household:

Three details that cause most of the confusion:

• The tariff is on gross, monthly. A bonus month can be taxed at a higher effective rate because the table annualises that month. It evens out only if your canton recalculates on an annual basis or if you end up in an assessment.
• The tax rate follows your municipality of residence, not your employer's location, in most constellations — so where you rent matters financially.
• Tariff C is a common trap. If your spouse does not in fact work, or works part-time abroad, the withheld amount can be materially wrong. That is fixable with a Tarifkorrektur.

The mechanics, with cantonal tariff links, are in our Quellensteuer reference guide.

Reach CHF 120,000 of gross employment income in a calendar year and the canton moves you into a mandatory ordinary assessment. What actually changes:

• You file a full Swiss tax return, declaring worldwide income and worldwide wealth (foreign property is not taxed here, but it affects your rate and your wealth-tax base).
• The Quellensteuer already withheld becomes a prepayment; you receive a bill or a refund for the difference.
• You claim the real deductions: Pillar 3a, pension buy-backs, childcare, professional expenses, debt interest, donations, and medical costs above the threshold.
• It continues for every following year while you remain resident, even if your income later drops below CHF 120,000.
• You may owe wealth tax on global assets — bank accounts, securities, crypto, property values. Details: Swiss wealth tax explained.

You are also pulled into an assessment if you have other Swiss income (self-employment, rent, securities above a cantonal threshold) or taxable wealth above the cantonal limit — even at CHF 90,000 salary. First-time filers should read how to file your first Swiss tax return.

A concrete example. A single B-permit holder in Zurich city earns CHF 95,000 gross and pays CHF 7,056 into Pillar 3a. Their marginal rate is roughly 23–25%, so the contribution is worth about CHF 1,600–1,750 in refunded tax. A Tarifkorrektur delivers that refund on the strength of one bank certificate. A voluntary NOV would deliver the same refund, then permanently expose their foreign savings, brokerage account and any inherited property value to Swiss wealth tax and rate-setting — a bad trade unless there are big Swiss deductions on the other side.

How to run the 3a numbers, including the CHF 7,258 employee cap for 2026: the Pillar 3a guide and Pillar 3a for expats.

Same salary, same job, very different outcome. Approximate total income tax (federal + cantonal + municipal, single, no church tax, main city of each canton, 2026 rates):

Treat these as indicative — the exact figure depends on your municipality's multiplier, marital status, children, church tax and deductions. Two practical takeaways:

• The municipality inside a canton matters too. Moving from a high-multiplier city to a nearby low-multiplier village can save four figures a year for the same commute.
• Don't optimise tax alone. Low-tax cantons frequently have higher rents; Zug's premium on housing can eat the tax saving for a single renter. Compare the whole package with the tax calculator and cost of living tool, or side-by-side at the canton comparison hub.

1. January: collect your Pillar 3a contribution certificate, pension buy-back confirmation and childcare invoices for the previous year.
2. January–February: check your December payslip for the annual gross. Above CHF 120,000? Expect a return. Below? Consider a Tarifkorrektur.
3. By 31 March: file the Tarifkorrektur or the voluntary NOV request with your cantonal tax office. Late means lost.
4. Whenever life changes: tell your employer's payroll immediately about marriage, divorce, a child, or a spouse starting or stopping work. The tariff code changes from the following month.
5. When you move canton or municipality: the new rate applies from the following month — and your withholding canton may change entirely.
6. When you get a C permit or marry a Swiss/C-permit holder: Quellensteuer ends and you switch to ordinary assessment with provisional invoices. See the B-to-C upgrade guide.
7. When you leave Switzerland: deregister properly, or you can be assessed as still resident. Details: leaving Switzerland and deregistration.

Tax at source is convenient but it is not accurate. If you contribute to Pillar 3a, buy into your pension fund or pay for childcare, you are almost certainly overpaying — and a Tarifkorrektur by 31 March fixes it without handing your global balance sheet to the Swiss tax office. Cross CHF 120,000 and the choice is made for you, so build the filing habit early and keep every certificate.

Next step: open the free HowToSwiss canton checklist, which sequences your tax, insurance and permit deadlines for your specific canton, and sanity-check your net pay in the salary calculator before your next salary negotiation.