Swiss tax for Brits: tax at source, Zurich's rates and the lump-sum deal that Zurich scrapped

Most Brits in Zurich first meet Swiss tax as a line on their payslip called Quellensteuer. It looks like PAYE, but the rules about when you must, or should, file a full return are where the money is.

The short version

• If you work for a Swiss employer and don't have a C permit or Swiss citizenship (or a spouse with either), tax is deducted at source from your pay [1].
• Earn CHF 120,000 (about £109,300) or more gross a year and you're moved to a compulsory ordinary assessment with a full tax return [1].
• Below that, you can apply for an ordinary assessment yourself, but the deadline is 31 March of the following year, and you can't go back [1].
• Your total bill depends on three layers: federal, canton and commune. The canton of Zurich's multiplier is 95% for 2026 and 2027 [2].
• Lump-sum taxation exists in Swiss federal law for wealthy foreigners who don't work here, but Zurich's voters abolished it for cantonal and municipal tax in 2009 [3][4].

Tax at source: who pays it

The canton of Zurich's tax office sets out the rule: you're subject to tax at source if you live in the canton, don't hold a C permit or Swiss citizenship, and work for an employer based in Switzerland [1]. That covers almost every Brit who arrived after Brexit on an L or B permit. If you marry a Swiss citizen or a C permit holder, tax at source normally stops; when you get your own C permit it stops too, and you file ordinary returns from then on [1].

Your employer deducts the tax monthly using a tariff code that reflects your marital status, children, whether a spouse also works and church membership. The rate already bakes in federal, cantonal and municipal tax plus standard deductions. Check the code on your first payslip: a single person wrongly coded, or a missing child, is an easy and expensive slip.

What it doesn't include is anything personal. Pillar 3a payments, buy-ins to your pension fund, childcare costs and big commuting or training costs are only fully reflected if you're assessed properly.

When a full return is compulsory, and when it's worth asking for

Compulsory ordinary assessment applies if any one of these is true [1]:

For couples, the two salaries aren't added together to reach the CHF 120,000 line [1]. Once you're in ordinary assessment, you stay in it for as long as you're subject to tax at source; the tax already deducted is credited against the final bill.

If none of those triggers applies, you can still ask for a subsequent ordinary assessment (nachträgliche ordentliche Veranlagung). The application has to reach the Kantonales Steueramt by 31 March of the year after the tax year [1]. It usually pays off if you:

1. Pay the maximum into a Pillar 3a (CHF 7,258, about £6,610, in 2026 for employees with a pension fund) [8].
2. Make a voluntary buy-in to your pension fund.
3. Have high childcare, training or commuting costs.

The catch: once you've asked, you're filing full returns every year until tax at source ends, and you'll be declaring worldwide wealth, including your UK ISA and the flat in Leeds. Run the numbers on the canton's online calculator first, and if your affairs span both countries, a tax adviser who knows both can check your situation.

How Zurich's rates stack up

Think of it as a layer cake:

1. Direct federal tax, the same everywhere in Switzerland. On high incomes it's capped at a flat 11.5% of your whole taxable income [9].
2. Cantonal tax: a basic tax from the canton's scale, multiplied by the canton's Steuerfuss. The Kantonsrat cut it from 98% to 95% for 2026 and 2027 [2].
3. Municipal tax: the same basic tax multiplied by your Gemeinde's Steuerfuss. The City of Zurich has kept its multiplier at 119%, and the city council proposed leaving it there for 2027 [10], while many communes along the lake set theirs lower.
4. Church tax, only if you're registered with a recognised church (Reformed, Roman Catholic or Christian Catholic). Plenty of Brits tick "none" when they register at the Kreisbüro.

So moving 10 km down the lake can make a real difference to your bill, though rents in the low-tax communes eat into the saving. Each year you also owe wealth tax on net assets above the tax-free amount, at rates far lower than income tax but with no UK equivalent at all.

Lump-sum taxation: what it is and why Zurich said no

Lump-sum taxation, or taxation according to expenditure (Besteuerung nach dem Aufwand), lets a foreign national be taxed on their worldwide living costs rather than their actual income and wealth. Under federal law you qualify only if you aren't Swiss, you're becoming fully taxable in Switzerland for the first time or after at least ten years away, and you don't work in Switzerland [3]. For direct federal tax the minimum tax base is CHF 400,000 (about £364,400) a year [3], and cantons set their own minimums for cantonal tax.

In the canton of Zurich it's off the table. Zurich's voters abolished lump-sum taxation for cantonal and municipal taxes in a popular vote on 8 February 2009 [4]. Federal tax can still be assessed this way, but without the cantonal and municipal part there's little point. Other cantons still offer the regime with their own minimums, so wealthy retirees who don't plan to work sometimes look elsewhere; our guide to Geneva as the alternative to Zurich compares the two cities more widely.

Don't assume the UK side takes care of itself either. The UK–Switzerland convention has no special article for lump-sum taxpayers, so whether you count as Swiss resident for treaty purposes, and whether UK income gets relief, turns on the general residence rules in Article 4 [5]. That's specialist territory: take advice from someone who knows both systems before deciding.

Leaving Switzerland and the UK side

When you leave, tell your Gemeinde and your employer; your final tax-at-source month or a final return closes things off. Lump sums from your pension fund or Pillar 3a are taxed separately from your other income, at a special rate [7]. Under the UK–Swiss convention a lump sum from a Swiss scheme is taxable only in Switzerland [5], so the Swiss deduction is usually the end of it. More on that in our guide to Pillar 2 and Pillar 3a.

On the UK side, the FCDO reminds you that the UK and Switzerland have a double taxation agreement and to contact the Swiss Federal Tax Administration or your cantonal tax office about relief [6]. For the big picture on leaving HMRC behind and your State Pension, see Swiss taxes for Brits.

Questions about tariff codes and the 31 March deadline come up every spring in our community group for Brits in Switzerland, so you won't be the only one with a payslip and a puzzled look.

Pound conversions use the Bank of England spot rate of 5 November 2026 (£1 = CHF 1.0976). Tax is general information, not advice.

Sources

1. Kanton Zürich Steueramt: Quellensteuerpflichtige Personen
2. SRF: Im Kanton Zürich sinken die Steuern (15 December 2025)
3. Kanton Freiburg: Besteuerung nach dem Aufwand
4. Kanton Zürich: Regierungsratsbeschluss 1776/2010 on lump-sum taxation
5. GOV.UK (HMRC): 1977 UK–Switzerland Double Taxation Convention as amended by the 2017 Protocol
6. GOV.UK (FCDO): Living in Switzerland (updated 24 December 2025)
7. ch.ch: Retirement income in Switzerland
8. Federal Social Insurance Office: Die dritte Säule (10 February 2026)
9. Federal Tax Administration: Steuertarife direkte Bundessteuer natürliche Personen 2026 (Form. 58c) (6 January 2026)
10. Stadt Zürich: Budget 2027 media release (September 2026)

Keep reading

• Swiss taxes for Brits: the UK link and your State Pension
• Swiss permits for Brits: L, B and C permits and the quotas
• Geneva as the alternative to Zurich
• Double taxation agreements and reliefs