Withholding tax Switzerland —
how it works, when TOU matters,
and when a refund is possible
Your first Swiss payslip may show a tax deduction you did not expect — impôt à la source, or withholding tax. It usually covers your employment income tax, but the barème, commune, family situation or TOU decision can change the final result. This guide explains the rules in plain English, with a Vaud focus and cautious notes where individual review is needed.
📋 Contents — Withholding tax Switzerland 2026
- 01What withholding tax is — and what it covers
- 02The barème codes — how your rate is calculated
- 03What it looks like on your payslip
- 04The CHF 120,000 threshold
- 055 common errors that cost you money
- 06Possible refund or tax adjustment — 2 routes
- 07Voluntary ordinary taxation (TOU)
- 08Which deductions you unlock under TOU
- 09Worked example — CHF 8K/month, Lausanne
- 10When permit C changes everything
- 11FAQ — 6 most common questions
What withholding tax is — and what it covers
Swiss withholding tax (impôt à la source — IS, or Quellensteuer in German) is income tax collected at source from the salary of foreign nationals who hold a temporary residence permit and do not yet have settled status in Switzerland.
The mechanism is simple: instead of you paying income tax directly to the cantonal tax authority (AFC) each year, your employer deducts it from your gross salary every month and remits it on your behalf. You receive your net salary after this deduction.
What withholding tax covers: it covers your federal, cantonal and communal income tax. It is the same tax obligation as Swiss nationals pay — collected differently. A permit B holder and a Swiss national earning the same salary in Lausanne owe broadly the same total income tax. The difference is how it’s collected: monthly deduction vs annual return with quarterly instalments.
What withholding tax usually does not cover: wealth tax (impôt sur la fortune), tax on assets above the cantonal threshold, tax on non-wage income (dividends, rental income), and AVS/LPP/LAA social contributions (those are separate payslip deductions).
Key distinction: withholding tax is not an extra tax on foreigners. It is the standard Swiss income tax, collected by the employer rather than paid directly by the taxpayer via an annual return. The total amount is designed to approximate ordinary taxation. The main disadvantage is that the standard barème cannot account for your individual deductions — which is why TOU can be financially beneficial.
| Permit type | Tax system | Annual return |
|---|---|---|
| Permit B (below CHF 120K) | Withholding tax (IS) | Usually not required for salary alone — unless TOU or another trigger applies |
| Permit B (above CHF 120K) | Ordinary subsequent taxation | Generally mandatory for Vaud residents taxed at source |
| Permit C | Ordinary taxation | Annual return usually required |
| Cross-border (Vaud/France) | Special frontier-worker regime, if conditions are met | French taxation and Vaud employer documentation must be checked |
| Swiss national | Ordinary taxation | Annual return under ordinary system |
The barème codes — how your rate is calculated
Your withholding tax rate is determined by a barème — a tax scale code assigned to your profile. Your employer applies it to your taxable salary using the current cantonal instructions. The table below is a practical orientation, not a substitute for the official Vaud scale or payroll calculation.
| Code | Profile | When it is generally used | Key control point |
|---|---|---|---|
| A0 / A | Single person, generally without dependent children | Common starting point for a single permit B/L employee | Check commune, marital status and children |
| B | Married couple where only one spouse exercises gainful activity | One-income married household | Spouse activity changes must be communicated |
| C | Married couple where both spouses exercise gainful activity | Dual-income married household | The spouse’s effective income can justify a recalculation in some cases |
| H | Single person living with dependent children or supported persons | Single-parent situations where the conditions are met | Family status and dependent-child evidence matter |
| G / I-J-K | Special scales, for example replacement income or certain pension/prevident benefits | Usually handled by insurers, pension institutions, unemployment funds or other payers | Do not apply these as ordinary salary scales without checking the payer and income type |
How rates are set: the AFC publishes annual barème tables for each canton. Within each code (A, B, C, H and special scales), the rate varies by taxable salary, canton/commune and the annual instructions (because communal tax component differs by municipality). Your employer’s payroll software should apply the current year’s AFC tables automatically. You can verify your rate using the AFC’s online calculator — or we verify it for you.
Important — your barème must be updated when your situation changes: marriage, divorce, birth of a child, moving to a new commune, spouse starting or stopping work — all require an immediate update to your barème code. Your employer relies on you to notify them. If the code stays wrong for a full year, you will either overpay (refundable via rectification by 31 March) or underpay (additional assessment from AFC).
What it looks like on your payslip — sample breakdown
Here is what a typical Swiss payslip looks like for a permit B holder in Lausanne, earning CHF 8,000 gross per month, single, barème A0. Every line explained in plain English.
Notice that withholding tax (IS) is the largest single deduction after social contributions — typically exceeding LPP and AANP combined. It is also the deduction most likely to be incorrect and most likely to yield a refund.
Important — IS is NOT on permit C payslips: if you hold permit C, your payslip shows NO withholding tax line. You receive your gross salary minus social contributions only. This is correct — you pay income tax separately via quarterly instalments and an annual return. Many new C permit holders mistakenly think their employer forgot to deduct tax.
The CHF 120,000 threshold — the number that changes your system
Since the 2021 federal harmonisation reform, this threshold applies uniformly across all Swiss cantons. It is the single most important number for permit B holders.
Withholding tax — default system
- Tax deducted monthly by employer — no annual return is usually required unless another filing trigger applies
- Withholding tax usually covers income tax on salary when no TOU or other filing trigger applies
- You may be able to request TOU by the applicable deadline to claim individual deductions
- Since the 2021 reform, a voluntary TOU request can have continuing effects and should be simulated before filing
- May still need ordinary taxation if taxable assets exist or exceed the relevant cantonal threshold
- May need ordinary taxation if you receive income not taxed at source, such as rental income, certain pensions, securities income or self-employment income
- Marriage to a Swiss national or a C permit holder can change the tax procedure
Ordinary taxation — mandatory
- Ordinary taxation is mandatory — no choice
- Employer continues withholding IS during the year
- AFC issues an annual assessment based on your declared income and deductions
- Withholding amounts credited against the final assessment — refund or additional payment
- Full access to all deductions: 3rd pillar, LPP, childcare, home office, mortgage interest
- Worldwide income and assets must be declared
- AFC correspondence in French — we explain every assessment in English
Other filing triggers can apply even below CHF 120,000: income not taxed at source, taxable assets, changes in permit or family status, marriage to a Swiss national or C permit holder, or a request from the tax authority. The exact trigger should be checked for the canton, tax year and documents.
5 withholding tax mistakes — that cost Swiss expats real money
These errors are avoidable — but only if you know to look for them. Each one can mean overpaying, missing a procedural deadline or facing an unexpected additional assessment from the tax authority.
Wrong barème code — never updated after life changes
Marriage, divorce, birth of a child, change of commune — any of these should immediately trigger a barème code update by your employer. In practice, HR doesn’t always know. A single person accidentally taxed at barème C (married, one income) can overpay materially, depending on salary, commune and the correct scale.
Refund via rectification — deadline 31 March3rd pillar paid — but never deducted from tax
Many expats contribute to a 3rd pillar account (up to CHF 7,258/year) without realising the deduction requires either TOU or ordinary taxation. Withholding tax barèmes do not account for personal 3rd pillar contributions. You pay the contribution but do not obtain the tax effect unless the deduction is considered through TOU or ordinary taxation.
Possible route: TOU by the applicable deadline, after simulationCrossing CHF 120,000 with a bonus — and not filing
A base salary of CHF 105,000 + a CHF 20,000 year-end bonus = CHF 125,000 gross. This triggers mandatory ordinary taxation for that entire year. Not filing generates an AFC assessment with interest, late filing penalties and a risk of increased scrutiny for subsequent years.
Mandatory return — do not wait for a reminderForeign assets not declared
A UK pension, a US 401(k), a French bank account, a property in Germany — all must be declared in Switzerland if you are on ordinary taxation (TOU or C permit). With AEOI (automatic exchange of information) now operating between Switzerland and 100+ countries, undeclared foreign assets carry real detection risk and a 10-year statute of limitations.
Retroactive assessment and interest riskTOU filed without simulating the full impact
Since the 2021 reform, a voluntary TOU request can have continuing effects for Swiss-resident taxpayers. Some people file TOU for one deduction, then discover that future ordinary assessments may be less favourable when deductions decrease or family circumstances change.
Simulate several years before filing · We run the modelRefund or additional tax — two routes, one decision
If the monthly withholding was calculated with the wrong barème, or if a full ordinary assessment is needed to claim deductions or declare additional elements, there are two distinct legal mechanisms. The result can be a refund or an additional balance. In Vaud, the key deadline is generally 31 March of the following year, subject to case-specific procedures.
If your withholding tax rate was incorrect — wrong barème code, wrong commune, wrong family status — you can file a demande de rectification with the AFC Vaud. The AFC recalculates at the correct rate for the full year and may issue a refund for an overpaid amount, or an additional assessment if the corrected calculation is higher.
This is the right route when the withholding rate itself was wrong — not when the rate was correct but you want to claim additional deductions.
✓ What to do File a rectification request with AFC Vaud before 31 March of the following year. Provide your salary certificate (Form 11), correct barème code justification and commune confirmation.If your barème rate is correct but you have individual deductions that are not captured in the standard barème — 3rd pillar (CHF 7,258/year), LPP buybacks, childcare costs (up to CHF 25,000/year), home office, mortgage interest — you request TOU. The AFC assesses your full year based on your actual income and eligible deductions. If the result is lower than what withholding already covered, a refund may be issued.
Key warning since 2021: For Swiss-resident taxpayers in Vaud, a voluntary TOU request cannot be treated like a simple deduction claim: once filed in the correct form and deadline, it generally continues until the end of the withholding-tax liability. We simulate the multi-year impact before recommending.
⚠ Continuing effects since the 2021 reform ✓ Deadline: 31 MarchCan you use both routes? Yes — you can file a rectification for a barème error AND request TOU for deductions in the same year. In practice, if the barème was wrong AND you have significant deductions, TOU absorbs both: the ordinary assessment recalculates tax from scratch using the correct rate and all your deductions. The result is the net refund or additional payment. Deadline: 31 March in both cases.
Voluntary ordinary taxation (TOU) — the complete decision guide
Simulate first — always
Calculate your withholding tax paid (from your salary certificate). Calculate your ordinary tax after all deductions. If ordinary tax is lower, TOU may save money. If ordinary tax is higher, TOU can create an additional payment. The simulation should use the full household data, not only the 3a certificate.
Consider the continuing effects over several years
Model the benefit not just for this year, but across your expected remaining period under withholding tax. If deductions decrease, the continuing ordinary-assessment route may become less favourable.
File by 31 March
Submit the TOU request to the AFC Vaud with your salary certificate, 3rd pillar certificate, childcare receipts and other deduction documentation. In Vaud, the usual deadline is 31 March of the year following the tax year; departure from Switzerland or special procedures can change the practical timing.
Receive assessment and refund
The AFC processes the return and issues a formal assessment. The withholding amounts already deducted during the year are credited. If assessment is lower: refund issued. If higher: additional payment due.
| TOU question | Answer |
|---|---|
| Who can request TOU? | A permit B/L taxpayer resident in Vaud who is taxed at source, does not already fall under mandatory TOU and meets the cantonal conditions |
| Deadline | Generally 31 March of the year following the tax year; check special cases such as departure from Switzerland |
| Is it continuing? | For Swiss-resident taxpayers in Vaud, a voluntary TOU request generally cannot be withdrawn and usually continues until withholding-tax liability ends |
| What if my deductions decrease next year? | Future returns may still be required; the result can be lower or higher than withholding tax |
| What happens if I get permit C? | Ordinary taxation already applies — TOU becomes moot. You file the return as usual |
| Can I revert to withholding? | Usually no for Swiss-resident taxpayers once a valid voluntary TOU request has been filed; non-resident quasi-resident cases work differently |
| Does TOU apply to the full year? | Yes — the AFC assesses the entire calendar year, not just the months after the request |
Deductions you unlock under TOU — Vaud 2026
The barème already includes standard lump-sum deductions for professional expenses and certain insurance costs. What it cannot capture are your individual circumstances — here is what TOU unlocks.
3rd pillar (pilier 3a)
Contributions to a Swiss 3rd pillar pension account are fully deductible from taxable income. Maximum CHF 7,258/year for employees. Must be paid before 31 December. Available to all employees earning a Swiss salary.
Up to CHF 7,258/yearLPP voluntary buybacks
Voluntary contributions to fill gaps in your occupational pension (LPP) are 100% deductible — no ceiling. Particularly impactful for those with international career gaps. Requires a pension gap certificate from your LPP fund.
100% deductible — no ceilingChildcare costs
External childcare costs (crèche, daycare, certified childminder, after-school care) are deductible up to CHF 25,000/year per child. Both parents must be employed or in education. Receipts required.
Up to CHF 25,000/year per childHome office expenses
If you regularly work from home and have no dedicated workspace at your employer’s premises, you can deduct home office costs above the standard professional expense lump sum (~CHF 2,400/year). Based on days worked at home.
Above standard lump sumProfessional training costs
Continuing education and training directly related to your current employment is deductible up to CHF 12,900/year (federal 2026). Course fees, books, training travel costs. Must be professionally motivated.
Up to CHF 12,900/yearMortgage interest
If you own property in Switzerland, all mortgage interest is deductible. Note: you must also declare the imputed rental value (valeur locative) as income. Net impact depends on property value and interest rate.
100% of interest paidAlso deductible under TOU: Swiss social contributions (AVS, LPP employee share — already in barème lump sum but actual amount may differ) · LaMal health insurance premiums above the barème lump sum (up to CHF 2,600/year for singles in Vaud) · Transport to work above lump sum · Meal costs if canteen not available · Foreign pension and asset declarations (required, not a deduction but compliance obligation).
Worked example — CHF 8,000/month, Lausanne, single, permit B
A concrete simulation for a realistic profile — showing the financial difference between staying on withholding tax vs requesting TOU. Profile: Marie, 36, single, no children, Lausanne, permit B.
| Item | Option A — Withholding only | Option B — TOU requested |
|---|---|---|
| Annual gross salary | CHF 96,000 | CHF 96,000 |
| 3rd pillar contribution (paid Dec) | CHF 7,258 paid — NOT deducted from tax | CHF 7,258 — fully deductible |
| Home office (est. 2 days/week) | Standard lump sum only | −CHF 1,800 additional deduction |
| Professional training (course fee) | — | −CHF 1,200 |
| Taxable income | ≈ CHF 96,000 (minus barème lump sums) | ≈ CHF 85,742 (after all deductions) |
| Income tax paid | IS barème A0 ~17% → CHF 16,320/year | Ordinary tax at Lausanne rates → ≈ CHF 12,800 |
| Annual saving | — | ≈ CHF 3,520/year |
| Over 5 years (until permit C) | — | ≈ CHF 17,600 total |
✓ TOU appears favourable in this illustrative case: CHF 3,520/year estimated saving, primarily driven by the 3rd pillar deduction (CHF 7,258) she was already paying. The continuing filing effect appears manageable because she expects to remain in Switzerland for several years. This remains an illustrative simulation, not a promise of refund.
When TOU would be less clear for Marie: if she had no 3rd pillar, no home office and no training costs, her TOU saving would be minimal (perhaps CHF 300–500/year). Combined with the continuing ordinary-assessment route, this might not justify the effort — especially if she plans to leave Switzerland within 18 months.
Permit C — when withholding tax disappears
When you receive permit C (after 5 years for EU/EFTA nationals, 10 years for others), withholding tax stops automatically. The change is significant — and requires preparation.
Payslip changes immediately
From the month following permit C, your employer stops deducting IS. Your take-home pay increases by the former IS amount. This feels like a raise — but it is not. You owe that income tax later via the AFC annual assessment.
⚠ Set up a tax provision accountAnnual return becomes the ordinary system
From permit C, you file a tax return every year — same as Swiss nationals. The AFC issues quarterly provisional instalments. Underpaying instalments can generate interest; rates and deadlines change by tax year and authority. Filing deadlines and extensions should be checked for the relevant canton and mandate.
File annually under ordinary taxationFull deductions — immediately, no request
Individual deductions are handled through the ordinary tax return from the first permit C assessment: 3rd pillar, LPP buybacks, childcare, professional expenses, debt interest and other eligible items. No TOU request is needed because ordinary taxation is the default route.
Full deductions — no request neededSmart planning before permit C: in your final year of permit B, maximise the 3rd pillar contribution (CHF 7,258) and consider a large LPP buyback — these deductions reduce your last withholding tax assessment and generate a refund. Also consider: the transition year’s return covers a mixed year (part IS, part ordinary) and requires careful handling. We prepare this first mixed-year return and walk you through every figure in English.
Withholding tax Switzerland — 6 most common questions
I just received my first Swiss payslip — why is so much deducted?
For a permit B holder in Vaud, a typical gross salary of CHF 8,000/month might leave you with CHF 5,600–5,800 net — a deduction of about 27–30%. The main components are: social contributions (AVS 5.3%, LPP ~4–9%, AANP ~1%, AC 1.1%, IJM ~0.8%) which total 12–17% depending on your age and LPP plan, and withholding tax (IS) which adds another 12–20% depending on your barème. The combined deduction can reach 30% for higher salaries.
Key perspective: this is not an extra tax on foreigners. It is the standard Swiss income tax collection mechanism for permit B holders. The social contributions build your Swiss pension and unemployment rights. The withholding tax covers your income tax obligation. Swiss nationals and C permit holders are generally taxed through a different collection mechanism: an ordinary tax return and instalments or assessments.
My barème code on the payslip looks wrong — what do I do?
First, verify the correct barème for your situation: A0 (single, no children), B (married, both working), C (married, single income), H (single parent). Check your current code on the payslip header or the IS deduction line.
If it’s wrong: notify your HR department immediately — they should update for the current and future months. For past months in the same year: file a demande de rectification with the AFC Vaud by 31 March of the following year. The AFC recalculates the full year at the correct rate and issues a refund or additional assessment accordingly. We handle this filing for you — all AFC communication in French internally, results explained to you in English.
Should I request TOU if I contribute to a 3rd pillar?
Possibly, but simulate first. The 3rd pillar deduction (up to CHF 7,258/year for employees affiliated with a pension fund in 2026) is deductible under ordinary taxation, but it is not handled as a simple annual correction of the withholding barème. If you contribute the maximum, TOU can produce a refund in some Vaud cases; it can also be neutral or unfavourable depending on the full household situation.
The critical point since the 2021 reform is the continuing effect of a valid voluntary TOU request for Swiss-resident taxpayers. If you might leave Switzerland soon, if your deductions are small, or if your household situation may change, run the numbers before filing.
I have a UK pension and a US 401(k) — do I need to declare them?
Yes — if you are on ordinary taxation (TOU or permit C), you must declare worldwide assets and income, including foreign pensions and investments. The double taxation treaties between Switzerland and the UK, US, and other countries determine whether the income is actually taxed in Switzerland, abroad, or both with credit mechanisms.
- UK pension: accrued rights must be declared as wealth; pension income when received may be exempt under the UK-Switzerland DTA
- US 401(k): declared as an asset; income treatment depends on the US-Switzerland DTA and whether distributions have started
- Foreign bank accounts: all balances declared as wealth; interest income declared
Risk: Switzerland has AEOI (automatic exchange of information) with 100+ countries including the UK and US. Undeclared foreign assets carry a 10-year retroactive assessment risk. We assess the correct treaty application for your specific asset mix.
My employer told me they don’t do TOU — is that possible?
Yes — TOU has nothing to do with your employer. The TOU request is filed directly by you (or a fiduciary on your behalf) with the AFC Vaud. Your employer’s only role is to provide the annual salary certificate (Form 11), usually early in the following year. Once you file TOU, the AFC handles the assessment independently of your employer. Your employer continues applying withholding tax during the year as usual — the TOU process reconciles this at year-end.
What happens if I leave Switzerland before the TOU filing deadline?
If you leave Switzerland before 31 March (the TOU deadline for the previous year’s income), you can still file TOU from abroad — you have the right to recover overpaid withholding tax regardless of where you are at the time of filing. You will need your salary certificate from your Swiss employer and documentation of your deductions. We can handle the AFC filing on your behalf remotely.
If you leave Switzerland permanently, this also terminates the TOU Continuing effect — the commitment to file every year is tied to your residence in Switzerland and your permit B status. Leaving Switzerland cancels both the permit and the ongoing TOU obligation.
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Withholding tax — assessed and optimised in English
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