What Happens if I Have Lived or Worked in Multiple Cantons as an Expat?

As an expat in Switzerland, moving between cantons is common – whether for a new job, lower taxes, or personal reasons. Such a move has concrete implications for taxes, social insurance, and administrative obligations. (As of: 2025)

Important note: This article provides general information. Your individual situation may be complex. If in doubt, consult a tax advisor or the cantonal tax authority of your canton of residence.

Tax implications when changing your canton of residence

Tax liability: What matters is your residence on 31 December

A common misconception: if you move to a different canton during the year, you do not pay taxes proportionally in both cantons. Instead, the so-called key date principle applies (Art. 4b para. 1 LHID):

• What counts is your tax-law residence on 31 December of the tax period.
• The canton where you live at year-end is responsible for the full year's tax assessment – including direct federal tax.
• A split of income between two cantons does not occur with a simple change of residence.

Example: You move from Zurich to Geneva on 1 March. On 31 December, your tax residence is in Geneva. You are assessed for the full year solely in the canton of Geneva. Zurich has no tax claim on your income for that year.

Exceptions: Economic affiliation

A proportional taxation may arise if you have economic affiliation with a canton other than your canton of residence, for example:

• Real estate ownership: Property is always taxed in the canton where it is located (principle of location).
• Self-employment: Profit is taxed at the place of business.
• Permanent establishments in another canton create limited tax liability there.

In these cases, the affected cantons conduct a tax apportionment (Steuerausscheidung) to avoid double taxation (Federal Constitution Art. 127 para. 3).

Withholding tax when changing canton of residence

For expats without a permanent residence permit (Permit C) who are subject to withholding tax:

• The canton of residence is responsible – your employer applies the withholding tax rate of the canton where you live (not where you work).
• When you move, you must notify your employer of your new canton of residence; the employer then adjusts the applicable rate.
• Rates differ significantly by canton: cantons like Zug and Schwyz have low rates, while Geneva, Neuchâtel, and Jura have comparatively high rates.

Subsequent ordinary assessment (NOV)

Expats subject to withholding tax may or must file a full tax return in certain situations. A mandatory NOV is triggered when:

• Gross salary is at least CHF 120'000 per year – filing a tax return then becomes compulsory (for married couples, salaries are not combined for this threshold).
• Additional income is not subject to withholding tax, e.g. rental income or dividends above CHF 1'700.
• Significant taxable assets exist – the threshold varies by canton (e.g. Zurich: CHF 80'000 for single persons).

A voluntary NOV on request is possible, e.g. to claim Pillar 3a deductions or pension fund buy-ins. The application must be submitted by 31 March of the following year.

Important from 2025 onwards: Once submitted, an NOV application is irrevocable – it applies until the end of withholding tax liability. A comparative calculation should therefore be made before applying.

The NOV is conducted in the canton where you are resident at year-end. Withholding taxes already deducted in other cantons are credited interest-free.

When does withholding tax liability end?

Withholding tax no longer applies from the month following one of these events:

• You receive a permanent residence permit (Permit C) – generally after 5 years, or sooner depending on your country of origin.
• You marry a person with Swiss citizenship or a Permit C.

From that point on, you are assessed through the ordinary procedure and must file a tax return each year.

Special rule: Expatriate deductions

Expats who are temporarily posted to Switzerland may be entitled to special deductions under the Expatriates Ordinance (ExpaO):

• Relocation costs (one-time, upon arrival and departure)
• International school fees for children
• Housing cost deduction (in certain cases)

These deductions apply only to expatriates in the strict sense (temporarily posted employees), not to all foreign employees. The competent authority is the cantonal tax office of your canton of residence.

Social insurance and AHV when changing canton

AHV/IV: Canton change has no effect

AHV contributions are managed centrally. Changing cantons has no effect on:

• Your AHV contributions
• Your pension entitlements
• Your insurance certificate

Make sure to always provide your AHV number correctly whenever you change employer.

Pension fund (BVG, 2nd pillar)

When changing employer to a different canton:

• The accumulated capital in your previous pension fund must be transferred to the new pension fund or to a vested benefits account (Freizügigkeitskonto).
• You must actively initiate this transfer within the applicable deadline.
• If the capital remains untransferred, it will be forwarded to the Vested Benefits Foundation BVG (Stiftung Auffangeinrichtung BVG).

Health insurance (KVG)

Moving within Switzerland does not constitute grounds for extraordinary cancellation of your health insurance. The basic insurance is valid nationwide and is not tied to a specific canton. You remain with your current insurer, with one exception:

• Exception: If your insurer operates exclusively in a regional area and is not active in your new canton, you are obliged to switch.

Further important points when changing canton:

• Premiums change when you move canton, as premiums are set by premium regions. You must notify your insurer of the address change.
• A regular insurer change is possible annually as of 31 December, provided the cancellation reaches the insurer by the last working day of November.
• Mid-year changes are only possible in exceptional circumstances (e.g. premium increase, relocation abroad).

Administrative obligations and deadlines

Registration and deregistration with municipalities

The following steps are mandatory when changing canton:

• Deregister from your previous municipality before or at the time of departure.
• Register with your new municipality within 14 days of moving in – failure to do so can result in fines.
• Notify your employer so the withholding tax rate can be adjusted – do this immediately after the move.

Registration with the municipality is the basis for correct tax assessment.

Residence permit

Your residence permit (Permit B or L) generally remains valid when you change canton. However, you must:

• Notify the cantonal migration authorities of the change of address.
• When changing employer to a different canton, check whether a new work permit or notification to the cantonal authorities is required (depending on permit type and nationality).

Practical tips for expats

Common mistakes

• Assuming proportional tax splits: Many believe they pay taxes proportionally in both cantons when moving mid-year. This is incorrect – the residence principle as of 31 December applies.
• Withholding tax rate not adjusted: After moving, the employer must be informed. Otherwise, the wrong rate continues to be applied.
• Incorrect health insurance cancellation: A change of canton alone does not entitle you to extraordinary cancellation. The regular year-end cancellation deadline applies.
• Hasty NOV application: An NOV application is irrevocable once submitted. Always do a comparative calculation first.
• Forgetting to transfer pension fund assets: When changing employer, BVG assets must be actively transferred to the new fund.

Tips

• Documentation: Keep lease agreements, employment contracts, and municipal registration confirmations for all places of residence.
• Check your canton's tax guide (Wegleitung): Each canton publishes its guidelines and information sheets (Merkblätter) online.
• Use cantonal withholding tax differences strategically: Rates vary significantly. A strategically chosen canton of residence can substantially reduce your tax burden.
• Seek professional advice in complex situations: If you have income in multiple cantons, own real estate, or have an international dimension (e.g. foreign income), consult a tax specialist.

Special situations

Working in a different canton from your residence (weekly commuter)

If you work in another canton during the week and return home on weekends, a complex situation may arise:

• The canton of your civil law domicile (where your family lives, your main residence) generally has tax sovereignty.
• The working canton may claim a secondary tax domicile if you regularly stay there overnight.
• In cases of dispute, the SFTA (Swiss Federal Tax Administration / ESTV) decides on the allocation.

Frontier workers (Grenzgänger)

If you work in Switzerland but live abroad, special rules apply:

• The applicable double taxation agreement (DTA) between Switzerland and your country of residence determines where you pay taxes.
• German frontier workers pay a flat 4.5% withholding tax to Switzerland; the remainder is taxed in Germany.
• A change of workplace within Switzerland may affect your frontier worker status – verify this on a case-by-case basis.

Multiple employers in different cantons

If you are simultaneously employed by multiple employers in different cantons:

• Each employer deducts withholding tax using the rate of your canton of residence (not the work canton).
• Total income is combined in an NOV if the CHF 120'000 threshold is exceeded.

Conclusion

Changing canton as an expat is administratively manageable in Switzerland and is often even tax-advantageous. The key principle is residence on 31 December: the taxing canton is determined by where you live at year-end. What matters most is timely registration with the new municipality (within 14 days), informing your employer of the new canton of residence, and understanding the withholding tax rules. For more complex situations – particularly those involving international dimensions or multiple income sources – professional tax advice is strongly recommended.