For UK nationals weighing a European base after the abolition of non-dom in April 2025, Switzerland is the closest like-for-like replacement on offer — a written, ruling-based tax cap negotiated with a specific canton, paired with a stable AAA jurisdiction and a real path to a top-five passport. The mechanism is the lump-sum taxation regime (forfait fiscal in French, Pauschalbesteuerung in German), under which qualifying foreign nationals are taxed on Swiss living expenditure rather than worldwide income, with a federal minimum tax base of CHF 435,000 (2026) and cantonal floors that push real annual bills into the CHF 600,000–1,000,000+ range. The structural catch on the UK route is twofold: the UK-Switzerland double-tax treaty contains a treaty-benefit restriction for forfait holders that often forces a “modified forfait” election to preserve treaty relief, and the new FA 2025 long-term residence rule keeps worldwide UK inheritance tax in scope for up to 10 years after departure. This guide walks the full UK→Switzerland sequence — Statutory Residence Test, temporary non-residence trap, the modified-forfait treaty mechanic, the canton selection question, and the B-permit application.
The Tax Delta at a Glance
| United Kingdom (current) | Switzerland — lump-sum regime (after move) | |
|---|---|---|
| Personal income tax | 20% / 40% / 45% (England & Wales); up to 48% (Scotland) | Negotiated lump-sum on Swiss expenditure; federal minimum CHF 435,000 base (2026), cantonal floors apply |
| Capital gains tax | 18% basic / 24% higher (post-Oct 2024 Budget) | 0% on private movable assets (incl. crypto held privately) outside professional-trader status; absorbed in lump-sum |
| Dividend tax | 8.75% / 33.75% / 39.35% above £500 allowance | Foreign dividends absorbed in lump-sum; Swiss-source 35% WHT recoverable subject to control calculation |
| Crypto / stock options | 18%–24% CGT or marginal income tax | 0% as private capital gain; held as wealth on cantonal wealth-tax base |
| Wealth / inheritance | 40% IHT above £325K nil-rate band; long-term-residence basis from April 2025 | No federal IHT; cantonal IHT generally 0% to spouse and direct descendants; cantonal wealth tax 0.1–1% of net worth |
| Worldwide vs territorial | Worldwide on UK residents | Standard regime is worldwide; lump-sum is expenditure-based, so worldwide income is not assessed |
| Effective rate (typical post-exit founder, CHF 10M annual passive income) | ~42–47% combined income + dividend + NIC | ~5–10% all-in on a CHF 600K–1M annual lump-sum |
For UK leavers whose income is dominated by capital gains, foreign dividends, foreign rental, or post-exit founder liquidity above roughly CHF 5M/year, the UK→Switzerland forfait route delivers a deep, predictable, ruling-based tax cap. Below that threshold, Monaco’s headline 0% or Italy’s flat €200K regime usually beats Switzerland on all-in cost. See Tax-Free Residency in Switzerland for the destination-side detail and How to Legally Exit a High-Tax Country for the multi-jurisdiction comparison.
Step-by-Step Move
Step 1: Confirm you can legally cease UK tax residency under the SRT
UK tax residency is determined by the Statutory Residence Test (SRT) in Schedule 45 of the Finance Act 2013, applied in three layers in order.
Automatic Overseas Tests — pass any one and you are conclusively non-resident for the UK tax year (6 April–5 April):
– Fewer than 16 days in the UK if you were UK resident in any of the previous 3 tax years.
– Fewer than 46 days if you were not UK resident in any of the previous 3 tax years.
– Full-time work overseas (35+ hours/week average) with fewer than 91 UK days and fewer than 31 days working in the UK.
Automatic UK Tests — 183+ days in the UK tax year, only home in the UK for a 91-day window, or full-time UK work make you conclusively UK resident.
Sufficient Ties Test — count ties (UK-resident family, available accommodation, 40+ UK working days, 90+ UK days in either of the prior two tax years, more UK days than any other single country) against days. As a “leaver”, a 4-ties profile allows only 16–45 UK days; 3 ties allows 46–90; 2 ties allows 91–120; 1 tie allows 121–182.
Switzerland’s tax-residency rule under the lump-sum regime requires being physically present 183+ days per year in the canton of residence, with no gainful employment in Switzerland. A clean UK→Switzerland move under the forfait therefore typically commits to roughly 16–45 UK days, 183+ Swiss days, and the balance distributed across travel — well within reach for a non-working principal but irreconcilable with continuing to run a UK business hands-on. Split-year treatment under SRT Cases 1–8 is essential: it lets you treat the year of departure as part-resident, part-non-resident so that UK tax cuts off on Switzerland-base income from the date of arrival. Cases 1 (starting full-time work overseas — usually inapplicable under the forfait), 3 (ceasing to have a home in the UK) and 8 (starting to have a home only overseas) are the most commonly relevant on this route.
Step 2: Plan around the UK’s five-year shadow and the FA 2025 IHT long-term residence rule
The UK has no general personal exit tax — there is no Canadian-style deemed disposition, no German Wegzugsteuer-style charge on substantial corporate holdings, and no §877A-style expatriation regime for citizens. Compared with most European peers, this is one of the UK’s biggest structural advantages for an HNW leaver.
What survives departure is the temporary non-residence rule under FA 2013 Sch 45 Part 4. If you become non-resident for fewer than five complete tax years and then return to UK residence, the UK pulls back into UK tax certain receipts realised during your absence: capital gains on assets held at the date of departure, distributions from close companies you control, lump-sum pension extractions, and offshore trust distributions. The clawback applies regardless of where you went — Switzerland’s lump-sum regime is no defence. For a UK→Switzerland mover crystallising a portfolio, founder shareholding or close-company dividend at the Swiss expenditure base, a return to UK residence inside five complete tax years recharacterises those receipts as UK-taxable in the year of return at full UK rates (24% CGT, 39.35% on close-company dividends). The planning rule is binary: commit to the full five complete tax years out, or restructure the timing of the realisation event.
The far more consequential change for HNW UK leavers in 2025–2026 is the long-term-residence basis for UK inheritance tax introduced by Finance Act 2025, replacing the old domicile-based system from 6 April 2025. If you were UK-resident for 10 of the prior 20 tax years (a “long-term resident”), your worldwide estate remains within the scope of UK IHT for up to 10 further tax years after you cease UK residence, on a sliding scale. UK-situs assets stay in scope indefinitely. Swiss cantonal inheritance tax is generally 0% to spouse and direct descendants, which is favourable on the Swiss side, but does not displace UK IHT during the long-term residence tail. The UK-Switzerland Estate Tax Convention (1994) does provide some relief — broadly, a Swiss-domiciled deceased’s estate is taxed primarily by Switzerland on Swiss-situs assets and primarily by the UK on UK-situs assets — but it does not override the UK long-term residence basis in the early years after departure. Lifetime gifting in advance of the seven-year potentially-exempt-transfer clock and excluded-property trust planning where still effective remain the structural levers.
The first formal departure step is the P85 (or self-assessment SA109 supplementary pages), filed for the tax year of departure to notify HMRC of the date you left and to support split-year treatment.
Step 3: Establish Swiss tax residency under the lump-sum regime
The lump-sum regime is open to non-Swiss nationals taking Swiss tax residency for the first time, or returning after at least 10 years abroad, who do not take up gainful employment in Switzerland. UK passport holders qualify on nationality. Spouses must also be non-Swiss for both to claim the forfait jointly. Passive management of own assets and serving on foreign company boards is generally permitted; running an active business on Swiss territory is not.
The tax base is the higher of: (i) annual worldwide living expenditure attributable to Switzerland, (ii) seven times the rental value of the family’s Swiss home (or actual rent paid), (iii) the federal minimum tax base of CHF 435,000 (2026), or (iv) the cantonal minimum (each canton sets its own — Geneva, for example, sets a minimum tax payable in the order of CHF 450,000–600,000+ rather than just a base; verify with cantonal source). A “control calculation” then ensures Swiss-source income, Swiss real estate and certain treaty-protected items are taxed at no less than ordinary Swiss rates.
Canton selection materially changes the bill. Central-Switzerland cantons (Zug, Schwyz, Nidwalden, Obwalden), Italian-speaking Ticino, and French-speaking Valais and Vaud are typically the most negotiable for UK applicants; Geneva is more expensive but practical for Geneva-area family ties. Cantons that have abolished the forfait by referendum — Zurich, Basel-Stadt, Basel-Landschaft, Schaffhausen, Appenzell Ausserrhoden — are not options. The right approach is to engage a Swiss fiscal lawyer to negotiate a written ruling with the target canton’s tax administration before committing to the move; a verbal indication is not binding.
The permit issued is a B permit (renewable annually for up to 10 years), upgrading to a C settlement permit after 10 years and feeding the path to Swiss naturalisation typically at 10–12 years total. UK nationals are treated as third-country (non-EU/EFTA) applicants since 1 January 2021, so the Swiss federal Migration office (SEM) typically pre-approves the permit before the canton issues it.
Step 4: Document the break and the new tie under the UK-Switzerland treaty
The UK-Switzerland Double Taxation Convention (signed 1977, multiple protocols, most recently 2017) is a comprehensive OECD-model treaty with a full Article 4 residence tie-breaker. For most cases this is decisive: where both states would treat you as resident, the cascade of permanent home → centre of vital interests → habitual abode → nationality determines the single residence state for treaty purposes. A clean Swiss-resident family with a Swiss home, Swiss banking, Swiss schooling and a 4-ties UK profile cleared down to 16–45 UK days will resolve unambiguously in Switzerland’s favour under the tie-breaker.
The structurally important wrinkle on this route is that the UK-Switzerland treaty restricts treaty benefits for forfait holders. Where lump-sum taxation excludes UK-source income (UK rental, UK dividends, UK pension, UK director fees, UK interest) from effective Swiss taxation, the UK is entitled to apply full domestic rates without treaty relief. The standard solution is the “modified forfait” (forfait modifié / modifizierte Pauschalbesteuerung): the lump-sum ruling is structured so that UK-source income is brought into ordinary Swiss tax computation alongside the expenditure-based base, in exchange for full treaty access. Most UK-applicant rulings are negotiated as modified forfaits from the outset; verify the precise mechanic with Swiss fiscal counsel and against the latest ESTV guidance.
Build a contemporaneous evidence file: P85 / SA109 filings; UK home sale completion or arm’s-length lease at full market rent; Swiss B-permit and the cantonal forfait ruling itself; long-term Swiss lease or property deed; Swiss bank attestations; Swiss compulsory health insurance (LAMal/KVG) registration for each family member; commune registration receipt; utility accounts in your name at the Swiss address; day-by-day SRT diary; and where requested, a Swiss “attestation de résidence fiscale” issued by the cantonal tax authority.
Step 5: First-year compliance in both jurisdictions
In your year of departure, file a split-year UK self-assessment with SA109, declaring UK income to the date of departure and only UK-source income (UK rental under the Non-Resident Landlord Scheme, certain pensions, government-service pensions, director’s fees) thereafter. UK-source rental remains UK-taxable; private pensions paid to a Swiss resident are governed by Article 18 of the UK-Switzerland DTC (typically Switzerland-only taxation, subject to the modified-forfait election); UK government-service pensions remain UK-taxable under Article 19.
In Switzerland, you file a Swiss annual tax return in the canton of residence reflecting the negotiated forfait base, plus the control calculation on Swiss-source items and the wealth-tax computation on imputed assets. Mandatory Swiss health insurance must be in place within three months of arrival. The forfait ruling is typically reviewed by the canton every five years, or earlier if family size, expenditure pattern or domicile changes materially.
Cost & Timeline
| Phase | Cost | Time |
|---|---|---|
| UK tax planning + cross-border review (pre-move) | £15,000–£60,000 | 1–3 months |
| UK departure return (P85 + SA109) | £1,500–£3,500 | At year-end |
| Swiss canton selection + forfait ruling negotiation | CHF 50,000–250,000 advisory | 2–4 months |
| Swiss housing (long-term lease or property purchase) | CHF 100,000+/yr lease; CHF 2M–10M+ purchase | 2–6 months |
| B-permit application (SEM pre-approval + canton issue) | CHF 5,000–20,000 govt fees + advisory | 3–6 months |
| Swiss compulsory health insurance | CHF 4,000–10,000+/yr per adult | Within 3 months of arrival |
| Annual lump-sum tax (typical UK applicant) | CHF 435,000–CHF 1,000,000+ | Annual |
| Total year-1 effective cost (rental route) | CHF 700,000–CHF 1,500,000+ | 6–10 months |
| Total year-1 effective cost (property purchase) | CHF 3,000,000–CHF 12,000,000+ | 8–12 months |
Treaty Considerations
The UK-Switzerland Double Taxation Convention provides the full OECD-model framework: Article 4 residence tie-breaker, allocation of taxing rights between the two states for income types, mutual agreement procedure for disputes, and exchange of information consistent with OECD standards (Switzerland implements CRS with the UK from 2018). Three points dominate the practical analysis on the lump-sum route.
First, Article 4 tie-breaker decisively resolves dual residence in favour of Switzerland for a clean forfait family with Swiss home, banking, family base and 16–45 UK days. The treaty floor is far more forgiving than a no-treaty route (e.g. UK→Monaco), where day-count discipline must be tighter.
Second, the forfait benefits restriction (in protocol exchanges and the standard Swiss treaty practice) means UK-source income excluded from effective Swiss tax under the lump-sum is denied UK treaty relief. The modified-forfait election brings UK-source income into ordinary Swiss tax computation in exchange for full treaty access — the standard structure for UK applicants.
Third, UK-situs property gains and rental income remain fully UK-taxable regardless of treaty position: non-resident CGT applies to disposals of UK residential and commercial property since April 2019, and UK rental income remains within UK self-assessment under the Non-Resident Landlord Scheme. The treaty allocates primary taxation to the situs state for immovable property.
The UK-Switzerland Estate Tax Convention (1994) allocates inheritance tax primarily by domicile and situs, but does not override the FA 2025 long-term residence basis during the post-departure tail.
Common Mistakes
- Not negotiating the modified forfait at the outset. A standard forfait can deny UK-source income treaty benefits, costing UK-source pension or dividend recipients real tax. Ensure the canton ruling is structured as a modified forfait covering UK-source items from year one.
- Triggering the five-year temporary non-residence clawback by returning early. Crystallising a portfolio or close-company dividend in Switzerland in year three and returning to the UK in year four pulls the full receipts back into UK tax at 24% CGT or 39.35% close-company dividend rate.
- Leaving the UK home “available” to a UK-resident spouse or child. The accommodation tie under SRT plus a 4-ties profile drags you back into UK residence and undoes the move. Either sell, place at arm’s-length market rent, or relocate the family.
- Choosing the wrong canton for the modified-forfait economics. Geneva and Vaud carry significantly higher cantonal floors than Zug, Schwyz, Nidwalden or Valais. A CHF 200,000–400,000 annual delta over 10+ years is the typical canton-selection prize.
- Underestimating the FA 2025 IHT long-term residence tail. A UK resident of 15 years moving to Switzerland in 2026 still has up to 10 years of worldwide UK IHT exposure on departure. The Swiss treaty does not displace this in the tail.
- Taking up gainful employment in Switzerland. Any employment contract or active business activity inside Swiss territory disqualifies the forfait. Foreign-board roles, passive shareholdings and own-portfolio management are generally fine — get the activity perimeter written into the ruling.
FAQ
Will I still have to file in the UK after moving to Switzerland?
For UK-source income — UK rental, certain pensions, director’s fees from UK companies, and disposals of UK property — yes, indefinitely. The split-year SA109 deals with the year of departure. The five-year temporary non-residence rule means a delayed UK liability if you return, and the FA 2025 long-term residence rule means continued UK estate exposure for up to 10 years after departure.
Can I keep my UK ISA, SIPP, bank accounts and property?
Bank accounts: yes, on a non-resident profile. SIPP: yes — drawdowns are governed by Article 18 of the UK-Switzerland DTC and typically taxable in Switzerland under the modified forfait. ISA: technically yes, but the wrapper has no Swiss effect. UK property: yes; rental income remains UK-taxable as UK-source under the Non-Resident Landlord Scheme, and a future sale falls within UK non-resident CGT.
What is a “modified forfait” and why does it matter for UK applicants?
The standard lump-sum regime taxes you on Swiss expenditure and excludes worldwide income from assessment. The UK-Switzerland treaty (and Swiss treaty practice with several other OECD partners) restricts treaty benefits unless UK-source income is brought into ordinary Swiss tax computation alongside the lump-sum base. The “modified forfait” is the negotiated structure that does this — preserving treaty access on UK pensions, dividends, interest and director’s fees in exchange for ordinary Swiss tax on those flows.
How much will my Swiss tax bill actually be?
The federal minimum tax base is CHF 435,000 (2026), but the cantonal minimum is what dominates. Geneva and Vaud effectively set total minimum tax in the order of CHF 450,000–600,000+ per year; central Switzerland (Zug, Schwyz, Nidwalden) can be lower; Valais and Ticino are competitive on lifestyle. Always negotiate a written ruling before moving — verbal indications are not binding.
What if HMRC disputes my exit?
Provide the B-permit, the cantonal forfait ruling, the registered Swiss lease or title deed, Swiss bank attestation, Swiss compulsory health insurance, commune registration, utility and bank-card evidence of physical presence, the contemporaneous SRT day-count diary, and the cantonal “attestation de résidence fiscale”. With a comprehensive treaty in place, Article 4 tie-breaker will typically resolve a borderline case in Switzerland’s favour for a clean forfait family.
How does the new UK long-term residence rule affect a Swiss move?
From 6 April 2025, the UK applies a long-term-residence basis for IHT: 10+ of the prior 20 UK tax years brings worldwide IHT for up to 10 years post-departure, on a sliding scale. UK-situs assets remain in scope indefinitely. Swiss cantonal inheritance tax to spouse and direct descendants is generally 0%, but does not displace UK IHT in the post-departure tail. Lifetime gifting and excluded-property trust review should be addressed before the move.
Next Step
For the full destination-side breakdown, see Tax-Free Residency in Switzerland. For a deeper look at exit-tax mechanics and where the UK sits in the global picture, see How to Legally Exit a High-Tax Country. For comparison routes considered by many UK leavers, see UK to Monaco, UK to Italy, and UK to Cyprus.
Book a free consultation — we specialize in post-non-dom UK relocations and the canton-selection, modified-forfait negotiation and B-permit sequencing required for a clean Swiss move.
Last updated: 2026-04-27
Sources:
– HMRC Statutory Residence Test (RDR3) — https://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt
– HMRC Temporary Non-Residence guidance (Sch 45 FA 2013) — https://www.gov.uk/hmrc-internal-manuals/residence-domicile-and-remittance-basis
– HMRC Long-Term Residence and IHT (Finance Act 2025) — https://www.gov.uk/government/publications/changes-to-the-taxation-of-non-uk-domiciled-individuals
– UK-Switzerland Double Taxation Convention (1977, as amended) — https://www.gov.uk/government/publications/switzerland-tax-treaties
– Swiss Federal Tax Administration (ESTV/AFC) — Lump-sum taxation overview — https://www.estv.admin.ch/
– PwC Worldwide Tax Summaries — Switzerland Individual Taxation — https://taxsummaries.pwc.com/switzerland/individual
– State Secretariat for Migration (SEM) — Residence permits B and C — https://www.sem.admin.ch/