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    TaxKilnUK tax guidance
    TaxKilnUK tax guidance

    Business Owner Moving Abroad → Sole trader continuing UK trade

    Sole Trader Continuing UK Trade After Moving Abroad — Source Rules, NI, VAT, IR35

    A UK sole trader moving abroad does NOT automatically end the UK trade. The trade continues to be UK-source — and UK-taxable as trading profits — for as long as the 'real centre of trading operations' remains in the UK (Erichsen v Last (1881) 8 QBD 414 + Smidth v Greenwood [1922] AC 417 + Grainger & Son v Gough [1896] AC 325). Where contracts are habitually concluded matters. Where the trade is carried on matters. The sole trader becomes UK-non-resident under SRT but UK-source trade profits remain assessable as UK trading income — typically via a UK 'branch or agency' analysis or a treaty PE analysis under the relevant DTA. Class 2 NI (£3.50/week 2025/26) is abolished for new applicants from 6 April 2026 (grandfathered for those already paying) — Class 3 (£17.75/week) becomes the only voluntary route. Class 4 NI (6%/2% main/upper rates from 2024/25) applies to UK-source trade profits regardless of residence. VAT registration continues if UK taxable supplies exceed the £90,000 threshold; place-of-supply rules determine where each supply is treated as made.

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    Guidance, not advice. We explain the rules, we don't assess your situation. Always seek financial or tax advice from your accountant, or contact HMRC. Read our editorial scope →

    In plain English

    Three independent layers stack: (1) Income tax on the trade. UK-source trading profits remain UK-taxable under ITTOIA 2005 even if you are non-UK-resident under SRT. The 19th-century cases (Erichsen, Smidth, Grainger) ask: where is the trade actually carried on? Test factors: where contracts are concluded; where production / service delivery happens; where decision-making sits; where customer relationships originate. A UK plumber who emigrates to Spain but flies back monthly to do UK jobs is plainly still trading in the UK. A UK SaaS sole trader who emigrates to Lisbon and continues delivering hosted software to UK customers from Portugal is harder — Grainger says marketing-to-UK is not UK trade, so the trade may have shifted to Portugal. Each fact pattern needs analysis. Under UK-treaty mechanics, the 'branch or agency' concept (ITA 2007 s.835E) and the DTA's 'permanent establishment' concept (Article 5) typically align: if you have UK PE, UK keeps trading rights; if no UK PE, the DTA usually allocates the trade to the residence state. (2) National Insurance. Class 2 (flat-rate, gives State Pension qualifying year) was £3.50/week 2025/26. It is abolished for NEW applicants from 6 April 2026 (Autumn Budget 2024 confirmation) — existing Class 2 payers can continue. Class 3 (£17.75/week) becomes the only voluntary route for new emigrants from April 2026. Class 4 (profit-based, no State Pension qualification) applies to UK-source self-employment profits regardless of residence — 6% on profits £12,570-£50,270, 2% above. There is no NI in destination countries with no totalisation agreement; UK Class 2/3 voluntary is the typical State Pension preservation route. (3) VAT. Continuing to make UK taxable supplies above £90,000 (12-month rolling threshold from 1 April 2024) requires continued UK VAT registration. Place of supply rules (Schedule 4A VATA 1994) determine where each supply is treated as made — and therefore whether UK VAT applies. B2B services to UK businesses: place of supply is UK if the customer belongs in UK. B2C services: place of supply is supplier's establishment (which has moved). B2C digital services to UK consumers: place of supply is UK (One Stop Shop / EU OSS regimes apply if you sell to EU consumers). Goods: physical location at point of supply determines place. MTD-VAT obligation continues regardless of supplier residence. (4) IR35 / off-payroll. If you provide services to UK clients via a UK Ltd Co (intermediary), IR35 (ITEPA 2003 Ch 8/10) may apply. Post-April 2021 reform, large UK end-clients determine status. Non-resident contractors are not exempt — the UK client still applies the determination and operates PAYE on deemed direct payments if 'inside IR35'.

    How it works

    Erichsen / Smidth / Grainger — the 'where carried on' tests

    Erichsen v Last (1881): a UK telegraph company with foreign customer base was held UK-source because the trade activity (telegraph operation) took place in the UK. Smidth v Greenwood (1922): a Danish company with UK sales agents selling cement-making machinery to UK customers was held NOT UK-trading because contracts were concluded in Denmark; Lord Atkinson asked 'where are these contracts made?'. Grainger & Son v Gough (1896): a French wine producer using UK agents to solicit UK orders was held to be 'trading WITH' the UK (orders forwarded to France for acceptance + production + dispatch) rather than 'trading IN' the UK. Together these establish: (a) contract conclusion location is highly weighted; (b) where production/service delivery happens matters; (c) UK marketing/customer acquisition alone is insufficient; (d) decision-making + risk-taking location matters. Modern application to a digital sole trader requires careful application to each fact pattern.

    ITA 2007 ss.835A-835E — branch or agency

    Non-resident's UK trading income chargeable to UK tax where carried on through a 'permanent establishment in the United Kingdom' (s.835E) — incorporates the OECD Model Article 5 PE concept into UK domestic law. If trade-from-abroad has no UK fixed place AND no UK dependent agent habitually concluding contracts, the trade has likely ceased to be UK-source — though source rules still need separate analysis under Erichsen/Smidth/Grainger.

    Class 2 NI — pre-departure decision (URGENT before 6 April 2026)

    Class 2 NI (£3.50/week 2025/26) is the cheapest route to UK State Pension qualifying years. It is being abolished for NEW applicants from 6 April 2026 (FA 2024 + Autumn Budget 2024 confirmation). Existing Class 2 payers (whether by election or compulsion as self-employed) are grandfathered. EMIGRANTS WHO WANT CLASS 2: must file CF83 (NI abroad application) BEFORE 6 April 2026 and have HMRC approve the Class 2 status. After 6 April 2026, Class 3 (£17.75/week — 5× the cost) is the only voluntary route. Practical: any sole trader contemplating emigration in 2026 or beyond should file CF83 in early 2026 to lock in Class 2 grandfathering.

    Class 4 NI — UK source trade profits regardless of residence

    Class 4 NI is charged on UK trade profits of UK + non-UK-resident self-employed individuals where the trade has UK source. 2025/26 + 2026/27 rates: 6% on profits £12,570-£50,270 (main); 2% above £50,270 (upper). Spring Budget 2024 cut the main rate from 8% to 6%; subsequent budgets have held the rate. No UK NI deductibility against trade profit; no Class 4 in destination country (different national rules apply).

    VAT place of supply — Schedule 4A VATA 1994

    Place of supply determines whether UK VAT applies. For services: B2B = customer's establishment (so UK customer = UK VAT for the supplier where UK-registered); B2C = supplier's establishment (so non-resident supplier = no UK VAT, but customer's country may apply foreign VAT). Special rules for: digital services to consumers (consumer's country — One Stop Shop schemes); land-related services (land's location); short-term hire of transport (where put at disposal). For goods: physical location at the time of supply (subject to import/export rules + post-Brexit complications for EU sales). UK VAT registration threshold £90,000 (rolling 12 months) — continuing UK supplies above this require continued registration.

    MTD-VAT continuing obligation + IR35 / off-payroll

    All VAT-registered businesses must file via MTD-compatible software (since 1 April 2022) — applies equally to non-resident sole traders with UK VAT registration. MTD-ITSA Phase 1 from 6 April 2026 (income £50k+); Phase 2 from 6 April 2027 (£30k+); Phase 3 from 6 April 2028 (£20k+) — applies to sole traders + landlords with UK trade/property income regardless of residence. IR35 (ITEPA 2003 Ch 8) + off-payroll (Ch 10): non-resident contractors providing services to UK clients via an intermediary (UK Ltd Co) are subject to IR35 status determination by the UK end-client (if 'large' under Companies Act criteria). Inside IR35 = deemed direct payment with UK PAYE; outside IR35 = ordinary intermediary treatment.

    Who this applies to + key conditions

    Statute + manual references

    Primary: ITTOIA 2005 (trading income basis); ITA 2007 ss.835A-835E (branch or agency); SSCBA 1992 ss.11-13 (Class 2 + 4 NI); VATA 1994 + Schedule 4A (place of supply); ITEPA 2003 Chapters 8 + 10 (IR35 + off-payroll); FA 2024 (Class 2 abolition for new applicants from 6 April 2026).

    Related: ITA 2007 s.13 — basic rate band for UK trading income of non-residents; Schedule 1A SSCBA 1992 — Class 3A NI (closed cohort); VAT (Amendment) Regulations 2018 — MTD compulsory filing; Article 5 + 7 OECD Model — PE + business profits for treaty analysis; Reciprocal Agreement on Social Security — relevant for state-specific Class 2 alternatives

    HMRC manual: BIM44000 (UK trade source); NIM23800 (Class 2 abroad); NIM26000 (Class 4); VATPOSS00000 (place of supply); ESM10000 (IR35)

    Case law: Erichsen v Last (1881) 8 QBD 414, 4 TC 422; F L Smidth & Co v Greenwood [1922] 8 TC 193, AC 417; Grainger & Son v Gough [1896] AC 325, 3 TC 462; Maclaine & Co v Eccott [1926] AC 424; Firestone Tyre and Rubber Co Ltd v Lewellin [1957] 1 WLR 464

    Common mistakes + traps

    Worked example

    Tom, UK sole trader plumbing business, 12 years trading, £85,000 annual turnover, moves to Spain 1 May 2026. He plans to fly back to UK monthly to complete UK jobs.

    Tom Plumbing (sole trader, UK VAT-registered, £85,000 turnover, ~£55,000 net profit). Tom moves to Costa del Sol 1 May 2026 on a Spanish non-lucrative visa. He intends: (a) monthly trips back to UK for 7-10 days each, completing pre-booked UK plumbing jobs; (b) eventual transition to Spanish-based plumbing serving UK expats. Year 1 (2026/27) — UK trade continues largely unchanged.

    1. Step 1 — UK source analysis: contracts concluded in UK (during monthly trips); work physically performed in UK; UK customer base; UK regulatory framework (Gas Safe + WaterSafe). Erichsen + Smidth tests squarely met → UK-source trade.
    2. Step 2 — UK SRT 2026/27: Tom is in UK ~120 days (12 trips × 10 days). Likely UK-resident under sufficient ties test (4 ties: family in UK extended; UK accommodation; UK work; 90+ day tie carried). Split-year may apply Case 1 (full-time work abroad) — but his work pattern is sporadic UK trade, not full-time overseas. Likely UK-resident 2026/27 under sufficient ties unless he restructures. (For 2027/28 onwards, with Spanish-based plumbing dominating, full-time overseas work test may engage.)
    3. Step 3 — Class 2 NI: Tom files CF83 before 6 April 2026 (well in advance of move). HMRC approves Class 2 continuation from 1 May 2026 — grandfathered. Cost £3.50/week × 52 = £182/year. Locks in State Pension qualifying years for the remainder of his career.
    4. Step 4 — Class 4 NI: applies to UK-source profits. £55,000 profit → 6% on £42,430 (£55,000 - £12,570) = £2,546. Charged via UK SA regardless of residence.
    5. Step 5 — UK VAT: turnover £85,000 — below £90,000 threshold. Tom could deregister but typical UK plumbing business has commercial reason to remain VAT-registered (B2B customers, input tax recovery on van/tools). Continues UK VAT registration + MTD filing.
    6. Step 6 — Spanish position: Spanish AEAT will likely classify Tom as Spanish tax resident from 1 May 2026 (Spanish residence test = 183 days OR centre of economic interests; non-lucrative visa = automatic residence). Worldwide income taxable in Spain. UK trade profits taxable in Spain (with double tax relief for UK tax paid).
    7. Step 7 — Spain UK DTA 2013 Article 7 (business profits) + Article 5 (PE): Tom has no Spanish PE for UK plumbing trade. Article 7 allocates UK plumbing trade profits to UK (residence state of trade — UK, where the trade is carried on). Spain taxes the profit but gives foreign tax credit for UK income tax + Class 4 NI paid. Net Spanish tax = Spanish rate (~24% IRPF on this band) minus UK tax credit.
    8. Step 8 — Spanish autonomo registration: if Tom takes on any Spanish clients (or is treated as Spanish-source for any income), he must register as autonomo (Spanish self-employed) + pay Spanish social security cuota (~€294/month for the first year reduced rate). Initially he avoids this if his Spanish activity is nil — but the Spanish AEAT may scrutinise.

    Outcome: Tom's UK trade remains UK-source; UK income tax + Class 4 NI continue; Class 2 NI grandfathered via pre-April-2026 CF83 filing. Spanish tax applies on worldwide income with UK credit. Total tax ~ UK 20% effective on profit + Spanish top-up (~4-6% effective) ≈ 25%. Saving vs UK-resident scenario is modest in year 1 (Spanish IRPF is competitive but not zero); larger benefit emerges if/when Tom transitions to Spanish-located plumbing (UK source ceases, Spanish residence taxes only the Spanish business). Critical action: CF83 filed BEFORE 6 April 2026 — missing this deadline costs ~£740/year extra (Class 3 vs Class 2) for the rest of Tom's working life.

    How this connects to the rest of the framework

    CMC + corporate residence →

    Sole trader vs Ltd Co decision is different — Ltd Co triggers CMC + s.185 exit charge; sole trader doesn't. Many small businesses incorporate before departure — wrong direction if exit charge is significant.

    PE risk + treaty mechanics →

    PE analysis equally applies to sole traders — branch or agency (UK domestic) + Article 5 (treaty) align.

    8 scenarios →

    Scenarios 3 (tradesperson AU), 5 (day-trader Spain), 7 (eCommerce UAE), and 8 (crypto trader Dubai) all involve sole-trader-style continuing UK trade decisions.

    /moving-abroad/ni-state-pension-abroad →

    Voluntary Class 2/3 mechanics + April 2026 abolition for new Class 2 applicants — critical pre-departure timing decision.

    /moving-abroad/leaving-uk-procedures →

    P85 + SA109 + CF83 sequence for sole traders includes the Class 2 grandfathering filing.

    Frequently asked questions

    What happens if I miss the Self Assessment deadline?+
    The Self Assessment deadline is 31 January (online filing) for the previous tax year. Miss it and HMRC apply an automatic £100 penalty. Beyond that: £10 per day from 3 months late (capped at £900), 5% of tax due at 6 months late, and another 5% at 12 months late, under Schedule 55 of the Taxes Management Act 1970. If you have a genuine reason (serious illness, bereavement, technical issue with HMRC's systems) you can appeal with evidence; HMRC accepts reasonable excuse appeals in most genuine cases.
    Do I need an accountant or can I file Self Assessment myself?+
    Legally you can file Self Assessment yourself via gov.uk for free, most simple sole-trader returns (single income source, basic expenses) are realistic to self-file. An accountant adds real value when: your trading profit is above £40,000 (extraction-strategy decisions matter), you have multiple income streams (PAYE + self-employment + property + dividends), you've crossed the £90,000 VAT threshold, you're considering incorporation, or you have an HMRC enquiry. Expect to pay £400-£1,500/year for a typical sole-trader accountant; the cost is itself a deductible expense.
    How do payments on account work?+
    When your Self Assessment tax bill exceeds £1,000 for the first time, HMRC requires payments on account toward NEXT year's tax. Half the current bill is due 31 January (alongside the current bill); the other half is due 31 July. So your first January after crossing the threshold can hit with a double-bill: last year's balance + first payment on account. Adjust via Form SA303 if you expect next year's income to drop substantially. Payments on account don't apply if more than 80% of your tax is collected via PAYE.
    If I incorporate a UK Ltd Co just before emigrating, is that simpler than staying as a sole trader?+
    Usually no — it adds complexity. Incorporation triggers: (a) CMC + s.185 exit charge analysis on any subsequent migration; (b) PAYE on director's salary; (c) close company anti-avoidance regime; (d) BADR / SSE planning if you ever sell. For a sole trader with no business assets of significance, staying as sole trader through the emigration is typically simpler. Incorporation makes sense only if there's a genuine commercial reason (limited liability, succession planning, scale).
    Can I close my UK sole trader and start a fresh trade in Spain to break the UK source?+
    Yes — but the transition must be genuine. If your customers, contracts, equipment, brand, and operations all transition to Spain, the UK trade has ceased and a new Spanish trade has commenced. If you simply rebadge the same UK trade as 'Spanish' while still serving UK customers through UK monthly trips, the substance test under Erichsen/Smidth applies and UK source likely continues. HMRC may scrutinise transitional arrangements.
    Does Making Tax Digital for Income Tax (MTD-ITSA) apply to non-resident sole traders?+
    Yes if the trade is UK-source. MTD-ITSA phases in: from 6 April 2026 for sole traders + landlords with combined gross income £50,000+; from 6 April 2027 for £30,000+; from 6 April 2028 for £20,000+. Quarterly digital updates + end-of-period statement + final declaration replace traditional SA. Applies to UK-source income regardless of residence.
    If a UK client puts me 'inside IR35' as a non-resident contractor, what happens?+
    The UK end-client (if classed as 'large' under Companies Act criteria — turnover >£10.2m, balance sheet >£5.1m, or 50+ employees) determines IR35 status. Inside IR35: deemed direct payment treated as employment income with UK PAYE + NI deducted at source by the deemed employer (typically the fee-payer). For non-resident contractors, UK PAYE applies but NI may be modified per the relevant social security agreement (none with most destinations). The contractor's UK Ltd Co receives the net-of-PAYE amount; further extraction triggers normal dividend / s.811 mechanics.

    Free + regulated-body resources

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