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    TaxKilnUK tax guidance
    TaxKilnUK tax guidance

    Multinational tax + tax gap → Transfer pricing basics

    Transfer Pricing Basics — TIOPA 2010 Part 4 + SME Exemption (50-249 Employees)

    Transfer pricing governs how transactions between connected parties (typically members of the same multinational group) are priced for UK tax purposes. The UK framework is in TIOPA 2010 Part 4, applying the OECD's arm's length principle: transactions between related parties must be priced as if the parties were independent. The UK adopts the OECD Transfer Pricing Guidelines (most recent 2022 edition) as the interpretive source. Documentation requirements were tightened by Finance Act 2023: UK members of groups with consolidated turnover above €750m must maintain Master File + Local File + Country-by-Country Report. Crucially, the SME exemption removes the full TP rules entirely for small groups (<50 employees AND <€10m turnover or balance sheet); medium-sized groups (50-249 employees / €10-50m turnover) face reduced documentation but the principle still applies.

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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

    Transfer pricing is the single largest topic in international tax. Two-thirds of cross-border transactions are between members of the same multinational group, which means pricing decisions inside the group directly determine how profit is allocated between jurisdictions — and therefore how much tax each jurisdiction collects. The arm's length principle is simple in statement, complex in application. UK Co sells goods to Ireland Co (same group). The price must be what an independent buyer would pay. If UK Co sells too cheap, UK profit is artificially low → UK tax base eroded → HMRC challenges under TIOPA 2010 Part 4. The OECD Transfer Pricing Guidelines (2022 edition) set out the comparability framework, the five methods (CUP, RPM, Cost+, TNMM, Profit Split), and the documentation expectations. The UK adopts these in full. Documentation is where most practical friction sits. Post-FA 2023, UK members of large groups (>€750m consolidated turnover) must maintain Master File (group-wide overview) + Local File (UK-specific transactions) + Country-by-Country Report (jurisdictional profit + tax + employee + asset data). Failure to maintain penalties under Sch 24 FA 2007. The SME exemption is structurally important: most UK SMEs are exempt from full TP rules. This is not a 'loophole' — it is a deliberate policy choice recognising that the compliance cost of arm's length documentation would crush small businesses.

    How it works

    Arm's length principle

    Transactions between connected parties must be priced as if the parties were independent. UK Co + Ireland Co (both group members) must transact at the price two unrelated parties would agree. HMRC has the power to adjust UK taxable profits to the arm's length figure under TIOPA 2010 s.147.

    OECD methods (in hierarchy)

    (1) Comparable Uncontrolled Price (CUP) — direct price comparison; (2) Resale Price Method (RPM); (3) Cost Plus; (4) Transactional Net Margin Method (TNMM) — most commonly used in practice; (5) Profit Split — used for highly integrated operations.

    Master File

    Group-wide overview: organisational structure; business description; intangibles; intercompany financial activities; group financial + tax positions. Single document per group, available to all relevant tax authorities.

    Local File

    UK-specific document: UK Co's operations + management; material connected-party transactions; methods + economic analysis; supporting documentation. Detailed and UK-specific.

    Country-by-Country Report (CbCR)

    Aggregate jurisdictional data for groups with consolidated turnover >€750m: revenue, profit, tax paid, employees, assets per jurisdiction. Filed with HMRC; exchanged with other tax authorities under OECD framework.

    SME exemption + medium-sized treatment

    Full SME exemption: <50 employees AND <€10m turnover/balance sheet → TIOPA 2010 Part 4 does not apply (limited exceptions: tax-haven jurisdictions; HMRC notice). Medium-sized (50-249 employees / €10-50m turnover): TIOPA 2010 Part 4 applies but reduced documentation. Tests applied at group level.

    Profit Diversion Compliance Facility (PDCF)

    HMRC voluntary disclosure programme for profit-shifting concerns. Reduced penalties for early disclosure. Targeted at mid-market multinationals.

    Advance Pricing Agreements (APAs)

    Forward-looking agreement between taxpayer + HMRC (and potentially other tax authorities) on TP methodology for specified transactions. Reduces dispute risk. Bilateral + multilateral APAs available.

    Who this applies to + key conditions

    Statute + manual references

    Primary: TIOPA 2010 Part 4 — Transfer Pricing.

    Related: Finance Act 2023 — Master File + Local File documentation requirements; Finance Act 2024 + Finance Bill 2026 — refinements + 2026 UTPP integration; OECD Transfer Pricing Guidelines 2022; OECD Multilateral Instrument (UK in force 1 October 2018); Companies Act 2006 — related-party disclosure (FRC FRS 102/IFRS 16)

    HMRC manual: INTM410000+ (International Manual — Transfer Pricing); INTM440000+ (Methods)

    Common mistakes + traps

    Worked example

    UK Co + Ireland Co — intra-group software licence

    Group Z has UK Co (R&D + sales) and Ireland Co (IP holding). Ireland Co licences software to UK Co for £10m/year. UK Co re-licences to customers for £15m/year. Group consolidated turnover €1.2bn (above CbCR threshold).

    1. Step 1 — TIOPA 2010 Part 4 applies (in scope; group is large).
    2. Step 2 — Documentation: Master File + Local File + CbCR required from FY beginning on/after 1 April 2023.
    3. Step 3 — Method selection: CUP if external software licence comparables exist; if not, TNMM benchmarking to comparable independent software distributors.
    4. Step 4 — TNMM analysis: comparable software distributors earn ~10% operating margin on revenue. UK Co should earn ~£1.5m on £15m revenue → cost base £13.5m → licence fee from Ireland should be ~£13.5m (not £10m).
    5. Step 5 — If licence at £10m, UK Co reports £5m profit (33% margin) — above arm's length. HMRC would likely accept (UK profit higher, not lower).
    6. Step 6 — If licence were £14m and UK Co reported £1m profit (~7% margin), HMRC could challenge for being below arm's length range, adjust upward, charge under TIOPA 2010 s.147.
    7. Step 7 — File CbCR with HMRC; HMRC exchanges with Ireland Revenue under OECD framework.

    Outcome: Group Z documents the TP position robustly: Master File + Local File + CbCR. Method selection (CUP or TNMM) supported by benchmarking. Arm's length defensible. Audit risk managed.

    How this connects to the rest of the framework

    Diverted Profits Tax + 2026 reform →

    DPT is the backstop to transfer pricing; 2026 UTPP reform integrates the two regimes.

    Pillar Two — 15% global min tax →

    Transfer pricing remains the first-order allocation; Pillar Two is the 15% jurisdictional top-up backstop.

    BEPS — 15 Actions →

    BEPS Actions 8-10 are the OECD transfer pricing actions; UK MLI implementation 1 October 2018.

    SME vs multinational effective rates →

    TP SME exemption is structurally why most UK SMEs don't need TP infrastructure.

    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.
    Does the SME exemption mean small UK companies can price arbitrarily?+
    No — SME exemption removes TIOPA 2010 Part 4 obligations but not general anti-avoidance (GAAR) or specific anti-abuse rules. Aggressive pricing can still be challenged via other routes.
    What is the difference between Master File and Local File?+
    Master File is group-wide overview (one document per group). Local File is UK-specific (one per UK member, detailed).
    Is CbCR public?+
    Currently CbCR is exchanged between tax authorities, not public. EU has introduced public CbCR (CBAM-aligned); UK has not adopted public CbCR.

    Free + regulated-body resources

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