IR35 — officially the UK's off-payroll working rules — is about whether a UK client's business must treat a contractor as a disguised employee for UK Income Tax and National Insurance purposes. It applies when a worker supplies services through an intermediary, usually a UK-style personal service company (PSC). Most Nigerian freelancers who invoice UK clients directly, as individuals or through a Nigerian-registered business rather than a UK PSC, sit outside the core mechanics of IR35 entirely (GOV.UK). The 6 April 2026 changes raised the turnover and balance-sheet thresholds that decide whether a UK client counts as "small" — turnover from £10.2 million to £15 million, balance sheet total from £5.1 million to £7.5 million, with the 50-employee headcount test unchanged (Greenberg Traurig). That reclassifies an estimated 14,000 UK companies as "small," shifting IR35 status-determination duty from the client back to the contractor's own intermediary — but because company size is judged on the *prior* financial year's accounts, most businesses won't feel the practical effect until the 2027-28 tax year at the earliest (CXC Global).
IR35 exists to stop someone from working full-time, employee-like hours for one UK business while billing through a limited company to pay less tax than a payroll employee would. Since April 2021, medium and large UK private-sector clients (not the contractor) have carried the legal duty to issue a Status Determination Statement (SDS) saying whether an engagement is "inside" IR35 (taxed like employment) or "outside" it (taxed as genuine self-employment) (Worksuite). Everything about this — the SDS, the PAYE deduction, the fee-payer liability — is built around UK tax law applying to a UK-based intermediary. If there's no UK PSC in the chain, there's no UK PAYE/NIC obligation to trigger in the first place.
The update itself is narrow: it moves the goalposts for which UK end-clients are exempt from doing IR35 assessments at all. Small companies (under the new, higher thresholds) don't have to determine contractor status — that responsibility falls on the contractor's own intermediary instead (Together Accounting). For a UK client that just crossed into "small" territory, this can mean less formal process, fewer blanket "inside IR35" determinations, and more room to negotiate genuine outside-IR35 terms — a dynamic worth knowing if you're weighing offers from a smaller UK agency versus a large one.
For most Nigerian freelancers, the honest answer is: not directly. If you invoice a UK client as a sole proprietor or through a Nigerian entity — not a UK-registered PSC — you're outside the specific legal machinery of IR35, which is triggered by a UK intermediary structure (Kingsbridge). What you're actually navigating is general UK employment-status risk and how the client chooses to pay you — not IR35's PAYE deduction mechanics, which have nothing to attach to without a UK company in the chain.
Where it *can* become relevant is if you set up a UK limited company to invoice through — something some Nigerian contractors do for banking or client-preference reasons. At that point you've built exactly the intermediary structure IR35 is designed to test, and the usual factors apply: who controls your hours and methods, whether you can send a substitute, whether you carry financial risk, and whether you're integrated into the client's team like an employee (Qdos).
The off-payroll rules only apply where the end client has a UK connection — is UK tax-resident or has a UK permanent establishment. A client that is wholly overseas (no UK office, no UK tax presence) doesn't have to run an IR35 assessment at all, and if you were engaged through an intermediary in that scenario, the determination duty would sit with the intermediary, not the client (Roots Insurance). Most UK companies hiring Nigerian freelancers, however, are genuinely UK-based — so this exemption mainly matters if your client is a UK-headquartered group operating through an offshore subsidiary.
Even without IR35 technically applying to you, its ripple effects shape how UK companies hire abroad. Many now route international contractors through umbrella companies or Employer-of-Record platforms (Deel, Multiplier, Remote) specifically to sidestep IR35 ambiguity altogether — which changes your invoicing structure, payment currency, and sometimes your effective take-home rate through added platform fees. Others apply a blanket "everyone gets an SDS, everyone gets treated the same," even where it isn't legally required for an overseas freelancer, simply because it's operationally simpler for their finance team. If a UK client suddenly asks you to go through a specific payment platform or restructure your contract terms, this is usually why — worth asking directly rather than assuming it reflects your standing with them.
IR35 governs UK tax on UK intermediaries — it says nothing about what you owe in Nigeria. Income earned from UK clients is still assessable income under Nigerian tax law regardless of how the UK side classifies the engagement, and conflating "outside IR35" with "no tax anywhere" is a costly mistake. Keep invoices, contracts, and payment records in both currencies so you (or an accountant) can reconcile foreign-currency income against FIRS obligations independently of whatever the UK client's paperwork says.
- Get contract terms in writing that describe you as an independent contractor invoicing directly — not as someone integrated into the client's HR/payroll process.
- Ask before assuming: if a client mentions an SDS or IR35 review, ask plainly whether it applies to your specific engagement given you're a non-UK-resident contractor without a UK PSC.
- Watch for platform switches: a move to an umbrella company or EOR is often IR35-driven risk management on the client's side, not a reflection of your work.
- Separate the two tax systems in your records: what a UK client determines about IR35 has no bearing on your Nigerian filing obligations.
- Track the FX, not just the invoice total: rate movement between invoice date and the day the money lands in a domiciliary or aggregator account changes what you actually keep — worth reconciling regardless of contract structure.
- Confirm whether you're invoicing directly or through any UK-registered entity.
- Confirm whether the client is UK tax-resident or has a UK permanent establishment.
- Ask if an SDS has been or will be issued, and what it says.
- Clarify the payment rail and currency — direct transfer, platform, or umbrella company.
- Keep your own record of invoices and FX rates alongside whatever the client provides.
For Nigerian freelancers juggling GBP, USD and naira across several UK and other-currency clients, a tool like Kampe — which reads across your accounts to show one honest net-worth and spendable number, with FX rate and source always shown — can make it easier to see what a contract is really worth once currency movement and multiple income streams are accounted for, without you having to move or hold funds through it.