IR35 small company threshold changes 2026 — contractor self-determination guide
Direct Answer
From 6 April 2026, the small company thresholds increased to £15m turnover (was £10.2m) and £7.5m balance sheet (was £5.1m). Around 14,000 companies are reclassified as small as a result. Where your end-client is now small, your PSC regains responsibility for its own IR35 status determination — the off-payroll Chapter 10 rules no longer apply. HMRC is escalating enforcement activity in 2026-27, so getting your self-determination right matters more than ever.
The new thresholds — what changed on 6 April 2026
The Companies Act definition of a "small company" determines which end-clients fall outside the off-payroll working rules (IR35 Chapter 10, ITEPA 2003). A company is small if it meets at least two of three criteria. From 6 April 2026:
- Annual turnover: up to £15 million (previously £10.2 million)
- Balance sheet total: up to £7.5 million (previously £5.1 million)
- Number of employees: up to 50 (unchanged)
The previous thresholds had remained static for many years while inflation and business growth caused many companies to breach them and tip into the medium-sized category. The 2026 increase corrects for that — and approximately 14,000 companies that were medium-sized now qualify as small.
There is an important timing caveat: a company's size is assessed by reference to its prior financial year. This means the practical reclassification will not take effect immediately for many clients — it depends on when their financial year ends. Some contractors will not feel the effect until later in 2026 or early 2027.
For a full explanation of the IR35 rules themselves, see our IR35 guide.
What "dropping out of scope" means for your PSC
Where the end-client is small, Chapter 10 (off-payroll working) simply does not apply. The consequences are significant:
- Your end-client no longer issues a Status Determination Statement (SDS) — and is not required to
- Your end-client is not the fee-payer responsible for deducting PAYE and National Insurance if the engagement is inside IR35
- Your PSC makes its own determination of whether the engagement is inside or outside IR35 under Chapter 8 (the original pre-2017 rules)
- If your PSC gets the determination wrong and HMRC successfully challenges it, the liability sits with your company
This is not a licence to operate outside IR35 without justification. The underlying employment status tests — mutuality of obligation, control, and the right of substitution — still apply exactly as before. What changes is that you now make the call, and you bear the risk if you get it wrong.
The good news is that if your engagement genuinely is outside IR35, self-determination is far more commercially flexible than relying on an SDS from a cautious corporate client. Many contractors have historically been pushed inside IR35 by blanket end-client determinations that did not reflect the actual engagement. With the threshold change, that problem goes away for the newly reclassified cohort.
HMRC enforcement is escalating in 2026-27
HMRC's approach to IR35 enforcement has shifted markedly in 2026-27. Rather than waiting for tip-offs or targeting known problem sectors, HMRC is now running proactive compliance reviews driven by data analytics.
The mechanism works by cross-referencing multiple data sources:
- SA302 self-assessment returns (particularly Schedule D income through a limited company)
- PAYE records held by HMRC for the end-client
- Companies House filings, including director loan accounts and dividend payments
- Contract information and industry sector data
Where these data points are inconsistent — for example, a contractor receiving a single-client income through a limited company, with no employees, and no evidence of substitution — HMRC flags the case for a compliance check. With approximately 14,000 more contractors now self-determining, HMRC has specifically identified this population as a target for the 2026-27 compliance programme.
The practical implication: simply declaring outside IR35 is no longer enough. You need documentation that would survive scrutiny — a reviewed contract, records of working practices, evidence of business independence. See our piece on HMRC's escalating IR35 enforcement in 2026 for the full picture on investigation risk and penalties.
Umbrella JSL rules running in parallel
Alongside the threshold changes, Joint and Several Liability (JSL) rules for umbrella companies took effect from 6 April 2026 under the new Chapter 11, Part 2 ITEPA 2003. These are separate from IR35 but run in parallel — and they are changing contractor supply chains in ways that affect PSC contractors too.
Under JSL, if an umbrella company fails to pay PAYE and National Insurance correctly, HMRC can pursue the recruitment agency first, and then the end-client, for the unpaid tax. Agencies are responding by tightening their approved umbrella lists. Some contractors who were working through umbrellas are finding their umbrella removed from approved lists — and are being pushed to find alternatives, including limited companies.
For contractors already operating through a PSC, JSL does not directly apply to your arrangements. But the knock-on effect on agency supply chains and end-client appetite for umbrella workers may mean more PSC opportunities becoming available. Read our full guide on umbrella company JSL rules from April 2026.
Practical steps for contractors affected by the threshold change
If your end-client has been reclassified as small — or you are unsure — here is what to do:
- Confirm your client's size. Check their Companies House filings. If they meet two of the three thresholds (turnover ≤£15m, balance sheet ≤£7.5m, ≤50 employees), they are small from their first financial year ending after 6 April 2026.
- Review your contract. Does it include a genuine right of substitution (not merely theoretical)? Does the control language reflect a B2B arrangement rather than employment? Is there any mutuality of obligation language that could be problematic?
- Document your actual working practices. HMRC looks at reality, not the contract. If you are integrated into your client's organisation, use their equipment exclusively, and attend their premises every day with a fixed work pattern, that is harder to defend as outside IR35 regardless of what the contract says.
- Get a formal IR35 review. An accountant can help with structure and compliance, but a specialist IR35 reviewer — a barrister or qualified status specialist — provides the documented opinion that carries weight with HMRC.
- Keep your accounting consistent with your status. Salary and dividend extractions, contractor loans, and company accounts should all be consistent with an outside IR35 position. Your accountant should be actively checking this.
Autobooks works with limited company contractors on exactly this basis — ensuring the accounting structure supports your IR35 position, and flagging anything that looks inconsistent. Accountancy services start from £89+VAT/month.
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