IR35 reform: five years on — what actually changed for contractors

What the reforms actually changed

For contractors unfamiliar with IR35 or who've heard it mentioned but want a clear summary:

• Before April 2021: Contractors operating via limited companies assessed their own IR35 status. If you determined you were outside IR35, you paid corporation tax and dividend tax. Your client or agency bore no PAYE responsibility.
• After April 2021: Medium and large clients became responsible for the assessment and must issue a Status Determination Statement (SDS) to each contractor. The fee-payer (client or agency) became liable for PAYE and NICs where inside IR35.

What didn't change: The underlying legislation, the tests for employment status (control, mutuality of obligation, substitution, financial risk), or the ability to operate via a limited company outside IR35.

What happened immediately after April 2021

The market response was swift and predictable:

• Many clients took the risk-averse path: PSC bans or blanket inside determinations
• Umbrella companies grew rapidly, absorbing contractors pushed out of limited company arrangements
• Contractors' take-home pay fell — in many cases significantly
• IT, financial services, and consultancy were disproportionately affected

The Truss moment — when IR35 almost disappeared

In September 2022, the Truss-Kwarteng Mini-Budget announced full repeal of both the 2017 and 2021 IR35 reforms. For the first time in years, contractors saw a path back to the pre-2021 status quo. The hope lasted three weeks. When Jeremy Hunt became Chancellor, the decision was reversed immediately. IR35 remains in force.

The episode showed how politically contested IR35 remains — and that a change of government still wouldn't be guaranteed to reverse it. But it also raised contractor hopes in a way that nothing since has matched.

What's actually improved since 2021

The picture has shifted, though not uniformly:

Compliance understanding has matured

Clients and agencies understand the rules better now. Blanket policies are being reviewed. Genuine outside IR35 assessments are becoming more rigorous and more available. Where the 2021–2022 response was panic, the 2024–2026 response is calibration.

Set-off rules (April 2024) prevent double taxation

If a determination is later found to be wrong, you're no longer at risk of being taxed twice on the same income. This removed a significant downside risk for outside IR35 engagements and made the commercial case for those arrangements clearer.

Small company threshold uplift (April 2026)

Around 14,000 more companies are now reclassified as "small" and therefore OPW-exempt. For contractors at those clients, outside IR35 determination reverts to the contractor's own PSC — as it was pre-reform. This is material for contractors in smaller client organisations.

JSL rules for umbrella companies (April 2026)

Agencies and end clients are now jointly liable for umbrella PAYE failures. This is forcing serious review of umbrella supply chains, with some clients and agencies moving back to PSC-based engagements as a result.

PGMOL First-tier Tribunal verdict (May 2026)

The PGMOL case reached its conclusion on 1 May 2026, with the referees winning on outside IR35 status. The tribunal clarified that satisfying the irreducible minima of mutuality and control doesn't create a presumption of employment — and that the quality of mutuality matters. For contractors, this means a well-structured outside IR35 position with genuine choice and independence now has significantly clearer legal backing.

Where the contractor market stands in 2026

Honest assessment:

• Outside IR35 is more available than it was in 2021–2023. The appetite for blanket policies has diminished.
• Umbrella is still the default in many sectors but under increasing commercial pressure from employer NIC rises and JSL liability rules.
• Financial services PSC bans remain widespread but are being selectively reviewed as the market matures.
• HMRC compliance activity continues. Having a well-documented, properly structured outside IR35 position matters more than ever.
• The case for operating via a limited company — for contractors in a position to do so — is stronger in 2026 than it was in 2022 or 2023. Tax efficiency has improved, the downside risk has decreased, and operational support (from accountants) has become more specialist.

Should you be on a limited company in 2026?

Not a blanket yes. But the conditions that made umbrella feel necessary or safe for many contractors are shifting:

• If you're currently on umbrella, working for a client who isn't subject to the off-payroll rules (a small company, or from April 2026 a newly reclassified small company), or if your role would genuinely support an outside IR35 determination, the take-home pay difference is significant enough to be worth a conversation.
• If you've been on umbrella for 3+ years because of perceived risk, the set-off rules and the PGMOL ruling have shifted that risk calculation. The downside of being wrong is now materially lower.
• If your client has blanket policies but you know they're reviewing them, now is the time to press the case for individual assessment.

The key question is always the same: does your specific engagement support an outside IR35 determination? If it does, the tax efficiency of a limited company is hard to beat. If it doesn't, umbrella is a cleaner arrangement than forcing an outside IR35 position you can't defend.