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Many contractors hold IR35 insurance without being entirely clear on what it actually covers. The marketing around these products tends to emphasise the reassurance rather than the detail, and the detail is where the important distinctions sit.

This guide sets out exactly what IR35 insurance does and does not cover, the conditions that apply to any claim, and what you need to have in place for a policy to be worth the paper it is written on.

The two things IR35 insurance can cover

All IR35 insurance products cover one or both of the following.

Enquiry defence costs. If HMRC opens a compliance check into your IR35 status, the process involves responding to detailed questionnaires, providing contracts and invoices, explaining your working practices, and potentially attending a First-tier Tribunal. None of that is something you handle yourself when you are insured. The policy covers the cost of specialist tax advisers and, where necessary, legal representation to manage the process on your behalf. Defence cost cover is typically capped at £50,000 or £100,000 per claim depending on the policy.

Tax liability. If HMRC wins the investigation and determines that your engagement was inside IR35, the resulting demand covers unpaid income tax and National Insurance for the period under review, plus interest and penalties. Tax liability cover pays that demand up to the indemnity limit you chose when you bought the policy. This is what distinguishes a comprehensive policy from an entry-level one: legal defence cover transfers the cost of the fight; tax liability cover also transfers the cost of losing.

These two elements are sold separately in the market. Entry-level legal protection policies cover defence costs only. Comprehensive tax liability policies cover both. The difference in premium between them reflects the size of the risk being transferred.

What IR35 insurance does not cover

Understanding the exclusions is as important as understanding what is included. The following are standard across most policies in the market.

Existing investigations. A policy must be in place before HMRC makes contact about an enquiry. No insurer will cover an investigation that is already under way at the point you take out a policy.

Deliberate non-compliance. If HMRC demonstrates that you knowingly misrepresented your working arrangements or acted fraudulently, insurers will not pay a claim. The policy covers genuine disputes about status, not the cost of concealing an arrangement that was never outside IR35 in the first place.

Working practices that contradict the contract. This exclusion has significant practical consequences. Most policies require that you have taken reasonable care over your IR35 position. Where the insurer or HMRC can demonstrate that your actual working practices bore little resemblance to what your contract said, the reasonable care condition may not be satisfied. The Autoclenz Ltd v Belcher [2011] UKSC 41 principle established that tribunals look through written contracts to the reality of the working arrangement. Insurers apply the same scrutiny when assessing a claim.

Professional advice that was ignored. If you obtained a status assessment that indicated a borderline or inside position and proceeded regardless, insurers may treat the claim as falling outside the policy conditions.

Periods without cover. The policy covers investigations into periods during which the policy was active. If you operated outside IR35 for three years and only took out insurance in year two, the year one period may not be covered. This is why continuous annual cover matters.

Future contracts. An IR35 insurance policy does not guarantee your status on any future engagement. Each new contract starts a fresh status assessment.

The reasonable care requirement in detail

Reasonable care is the condition most likely to determine whether a claim succeeds. HMRC uses the concept to assess whether a taxpayer has taken appropriate steps to understand and comply with their tax obligations. Insurers use it in parallel: a contractor who has never considered their IR35 position in any structured way, never reviewed their contract against the relevant case law, and never documented their working practices is in a weaker position than one who has done all three.

The practical implication is that IR35 insurance and IR35 compliance are not separable. A policy held on top of a genuinely weak compliance position is not full protection. If HMRC wins an investigation and the insurer then scrutinises how the contractor approached their status, gaps in that record can affect the outcome of the claim.

This is not a theoretical risk. Multiple sources in the contractor insurance market confirm that if a contractor has never obtained a formal status assessment and HMRC wins, an insurer may argue that reasonable care was not taken, potentially affecting coverage under a full-cover policy.

What the PGMOL judgment means for policyholders

The Supreme Court ruling in HMRC v Professional Game Match Officials Ltd [2024] UKSC 29 narrowed one of the most commonly relied-upon contractor defences. The court held that mutuality of obligation and sufficient control can exist within each individual engagement, even where there is no obligation between engagements. The old argument that short contracts or cancellation clauses removed mutuality of obligation has weakened significantly as a result.

The practical consequence for insurance is that more engagements now carry a realistic investigation risk than contractors may have assumed. The in-business-on-your-own-account factors in the third limb of the Ready Mixed Concrete (South East) Ltd v Minister of Pensions [1968] test carry more weight than before. A policy sized on the assumption that your MOO position was robust may be undersized if that defence is no longer available.

What a policy does not replace

IR35 insurance covers the financial consequences of an investigation. It does not perform the status assessment that determines whether an investigation poses a real threat, and it does not improve a weak underlying compliance position.

Those two things sit before the insurance decision, not alongside it. Knowing where your contract and working practices stand across the dimensions tribunals actually consider (personal service, control, mutuality of obligation, financial risk, integration, and being in business on your own account) is the foundation on which an insurance decision makes sense.

IR35 Verdict analyses your contract against those six dimensions, grounded in the case law that tribunals apply, and gives you a probability-based assessment rather than a binary verdict. That assessment tells you which areas of your engagement carry the most risk, and which policy conditions are most likely to matter to you.

Check your contract before you rely on a policy

How this series fits together

This article covers what each policy type includes and the conditions that apply to any claim. The first article in the series, what an HMRC IR35 investigation actually costs, sets out the scale of the underlying risk. The second, how much does IR35 insurance cost, breaks down what drives the premium and how to size your cover limit.

The honest summary

IR35 insurance covers specialist representation during an HMRC IR35 enquiry and, with a comprehensive tax liability policy, the tax, National Insurance, interest, and penalties if HMRC wins. Every policy has conditions: coverage requires that the policy was in place before HMRC contacted you, that you have taken reasonable care over your IR35 position, and that your working practices did not materially contradict your contract.

A policy is only as strong as the compliance position underneath it. Insurance manages residual risk once the underlying compliance position is understood; it does not substitute for that understanding. To compare the main providers once you know what you need, see our provider guide.

Frequently asked questions

Does IR35 insurance cover both defence costs and tax liability?

Not automatically. Legal defence cover pays only for the professional fees involved in defending an HMRC enquiry. Tax liability cover includes defence costs and also pays any tax, National Insurance, interest, and penalties if HMRC wins. They are separate product types with different premiums.

What is the reasonable care condition in IR35 insurance?

Reasonable care is the standard HMRC and insurers use to assess whether a contractor approached their tax position appropriately. In practice, it means having considered your IR35 status in a structured way, ideally with a documented assessment. Contractors who cannot demonstrate reasonable care may find it affects their claim.

Can I take out IR35 insurance after HMRC contacts me?

No. Cover must be in place before HMRC opens an enquiry. Once HMRC makes contact about an IR35 investigation, no insurer will accept a new policy for that engagement.

Does IR35 insurance cover all the years HMRC can investigate?

It covers the years during which you held an active policy. If you operated outside IR35 for a period before taking out insurance, that earlier period may not be covered, and the same applies to any gap in cover between policies.

Does IR35 insurance guarantee my outside IR35 status?

No. Insurance covers the financial consequences of a disputed status. It does not determine your status, improve a weak compliance position, or prevent HMRC from investigating. Status is determined by the facts of your engagement assessed against employment status case law.