IR35 Insurance: What It Covers and Whether You Need It

IR35 insurance: what it covers and whether you need it

If you contract through your own limited company, you will have seen "IR35 insurance" advertised by accountants, insurers and umbrella-adjacent services. It is worth being clear from the outset: this is not a government scheme, and there is no statutory product of this name. Official sources dealing with the off-payroll rules, including HMRC's guidance on understanding off-payroll working (IR35), do not reference an "IR35 insurance" product at all. What they describe instead is how the rules work, how HMRC opens enquiries, and what happens if HMRC decides IR35 applies. Insurance is a commercial product sitting alongside that framework, not a legal requirement.

This article explains what IR35 insurance typically covers, why contractors buy it, and where to find the primary sources so you can form your own view. It is general education, not advice on your own position.

What the off-payroll rules actually say

HMRC's guidance explains that the off-payroll rules (commonly known as IR35) apply where a worker provides services to a client through an intermediary, such as a personal service company, and would have been regarded as an employee for tax purposes if they had contracted directly with the client (gov.uk). Since the 2017 and 2021 reforms, medium and large private sector clients (and all public sector clients) are generally responsible for making that determination and issuing a Status Determination Statement (SDS). Where a listing states a role is "outside IR35", that is the client's assessment, evidenced through their SDS, not a status confirmed by this platform or by any job board.

Where a contract is determined to be inside IR35, the fee-payer must deduct Income Tax and employee National Insurance contributions from payments to the intermediary, and account for employer NICs and the Apprenticeship Levy where applicable (gov.uk).

What happens if HMRC opens an enquiry

HMRC uses what it describes as a risk-based approach when deciding whether to open an IR35 enquiry (gov.uk). This means enquiries are not opened at random on every contractor; HMRC targets cases it assesses as higher risk based on the information available to it.

If HMRC concludes that IR35 did apply to an engagement, the worker becomes liable for the tax and National Insurance due, plus interest, and potentially penalties if HMRC considers there was a lack of reasonable care in reaching the original status decision (gov.uk). This is the exposure that IR35 insurance products are typically designed to respond to.

Separately, HMRC has published detail on how PAYE liability is calculated where off-payroll rules were not correctly applied. From 6 April 2024, legislation allows tax and NICs already paid by a worker or their intermediary on the same income to be set off against a later PAYE liability assessed against the deemed employer, where that liability arises from errors in operating the rules for deemed direct payments made since 6 April 2017 (gov.uk). This set-off mechanism reduces the risk of the same income being taxed twice across worker and fee-payer, but it does not remove the underlying compliance risk or the need for evidence that a role was correctly assessed.

What IR35 insurance cover typically includes

Commercial IR35 insurance products (sometimes bundled into broader tax investigation or professional fees cover) generally aim to address two separate things:

• Investigation costs: the fees of an accountant or specialist adviser representing the contractor during an HMRC enquiry, which can run for months.
• Tax liability cover: in some products, a contribution towards the tax, NICs, interest and penalties if HMRC ultimately finds IR35 applied.

Cover terms vary significantly between providers, and it is common for tax liability cover to be more restrictive, sometimes conditional on an independent contract review having been carried out before the policy was taken out, or on the contractor having taken reasonable care in the original status decision. Because HMRC's own penalty test is about "reasonable care" (gov.uk), an existing contract review or SDS provided by the client can be relevant evidence in that context, though it is evidence provided by the client rather than a determination made by any insurer or platform.

CEST and contract reviews are not the same as insurance

Contractors sometimes ask whether running HMRC's Check Employment Status for Tax (CEST) tool, or getting a contract reviewed, replaces the need for insurance. It does not. CEST is a free tool HMRC provides to help work through the status question, alongside the wider off-payroll working guidance collection. HMRC has previously said it stands by CEST results where the tool has been used correctly and honestly, but a CEST output is not determinative in the sense of being immune from later challenge; it is one input into the assessment, not a guarantee. A contract review from a specialist is similarly useful evidence of how the engagement was assessed at the time, but again it is evidence, not proof of status, and status ultimately depends on the actual working practices between contractor and client, considered against principles such as control and the right of substitution (as explored in cases such as PGMOL).

Deciding whether cover is right for you

Whether IR35 insurance is worthwhile depends on factors specific to each contractor: the sector, the client's own IR35 processes, whether an SDS or contract review already exists, the contractor's risk appetite, and the cost of the cover itself against the potential exposure described in HMRC's enquiry guidance. These are commercial and personal decisions, and this article does not recommend a specific policy or provider.

For contractors weighing this up, it is generally sensible to speak to a qualified IR35 contract reviewer or a contractor accountant who deals with these products regularly, and to keep any SDS or review documentation the client has issued. Questions about broader employment status and worker rights, separate from the tax question, fall to the Fair Work Agency (FWA) rather than to HMRC or to insurance providers.

If you are assessing new contracts, you can browse outside-IR35 contracts currently listed, or check day-rate benchmarks to see how rates compare across sectors before weighing up whether additional cover makes sense for your situation.

This platform does not determine, verify, or warrant IR35 status; the SDS is the client's legal responsibility. Contractors should take their own advice and consider IR35 insurance.