How much is professional indemnity insurance for tax advisers?
Reviewed by Matthew Bartlett, Director, Apex Insurance Brokers Limited · Last reviewed 2026-08-05
In short: There is no fixed price for a tax adviser's professional indemnity insurance. Your premium is calculated from your fee income, the type of tax work you do, the cover limit you choose (commonly £1m, £2m or £5m), your claims history and how you manage risk. A sole practitioner doing straightforward compliance work sits at one end of the scale; a firm advising on complex planning and larger clients sits well above it.
If you advise clients on tax, professional indemnity (PI) insurance is the cover that responds when a client alleges your advice, calculation or filing caused them a financial loss. It is one of the most searched-for costs in the profession — and one of the hardest to pin to a single number, because insurers price each firm on its own risk profile rather than a rate card.
This page explains the drivers that actually move a tax adviser's PI premium, so you can see why quotes vary and what you can do to influence yours.
Why there is no single price
PI premiums are underwritten, not listed. An insurer looks at the likelihood that a claim will be made against you and how expensive that claim could be to settle. Two tax advisers with identical turnover can pay very different amounts if one handles HMRC enquiries and R&D claims while the other only prepares personal tax returns. The premium reflects the risk you actually carry.
The drivers that move your premium
These are the factors an underwriter weighs when pricing PI cover for a tax adviser:
- Fee income (turnover). Your annual fees are the single biggest rating factor. Higher fee income generally means more clients, more advice given and more potential exposure — so the premium rises broadly in step with it.
- The type of tax work you do. Routine compliance — personal and corporate tax returns, VAT, payroll — is viewed as lower risk than advisory and planning work. Areas such as tax mitigation schemes, R&D tax credit claims, complex reliefs, trusts and estates, or advice to high-net-worth clients carry more exposure and cost more to insure.
- The cover limit you choose. A higher limit of indemnity (see below) increases the insurer's maximum liability, so it increases the premium — though rarely in a straight line.
- Your claims and complaints history. A clean record works in your favour. Past claims, notified circumstances or a pattern of complaints signal higher risk and push the price up.
- Client and sector profile. A handful of very large clients concentrates risk; so does heavy exposure to a single volatile sector. A broad spread of modest clients is generally viewed more favourably.
- Qualifications and controls. Membership of a recognised body — such as the CIOT, ATT, ICAEW, ACCA or AAT — along with documented review procedures, engagement letters and file discipline all reassure underwriters.
- Retroactive cover and past work. PI is written on a "claims-made" basis, so it must cover advice given in earlier years, not just work done during the policy period. The length of that retroactive period and your firm's history affect the price.
Want a figure based on your actual firm rather than a guess? Tell us your fee income and the work you do, and we'll quote it properly.
Get a PI quote →Choosing a cover limit: £1m, £2m or £5m
The limit of indemnity is the most the policy will pay in respect of a claim. Choosing it is a judgement about the largest realistic loss a client could suffer from your advice — not just the size of your fees. The table below sets out how the common limits tend to be used.
| Cover limit | Typically suits |
|---|---|
| £1m | Sole practitioners and small firms doing mainly compliance work for individuals and small businesses. |
| £2m | Growing firms, those with larger corporate clients, or advisers doing a mix of compliance and planning work. |
| £5m+ | Established practices handling complex advisory work, high-value clients, or work where a single error could trigger a large HMRC assessment or client loss. |
Your professional body may set a minimum limit tied to your fee income — the CIOT, ATT and other bodies have PI requirements for members in practice — so check your body's rules before you decide. A limit that satisfies the minimum may still leave you underinsured relative to the losses your advice could cause, which is a conversation worth having with a broker.
Beyond the limit: excess and terms
Two firms with the same limit can still pay different premiums because of the policy excess (the amount you contribute to each claim) and the breadth of the wording. A higher excess usually lowers the premium but increases what you pay if a claim lands. Extensions — such as cover for defence costs, loss of documents, or dishonesty of employees — also affect price. The cheapest headline figure is not always the best value once the terms are compared like for like.
How a broker helps you get the right price
Because PI for tax advisers is underwritten individually, presentation matters. A specialist broker helps you in three practical ways:
- Presenting your firm well. Clearly describing your work, controls and client mix helps underwriters price you accurately rather than defensively.
- Accessing the right insurers. Not every insurer wants tax-advisory risk, and appetite shifts year to year. A broker knows who is competitive for your profile.
- Matching cover to risk. The right limit, excess and extensions for your actual exposure — not a one-size template.
To get a quote built around your firm, start a PI proposal with Apex and we'll do the rest.
Common questions
Is PI insurance a legal requirement for tax advisers?
There is no single statute making PI compulsory for all tax advisers, but most professional bodies — including the CIOT and ATT — require members in practice to hold it. If you are a member, your body's rules effectively make it mandatory, and they may set minimum terms.
Does more fee income always mean a higher premium?
Generally yes, because fee income is the main rating factor — but not always proportionally. The type of work behind that income matters just as much. Growth in low-risk compliance fees affects the price differently from growth in complex advisory work.
Can I reduce my PI premium?
Often, yes. A clean claims record, clear engagement letters, documented review procedures, a sensible excess and an accurate presentation of your work can all help. A broker can advise on which levers genuinely move the price for a firm like yours.
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This guide is general information, not advice on a specific policy or a substitute for your policy wording.