How Much Professional Indemnity Cover Do You Actually Need? UK Guide

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The Number Nobody Will Give You

How much professional indemnity cover you need is a question most guides answer with “it depends” and a quote form. It does depend, but on three things that are specific and knowable: what your regulator requires, what your clients demand in writing, and what a mistake in your work could realistically cost.

Most people handle the first two and skip the third, which is the one that decides whether a bad year ends the business.

There is also a fourth question hiding inside the first three, and it changes the answer more than the headline figure does: what the limit actually means once you read the structure around it. A £1 million limit can be worth £1 million or a great deal less depending on four clauses, and this covers all of them.

1. What Your Regulator Requires

If you are regulated, this is a floor rather than a decision, and falling below it is a disciplinary matter rather than an insurance one.

The figures below come from the regulators’ own current rules, and every one of them is checkable at source. Regulatory minimums do change, so confirm with your own body before you buy or renew.

Solicitors

The SRA’s minimum terms and conditions set £2 million for each and every claim for sole practitioners and partnerships, and £3 million for each and every claim for incorporated practices, meaning recognised and licensed bodies including companies and ABSs.

Two details matter more than the figures. The limits apply to each and every claim, not in the aggregate. And defence costs carry no monetary limit under the minimum terms, which is unusually generous and means solicitors can skip the defence-costs question that the rest of this article spends a section on. Six years of run-off is also mandatory.

Financial Advisers and Insurance Intermediaries

This is where published guidance most often goes wrong, including figures you will see quoted as £1.85 million. The real position under the FCA’s IPRU-INV 13 has two separate scales.

Insurance intermediaries under the Insurance Distribution Directive rules: €1,300,380 for a single claim and €1,924,560 in aggregate per year. Those are euro figures, they have been uprated from the older €1,250,000 and €1,850,000 that still circulate, and a policy written in sterling must be at least equivalent.

Personal investment firms are on a sterling scale set by relevant income:

• Income up to £3 million: £500,000 per claim and £500,000 in aggregate
• Income above £3 million: £650,000 per claim and £1 million in aggregate
• Income above £10 million: a banded aggregate table starting at £2 million and rising to £22.5 million

There is also a cap on your excess. A policy cannot require you to pay more than £5,000 on any claim unless you hold additional capital resources against the difference, on a scale set by income and excess level.

So the figure you need depends on which permissions you hold and what you earned last year, and the commonly quoted £1.85 million is a stale euro aggregate figure for a different category of firm.

Accountants

ICAEW raised its minimum limit of indemnity from £1.5 million to £2 million with effect from 1 September 2024, applying from each firm’s first renewal after that date, with full compliance required by 1 September 2025. It can be written on an any-one-claim or an aggregate basis.

Smaller practices are on a formula instead. Firms with fees under £800,000 must hold two and a half times total income, subject to a floor of £250,000, raised from the previous £100,000. A practice billing £400,000 therefore needs £1 million rather than the headline £2 million.

Run-off is six years, and the standard was tightened from “best endeavours” to “all reasonable steps”. ACCA and AAT set their own requirements on a similar shape but different numbers, so check with whichever body you belong to. More detail on the wider obligations sits in our guide to insurance for bookkeepers and accountants.

Architects

The ARB Code requires “adequate and appropriate” insurance, and the ARB’s guidance puts a figure on it: it expects a minimum of £250,000 on an each-and-every-claim basis. That is an expectation rather than a hard rule, and fire safety and cladding claims are acknowledged as sometimes only available on an aggregate basis.

The run-off requirement is the one worth noting, because it answers a question people usually ask too late. The guidance expects six years of run-off, five in Scotland, held at the same level as your final practising year. You cannot quietly reduce the limit on the way out. It also flags that appointments executed as deeds carry a twelve-year liability period.

If You Are Not Regulated

Your floor is zero, which is not the same as needing nothing. It means factors two and three are the whole answer, and the market’s practical floor is £1 million because very little is sold below it.

2. What Your Clients Require

Larger companies, public bodies and anyone with a procurement process will specify a level in the contract, and it is frequently higher than any regulatory minimum. A corporate requiring £5 million resets your floor for that engagement regardless of what your regulator says.

The insurance clause is usually at the back, under “Insurance”, “Warranties” or a schedule of requirements. Read it for the limit, whether it says per claim or in the aggregate, and how long the obligation runs. Our guide to insurance requirements in client contracts goes through the wording in detail.

The Obligation Outlives the Contract

The clause people miss commits you to maintaining cover at the specified level for six years after completion, sometimes twelve where the contract was executed as a deed.

That constrains you for years afterwards. If you signed a £2 million six-year obligation in 2024 and drop to £1 million in 2027 to save money, you are in breach of a contract you finished three years ago. Before reducing any limit, check the obligations still running on completed work.

It is also worth setting your baseline high enough to bid for the work you want, rather than needing a fresh insurance application every time a proposal lands.

3. What Your Work Could Actually Cost

This is the calculation almost nobody does, and the one that determines whether the number is adequate rather than merely compliant.

Start With Your Liability Cap

Before estimating what a client could lose, check what you have agreed to be liable for. A contract capping your liability at the fees paid, or at a fixed sum, limits your realistic exposure to roughly that figure. A contract with no cap, or with a broad indemnity, does the opposite.

This is the most powerful lever in the whole exercise and it costs nothing to pull. Negotiating a liability cap into your contracts does more for your risk position than buying another million of cover, and it is a cheaper conversation.

Two warnings. Insurance is not a liability cap. The limit is what the insurer pays, not what you can be made to pay, and anything above it is yours. And a broad indemnity can commit you to liabilities wider than the law would impose, which most policies exclude, leaving you contractually liable and uninsured simultaneously.

Then the Realistic Loss

With the cap understood, ask what a serious error could cost your most significant client, not your average one. Claims come from the worst engagement, not the typical one.

Your fee is irrelevant to this. A £5,000 piece of advice can produce a £500,000 loss. A small integration can take a trading site down for a fortnight. Scale the estimate to the client’s exposure rather than your invoice.

Include consequential loss, because claims rarely stop at the cost of fixing the error. Lost profit, business interruption and third-party costs the client incurred because of your mistake all feature routinely.

Defence Costs Are the Claim You Will Actually Have

Here is the realistic shape of a professional indemnity claim for a small business: a solicitor’s letter, eighteen months of correspondence, expert reports, and either a commercial settlement or a withdrawal. No damages award at all.

Defending a contested claim can run well into six figures, and it does so whether or not you did anything wrong. For most sole traders and small practices the question is less whether a client could lose millions and more whether you could fund two years of defence. That is an argument for how defence costs are treated, covered next, as much as for a bigger limit.

What the Limit Cannot Buy

Regulatory fines are generally not insurable in the UK as a matter of public policy, so they cannot form part of what your limit protects. If the realistic bad outcome in your work is a penalty on you rather than a loss to a client, a larger limit does not address it.

How Much Professional Indemnity Cover You Really Have

Four clauses determine whether a stated limit means what it appears to mean. Ask about all four before comparing prices, as covered in our guide to comparing business insurance quotes.

Any One Claim or Aggregate

Any one claim pays up to the limit for each separate claim, however many arrive in the year. Three claims against a £1 million any-one-claim policy can each draw up to £1 million.

Aggregate makes the limit the total for the year. Two £600,000 claims against £1 million aggregate leaves you badly short on the second.

Aggregate is cheaper and usually adequate at low claim frequency. If you serve several substantial clients at once, or give the same advice to multiple parties, any one claim is materially better protection.

The Aggregation Clause

This is the clause nobody reads and it can reverse the comparison above. Aggregation determines when several claims are treated as one claim, typically where they arise from one act, one source or a “series of related matters or transactions”.

It cuts both ways. On an any-one-claim policy, fifty claims arising from one systemic error aggregated into a single claim means one limit covers all fifty, and one excess. If they are not aggregated, you get fifty limits and fifty excesses. Which result you want depends on the size of the claims against the size of the limit, and the wording is what decides it. The Supreme Court has considered the phrasing, so these disputes are real rather than theoretical.

If your work involves giving the same advice or using the same template across many clients, ask your broker specifically how the aggregation clause reads.

Defence Costs Inside or Outside

Inside the limit means legal fees erode the same pot as the settlement. A £400,000 defence on a £1 million limit leaves £600,000 for the claimant.

Outside the limit, or “costs in addition”, means the insurer pays both separately. It is the better structure and worth paying for, particularly where claims are likely to be contested. Watch for a middle position, where costs are in addition but paid proportionately once a claim exceeds the limit.

Given the previous section, this clause often matters more than another million of limit.

The Excess

Rarely mentioned in articles about how much cover to buy, and it belongs here. Check the amount, whether it applies per claim or per policy year, and whether it applies to defence costs as well as damages. An excess that bites on costs means you fund the early stages of every dispute yourself.

The Claims-Made Twist

Professional indemnity is written on a claims-made basis, which has a consequence for limits that catches people out.

The limit that responds is the one in force when the claim is made, not when you did the work. Carry £5 million while delivering a major project, reduce to £1 million the following year, and a claim about that project is subject to £1 million.

So reducing your limit retrospectively reduces the cover behind everything you have ever done. If cost is the pressure, shortening a run-off period or adjusting the excess is usually a safer lever than cutting the limit, and run-off cover needs the same thinking when you stop.

What Extra Limit Actually Costs

Worth knowing before you economise: premium does not scale linearly with limit. The first million carries most of the cost because most claims are small, and each additional layer is progressively cheaper per pound of cover. Doubling the limit rarely doubles the premium.

The practical consequence is that people under-insure to save considerably less than they imagine. Ask for the £2 million and £5 million figures alongside the £1 million before deciding, because the gap is often smaller than the anxiety about it.

For high limits, the market usually builds them in layers: a primary policy topped by an excess layer. Regulated firms do this routinely, and it is cheaper than buying a single large primary policy. Any specialist broker can price it.

A Framework

1. Find your regulatory minimum at source, and note whether it is per claim or aggregate and whether a formula applies to your income
2. Check the highest figure your contracts require, including obligations still running on completed work
3. Check your liability caps, and negotiate them where they are missing
4. Estimate the realistic worst loss for your most significant client, including consequential loss
5. Decide on the structure: any one claim where you can, costs in addition where you can, and read the aggregation clause
6. Take the highest of those figures, then price the layer above it before settling

If the exposure calculation produces the largest number, that is your answer, because that is the figure that would actually finish the business.

FAQ

Do I need professional indemnity as a sole trader?

There is no general legal requirement unless you are regulated. Clients require it routinely, and without it any claim comes from your own assets with no company in between. For anyone giving advice or delivering professional work, a base level is straightforward risk management rather than a luxury.

Can I reduce my cover between contracts to save money?

Be careful, for two reasons. Because the policy is claims-made, the reduced limit applies to claims about all your past work, not just future work. And a contractual obligation to maintain a level for six years after completion survives the end of the contract. Check both before reducing anything.

Is £1 million enough?

It is the market’s practical floor and it is adequate for a great deal of low-value work. It is not adequate if your clients are substantially larger than you, your contracts are uncapped, or a single error could stop a client trading. The test is the realistic loss, not the round number.

Does the limit include legal costs?

It depends on the policy, which is exactly why it is worth asking. Costs inside the limit means a contested claim can consume most of your cover before any settlement. Under the SRA minimum terms defence costs are unlimited, but that is a solicitors-only feature.

What is run-off cover and do I need it?

Cover for claims made after you stop trading about work done while you were active. Because the policy is claims-made, cancelling leaves your whole back catalogue uninsured. Regulated professions generally mandate six years, and architects must hold it at the same level as their final practising year.

Does professional indemnity cover everything a client might claim?

No. It covers financial loss from your advice and work: errors, omissions, negligence and breach of professional duty, sometimes extending to defamation and intellectual property. Injury and property damage are public liability. Deliberate acts and your own regulatory fines are not covered at all.

How Much Professional Indemnity Cover You Need: The Bottom Line

Start at your regulator’s actual published figure rather than a number from an article, and note that several of them are formulas rather than flat limits: ICAEW’s two and a half times income for smaller practices, the FCA’s income bands, the SRA’s split between £2 million and £3 million by structure.

Then take the highest of your regulatory floor, your contractual requirements and your realistic worst loss. Negotiate a liability cap before buying more cover, because it is cheaper and does more.

And read the four clauses around the limit. Any one claim rather than aggregate, costs in addition rather than inside, an aggregation clause you have actually seen, and an excess that does not bite on defence costs. Those four decide what a limit is worth, and the price difference between getting them right and getting them wrong is usually smaller than people expect.

This article is general information about insurance and UK regulation, not advice, and it does not take account of your circumstances. Regulatory minimums, policy wordings and limitation periods change. Verify your own requirement with your regulator and speak to a specialist FCA-authorised broker before relying on anything here.