At the start of 2025, 819,000 UK small and medium-sized businesses worked in professional, scientific and technical services, according to the Department for Business and Trade’s business population estimates for 2025. It was also the sector that grew most in a single year, adding 65,000 businesses. Every one of those consultants, designers, accountants and advisers sells judgement, and judgement can go wrong.
Professional indemnity insurance is the cover that pays when a client says your advice or work cost them money. This guide explains what it covers, who must hold it by law or regulation, how claims-made policies trip people up, and how to choose a sensible limit for your business in 2026.
Quick Answer
Professional indemnity insurance (PI or PII) protects UK businesses and freelancers when a client claims that negligent advice, an error, or a missed deadline caused them a financial loss. The policy pays legal defence costs and any compensation awarded, up to your limit of indemnity. There’s no general legal requirement to hold it. Even so, solicitors, ICAEW-regulated accountants, FCA-authorised brokers, RICS-regulated surveyors and registered health professionals must have it, and architects are expected to. Many client contracts also demand it. Most UK policies are written on a claims-made basis, so the policy must be live when the claim arrives, not just when you did the work. That’s why run-off cover matters when you retire, sell or close a business.
Key Takeaways
- PI covers financial loss caused by your professional advice or work, including defence costs.
- It doesn’t cover injury or property damage. Public liability and employers’ liability handle those.
- The SRA requires solicitors to hold at least £2 million per claim, or £3 million for recognised and licensed bodies.
- Claims-made policies only respond if cover is in force when the claim is made.
- Set your limit by your largest contract and worst realistic mistake, not by the cheapest quote.
What Is Professional Indemnity Insurance?
Professional indemnity insurance is a business policy that responds when a client, or sometimes a third party, alleges you were negligent in the professional service you provided. Financial is the key word here. The client says your work left them out of pocket, and they want you to pay.
Picture a marketing consultant whose campaign breaches advertising rules and forces a client to pull a product launch. Or a bookkeeper who files a VAT return late, landing the client with HMRC penalties. Both could face a claim, even if they did nothing deliberately wrong.
Defending that claim costs money before anyone decides who was right. Solicitors’ fees, expert reports and court costs can add up fast. A PI policy pays those costs and any settlement or award, minus your excess.
Who PI is designed for
Any business that gives advice, designs something, or provides a skilled service benefits from it. That includes consultants, IT contractors, designers, engineers, recruiters, marketers, accountants, surveyors, architects and coaches. Freelancers working through their own limited company are just as exposed as larger firms, and often more so, because one claim can wipe out a year’s profit.
What Professional Indemnity Insurance Covers
Policy wordings vary, so always read the schedule and the exclusions. Most UK PI policies include some or all of the following:
| Usually covered | Example |
|---|---|
| Professional negligence | Incorrect advice that leads a client to a costly decision |
| Errors and omissions | A calculation mistake in an engineering or financial report |
| Legal defence costs | Solicitor and expert fees, even if the claim fails |
| Breach of confidentiality | Accidentally sharing a client’s commercial data |
| Unintentional IP infringement | Using an image or design you wrongly believed was licensed |
| Defamation | Content you produced for a client that damages someone’s reputation |
| Lost or damaged documents | The cost of reconstructing client files you lost |
What PI does not cover
PI is not a catch-all business policy. These risks sit elsewhere:
- Injury or property damage to the public: that’s public liability insurance.
- Injury to your own staff: that’s employers’ liability, which most UK employers must hold by law with at least £5 million of cover.
- Deliberate or dishonest acts: fraud and wilful wrongdoing are excluded.
- Fines and penalties imposed on you: regulators’ fines generally aren’t insurable.
- Promises beyond the law: liability you take on only because a contract says so, such as an uncapped indemnity, is often excluded.
- Claims you knew about before buying: known circumstances must be disclosed, and they’re usually excluded.
Sole traders who meet clients in person often need both PI and public liability. Our sole trader insurance guide explains how the two fit together.
Is Professional Indemnity Insurance a Legal Requirement?
There’s no general UK law that forces every business to buy PI. In practice, though, three forces make it compulsory for many firms: regulators, professional bodies, and client contracts.
Professions where PI is compulsory or expected
| Profession | Requirement (as of October 2026) |
|---|---|
| Solicitors (SRA-regulated) | At least £2 million per claim, or £3 million for recognised and licensed bodies, plus six years of run-off cover |
| ICAEW accountants with a practising certificate | Cover meeting ICAEW’s PII Regulations and minimum approved wording |
| FCA-authorised intermediaries | Many insurance, mortgage and investment firms must hold PII under FCA rules |
| Architects | Expected to hold adequate insurance under Standard 4 of the ARB Code of Conduct |
| RICS-regulated surveyors | PII required for regulated firms |
| HCPC-registered health professionals | A professional indemnity arrangement is a condition of registration |
The solicitor figures come from the SRA’s minimum terms for solicitors’ indemnity insurance, which also say defence costs must have no monetary cap. For accountants, the ICAEW PII Regulations were significantly amended in September 2024, with higher limits and new run-off rules. Check your own regulator’s current rules before renewal, because minimums change.
Contracts make PI compulsory for everyone else
For most consultants, the real trigger is a contract. Public sector frameworks, larger corporates and recruitment agencies routinely ask for evidence of PI before work starts. Limits of £1 million to £5 million are common asks, and some contracts specify more.
Read the insurance clause before you sign. If a client asks for £5 million and you hold £1 million, you’re in breach from day one. Your broker can often raise the limit for a single contract, which is usually cheaper than raising it across the whole policy.
How Claims-Made Cover Works (and Why It Matters)
This is the part most small firms misunderstand. Nearly all UK PI policies are written on a claims-made basis. The policy that pays is the one in force when the claim is first made against you, not the one in force when you did the work.
Mistakes in professional work can surface years later. A structural report from 2023 might only be challenged in 2027, when cracks appear. If your cover lapsed in 2025, you’d face that claim uninsured.
Three terms you need to know
- Retroactive date: the earliest date of work the policy will cover. Keep it as far back as possible when you switch insurers, ideally to the date you started trading.
- Notification of circumstances: if you spot something that could become a claim, tell your insurer during the policy period. That locks the potential claim to the current policy.
- Run-off cover: cover you buy after you stop trading, retire, sell up or close a company. It protects you against claims about past work. Solicitors must have six years of it under SRA rules, and many other professionals choose a similar period.
Limitation periods explain why run-off matters. In England and Wales, many contract and negligence claims can be brought up to six years after the cause of action. Some latent damage claims can arrive later still.
How Much Professional Indemnity Insurance Costs
Premiums vary too widely for a single average to mean much. A low-risk freelance copywriter and a structural engineer can both buy PI, but the engineer’s premium may be many times higher. Insurers price on the size and likelihood of a claim, so the same limit can cost very different amounts.
| Pricing factor | Effect on your premium |
|---|---|
| Profession and type of work | Construction design, financial advice and legal work cost far more to insure than general consultancy |
| Limit of indemnity | Higher limits cost more, though each extra million usually costs less than the first |
| Turnover and fees | More work means more exposure |
| Claims history | Past claims and notified circumstances push prices up |
| Where clients are based | Work for US or Canadian clients often costs more or needs special terms |
| Excess | A higher excess lowers the premium but raises your share of each claim |
Remember tax on top. Insurance Premium Tax applies at the standard rate of 12% to most UK business insurance, including PI, and quotes don’t always make that obvious.
Treat PI as a fixed overhead and build it into your day rate. If cash is tight, our guide to cash flow tips for small business owners covers how to spread annual costs like insurance without squeezing working capital.
How to Choose the Right Limit of Indemnity
The limit is the most an insurer will pay. Choosing it is a business decision, not a box to tick, so work through these steps.
- Start with contracts. Note the highest PI limit any current or likely client requires. That’s your floor.
- Size your worst realistic mistake. Ask what a client could lose if your work failed badly, including their lost profits and the cost of fixing your work.
- Check how defence costs sit. “Costs in addition” means legal fees are paid on top of the limit. With “costs inclusive” wording, they eat into it, so you may need a higher figure.
- Choose the basis of the limit. An “any one claim” limit resets for each claim. By contrast, an “aggregate” limit is the most paid for all claims in the policy year combined.
- Set an excess you can afford. Pick an amount you could pay from reserves several times in a year without trouble.
Many small consultancies settle on £1 million any one claim with costs in addition. Higher-risk or larger firms often need £2 million to £5 million or more. A specialist broker can compare wordings, not just prices, and that matters more than a small saving.
Common Mistakes With Professional Indemnity Cover
Most uninsured PI losses come from avoidable errors, not from rare disasters. These are the ones that catch UK small businesses most often.
- Cancelling when you close the business. Claims about old work can arrive years later. Without run-off cover, you could face them personally, depending on your business structure.
- Losing your retroactive date. Switching insurers without carrying over the retroactive date can leave past work uninsured.
- Admitting liability. Most policies forbid you from accepting blame or offering compensation without the insurer’s consent. Apologising helpfully can still breach that condition.
- Late notification. Sitting on a client complaint until it becomes a formal claim can give the insurer grounds to reduce or refuse payment.
- Poor disclosure. The Insurance Act 2015 requires a fair presentation of the risk. Leaving out a past dispute or a new high-risk service line can come back to bite you.
- Signing uncapped contracts. If you agree to unlimited liability, your PI limit won’t stretch to match it. Negotiate liability caps linked to your fees or your insurance limit.
Your business structure affects how far a claim can reach. A sole trader’s personal assets are exposed, whereas a limited company offers a layer of separation. Our guide on how to register as a sole trader covers the trade-offs, but company directors can still be pursued personally in some cases.
How to Buy Professional Indemnity Insurance
Buying PI takes an afternoon if you prepare. Gather your turnover figures, a clear description of your services, your client sectors, and details of any past claims or complaints.
- Check what your regulator, professional body and key contracts require.
- Get quotes through a broker who knows your profession, or a reputable direct insurer for simple risks.
- Compare the wording: retroactive date, defence costs basis, territorial limits and exclusions.
- Answer the proposal form fully and honestly, including anything you’re unsure about.
- Keep your certificate handy, since clients will ask for it, and diarise renewal well before expiry.
Tell your insurer mid-term if your services change. Moving from general consultancy into, say, tax advice or design work can fall outside your original cover.
Frequently Asked Questions
Do I need professional indemnity insurance as a freelancer?
It’s not a legal requirement for most freelancers, but it’s strongly advisable if you give advice or produce work clients rely on. Many clients and agencies won’t sign a contract without it, so it often becomes essential in practice.
What is the difference between public liability and professional indemnity?
Public liability covers injury to people or damage to property caused by your business. Professional indemnity covers financial loss caused by your professional advice or work. Many businesses need both.
Is professional indemnity insurance a legal requirement in the UK?
Not generally. It’s compulsory for certain regulated professions, including solicitors, ICAEW-regulated accountants, many FCA-authorised firms and HCPC-registered health professionals. Contracts can also make it a condition of working.
How much professional indemnity cover do I need?
Start with the highest limit your contracts require, then consider the largest loss a client could realistically suffer from your mistake. Many small firms choose £1 million, while higher-risk professions often need £2 million or more.
Does professional indemnity insurance cover past work?
Yes, back to your retroactive date, as long as the policy is in force when the claim is made. If you stop trading, you’ll need run-off cover to stay protected for past work.
Can I claim professional indemnity insurance as a business expense?
Generally yes. Insurance bought wholly and exclusively for your trade is normally an allowable business expense for UK tax purposes. Check your specific situation with your accountant.
What happens if I don’t tell my insurer about a complaint?
Late notification can let the insurer reduce or decline a claim. Notify potential claims as soon as you’re aware of them, even if you think the complaint will go away.
Your Next Actions
Professional indemnity insurance protects the thing your business actually sells: your expertise. Start by listing what your regulator and your top three clients require, then size your worst realistic mistake. That gives you a limit grounded in your real exposure, not a guess.
Next, check your current policy for three details: the retroactive date, whether defence costs sit inside or outside the limit, and any exclusions for services you now offer. Planning to retire, sell or close the business? Price run-off cover before you cancel anything.
If you work in construction design or on site, our construction business insurance guide covers the other policies you’ll likely need. For complex risks, regulated work or contracts with unusual liability clauses, speak to a specialist broker or a solicitor before you sign.
