Public Liability vs Professional Indemnity Insurance: Which One Does Your Business Actually Need?

Two policies, names that sound like variations on a theme, and a lot of business owners quietly hoping they only have to buy one. Public liability and professional indemnity protect against entirely different kinds of trouble, and choosing wrong is the sort of mistake you discover in the middle of a claim, when it is far too late to fix.

Here is the difference in plain language, the test that actually works, and the one structural difference between the two that almost nobody explains until it costs someone their business.

The one-line version, and why it is not quite enough

Every insurer gives you the same summary: public liability covers physical harm, professional indemnity covers financial harm. That is a good starting point and it is where most explanations stop.

It is also where people go wrong, because the version they remember is usually “public liability is for the public, professional indemnity is for clients”. That is not right. Your client is also a member of the public. If a client trips over a cable in your studio and breaks a shoulder, that is a public liability claim, even though they are a client and even though they are standing in your office because of professional work.

The test that holds up is not who was harmed. It is what went wrong:

• A body or an object got damaged → public liability
• A decision, a deliverable or a piece of advice cost someone money → professional indemnity

Run any scenario through that and it sorts itself.

What public liability actually handles

Public liability responds to injury, illness or property damage suffered by a third party because of your business. “Third party” is broad — customers, clients, suppliers, delivery drivers, passers-by. It picks up the compensation, the medical costs, and the legal defence bill.

The examples insurers themselves use are deliberately mundane, because that is how these claims arrive:

• A supplier slips on a freshly cleaned restaurant floor
• A visitor trips over an office cable, breaking a shoulder and damaging a watch
• A customer slips on a wet floor and breaks an arm
• Coffee goes over a client’s laptop during a meeting at their premises

If your work puts you in other people’s spaces, or puts other people in yours, this is the cover that catches the ordinary accidents.

What professional indemnity actually handles

Professional indemnity responds when a client says your work caused them a financial loss. Nobody needs to be hurt. Nothing needs to be broken. The claim is about the quality of what you delivered.

It typically reaches further than people expect — beyond straightforward negligence it usually covers unintentional breach of confidentiality, unintentional copyright infringement, defamation and libel, and loss of client data or documents.

Again, the real examples are undramatic:

• Confidential client information forwarded to the wrong recipient
• A design agency printing the wrong contact details in a client’s advertisement
• An accountant’s error that hits a client’s finances
• An architect’s mistake in building plans leading to structural failure

If people pay you for judgement, expertise or a deliverable, this is the policy standing between one unhappy client and a legal bill you fund yourself.

The difference nobody explains: claims-made vs occurrence

This is the part worth reading twice, because it is the single most consequential difference between the two policies and it rarely appears in the comparisons.

Professional indemnity is normally written on a claims-made basis. It responds only if the policy is live on the day the claim is made against you — not the day you did the work. Public liability is normally occurrence-based: it responds to something that happened while the policy was live, whenever the claim eventually turns up.

The practical consequence is severe and specific to professional indemnity. Stop trading, cancel the policy, and every piece of work in your entire history becomes uninsured, because there is no live policy left to make a claim against. The work was covered when you did it. It is not covered now.

The fix is run-off cover — you keep a policy running after you stop trading, purely to answer claims about past work. This is not a niche concern invented by insurers. It is exactly why the Solicitors Regulation Authority obliges solicitors to carry run-off for a further six years after ceasing practice, at the same minimum level as their live policy.

If you sell professional services and you ever plan to retire, wind up, or move into employment, put run-off on your list now rather than finding out about it on the way out.

If you are regulated, you do not get a choice

Neither policy is required by UK law. The only business insurance that is legally compulsory is employers’ liability, once you take on staff.

But “not required by law” and “optional” are different things. For a number of professions, a regulator makes professional indemnity effectively compulsory and sets the minimum:

• Solicitors — the SRA requires qualifying insurance with a minimum sum insured of £3 million for relevant recognised and licensed bodies, and £2 million for other authorised bodies. Responsibility sits with the firm and its principals, and cover must be “adequate and appropriate” for current and past practice.
• Accountants — compulsory for ICAEW members holding a practising certificate in public practice. The limit is set by the institute, so check it with them rather than with an insurer.
• Architects, financial advisers and several healthcare roles — same pattern: the regulator, not the law, makes it mandatory.

And regardless of regulation, plenty of contracts settle the question for you. Many client contracts, local authority work in particular, stipulate both covers as a condition of the engagement.

How much cover, and what it costs

The two policies are sold at quite different scales, which tells you something about the claims they expect:

• Professional indemnity — typically £50,000 to £5 million
• Public liability — typically £1 million to £10 million

On price, professional indemnity starts around £6.90 a month for £1m of cover — though, as ever, that is the cheapest 10% of customers, so treat it as a floor rather than a forecast. Two real quotes give a better feel: a self-employed software developer at £11.08 a month (£96.76 a year), and a freelance photographer at £21.00 a month (£183.42 a year). Public liability averages about £78.75 a year.

So a freelancer carrying both is realistically looking at somewhere around £160 to £190 a year. Set that against an average claim of £3,377 and the “which one can I get away with?” question rather answers itself. You can usually buy the pair inside a single combined policy, which is both cheaper and simpler than running two.

So which do you need?

Work through it in this order:

Do you employ anyone? Then employers’ liability first — that one is the law, minimum £5 million, and the fines for going without are daily.

Does anyone ever come into physical contact with your business? Clients at your premises, you at theirs, deliveries, site visits, public events. If yes, public liability.

Do people pay you for advice, design, analysis or a deliverable? If yes, professional indemnity — and check whether a regulator or a contract sets your minimum before you pick a limit.

Are you regulated, or do you work on contracts that specify cover? Then the answer is already written down somewhere. Go and read it rather than guessing.

For a great many one-person businesses the honest answer is both, because most businesses carry both kinds of risk without noticing. A consultant who also meets clients face to face sits squarely in the overlap: the advice is a professional indemnity risk, the meeting is a public liability one, and they are not substitutes for each other.

The two policies are not competitors. They are two halves of the same protection, and the gap between them is exactly where uninsured claims land.

To see where these two sit alongside everything else a business might carry, our guide to what a small business actually needs to insure lays out the full short list. If price is the deciding factor, we have broken down what the cheapest cover really costs a sole trader, and if you work for yourself without staff, public liability for freelancers covers the contract-driven side of the decision.

Frequently asked questions

What is the difference between public liability and professional indemnity insurance?

Public liability covers injury, illness or property damage suffered by a third party because of your business. Professional indemnity covers a client’s financial loss caused by a mistake in your professional work. The reliable test is what went wrong: a body or object was damaged (public liability), or advice and deliverables cost someone money (professional indemnity).

Is either one a legal requirement in the UK?

No. Employers’ liability is the only business insurance required by UK law, and only once you employ someone. However, professional indemnity is effectively compulsory for regulated professions such as solicitors, accountants, architects and financial advisers, and many contracts require both.

How much professional indemnity cover do solicitors need?

The SRA sets a minimum sum insured of £3 million for relevant recognised and licensed bodies and £2 million for other authorised bodies, and requires run-off cover for a further six years after a firm ceases practice.

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

Professional indemnity is usually claims-made, so it only responds while the policy is live. Run-off keeps a policy running after you stop trading so that claims about past work are still covered. Anyone selling professional services who plans to stop trading should budget for it.

Can I buy both policies together?

Yes. Most insurers will write public liability and professional indemnity into a single combined business policy, which is generally cheaper and easier to manage than two separate ones.

How much do both cost together?

Professional indemnity starts around £6.90 a month for £1m of cover, with real freelancer quotes in the £97 to £183 a year range. Public liability averages about £78.75 a year. Carrying both typically lands somewhere around £160 to £190 a year for a one-person business.

Figures reflect UK market data published between January and July 2026 and are general information, not financial or legal advice. Regulatory minimums change — confirm your obligations with your regulator, professional body and client contracts before buying.