What affects your professional indemnity premium? The main cost drivers

Reviewed by Matthew Bartlett, Director, Apex Insurance Brokers Limited · Last reviewed 2026-08-05

No two professional indemnity (PI) premiums are set the same way. Insurers price the specific risk they think they are taking on, and a handful of factors do most of the heavy lifting. Understanding them helps you see why a quote looks the way it does — and where a broker can genuinely influence it. Below we walk through the full driver list, without quoting figures that would be meaningless for your situation.

The main cost drivers, at a glance

These are the factors insurers weigh most heavily when they rate a professional indemnity risk. Not all carry equal weight, and the balance shifts by profession.

Your profession and the work you actually do

The single biggest lever is what you do for a living. An insurer's rating starts from the claims experience of your profession as a whole — architects, solicitors, accountants, IT consultants, surveyors, financial advisers and management consultants all sit on different risk footings. Some fields simply generate larger or more frequent negligence claims.

Within your profession, the detail matters too. Advising on high-value projects, safety-critical work, or work with a long "tail" (where a mistake might surface years later) tends to push the price up. Whether you design, advise, certify or merely implement someone else's specification all changes your exposure. A broker who understands your discipline can present these nuances accurately rather than letting you be rated on a blunt, worst-case assumption.

Turnover, fee income and the size of your exposure

Insurers use your annual turnover — or professional fee income — as a shorthand for how much work you take on and therefore how much can go wrong. More projects, more clients and larger contract values generally mean more premium. The split of your income matters as well: work for large corporates, the public sector, or overseas clients (particularly in North America) is often rated differently from work for individuals and small businesses.

Because turnover drives the price, keeping your declared figures current and accurate is important. Over-declaring inflates your premium; under-declaring can prejudice a claim.

The limit of indemnity you choose

Your limit of indemnity is the maximum the policy will pay. A higher limit gives more protection but costs more, because the insurer is exposed to larger potential payouts. Common options are structured around generic levels such as £1m, £2m or £5m, though the right figure depends on your contracts and clients — not on picking the cheapest.

Two structural points also affect cost. First, whether the limit applies to each and every claim or on an aggregate (total for the year) basis. Second, whether defence costs sit inside the limit or in addition to it. Many professional bodies and client contracts set a minimum limit you must carry, so your choice is not always entirely free.

Claims history and disclosed circumstances

Your past record is a strong predictor for insurers. Previous claims, and even circumstances that might lead to a claim, will influence your terms — how many, how recent, how severe, and whether they suggest a pattern. A clean history is a genuine asset at renewal.

Non-disclosure is where things go wrong. Under the Insurance Act 2015, commercial clients have a duty to make a fair presentation of the risk, which means disclosing known claims and circumstances honestly. Getting this right protects both your premium and your ability to claim later.

Excess, retroactive date and policy structure

Beyond the headline factors, several structural choices shape the price:

• Excess. The amount you pay towards each claim. Accepting a higher excess usually reduces the premium, because you are sharing more of the risk.
• Retroactive date. PI is written on a claims-made basis, so cover responds to claims made during the policy period, provided the work dates back to your retroactive date. Full retroactive cover (no date limit) costs more but protects your historic work.
• Continuity of cover. Gaps in your PI history worry insurers, because the claims-made structure can leave past work uninsured. An unbroken record generally helps your terms.
• Extensions. Add-ons such as loss of documents, dishonesty of employees, or wider civil liability broaden the wording and can affect the price.

The things you can control

Some drivers are fixed — your profession, your claims history — but others respond to good management. Robust contracts with clear scope and reasonable liability caps, quality-control procedures, documented advice, staff training and careful client selection all present a lower risk. Insurers reward evidence of good practice, and a broker can make sure that evidence reaches the underwriter rather than being lost in a generic proposal form. That advocacy — matching your risk to the right insurer and wording — is often where the real difference in cost and cover is made.

Common questions

Does a higher excess always lower my premium?

Usually, yes — taking on more of each claim reduces the insurer's exposure. But the saving must be weighed against the amount you would have to fund yourself if a claim arose. A broker can compare structures so the trade-off makes sense for your cash flow.

Why did my premium rise even though I had no claims?

Pricing reflects the wider market as well as your own record. Rising turnover, changes in your profession's claims experience, or broader shifts in insurer appetite can all move the price. Reviewing your presentation at renewal, ideally through a broker, helps keep it fair.

Can I reduce my premium by lowering my cover?

Cutting the limit of indemnity will usually reduce the premium, but it may leave you underinsured or breach a client contract or professional body requirement. It is better to right-size cover to your actual exposure than to buy on price alone. Speak to us for a tailored assessment.

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.