Professional Indemnity Insurance Calculator

Complete Guide to Professional Indemnity Insurance UK 2026

What is Professional Indemnity Insurance?

Professional indemnity (PI) insurance protects professionals and businesses against claims of negligence, errors, or omissions arising from the professional services they provide. If a client alleges that your advice, designs, reports, software, or services caused them financial loss — whether through a genuine mistake, misunderstanding, or even a false accusation — PI insurance covers the legal costs of defending the claim and any compensation or damages awarded against you.

Without PI insurance, a single professional negligence claim could financially destroy an otherwise successful practice. Legal defence costs alone can easily reach £50,000–£200,000 for a contested case, even if you ultimately win. Compensation awards and settlements vary enormously but can reach millions of pounds in high-value professional services (surveying valuations, financial advice, legal work, engineering design failures).

PI insurance is distinct from public liability insurance (which covers physical injury or property damage) and employers' liability insurance (which covers employee injury claims). For most professional services businesses, PI is the most important and relevant cover.

Claims Made vs Occurrence Basis

Understanding the trigger basis of PI insurance is essential. In the UK, virtually all PI policies are written on a claims made basis. This means the policy responds to claims that are notified (reported) to the insurer during the period of insurance — not when the negligent act occurred. A piece of work done in 2020 that gives rise to a claim notified in 2026 would be covered by your 2026 PI policy, not your 2020 policy.

The critical implication is continuity of cover. Gaps in your PI coverage — even a single day without a policy — leave you exposed to claims for all past work up to that gap. This is why maintaining continuous cover is essential, and why run-off cover is absolutely necessary when you cease practice.

Most policies also require you to notify the insurer of any circumstances that might give rise to a claim, even before a formal claim is made. Failure to notify can void cover. Report anything that even might lead to a claim as soon as you become aware of it — do not wait for the client to formally allege negligence.

Run-Off Cover: Essential When Ceasing Practice

Run-off cover (also called a tail policy) provides protection after you close your practice, retire, or cease providing professional services. Because your PI policy is claims made, cancelling it means you would be entirely unprotected against future claims from past work — even work done years before and considered completely satisfactory at the time.

The standard limitation period for professional negligence claims in contract is 6 years (Limitation Act 1980); in tort it can be 3 years from when you knew or ought to have known of the loss, subject to a 15-year long-stop. For construction professionals, a 6-year period from completion applies for ordinary negligence; 12 years for claims under deed. This means run-off cover should typically be maintained for at least 6 years after ceasing practice.

Run-off premiums are typically 150–250% of your final year's premium for a 6-year tail. For a consultant paying £700/year, a 6-year run-off might cost £1,050–£1,750. Some insurers offer permanent run-off options. Budget for run-off costs as part of your exit planning.

Regulatory Requirements by Profession

Several professions have mandatory PI requirements enforced by their regulatory bodies:

• Solicitors (SRA): Minimum PI cover of £2 million for a single claim, arranged through a qualifying insurer in the SRA's panel. This applies to all SRA-authorised firms. Solicitors who operate through alternative business structures (ABSs) have different requirements.
• FCA-regulated firms (IFAs, mortgage brokers, insurance intermediaries): Mandatory PI cover meeting FCA minimum standards under IPRU(INS), with indemnity levels scaled to the firm's business volume. FCA-authorised firms are required to maintain cover that responds to professional liability claims, with minimum indemnity per claim of €1.25 million (approximately £1.05 million) for investment advice firms.
• Architects (ARB): All architects practising in the UK must hold PI as a condition of ARB registration, with minimum cover of £250,000 per claim. RIBA recommends higher levels based on project values.
• Chartered Surveyors (RICS): RICS requires all regulated firms to hold PI meeting the RICS minimum terms and conditions, with minimum indemnity of £250,000 per claim for residential work and higher for commercial.
• Accountants (ICAEW, ACCA, CIMA): Holders of a practising certificate from ICAEW, ACCA, or other bodies must hold PI as a condition of the certificate and membership.
• Barristers: The Bar Standards Board requires all self-employed barristers to hold PI through the Bar Mutual Indemnity Fund (BMIF).

Contractor PI Requirements

IT contractors, management consultants, and other freelancers are typically not legally required to hold PI insurance — but in practice, most clients contractually require it. Public sector clients, large corporations, and clients in regulated industries routinely require PI cover of £1 million or £2 million as a condition of engagement. Some client contracts specify that the contractor must maintain cover for a certain period after project completion (typically 6 years), which effectively creates a run-off requirement.

For IR35 purposes, holding personal PI insurance — rather than relying on the end client's employer indemnity — is one factor (among many) that may indicate genuine self-employment. While no single factor is determinative under IR35, having professional indemnity insurance in your own name is consistent with operating as an independent business rather than a disguised employee.

Retroactive Date: A Critical Policy Term

The retroactive date (or retroactive cover date) is the date from which your PI policy provides cover for past work. If your policy has a retroactive date of 1 January 2023, it will only cover claims arising from work done on or after that date, regardless of when the claim is made. Work done before the retroactive date is uninsured.

When you first take out PI insurance, the retroactive date is typically the inception date — meaning you only have cover from day one of the policy for future work. Each year you renew, the retroactive date should remain fixed at the original inception date (providing full retrospective cover), while your coverage extends forward. If you switch insurers, ensure the new insurer agrees to honour the same retroactive date — otherwise, you have a gap in cover for historical work.

Policies with a retroactive date going back to your business's founding date (a "full retroactive cover" or "nil retroactive date") provide the broadest protection. Always check and negotiate this when renewing or switching.

Policy Excess and How to Choose It

The excess (deductible) on a PI policy is the amount you must pay towards each claim before the insurer meets the remainder. Standard excess levels range from £500 to £5,000 for small professional practices; higher for larger firms. A higher excess reduces your premium but increases your out-of-pocket exposure on claims. For an IT contractor with a £400/year premium, increasing the excess from £500 to £2,500 might save £50–£80/year — a modest saving. The key question is: can you comfortably afford the excess on a claim? If not, choose a lower excess. Also consider that excess may apply to both damages and defence costs, or to damages only — check carefully.

Top Tips for Getting the Best PI Insurance Quote

• Use a specialist broker: Generalist comparison sites often cannot access specialist PI markets. A broker specialising in your profession will know which insurers are most competitive and can negotiate better terms.
• Describe your work accurately: Underwriters price based on the actual activities you undertake. Vague or inaccurate descriptions lead to potential coverage disputes. Be specific about the type of advice, the sectors you work in, and the typical project values.
• Provide complete claims information: Disclose all past claims, circumstances, and notices accurately. Non-disclosure can void cover at the point of claim.
• Consider an aggregate limit: Some policies offer a limit "per claim" (each claim is subject to the full limit) while others offer an "aggregate" limit (the total paid across all claims in a year). Per claim is generally better value for small practices.
• Shop the market annually: PI market conditions change. An insurer who was cheapest last year may not be competitive this year. Compare at renewal — switching mid-term can have implications for retroactive cover.
• Major UK PI insurers: Hiscox, Zurich, AXA, Markel, QBE, Allianz, and specialist MGA providers access Lloyd's of London markets. Online brokers include Simply Business, PolicyBee, and i-Wonder.

Sources & Methodology

Premium estimates in this calculator are based on typical market rates observed from public quotes and industry data. They are indicative only and vary significantly by risk.

• FCA — Professional Indemnity Insurance Requirements
• SRA — Minimum Terms and Conditions for PI
• ARB — Architects PI Requirements
• RICS — PI Insurance Guidance