What is Professional Indemnity Insurance?

    Updated: 7 March 2026

    Professional indemnity insurance (PI insurance) covers a professional or service provider for financial loss suffered by a client as a result of a negligent act, error, or omission in the delivery of professional services. Unlike public liability insurance, PI insurance focuses on pure financial loss rather than physical injury or property damage. For lawyers, accountants, architects, consultants, and IT service providers, PI cover is often legally required or contractually mandatory.

    How does professional indemnity insurance work?

    Professional indemnity insurance responds when a client claims to have suffered financial loss because a professional made an error, gave negligent advice, or failed to deliver the agreed service to the required standard. The claim does not need to involve physical harm — it is the financial consequence of the professional's failure that is covered.

    Professional groups for whom PI insurance is most relevant include: lawyers, accountants, tax advisers, financial planners, architects, engineers, IT consultants, management consultants, and surveyors. For some professions — solicitors and accountants in many jurisdictions — PI cover is a statutory licensing requirement.

    A standard PI policy covers: financial loss to the client caused by a professional error or omission, the cost of defending a claim (legal fees and investigation costs), and in some policies, the cost of reputational management. Standard exclusions include: deliberate misconduct, losses arising from knowingly breaking the law, and in many policies, claims arising from circumstances known to the insured before the policy incepted.

    A critical feature of most PI policies is the claims-made basis: the policy in force at the time the claim is made — not the time the error occurred — responds to the claim. This means cover must remain in force for as long as a claim might be brought after the completion of an engagement. Run-off cover or an extended reporting period must be negotiated when a policy is cancelled or when a firm closes.

    For buyers commissioning professional services, requiring a current PI certificate is a basic due diligence step. It confirms that if the adviser makes a costly error, there is an insurer with the financial capacity to make good the loss.

    Why does this matter for SMBs?

    A single professional error can generate a liability claim that exceeds a service firm's annual revenue. An incorrect piece of advice, a missed filing deadline, or a design flaw in an engineered system can lead to claims ranging from tens of thousands to millions. Without PI cover, the service provider bears that risk directly.

    For buyers, requiring evidence of PI insurance from professional service providers is straightforward risk management. Include it as a standard condition in contracts for legal, financial, technical, or IT advisory services.

    How to manage this correctly

    • 1Review your PI cover annually to ensure the indemnity limit reflects the scale of engagements you are undertaking
    • 2Understand whether your policy operates on a claims-made or occurrence basis — claims-made policies require continuity of cover after an engagement ends
    • 3Request a current certificate of professional indemnity insurance from any professional service provider before engagement
    • 4Include a minimum PI indemnity limit as a condition in contracts for professional and advisory services
    • 5Consider how your PI and public liability policies interact — some losses may fall under neither; others under both

    Manage all your contract deadlines automatically

    Tracking Contracts alerts you well ahead of every notice deadline — no spreadsheets, no missed renewals.

    Start free month

    Related terms