Professional Indemnity Insurance Calculator
Professional indemnity (E&O) insurance coverage should match the financial exposure your profession creates. The recommended minimum is based on your largest single contract or project value (the most you could lose on one engagement), your annual revenue (to cover aggregate exposure), and any contractually required limits specified by your clients. This calculator combines these factors and compares them against contractual requirements to determine your recommended policy limit.
Professional indemnity coverage sizing formula
Revenue Need = Annual Revenue x Revenue Multiple x Risk Level Factor
Contract Need = Largest Contract x 2 (to cover defense costs)
Recommended Limit = max(Revenue Need, Contract Need, Contractual Minimum)
Est. Premium = Recommended Limit x 0.75% (midpoint of 0.5% to 1.0% typical range)
The 2x multiplier on contract value accounts for legal defense costs, which often equal or exceed the claim settlement itself. Many E&O policies are "defense outside limits," meaning defense costs erode the policy limit.
Common professional indemnity limits by profession
- IT consultants and developers: $1 million to $2 million is standard. Technology contracts frequently specify $1 million minimum.
- Accountants and CPAs: $1 million to $5 million. State CPA societies often recommend at least $1 million.
- Engineers and architects: $1 million to $10 million, depending on project size and jurisdiction requirements.
- Healthcare professionals: $1 million per occurrence / $3 million aggregate is common; higher in high-risk specialties.
- Management consultants: $1 million to $2 million. Many Fortune 500 clients require $5 million or more.
Frequently asked questions
What is professional indemnity insurance?
Professional indemnity insurance (also called errors and omissions, E&O, or professional liability insurance) covers claims arising from professional mistakes, negligent advice, errors, or omissions that cause financial harm to a client. It covers legal defense costs and settlements or judgments up to the policy limit. It is a claims-made policy, meaning it covers claims made while the policy is in force, regardless of when the alleged error occurred.
Who needs professional indemnity insurance?
Any professional who provides advice, services, or designs to clients for a fee should carry professional indemnity insurance. This includes consultants, accountants, architects, engineers, IT professionals, real estate agents, financial advisors, lawyers, and healthcare professionals. Many professional licensing bodies and client contracts require it as a condition of doing business.
How much professional indemnity coverage do I need?
Coverage should be sufficient to handle your largest single contract value or project scope, plus defense costs. Industry guidance suggests a minimum of 100 to 200 percent of annual revenue for most professionals, with higher limits for those in high-risk fields (medical, legal, engineering). Many contracts specify a required minimum limit, typically $1 million to $5 million.
What is the difference between claims-made and occurrence professional indemnity policies?
A claims-made policy covers claims first made during the policy period, regardless of when the error occurred (subject to a retroactive date). An occurrence policy covers errors that occurred during the policy period, regardless of when the claim is filed. Professional indemnity is almost always written on a claims-made basis. Tail coverage (extended reporting period) is available to cover claims after policy cancellation.
What is the retroactive date on a claims-made policy?
The retroactive date is the date before which a claims-made policy will not cover losses, even if the claim is made during the policy period. The earlier the retroactive date, the broader the coverage. For a new business, the retroactive date is typically the policy inception date. Maintaining continuous coverage preserves the retroactive date and covers past work indefinitely.
Official sources
- NAIC: Professional Liability Insurance Consumer Guide.
- SBA: SBA Business Insurance Guide.
- Insurance Information Institute: What Is Professional Liability Insurance?
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.