Professional liability insurance, also called errors and omissions (E&O), pays to defend you and pay damages when a client says your advice, design or service was negligent and cost them money. Most of these policies are written on a claims-made basis. That means the policy in force when the claim is made, not the one in force when you did the work, is the one that responds.
That single feature drives most of the decisions you make about E&O: when to buy it, what retroactive date to protect, and what to do when you switch insurers or retire.
What professional liability insurance covers
The Insurance Information Institute describes professional liability insurance as coverage for defense costs and damages arising from negligent advice, expertise or services (Triple-I, Liability Insurance). The National Association of Insurance Commissioners describes it as coverage for wrongful practices by professional service providers, giving healthcare providers, lawyers and consultants as examples, and lists failure to provide appropriate advice as a typical error it addresses (NAIC, Small Business Insurance). The U.S. Small Business Administration summarises it as protection against financial loss from malpractice, errors and negligence (SBA, Get business insurance).
Typical claims look like this:
- A bookkeeper misses a filing deadline and the client is assessed penalties.
- A web developer’s code fails at launch and the client loses sales.
- A consultant’s recommendation is followed and the project loses money.
- An engineer’s specification is wrong and a client has to redo work.
- A marketing agency is accused of missing contracted deliverables.
The common thread is financial harm from the quality of your professional work. Physical injury and property damage are usually the job of general liability.
Why general liability and a BOP leave this gap
The NAIC lists professional errors and omissions among the standard exclusions of commercial general liability. It also states that a business owner’s policy generally excludes professional liability, so a professional who needs that protection has to buy it separately. Triple-I lists professional services among the CGL exclusions as well.
The reason is underwriting. A CGL rate is built around slips, falls and damaged property. The cost of a professional mistake depends on the profession, the size of the clients and the contracts signed, so it is priced on its own. See our guide to the business owner’s policy for what the package does include.
Claims-made: the rule that decides coverage
The Texas Department of Insurance explains the two policy triggers. An occurrence policy covers claims arising from events while the policy is in force, even if the claim comes later. A claims-made policy covers claims made during the policy term, and TDI warns that a claim may not be covered unless it is both made and reported within the policy period (TDI, Commercial general liability insurance; TDI, Medical liability insurance shopping guide).
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The retroactive date
Most claims-made policies also carry a retroactive date. TDI notes that it usually appears on the declarations page and that the policy covers work performed after it. Prior acts coverage, sometimes called “nose” coverage, sets an earlier retroactive date. TDI also notes that claims you already knew about before the policy began are not covered.
Protect your retroactive date. If you renew with the same insurer, it should stay fixed at the date you first bought coverage. If a new insurer offers a policy with a retroactive date equal to its start date, all your past work is uninsured on that policy.
The reporting window and tail coverage
TDI explains that a typical claims-made policy provides a short reporting period of 30 or 60 days after expiration to report claims that arose too late to report before the policy ended. After that window, run-off or “tail” coverage, formally an extended reporting period, can be bought for an additional premium. TDI notes extended reporting periods may run for one, three or five years, or be unlimited.
For medical professionals, TDI’s shopping guide says tail coverage may cost as much as one and a half to three times an annual premium, and advises that when you change insurers you either buy tail from the old one or prior acts coverage from the new one. No reliable published figure exists for tail pricing across other professions; ask for the tail price in writing when you buy, not when you leave.
Timeline example
| Date | Event | Which policy responds? |
|---|---|---|
| 2023 | You buy E&O; retroactive date set to 2023 | Policy A starts |
| 2024 | You complete a project with an undiscovered error | Work is after the retroactive date |
| 2025 | You switch insurers; new policy keeps the 2023 retro date | Policy B now covers 2023-onward work |
| 2026 | Client sues over the 2024 project | Policy B, if the claim is reported during its term |
| Alternative | Policy B set its retro date to 2025 | No coverage for the 2024 project unless you bought tail on Policy A |
Who usually needs E&O
Any business that is paid for advice, design, analysis or a professional service has the exposure. Some professions have licensing or contract requirements; others simply face clients who can afford to sue. The NAIC’s article on home-based work notes that some professionals are required to carry professional liability or E&O insurance, a point covered in our guide to home-based business insurance (NAIC, Working from Home and Your Insurance Coverage). Whether you are required to depends on your profession’s licensing board and your client contracts, so check both.
Common buyers include consultants, accountants and bookkeepers, IT and software firms, marketing agencies, architects and engineers, real estate professionals, insurance agents and healthcare providers. Medical malpractice is the healthcare form of professional liability, and TDI publishes a separate shopping guide for it.
Policy features to check
- Trigger. Claims-made, or claims-made-and-reported?
- Retroactive date. Does it cover all your past work?
- Defense inside or outside limits. If defense costs erode the limit, a long lawsuit leaves less for any settlement.
- Definition of professional services. It must describe what you actually do. Work outside the definition is not covered.
- Consent to settle. Some policies let the insurer settle without your agreement; others limit what it pays if you refuse a settlement it recommends.
- Exclusions. Common ones include intentional acts, bodily injury, contractual guarantees and fines.
- Extended reporting options. Lengths offered, price and how long you have to elect them.
When you close, retire or sell
Because claims can arrive years after the work, ending your E&O policy when you stop working can leave every past client uncovered. This is when the extended reporting period matters most. Note the deadline to elect it: as one example of a state rule, TDI’s form-filing checklist for claims-made personal liability coverage in Texas requires that the insured be given at least 30 days to purchase the extended reporting endorsement (TDI, Review requirements checklist). Other states set their own rules, and policies may give more time.
Put the policy’s extended reporting election deadline in your calendar the day the policy arrives; it is the one date on an E&O policy that cannot be fixed after it passes.
Sources
- National Association of Insurance Commissioners: Small Business Insurance
- NAIC: Working from Home and Your Insurance Coverage
- Insurance Information Institute: Liability Insurance (Small Business Owner’s Guide)
- Texas Department of Insurance: Commercial general liability insurance
- Texas Department of Insurance: Medical liability insurance shopping guide
- Texas Department of Insurance: Review requirements checklist
- U.S. Small Business Administration: Get business insurance