Professional liability (E&O) insurance: who needs it and how claims-made coverage works

Professional liability insurance, also called errors and omissions (E&O), covers claims that your professional advice or services were negligent, inaccurate or misrepresented and cost a client money. It pays your legal defense and any settlement or judgment up to the limit. General liability doesn't cover these claims, so consultants, accountants, IT pros, designers, real estate agents and other service businesses usually need both.

By the Fast Insurance Group editorial teamPublished by Marcus L. Barber, former licensed Maryland property and casualty producer (2010–2012)Reviewed by Marcus L. Barber on October 17, 2026Updated October 17, 2026

This guide is general education, not advice for your situation. We're an independent publisher, not an insurer or agent, and we may earn a commission from partner links. How we make money.

What professional liability covers

The National Association of Insurance Commissioners (NAIC) defines errors and omissions insurance as covering errors in judgment, breaches of duty, and negligent or wrongful acts in business conduct. The Insurance Information Institute (III) says it covers claims general liability typically doesn't, including:

• Negligence in performing your services
• Misrepresentation
• Inaccurate advice

It pays for your legal defense and any judgment or settlement up to the policy limit. Intentional or dishonest acts are generally excluded. Professional liability isn't part of a business owner's policy; you buy it separately or as an endorsement to a commercial package policy.

Professional vs. general liability

Many service businesses need both. See general liability insurance.

Claims-made coverage and tail

The III says most professional liability policies are claims-made: the policy must be in effect both when the event happened and when the claim is filed. That's different from an occurrence policy, which covers anything that happened during the policy period no matter when the claim arrives.

Three terms matter on a claims-made policy:

• Retroactive date. The policy only covers work done after this date. When you renew or switch insurers, try to keep your original retroactive date so there's no gap.
• Reporting. Claims must be reported during the policy period or an extended reporting period.
• Tail coverage (extended reporting period). Lets you report claims after the policy ends, for work done while it was active. In its malpractice guide, the III suggests buying tail coverage when you change policies, take a new position or retire.

Who needs it

The III lists professions that commonly carry professional liability, including:

• Accountants and investment advisors
• Architects and engineers
• IT consultants and software developers
• Graphic designers
• Management consultants
• Insurance professionals
• Real estate agents

Doctors and lawyers carry malpractice coverage, a form of professional liability. Clients, especially larger companies, often require E&O in their contracts before you start work.

Where it's required

Most professions aren't required by law to carry E&O, but some licenses are. The III notes some states require it especially for attorneys and doctors. Two real estate examples:

• Colorado requires every active real estate licensee to carry errors and omissions insurance, and notes that licensees leaving a group plan may need tail coverage.
• Iowa law requires real estate licensees to carry E&O covering their licensed activities, with the commission contracting for a group policy.

Check your licensing board's rules and your client contracts.

What to check before you buy

1. Limits that match your contracts and the size of the work you do.
2. Whether defense costs reduce your limit. On some policies, legal fees come out of the same limit that pays claims, so a long defense leaves less to pay a settlement. Ask how yours works.
3. Retroactive date, especially if you're switching insurers.
4. Tail options and their price.
5. Exclusions specific to your profession.

For pricing context, see what small business insurance costs.