Lawyers professional liability (LPL) insurance, often called legal malpractice insurance, is the specialized form of errors and omissions coverage for attorneys and law firms. It pays defense costs and damages when a client, or sometimes a third party, alleges that a lawyer's error, omission or breach of duty caused a financial loss. Legal consultants and other non-lawyer advisors need similar protection under a general professional liability policy.

Is it mandatory?

In most of the US, carrying malpractice insurance is a business decision rather than a legal requirement, but there are important exceptions:

  • Oregon. Lawyers in private practice whose principal office is in Oregon must maintain coverage with the Oregon State Bar Professional Liability Fund (PLF). For 2026 the PLF lists limits of $300,000 per claim and $300,000 for all claims against each covered party per year, plus a $75,000 expense allowance available only for defense costs.
  • Idaho. Since January 1, 2018, Idaho lawyers in private practice must carry professional liability insurance with minimum limits of $100,000 per occurrence and $300,000 annual aggregate, as reported by the Washington State Bar Association's NWSidebar (2017).
  • Disclosure rules. A number of other states require lawyers to tell the bar, or their clients, whether they are insured. Check your state bar's current rules.

Even where coverage is optional, many corporate clients, panels and referral programs require proof of insurance.

Where legal malpractice claims come from

The American Bar Association publishes a profile of legal malpractice claims every four years. In its recap of the 2020–2023 study (Swiss Re Corporate Solutions, November 2024), estate, probate and trust matters made up about 14% of all reported claims, after an increase of 1.6%, while personal injury, family law and criminal law claims declined. The same recap notes increases in missed deadlines to start proceedings, settlement negotiation errors and administrative errors, identifies conflicts of interest as one of the most frequently alleged errors, and reports that claims against firms with more than 500 attorneys increased while claims against firms with five or fewer attorneys fell.

The lesson for small firms is not that risk disappears but that the familiar failures — calendaring, conflicts and unclear engagement terms — remain the cheapest to prevent.

How LPL policies are built

  • Claims-made and reported. The claim must be made and reported during the policy period (or an extended reporting period). Keep your retroactive date when you renew or change insurers.
  • Per-claim and aggregate limits. Choose limits that reflect the size of matters you handle, not only your revenue.
  • Defense within limits. Many policies reduce the limit by defense costs; some offer separate defense limits.
  • Deductible. It may apply per claim or in aggregate, and to defense, damages or both.
  • Disciplinary proceedings. Many policies reimburse defense of bar complaints up to a sublimit.
  • Innocent insured provision. It protects partners who did not participate in another lawyer's wrongful act.

Gaps to watch

Common exclusions include intentional wrongdoing, business pursuits outside the practice of law, acting as an officer or director of a client company (a D&O issue), fee disputes and, frequently, losses from fraudulent wire instructions. Funds-transfer fraud and data breaches are better addressed through cyber insurance and crime coverage. Lawyers who retire, join another firm or close a practice should arrange an extended reporting endorsement, because claims often surface years after the work.

Risk management that insurers reward

  1. Written engagement letters that define scope, and disengagement letters when a matter ends.
  2. Two-person calendaring for limitation periods and court deadlines.
  3. Conflict checks on every new client and every new party.
  4. Written confirmation of client instructions, especially on settlements.
  5. Call-back verification before releasing any funds from a trust account.

Reporting a claim

Report any demand, malpractice suit or circumstance that could lead to a claim as soon as you learn of it. Do not try to fix the problem by waiving fees or negotiating directly with the client before speaking with the insurer, because that can jeopardize coverage.

See the professional liability category for related coverage. Policies are issued by licensed insurers and placed through licensed producers in your state. To compare options, request a quote.