Professional Liability Insurance for Consultants

Consultants need professional liability insurance, also called errors and omissions (E&O), because their main risk is a client claiming their advice or work caused a financial loss, which general liability excludes. Many client and government contracts require it, commonly $1 million to $2 million per claim, and some require coverage to stay in place for years after the engagement ends.

By Trella Commercial · Updated October 23, 2026

The short version

Your advice is your product. If a recommendation, analysis, or deliverable leads to a client loss, the claim is professional liability, not general liability.
Contracts usually decide the limit. State contracts we reviewed require $1 million to $2 million per claim; many private master services agreements are similar.
Coverage has to outlast the engagement. E&O is usually claims-made, and some contracts require you to keep it, or buy a tail, for two to five years after the work ends.
Solo consultants need it too. A client's loss can be just as large when the consultant is a one-person firm. Going independent? Many client contracts ask for E&O.

Claims consultants face

Situation	Why it becomes a claim
A recommended system, vendor, or strategy fails	The client says your advice caused the losses that followed
A project runs late or over budget	The client says you missed deadlines or managed it poorly
An analysis or report contains an error	The client made a decision based on wrong numbers
Scope creep and unclear deliverables	The client says you did not deliver what was promised
A regulatory or compliance recommendation misses something	The client faces penalties or rework
AI-assisted work contains a mistake	The client relied on it; see when your AI gives a wrong answer

Consulting claims have been rising even at CPA firms. In the AICPA's professional liability program, consulting services claims were 9% of 2021 claims, up 50% from 2020. Even a claim you would win costs money to defend, and E&O pays the defense.

What consultant E&O covers and does not

Usually covered	Usually not covered
Negligent advice, errors, and omissions in your consulting services	Bodily injury and property damage at a client site (general liability)
Defense costs, settlements, and judgments	Data breaches involving client data (cyber)
Claims arising from work done after your retroactive date	Guarantees of results or fees you promised beyond normal care
Often: your liability for work by subcontractors you hire	Intentional wrongdoing

What contracts require of consultants

Contract	Requirement
Washington statewide IT project management contract (14822)	Technology E&O of $2,000,000 per occurrence and $4,000,000 aggregate when the agency requires it; claims-made coverage kept for three years after the contract
Idaho Department of Education solicitation template	Professional liability of $1,000,000 per occurrence and $2,000,000 aggregate, with a 24-month tail or a qualifying retroactive date
Washington state contracts generally	DES guidance lists consultants among the professions agencies should consider for professional liability requirements

The Washington and Idaho state contracts we reviewed leave professional liability out of their additional insured requirements. Private contracts sometimes ask anyway, and many E&O policies cannot add a client as an insured. Paste a contract into our contract insurance checker to see exactly what it requires.

How much coverage to carry

Start with the contract. Carry at least the highest limit any active client contract requires.
Size it to the projects. The value of the decisions your work influences matters more than your fee.
Check defense terms. If defense costs are inside the limit, a long dispute can use up the coverage. Idaho Department of Education solicitation terms, for example, double the general liability limit when defense is inside the limits.
Plan the tail. In Washington, professional negligence claims generally have three years from when the client discovers the problem, so claims can arrive long after a project. Idaho gives licensed professionals' clients two years from the act once damage is ascertainable. Claims for breach of a written contract can run longer: six years in Washington (RCW 4.16.040) and five in Idaho (Idaho Code 5-216).

What else consultants usually need

Coverage	Why
General liability	Client sites and offices often require it, for injury and property damage
Cyber	Client data on your laptop or systems
Business owners policy	Office equipment and general liability in one package
Washington stop-gap	If you have Washington employees and a contract asks for employers liability; see stop-gap insurance

For firms that use AI in client work, see the AI liability guide.

Common questions

Do consultants need professional liability insurance?

Most do. Consultants are paid for advice and expertise, and the main claim against them is that their work caused a client a financial loss, which general liability does not cover. Many client contracts also make it a requirement.

How much E&O coverage does a consultant need?

At least the highest limit any client contract requires. State contracts we reviewed ask for $1 million to $2 million per claim, and some larger technology contracts ask for $2 million per occurrence and $4 million aggregate.

Is professional liability insurance required for consultants in Washington?

Not by state law for consultants in general. It is commonly required by client contracts, including state agency contracts.

Does consultant E&O cover past projects?

Only back to the policy's retroactive date. Keep the same retroactive date when you renew or change insurers, so earlier projects stay covered.

What happens to my coverage if I stop consulting?

A claims-made policy stops covering new claims when it ends. An extended reporting period (tail) lets you report claims after the policy ends for work done before it ended and after the retroactive date. Some contracts require two to five years.

Sources

This guide is general information. Coverage depends on the policies actually issued. Reviewed October 2026.

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