Professional services businesses rely on knowledge, expertise, advice, and specialized skills. But even an experienced professional can make an error, overlook an important detail, or face a client who believes a service caused financial harm.

That is where professional liability insurance can become important.

Professional liability insurance, also known as errors and omissions (E&O) insurance, is designed to help address certain claims arising from professional services. It is commonly considered by consultants, accountants, technology professionals, designers, marketing agencies, financial professionals, and other service-based businesses.

But what does professional liability insurance actually cover?

The answer depends on the specific policy. Professional liability policies contain different definitions, exclusions, limits, and conditions. However, they generally focus on certain claims alleging that professional services resulted in a client’s financial loss.

This guide explains what professional liability insurance may cover, what it generally does not cover, examples of potential claims, and how it compares with other business insurance in the United States.

What Is Professional Liability Insurance?

Professional liability insurance is business insurance designed to address certain claims alleging errors, omissions, negligence, or other covered problems related to professional services.

It is commonly called E&O insurance because it may respond to allegations that a professional made an error or failed to do something that should have been done.

For example, a consultant may provide a recommendation that a client claims resulted in financial losses.

An accountant could be accused of making an error in professional work.

An IT consultant might face a claim alleging that a technical recommendation caused business disruption.

If the claim falls within the policy, professional liability insurance may provide a defense and potentially pay covered settlements or judgments, subject to the policy terms and limits.

What Does Professional Liability Insurance Cover?

While coverage varies, professional liability insurance may address several common categories of claims.

1. Professional Errors

One of the primary purposes of E&O insurance is to address certain allegations involving professional errors.

Imagine an accountant prepares a client’s financial report and accidentally enters an incorrect figure.

The client later claims that the error resulted in financial losses.

If the claim meets the policy’s requirements, professional liability insurance may help respond to the allegation.

Errors can occur in many professional fields.

Examples include:

• Incorrect calculations
• Data-entry mistakes
• Incorrect recommendations
• Design errors
• Missed details
• Technical mistakes
• Documentation errors

The policy determines whether a particular error is covered.

2. Professional Omissions

An omission occurs when something important is allegedly left out.

For example, a consultant creates a business plan but fails to include an important risk consideration.

The client claims that the omission contributed to financial losses.

Professional liability insurance may potentially address a covered claim.

This is particularly relevant for professionals whose clients depend on detailed reports, analysis, recommendations, or documentation.

3. Professional Negligence

A client may allege that a professional failed to provide services with the expected level of care.

This type of allegation can arise in many industries.

For example, a technology consultant could be accused of failing to properly assess a client’s technology environment before recommending a solution.

A marketing consultant could be accused of failing to perform agreed professional services competently.

If the claim is covered, the E&O policy may respond in accordance with its terms.

4. Failure to Provide Professional Services

Some professional liability policies may cover certain allegations that professional services were not properly performed.

For example, a consultant agrees to deliver a detailed analysis but allegedly fails to provide important components of the work.

The client claims that the incomplete service caused financial damage.

Whether this type of dispute is covered depends on the policy language.

This distinction is important because not every disagreement between a client and professional qualifies as an insured claim.

5. Defense Costs

A professional liability policy may provide legal defense for covered claims.

This can be particularly valuable because defending a lawsuit can be expensive even when the professional believes the allegations are unfounded.

Depending on the policy, defense-related expenses may include:

• Attorney fees
• Court costs
• Investigation expenses
• Expert-related costs
• Settlement negotiations

The treatment of defense costs varies by policy.

Some policies have defense costs within the liability limit, meaning defense expenses reduce the amount available for settlements or judgments.

Always check the policy wording.

6. Certain Claims of Financial Loss

Professional liability insurance is particularly associated with claims involving financial losses allegedly caused by professional services.

For example, a business consultant provides a strategy that the client claims resulted in lost revenue.

Unlike a typical general liability claim involving physical injury or property damage, the central issue may be financial harm resulting from professional advice.

An E&O policy may address such a claim if it falls within its coverage.

7. Certain Negligent Acts

Professional liability policies can cover certain allegations involving negligent acts related to professional services.

The precise definition of negligence varies depending on the applicable law and policy.

The policy may establish what constitutes a covered professional service and what types of claims are excluded.

Professionals should therefore avoid assuming that every negligence allegation is automatically covered.

Examples of Professional Liability Insurance Claims

Here are simplified examples showing how E&O insurance can apply across different industries.

Profession	Potential Claim
Business consultant	Client alleges incorrect advice caused financial losses.
Accountant	Client alleges a professional calculation error.
IT consultant	Client alleges a technology recommendation caused disruption.
Marketing agency	Client alleges professional work caused financial damage.
Graphic designer	Client alleges an error caused business losses.
Management consultant	Client alleges a strategy recommendation was negligent.
Real estate professional	Client alleges a professional mistake caused financial loss.
Engineer	Client alleges an error in professional work.

Whether insurance responds depends on the actual policy and circumstances.

What Does Professional Liability Insurance Not Cover?

Understanding exclusions is just as important as understanding coverage.

Professional liability insurance generally does not cover every possible business dispute or loss.

Depending on the policy, exclusions may apply to:

• Intentional wrongdoing
• Fraud
• Criminal acts
• Certain contractual liabilities
• Bodily injury
• Property damage
• Employment-related claims
• Certain cyber incidents
• Certain intellectual property disputes
• Personal disputes unrelated to professional services

The exact exclusions vary.

Bodily Injury

If a customer slips and falls at your office, professional liability may not be the primary insurance.

General liability insurance may be more relevant to a covered third-party bodily injury claim.

Property Damage

If a consultant accidentally damages a client’s physical property, general liability may be relevant, depending on the circumstances and the policy.

Professional liability is primarily designed around professional service exposures rather than ordinary physical property damage.

Intentional Acts

Insurance generally does not exist to protect businesses from intentional wrongdoing.

Policies commonly contain exclusions for intentional, fraudulent, or criminal conduct.

Employment Claims

Claims involving employees can require different coverage.

Examples include certain allegations involving:

• Wrongful termination
• Discrimination
• Harassment
• Employment practices

Employment practices liability insurance, or EPLI, may be relevant to certain employment-related claims.

Professional Liability vs. General Liability

The two policies address different types of risk.

Professional Liability	General Liability
Professional errors	Third-party bodily injury
Professional omissions	Third-party property damage
Certain professional negligence	Certain premises and operations claims
Certain financial losses from professional services	Certain personal and advertising injury
E&O exposures	Commercial liability exposures

Simple Example

A consultant advises that a client’s claims caused financial losses.

Professional liability may be relevant.

The consultant visits the client’s office and accidentally breaks a piece of equipment.

General liability may be relevant.

This is why some businesses carry both policies.

Professional Liability vs. Cyber Liability

Technology-dependent businesses may also need cyber insurance.

Professional liability generally focuses on certain claims arising from professional services.

Cyber liability may address certain risks involving:

• Data breaches
• Cyberattacks
• Privacy incidents
• Network security events
• Certain notification expenses

These policies can overlap in some circumstances, particularly for technology companies, but they are not automatically interchangeable.

Some insurers offer specialized policies combining technology E&O and cyber coverage.

Does Professional Liability Cover Breach of Contract?

This is an area where business owners need to be careful.

Some professional liability policies may cover certain claims that include allegations of breach of contract, while others contain contractual liability exclusions or limitations.

Simply failing to meet a contractual obligation does not automatically mean the resulting dispute is covered.

For example, a client may sue a consultant for delivering a project late.

Whether the policy responds depends on the circumstances and policy language.

Professionals should review important contracts with qualified legal counsel and insurance professionals.

Does Professional Liability Cover Legal Fees?

A professional liability policy may provide defense for covered claims.

This can be one of the most valuable parts of the coverage.

A business may face substantial legal expenses simply responding to an allegation.

However, defense provisions differ.

Before purchasing a policy, ask:

• Are defense costs inside or outside the policy limit?
• Is there a deductible?
• Can the insurer select defense counsel?
• What are the claim reporting requirements?
• Are expert witness costs covered?

Understanding these provisions can help you compare policies more effectively.

Is Professional Liability Insurance Claims-Made?

Many professional liability policies are written on a claims-made basis.

This means the timing of the claim can be critical.

A professional may need to maintain continuous coverage and understand:

• Retroactive dates
• Prior acts coverage
• Claim reporting requirements
• Extended reporting periods

Why the Retroactive Date Matters

The retroactive date may determine how far back covered professional services can extend.

For example, suppose a consultant has a policy with a retroactive date of January 1, 2025.

A claim made during the current policy period involving professional services performed before that date may not be covered, depending on the policy.

This is why professionals who are changing insurance carriers should carefully compare retroactive dates.

What Is Prior Acts Coverage?

Prior acts coverage can protect certain professional services performed before the current policy period, subject to the policy’s conditions and retroactive date.

This can be particularly important for established consultants and professional firms.

If you have maintained continuous E&O insurance, ask whether your prior professional work remains protected when switching insurers.

Does Professional Liability Cover Subcontractors?

Coverage for subcontractors depends on the policy.

Some professional liability policies may provide coverage for certain acts of individuals working on behalf of the insured, while others may impose specific requirements.

Businesses that regularly use subcontractors should disclose this to the insurer.

You may also want subcontractors to maintain their own professional liability coverage.

A written contract should clearly establish responsibilities and insurance requirements.

How Much Professional Liability Coverage Do You Need?

There is no universal coverage amount.

Some businesses purchase:

• $500,000
• $1 million
• $2 million
• $5 million or more

The appropriate limit depends on factors such as:

Factor	Why It Matters
Industry	Different professions have different exposures.
Revenue	Higher activity can increase exposure.
Client contracts	Contracts may require minimum limits.
Project size	Larger projects may create greater potential losses.
Claims history	Past claims can affect underwriting.
Services provided	Specialized services may have different risks.

Do not choose a limit based solely on price.

How Much Does Professional Liability Insurance Cost?

Premiums vary significantly among businesses.

Insurers may consider:

• Profession
• Annual revenue
• Number of employees
• Location
• Services provided
• Claims history
• Coverage limits
• Client industries

A freelance consultant may have a very different premium from a large engineering company.

The best way to determine your cost is to obtain quotes based on accurate business information.

Who Should Consider Professional Liability Insurance?

Professional liability insurance may be appropriate for businesses where clients depend on specialized expertise.

Examples include:

• Consultants
• Accountants
• IT professionals
• Marketing agencies
• Designers
• Architects
• Engineers
• Financial professionals
• Real estate professionals
• Business coaches
• Technology companies
• Freelancers

The need for coverage depends on the services provided and the potential risks involved.

How to Determine Whether You Need E&O Insurance

Ask yourself these questions:

Do clients rely on my professional advice?

If yes, professional liability may be relevant.

Could a professional mistake cause a client financial loss?

If yes, E&O coverage may be worth considering.

Does my client contract require professional liability insurance?

If yes, you may need to meet specific coverage requirements.

Do I provide services that involve specialized expertise?

If yes, review your professional liability exposure.

Do I also interact with customers or work on customer property?

If yes, general liability may also be necessary.

Professional Liability Insurance Checklist

Question	Review
Are all professional services disclosed?	✓
Are the coverage limits adequate?	✓
Are exclusions understood?	✓
Is the policy claims-made?	✓
What is the retroactive date?	✓
Is prior acts coverage included?	✓
Are defense costs inside or outside the limits?	✓
Do client contracts require E&O coverage?	✓
Do you need general liability too?	✓
Do you need cyber insurance?	✓

Final Thoughts

So, what does professional liability insurance cover?

In general, professional liability insurance is designed to address certain claims arising from professional services, including allegations involving errors, omissions, negligence, or other covered professional mistakes.

For a consultant, that might mean an allegation that incorrect advice caused financial losses. For an accountant, it could involve an alleged error in professional work. For an IT professional, it could involve a claim that a technology service or recommendation caused financial harm.

However, E&O insurance does not cover every type of business claim. General liability is typically more relevant to third-party bodily injury and property damage claims, while cyber liability may address data and network risks.

Many professional businesses therefore need to evaluate several types of coverage rather than relying on a single policy.

Before purchasing professional liability insurance, carefully review your professional services, client contracts, policy limits, exclusions, claims-made provisions, retroactive date, and prior acts coverage.

Because insurance requirements and policies vary across the United States, consider speaking with a licensed insurance agent or broker who understands your profession and state.

The most useful policy is not necessarily the cheapest one. It is the policy that accurately reflects your professional services and provides appropriate protection against the types of claims your business could realistically face.