Professional Liability / Errors & Omissions (E&O) for small businesses
Professional liability insurance — also called errors and omissions (E&O) insurance — covers claims that a business's professional advice, services, or work caused a client financial loss due to a mistake, oversight, missed deadline, or failure to deliver promised results.
Professional liability insurance — also called errors and omissions (E&O) insurance — covers claims that a business's professional advice, services, or work caused a client financial loss due to a mistake, oversight, missed deadline, or failure to deliver promised results.1 The coverage is foundational for any business selling expertise or services rather than physical goods: consultants, accountants, lawyers, architects, engineers, IT consultants, marketing agencies, real estate agents, and healthcare providers (where it is usually called medical malpractice). Across Insureon's small-business marketplace, small businesses pay a median of approximately $88 per month for professional liability, with the full annual premium range running $400 to over $7,000 depending on profession, revenue, claims history, and coverage limits.2 Hiscox's 2025 Underinsurance in Small Business Report identifies professional-services firms as a category where underinsurance on E&O limits is disproportionately common — meaning many professional-services businesses carry limits below what a realistic client-loss claim would require.3
This page walks through who needs professional liability, what it covers, what it doesn't, how claims-made coverage works, how to choose limits, how it's priced, and which carriers in our coverage set write professional liability for different buyer profiles.
Who needs professional liability
Any business providing advice, designs, or professional services for a fee.1 The qualifying pattern is that clients pay for expertise or service delivery that, if done incorrectly, could cause the client financial harm. Specifically:
- Consulting and advisory firms — management consultants, IT consultants, business consultants, HR consultants, marketing strategists. Bad advice causing client financial loss is the textbook E&O claim.
- Accounting and financial services — CPAs, bookkeepers, tax preparers, financial advisors, wealth managers. Calculation errors, missed filings, or advisory errors all generate E&O exposure.
- Legal services — attorneys in most states are required to maintain malpractice coverage as a bar-rule or practical-reality requirement.
- Architecture, engineering, and design services — design defects causing client loss are classic E&O exposure; architects and engineers frequently face multi-year tail risk from designs completed years earlier.
- Real estate agents and brokers — most state real estate commissions require E&O coverage; errors in disclosure, contract handling, or fiduciary duty all generate claims.
- Insurance agents and brokers — required to maintain E&O coverage by state insurance departments or industry standards.
- IT consultants and software developers — software defects causing client operational or financial loss, data migration errors, failed implementations.
- Marketing agencies and creative services — missed campaign deadlines, copyright/trademark errors, brand damage from campaign execution.
- Healthcare providers — physicians, dentists, nurses, therapists, and allied health providers need medical malpractice; in some states licensing requires it.
Specific professions where E&O is legally or practically required:
- Real estate agents in several states — state real estate commission rules.
- Attorneys — bar rules in some jurisdictions; functionally required by most law-firm malpractice standards.
- Medical professionals in specific states — state medical licensing.
- Insurance agents and brokers in most states.
Client contracts frequently require $1M or $2M E&O limits as a condition of engagement, particularly for enterprise-client work, government contracts, and long-term professional engagements.
Businesses that typically don't need E&O:
- Pure retail or product-sales businesses with no professional-service component.
- Restaurants, hospitality, and other businesses whose primary exposure is physical rather than advisory.
- Manufacturers whose product-defect exposure is covered under general liability / product liability rather than E&O.
Industry-specific detail: See consultants, accountants, lawyers, marketing agencies, it-consultants, real estate, photographers, and saas-tech industry pages for profession-specific E&O guidance.
What professional liability covers
E&O pays for legal defense costs, settlements, and judgments arising from claims of negligence, misrepresentation, or failure to perform professional services to the standard of care expected in the industry.1 Coverage categories:
- Professional negligence — failing to exercise the standard of care expected of a reasonably competent practitioner in the profession. The most common E&O claim type.
- Breach of professional duty — failure to perform contracted professional services to the agreed standard.
- Errors and omissions — mistakes in professional work product (calculation errors, missed deadlines, procedural errors).
- Misrepresentation — unintentional misstatements or omissions that cause client financial harm.
- Failure to deliver promised results — where the failure stems from professional negligence rather than external factors.
Claims-made coverage structure. E&O policies are almost always written on a claims-made basis, not occurrence-based. This means the policy responding to a claim is the policy in force when the claim is reported, not when the alleged error occurred.
- Retroactive date — the earliest date of alleged wrongful acts the policy will cover. A retroactive date of "full prior acts" covers errors dating back to any point before the policy; a specific retroactive date covers only errors on or after that date.
- Extended reporting period (tail coverage) — if the policyholder cancels or doesn't renew, they can usually purchase a tail endorsement extending the reporting window for claims arising from prior-acts errors. Tail coverage is essential for retiring professionals and for businesses changing carriers.
Defense coverage structure. E&O policies typically pay defense costs within the policy limits — defense costs erode the settlement amount available. A $1M E&O policy may effectively deliver $600K-$800K for settlement if defense runs $200K-$400K. Some policies offer defense outside limits at higher premium; most small-business E&O is defense-within-limits.
Medical malpractice subset. For physicians, nurse practitioners, and allied health providers, professional liability is usually written as medical malpractice coverage with specific per-incident and aggregate structures. This page covers the broader small-business E&O market; medical malpractice has profession-specific underwriting that varies by specialty and state.
What professional liability doesn't cover
E&O is tightly scoped to professional errors causing client financial loss. Standard exclusions:1
- Bodily injury and property damage — addressed by general liability. A consultant whose advice leads a client into a bad deal has E&O exposure; a consultant whose briefcase falls on a client's foot has GL exposure.
- Intentional wrongdoing, fraud, and criminal acts — always excluded, typically subject to "final adjudication" language (defense advanced until a final ruling confirms intentional misconduct).
- Insured-vs-insured disputes — claims between the insured and its own co-owners, officers, or employees are typically excluded under E&O; covered under D&O or EPLI depending on the nature.
- Warranty disputes — express warranty breaches are typically excluded; professional-negligence claims arising from the same work are covered.
- Employment practices claims — addressed by EPLI.
- Breach of express contract — in most E&O forms, claims based purely on breach of contract (as opposed to professional negligence) are excluded or narrowly covered.
- Prior known acts — errors known to the insured before the retroactive date of the policy are excluded.
- Cyber incidents and data breaches — typically addressed by cyber liability, though some E&O forms include sublimits for limited cyber exposure.
- Bodily injury even when professionally related — a physical therapist whose treatment injures a patient has E&O exposure for the professional-care claim and often GL/medical-malpractice exposure for the bodily-injury component.
Carrier-approved defense counsel. Many E&O policies require the insured to use defense counsel approved or assigned by the carrier. Independent counsel at the insured's expense is possible but uncommon in small-business E&O.
Policy limits and how to choose them
E&O limits are per-claim and aggregate. Standard structures:
- $250K–$1M per claim / $500K–$1M aggregate — common for solo practitioners and micro-businesses.
- $1M–$2M per claim / $2M aggregate — common for 5-25-person professional services firms; frequently the limit required by client contracts.
- $2M–$5M+ per claim / aggregate — growing firms, specialty practices, firms with enterprise-client contracts.
Defense within limits erodes the settlement amount. A $1M E&O claim defended through trial can consume $200K-$500K in defense before settlement, leaving $500K-$800K effective. Higher limits are a partial hedge against defense erosion.
Retroactive date strategy.
- Full prior acts — the strongest position; covers errors regardless of when they occurred as long as the claim is reported during an active policy period. Best for established practices changing carriers.
- Specific retroactive date — limits coverage to errors on or after a fixed date. More common for newer practices or where prior-acts coverage isn't available.
- "Inception date = retroactive date" — the weakest position; covers only errors during the current policy period. Creates a gap in coverage for errors made before the policy started.
Extended reporting period (tail) strategy.
- Retiring professionals typically need a 5-10 year tail to cover the statute-of-limitations window on claims that may surface years after practice ends.
- Businesses changing carriers often buy a short tail (30-90 days) while onboarding the new carrier on prior-acts coverage, or negotiate tail-on-non-renewal in the expiring policy.
Deductibles. E&O deductibles vary widely — $1,000-$25,000+ for small-business E&O. Higher deductibles reduce premium meaningfully; the trade-off is higher out-of-pocket per claim.
Cost and how to buy professional liability
For full cost analysis with industry breakdowns, top carriers by published starting price, and 2026 benchmark data, see our professional liability / errors & omissions (e&o) cost guide.
Marketplace cost data. Insureon reports small-business professional liability median at $88/month, with annual premiums ranging $400 to over $7,000 depending on profession, revenue, claims history, and coverage limits.2
What drives E&O price:
- Profession / industry class. The single biggest cost driver. A marketing consultant may pay near the bottom of the range; a medical malpractice policy for an obstetrician may cost $40,000+/yr.
- Revenue. Higher-revenue practices have higher exposure and pay more.
- Claims history. Prior E&O claims raise premium materially; 3-5 years of clean claims history is the typical underwriting window.
- Years in practice. New practitioners often face higher premiums; established practitioners with demonstrated procedures qualify for better rates.
- Coverage limits and retroactive date. Higher limits and earlier retroactive dates raise premium.
- State. High-litigation states raise premium; some specialty coverages (medical malpractice) have state-specific legislation that dramatically affects pricing.
Carriers and placement paths:
- Hiscox — PL from $22.50/mo on A-rated US paper; professional-services specialty.4
- NEXT Insurance — PL available on A+ paper; standard small-business E&O.5
- biBerk — PL on A++ Berkshire Hathaway paper; starting price not publicly published.
- Thimble — PL on A+ Arch-backed paper with on-demand duration options for gig-economy professionals.6
- Embroker — Tech E&O as part of the Startup Package on Munich Re-backed paper; tech-specialty underwriting.7
- Simply Business — PL panel placement across 8-carrier roster including Hiscox, Markel, Liberty Mutual.8
What underwriters evaluate: specific professional services performed, revenue, years in practice, prior 3-5 years of claims history, professional credentials and licensure, HR policies (for firms), quality-control and peer-review processes, retention of work product, and contract review practices.
State-by-state requirements for professional liability
Professional liability is not mandated by state statute as a universal business requirement,1 but is required for specific licensed professions in specific states:
- Real estate agents — state real estate commissions in several states require E&O coverage; California,9 Florida,10 and Texas11 are among the states with formal or practical E&O requirements for licensed real estate professionals.
- Attorneys — bar rules in some jurisdictions require malpractice coverage; functionally required for most law firms via malpractice-insurance carriers.
- Medical professionals — state medical boards in several jurisdictions require malpractice coverage as a licensing condition; New York DFS12 oversees the state insurance market where medical malpractice is placed.
- Insurance agents and brokers — most state insurance departments require agents to maintain E&O coverage.
These are profession-specific licensing requirements, not blanket state mandates for all businesses. Buyers should confirm specific licensing requirements through their state's licensing board or professional association.
Frequently asked questions
What's the difference between professional liability and general liability?
General liability covers third-party bodily injury, property damage, and personal injury. Professional liability covers financial loss to clients arising from mistakes in the business's professional services. A consultant's bad advice that costs a client $500K is PL; a consultant whose laptop bag trips a client causing injury is GL.
What does "claims-made" mean for E&O?
Claims-made coverage means the policy responding to a claim is the one in force when the claim is reported, not when the alleged error was made. This matters for continuity of coverage — gaps between policies can leave prior errors uncovered.
What's a retroactive date?
The earliest date of alleged wrongful acts the policy will cover. "Full prior acts" means unlimited retroactive coverage; a specific retroactive date means only errors on or after that date are covered.
Do I need tail coverage when I change E&O carriers?
Usually not — the new carrier typically provides prior-acts coverage that covers errors from before the new policy started, as long as there's no coverage gap. Tail coverage matters most for business closure, retirement, or insurance program termination.
How much does professional liability cost?
Insureon reports a median of $88/month across small-business E&O, with annual premiums ranging $400 to over $7,000 depending on profession, revenue, and coverage limits.2
Is E&O required by law?
Not universally. Specific licensed professions in specific states require E&O (real estate, attorneys in some jurisdictions, medical, insurance agents), but no state mandates E&O for all businesses.1
What's the difference between E&O and D&O?
E&O covers claims from clients alleging professional-service errors. D&O covers claims from shareholders, investors, employees, and regulators alleging wrongful acts in corporate management. Both can apply to the same business — a SaaS company's bad technical implementation is E&O; the same company's shareholder suit alleging board-level misconduct is D&O.
Does E&O cover cyber incidents?
Generally no — cyber exposure is addressed by cyber liability insurance. Some E&O forms include limited cyber sublimits; dedicated cyber coverage is typically more capable for meaningful exposure.
What's medical malpractice?
Medical malpractice is professional liability for physicians, nurse practitioners, dentists, and allied health providers. It has profession-specific underwriting (varies by specialty) and state-specific legislative frameworks (caps on damages in some states, specific consent-to-settle provisions) that distinguish it from general small-business E&O.13
Related policies
Professional liability pairs with several related lines:
- General liability — covers bodily injury and property damage that E&O excludes.
- Directors & officers (D&O) — covers management claims; often bought alongside E&O for growing firms.
- Employment practices liability (EPLI) — covers employment claims that E&O excludes.
- Cyber liability — covers cyber incidents that E&O typically excludes.
- Business owner's policy (BOP) — professional-services firms typically carry a BOP for GL and property alongside E&O.
Citations
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Errors and Omissions Insurance (E&O) — https://www.insureon.com/small-business-insurance/errors-omissions ↩ ↩2 ↩3 ↩4 ↩5 ↩6
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E&O Insurance Cost — https://www.insureon.com/small-business-insurance/errors-omissions/cost ↩ ↩2 ↩3
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Hiscox 2025 Underinsurance in Small Business Report — https://www.hiscox.com/underinsurance ↩
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Hiscox Small Business Insurance — https://www.hiscox.com/small-business-insurance ↩
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NEXT business insurance overview — https://www.nextinsurance.com/business-insurance/ ↩
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Thimble — Small Business Insurance Starting at $17 — https://www.thimble.com/small-business-insurance ↩
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embroker.com — Startup Insurance — https://www.embroker.com/coverage/startup-insurance/ ↩
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Simply Business — Insurance Providers panel — https://www.simplybusiness.com/business-insurance/insurance-providers/ ↩
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California Department of Insurance — https://www.insurance.ca.gov ↩
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Florida Office of Insurance Regulation — https://www.floir.com ↩
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Texas Department of Insurance — https://www.tdi.texas.gov ↩
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New York State Department of Financial Services — https://www.dfs.ny.gov ↩
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PubMed - Malpractice Claims Related to Diagnostic Errors — https://pubmed.ncbi.nlm.nih.gov/28794243/ ↩
See which carriers fit your business.
Tell us about your business. We'll rank the carriers in our coverage set by industry fit, state availability, and your selected coverages.
Top carriers
Compare top professional liability / errors & omissions (e&o) carriers
Recommended carriers for this coverage, ranked against our 6-dimension methodology.
Sub-threshold = fewer than 20 NAIC complaints in 3 years (data is too sparse to score reliably). N/A (broker) = not a carrier. See full methodology →
| Carrier | Our score | Positioning | Starting price | Coverage | Claims | AM Best | NAIC index | States | Quote channel |
|---|---|---|---|---|---|---|---|---|---|
 | 7.0 | Professional services E&O focus | GL $30/mo | 7.5/10 | 8.0/10 | A | 8.15 | 50 states | Direct online |
 | 7.8 | Digital-native micro-business | Cyber $4/mo | 7.0/10 | 7.5/10 | A+ | Sub-threshold | 50 states | Direct online |
 | 7.2 | Berkshire-backed contractual umbrella | GL $28/mo | 8.0/10 | 8.0/10 | A++ | 13.25 | 50 states | Direct online |
 | 7.4 | Gig and event-based | GL $17/mo | 6.5/10 | 7.0/10 | A+ | Sub-threshold | 50 states | Direct online |
 | 7.0 | Venture-backed tech & SaaS | — | 7.0/10 | 7.0/10 | — | N/A (broker) | 50 states | Broker portal |
 | 8.1 | Broker comparing 8+ carriers | GL $21/mo | 8.5/10 | 7.5/10 | — | N/A (broker) | 50 states | Broker portal |
About complaint index data: Values are 3-year averages from NAIC Consumer Information Source for commercial liability. Carriers with fewer than 20 complaints in the 3-year window are labeled "sub-threshold". A reliability call about data volume, not a finding about the carrier. Brokers (Category D) are structurally N/A. See our complete methodology.
- 7.0
- Positioning
- Professional services E&O focus
- Starting price
- GL $30/mo
- Coverage
- 7.5/10
- Claims
- 8.0/10
- AM Best
- A
- NAIC index
- 8.15
- States
- 50 states
- Quote channel
- Direct online
- 7.8
- Positioning
- Digital-native micro-business
- Starting price
- Cyber $4/mo
- Coverage
- 7.0/10
- Claims
- 7.5/10
- AM Best
- A+
- NAIC index
- Sub-threshold
- States
- 50 states
- Quote channel
- Direct online
- 7.2
- Positioning
- Berkshire-backed contractual umbrella
- Starting price
- GL $28/mo
- Coverage
- 8.0/10
- Claims
- 8.0/10
- AM Best
- A++
- NAIC index
- 13.25
- States
- 50 states
- Quote channel
- Direct online
- 7.4
- Positioning
- Gig and event-based
- Starting price
- GL $17/mo
- Coverage
- 6.5/10
- Claims
- 7.0/10
- AM Best
- A+
- NAIC index
- Sub-threshold
- States
- 50 states
- Quote channel
- Direct online
- 7.0
- Positioning
- Venture-backed tech & SaaS
- Starting price
- —
- Coverage
- 7.0/10
- Claims
- 7.0/10
- AM Best
- —
- NAIC index
- N/A (broker)
- States
- 50 states
- Quote channel
- Broker portal
- 8.1
- Positioning
- Broker comparing 8+ carriers
- Starting price
- GL $21/mo
- Coverage
- 8.5/10
- Claims
- 7.5/10
- AM Best
- —
- NAIC index
- N/A (broker)
- States
- 50 states
- Quote channel
- Broker portal
Full per-carrier analysis lives in each carrier review. See our scoring methodology for how we weight the dimensions above.
See which carriers fit your business.
Tell us about your business. We'll rank the carriers in our coverage set by industry fit, state availability, and your selected coverages.