What Is CPA Professional Liability Insurance?
CPA professional liability insurance — also known as Errors & Omissions (E&O) insurance — protects accountants against claims of negligent professional services. If a client alleges that your work caused them financial harm, E&O coverage pays for your legal defense and any resulting settlements or judgments.
For CPAs, common claims include:
- Tax preparation errors that result in IRS penalties or missed deductions
- Missed filing deadlines that trigger late fees or lost refund opportunities
- Audit mistakes in financial statements that mislead investors or lenders
- Incorrect financial advice that leads to poor business decisions
- Failure to detect fraud during an audit engagement
E&O insurance for CPA firms typically costs $1,200–$4,000 per year depending on firm size, services offered, revenue, and claims history.
Why Every CPA Needs E&O Insurance
Even the most careful accountant can face a claim. Consider these scenarios:
- A tax return error triggers an IRS audit and $50,000 in penalties — your client sues you for the amount plus legal costs
- You miss a deadline for filing a corporate extension — the client incurs late fees and blames your firm
- An audit opinion misses a material misstatement — investors lose money and allege negligence
- A client follows your tax planning advice and later discovers it created an unintended liability
Without E&O insurance, you would pay legal defense costs out of pocket — even if the claim is frivolous. Defense costs alone can exceed $50,000, and settlements often reach six figures.
→ Compare CPA E&O insurance quotes from top carriers
Bundle E&O with Cyber for Complete Protection
Modern CPA practices face both professional liability and cyber risks — and the two often overlap. A phishing attack that compromises your email could lead to both a data breach (cyber claim) and a missed deadline (E&O claim).
Bundling E&O and cyber insurance provides:
- 10–20% premium savings vs. purchasing separately
- No coverage gaps between policies
- Single deductible for incidents that trigger both coverages
- Streamlined claims process with one carrier
Hartford and Chubb both offer purpose-built E&O + cyber bundles for accounting professionals.
Top Carriers for CPA Professional Liability
- Hartford: Competitive rates for firms under $5M revenue, strong claims handling, excellent bundle options with cyber and BOP
- Chubb: Premium E&O coverage with higher limits, dedicated accounting industry underwriters, risk management resources
- Hiscox: Streamlined online process for solo CPAs and small firms, quick quotes, competitive rates
- Cowbell: Innovative bundled policies with AI-powered risk assessment
→ See what your CPA firm would pay for E&O coverage
CPA E&O Insurance Cost Guide
| Firm Profile | Typical Annual Premium |
|---|---|
| Solo CPA (tax prep only) | $1,200–$2,000/yr |
| Solo CPA (tax + advisory) | $1,800–$2,800/yr |
| Small firm, 2–5 CPAs | $2,500–$4,000/yr |
| Mid-size firm, 6–15 CPAs | $4,000–$8,000/yr |
| Firm with audit services | +20–40% premium |
| E&O + Cyber bundle | Save 10–20% |
Key factors: services performed (audit work costs more), annual revenue, number of clients, claims history, and whether you offer advisory or consulting services.
What CPA E&O Insurance Covers
- Legal defense costs: Attorney fees, court costs, and expert witnesses — even for groundless claims
- Settlements and judgments: Amounts you are legally obligated to pay a client
- Disciplinary proceedings: Defense costs if a state board of accountancy investigates your work
- Subpoena assistance: Costs associated with responding to subpoenas related to your professional work
- Prior acts coverage: Claims arising from work performed before the policy inception date (if selected)
