Quick Answer: How much does CPA E&O insurance cost?
$67 to $1,000 per month ($800–$12,000/year) depending on firm size, services offered, revenue, and claims history. Solo CPAs can get coverage starting at just $67/mo.
CPA E&O Insurance Cost by Firm Size
| Firm Size | Monthly Cost | Annual Cost | Typical Limits |
|---|---|---|---|
| Solo CPA | $67–$150/mo | $800–$1,800/yr | $500K / $500K |
| Small firm (2-5 CPAs) | $150–$350/mo | $1,800–$4,200/yr | $1M / $1M |
| Mid-size firm (6-20 CPAs) | $350–$650/mo | $4,200–$7,800/yr | $1M–$3M |
| Large firm (20-50 CPAs) | $650–$1,000/mo | $7,800–$12,000/yr | $3M–$5M |
These are national averages based on standard E&O coverage with claims-made policies. Your actual premium depends on several factors we'll break down below.
What Is CPA E&O Insurance?
Errors and Omissions (E&O) insurance — also called professional liability insurance — protects CPAs and accounting firms against claims arising from professional mistakes, negligence, or failure to perform services. If a client sues you for a tax filing error that cost them $50,000 in penalties, E&O insurance covers your legal defense costs and any settlement or judgment.
For CPAs specifically, E&O insurance covers:
- Tax preparation errors — incorrect filings, missed deductions, calculation mistakes
- Audit and assurance failures — failure to detect material misstatements
- Advisory negligence — bad financial advice that causes client losses
- Missed deadlines — late filings resulting in penalties or lost benefits
- Data errors — incorrect financial statements or bookkeeping mistakes
- Regulatory defense — IRS audits triggered by your work
Most state CPA boards don't legally require E&O insurance, but many clients — especially business clients — require proof of coverage before engagement. And any CPA firm that performs audits or attestation services essentially needs it to operate.
What Drives the Cost of CPA E&O Insurance?
1. Firm Size & Revenue
The single biggest factor. More CPAs and higher revenue means more client engagements, more potential for errors, and higher exposure. A solo CPA earning $150K pays dramatically less than a 30-person firm billing $8M.
2. Services Offered
Not all CPA services carry equal risk:
| Service Type | Risk Level | Premium Impact |
|---|---|---|
| Audit & attestation | 🔴 High | +30-50% |
| Business valuation | 🔴 High | +25-40% |
| Tax preparation | 🟡 Medium | Baseline |
| Bookkeeping only | 🟢 Lower | -15-25% |
| Payroll services | 🟡 Medium | +5-15% |
| Financial advisory / wealth mgmt | 🔴 High | +20-35% |
Audit and attestation services carry the highest risk because you're putting your professional stamp on financial statements that investors, lenders, and regulators rely on. A missed material misstatement can result in multimillion-dollar claims.
3. Claims History
Prior E&O claims are the fastest way to see your premiums spike. One claim can increase premiums 25-50%. Two or more claims within 5 years can make you difficult to insure through standard markets.
If you have claims history:
- Hartford and CNA are typically more flexible with prior claims
- Chubb requires clean history for their best rates
- Consider higher deductibles to offset premium increases
4. Client Types
Serving publicly traded companies, government agencies, or financial institutions increases your E&O exposure — and your premiums. A CPA firm doing individual tax returns carries less risk than one auditing public companies under PCAOB standards.
5. Geographic Location
Premiums vary by state due to different legal environments and claim frequencies:
| State/Region | Premium Impact |
|---|---|
| New York, California, Florida | +15-25% above average |
| Texas, Illinois, New Jersey | +5-15% above average |
| Midwest & Mountain states | Baseline |
| Rural areas | -5-10% below average |
6. Coverage Limits & Deductible
Higher limits and lower deductibles increase your premium. The most common configurations for CPA firms:
- Solo CPA: $500K/$500K limits, $2,500 deductible
- Small firm: $1M/$1M limits, $5,000 deductible
- Mid-size firm: $1M–$3M limits, $5,000–$10,000 deductible
- Large firm: $3M–$5M limits, $10,000–$25,000 deductible
📊 Not sure what coverage you need? Compare CPA E&O quotes from top carriers →
Carrier Price Comparison for CPA E&O
We independently compared the top 5 carriers for CPA E&O insurance. Here's what we found:
| Carrier | Starting Price | Best For | AM Best Rating |
|---|---|---|---|
| Hartford | $67/mo | Best overall value for small firms | A+ |
| CNA | $85/mo | Accounting industry specialist | A |
| Hiscox | $75/mo | Solo CPAs, online application | A |
| Travelers | $90/mo | Bundling with other coverages | A++ |
| Chubb | $125/mo | Premium coverage, large firms | A++ |
Hartford — Best Overall Value
Hartford consistently offers the most competitive pricing for small to mid-size CPA firms. Their CPA-specific policy includes:
- Defense costs outside the limit (doesn't erode your coverage)
- Regulatory proceedings coverage including IRS/state board defense
- Prior acts coverage from inception
- Disciplinary proceedings coverage
- Network security incident coverage add-on
Hartford's online application takes about 15 minutes and they can bind coverage same-day. Their claims handling is solid — they assign dedicated claims attorneys who understand accounting malpractice.
CNA — Accounting Industry Specialist
CNA has insured accounting firms for over 50 years through their partnership with the AICPA. Their CPA-specific policy is one of the most comprehensive available:
- Includes subpoena assistance coverage
- Free risk management resources through the AICPA program
- Broad prior acts coverage
- Identity theft defense for client data exposure
- Deposition coverage
CNA's specialty expertise means they understand the nuances of accounting claims better than generalist carriers. They're slightly more expensive than Hartford but the AICPA program provides risk management credits of 5-10%.
Hiscox — Best for Solo CPAs
Hiscox shines for solo practitioners and very small firms. Their advantages:
- Entirely online application — quote in minutes
- Monthly payment options with no extra fees
- $0 deductible option available
- Broad professional services definition
- Easy to add coverage for bookkeeping, consulting, and payroll
Hiscox's policies are more standardized, so they may not offer the customization larger firms need. But for solos doing tax prep and bookkeeping, they're hard to beat.
Travelers — Best for Bundling
Travelers offers excellent multi-policy discounts if you bundle E&O with general liability, cyber, and property coverage. Key features:
- Multi-policy discount of 10-15%
- Strong A++ AM Best rating
- Broad definitions of professional services
- Worldwide coverage available
- Experienced claims handling team
Chubb — Premium Coverage for Large Firms
Chubb is the luxury option — higher premiums but superior coverage. Best for mid-size to large firms that need:
- Maximum limits ($5M+ available)
- Broadest coverage definitions
- Worldwide protection
- Claims-made with full retroactive dating
- Extensive risk management support
- Dedicated account team
Chubb's claims-paying ability is unmatched (A++ rating) and they rarely dispute covered claims. If you can afford the premium, Chubb provides the most peace of mind.
💡 Want to see your actual pricing from these carriers? Compare CPA E&O quotes side-by-side →
How to Lower Your CPA E&O Premium
1. Choose the Right Deductible
Increasing your deductible from $2,500 to $5,000 typically saves 8-12% on your premium. Going to $10,000 saves 15-20%. If your firm can absorb a $10K hit, the savings add up over years of claims-free operation.
2. Implement Quality Control Procedures
Many carriers offer premium credits for documented quality control:
- Engagement letter requirements for all clients
- Peer review procedures
- Continuing education above minimums
- Documented supervisory review processes
- Client acceptance/continuance policies
CNA offers 5-10% premium credits through the AICPA risk management program for completing their QC modules.
3. Limit High-Risk Services
If audit and attestation services make up a small portion of your revenue but significantly increase your premium, consider whether those services justify the cost. Some firms save 20-30% by dropping audit services and focusing on tax and advisory.
4. Bundle Coverage
Most carriers offer 10-15% discounts when you bundle E&O with:
- General liability
- Cyber liability
- Business owner's policy (BOP)
- Workers' compensation
5. Maintain a Clean Claims Record
This is obvious but worth emphasizing: five consecutive claims-free years can qualify you for premium discounts of 10-20% with most carriers.
6. Use Engagement Letters — Always
This isn't just a best practice — it's a premium reducer. Carriers view firms that consistently use engagement letters as lower risk. The letter sets scope, limits liability, and creates a clear record of what was agreed upon.
Claims-Made vs. Occurrence Policies
Virtually all CPA E&O policies are claims-made, which means:
- The policy must be active when the claim is made (not when the error occurred)
- You need retroactive coverage (prior acts date) to cover past work
- If you cancel the policy, you need an extended reporting period (ERP) or "tail coverage"
Why This Matters for Your Cost
Claims-made policies start cheaper and increase annually until they reach "mature" rates — usually after 5 years. A first-year claims-made policy might be 40-50% of the mature rate.
| Policy Year | % of Mature Rate | Example (Solo CPA) |
|---|---|---|
| Year 1 | 45-55% | $67/mo |
| Year 2 | 60-70% | $85/mo |
| Year 3 | 75-80% | $100/mo |
| Year 4 | 85-90% | $115/mo |
| Year 5+ (Mature) | 100% | $130/mo |
Tail Coverage Costs
If you retire or close your firm, you'll need an Extended Reporting Period (ERP) — also called tail coverage — to protect against claims from past work. Typical tail coverage costs:
- 1-year tail: 75-100% of final annual premium
- 3-year tail: 150-200% of final annual premium
- Unlimited tail: 200-300% of final annual premium
Some carriers include free automatic tail coverage if you retire after being insured with them for a certain number of years (typically 5-10 years). CNA's AICPA program offers this benefit, making it especially attractive for CPAs planning retirement.
What CPA E&O Insurance Covers (and Doesn't)
Covered
- Legal defense costs — attorney fees, court costs, expert witnesses
- Settlements and judgments — amounts you're legally obligated to pay
- Tax preparation errors — incorrect calculations, missed deductions, wrong filing status
- Audit failures — failure to detect material misstatements
- Advisory errors — financial planning mistakes, incorrect business valuations
- Missed deadlines — late filings, expired statutes of limitations
- Regulatory proceedings — IRS investigations, state board inquiries
- Client data breach — some policies include limited cyber coverage
Not Covered
- Intentional fraud or dishonesty — deliberate falsification, embezzlement
- Criminal acts — willful violations of law
- Bodily injury or property damage — that's general liability
- Employment disputes — need employment practices liability (EPL)
- Breach of contract — unless related to professional services
- Fines and penalties against you — regulatory fines are typically excluded
- Prior known claims — incidents you knew about before buying the policy
Real-World CPA E&O Claims Examples
Understanding actual claims helps you see why E&O coverage is essential:
Example 1: Tax Filing Error — $180,000 Claim
A CPA prepared a corporate tax return and incorrectly classified capital gains, resulting in the client underpaying by $120,000. After IRS penalties and interest, the client demanded $180,000 in damages. The E&O policy covered the $85,000 settlement plus $45,000 in legal defense costs.
Example 2: Missed Deadline — $95,000 Claim
A CPA failed to file a client's extension on time. The client missed out on a $95,000 tax credit that expired. The E&O carrier defended the case and settled for $72,000.
Example 3: Audit Failure — $1.2M Claim
A mid-size CPA firm performed an audit and failed to identify $800,000 in fictitious receivables. The client's lender relied on the audited statements and lost money. Claim totaled $1.2M. The firm's $2M E&O policy covered the $950,000 settlement and $250,000 in defense costs.
Example 4: Business Valuation Dispute — $340,000 Claim
A CPA provided a business valuation for a divorce proceeding. The opposing side challenged the valuation, and the client claimed the CPA undervalued the business by $340,000. Defense cost $65,000, and the case settled for $145,000 — all covered by E&O.
CPA E&O Insurance Requirements by State
While no state legally mandates E&O insurance for CPAs, several state CPA boards and professional organizations strongly recommend it:
- AICPA membership includes access to the CNA professional liability program
- State CPA societies often negotiate group rates with carriers
- Peer review requirements — firms performing audits must carry adequate E&O
- Client contracts — many business clients require proof of E&O coverage
- Lender requirements — banks often require E&O for firms they work with
Even without legal requirements, operating without E&O insurance exposes your personal assets to professional liability claims. A single claim can exceed $100,000 easily.
How to Buy CPA E&O Insurance
Step 1: Determine Your Coverage Needs
- What services do you offer? (Tax, audit, advisory, bookkeeping)
- What's your annual revenue?
- How many CPAs/employees?
- Any prior claims or incidents?
- What limits do clients require?
Step 2: Compare Multiple Carriers
Don't just accept the first quote. Prices vary significantly between carriers for the same coverage. We recommend comparing at least 3-4 carriers.
Step 3: Review Policy Details
Look beyond price:
- Defense costs — inside or outside the limits?
- Prior acts date — does it cover your entire history?
- Regulatory coverage — includes IRS/state board proceedings?
- Deductible — applies to defense costs or just settlements?
- Consent to settle — can the carrier settle without your approval?
Step 4: Bind Coverage
Most carriers can bind E&O coverage within 24-48 hours. Some (Hartford, Hiscox) offer same-day binding for straightforward applications.
🎯 Ready to compare? Get CPA E&O quotes from top carriers in under 2 minutes →
Frequently Asked Questions
How much does CPA E&O insurance cost for a solo practitioner?
Solo CPA E&O insurance starts at $67/mo ($800/year) for basic tax preparation coverage with $500K limits. If you also provide advisory or audit services, expect $100-$150/mo.
Is CPA E&O insurance tax-deductible?
Yes. CPA E&O insurance premiums are a deductible business expense. You can deduct the full premium as an ordinary business expense on Schedule C (sole proprietor) or your firm's business tax return.
What's the difference between E&O and professional liability insurance?
They're the same thing. "Errors and Omissions" and "professional liability" are interchangeable terms in the accounting industry.
Do I need E&O insurance if I only do bookkeeping?
Bookkeeping is lower risk than tax preparation or audit services, but yes — you should still carry E&O insurance. Even a simple bookkeeping error can result in a client claim. The good news: bookkeeping-only coverage is among the cheapest at $50-$75/mo.
Can I get E&O insurance with prior claims?
Yes, but it will be more expensive. Hartford and CNA are generally more flexible with prior claims. Expect a 25-50% premium increase per claim. After 5 claim-free years, premiums typically return to standard rates.
What limits should I carry?
A common guideline: carry limits equal to your largest client engagement or your annual revenue, whichever is greater. Minimum recommended: $500K for solo CPAs, $1M for firms.
Does E&O insurance cover IRS audits of my clients?
Yes — most CPA E&O policies cover regulatory proceedings, including defense costs when your work product triggers an IRS audit of your client. This is separate from your client's tax audit defense.
What's tail coverage and do I need it?
Tail coverage (Extended Reporting Period) lets you report claims after your policy ends. You need it when you retire, close your firm, or switch to a carrier that won't offer full prior acts coverage. Cost: 75-300% of your final annual premium depending on the tail length.
How quickly can I get CPA E&O coverage?
Most carriers can quote and bind within 24-48 hours. Hartford and Hiscox offer same-day coverage for standard applications. Complex firms (audit practices, prior claims) may take 5-7 business days.
Can I bundle E&O with cyber insurance?
Yes, and you should. Most CPA firms handle sensitive financial data that makes them cyber targets. Hartford, Chubb, and CNA all offer E&O + cyber bundles with 10-15% discounts. See our cyber insurance guide for CPAs for details.
Related Guides
- Complete Accountant & CPA Insurance Guide — Our comprehensive pillar guide covering all insurance types for accounting professionals
- Cyber Insurance for Accountants & CPAs — Protect your firm's data with the right cyber policy
- Insurance for Tax Preparers & Seasonal CPAs — Specialized coverage for tax season professionals
- Best CPA Insurance Carriers Compared — Independent carrier rankings