Accountants Professional Liability Insurance in the United States
110K+APL Claims/Year (U.S.)
$4.2BU.S. APL Market Size 2025
65%Large Firms Insured
30%+Claims from Audit Services
Accountants Professional Liability Insurance — also referred to as CPA E&O Insurance, Accountants Malpractice Insurance, or Accountants Errors and Omissions Insurance — is a specialized form of professional liability insurance designed to protect certified public accountants (CPAs), bookkeepers, enrolled agents, tax preparers, and accounting firms from claims alleging financial loss resulting from professional errors, omissions, or negligence in the performance of accounting services. Unlike general liability insurance (CGL) — which covers bodily injury and property damage — accountants professional liability insurance responds to the financial harm that accounting professionals can cause clients through professional mistakes.
The policy pays for legal defense costs, settlements, and judgments arising from covered claims. Because accounting professionals handle sensitive financial data, prepare tax returns, conduct audits, provide financial statements, and give investment and estate planning advice, they are uniquely exposed to high-value professional liability claims. A single overlooked deduction, an audit oversight, or a missed regulatory deadline can result in a claim worth hundreds of thousands — or even millions — of dollars.
The U.S. market for accountants professional liability insurance reached approximately $4.2 billion in 2025 and continues to grow, driven by rising litigation rates, increasing regulatory complexity, and the expanding scope of services that accounting professionals now provide, including cybersecurity advisory, cryptocurrency tax guidance, and ESG reporting. With over 110,000 professional liability incidents reported annually against accountants and consultants in the U.S., APL insurance has become an essential component of every accounting firm’s risk management strategy.
Insurance Glossary Definition — InsureBlogging.com
Accountants Professional Liability Insurance — A specialized form of professional liability insurance that provides coverage for financial loss caused by professional accounting services, including negligent acts, errors, or omissions committed in the performance of professional duties.
Type: Professional Liability | Also Known As: CPA E&O, Accountants Malpractice Insurance, APL Insurance
Source: IRMI Insurance Definitions; AICPA; NAIC
Accountants Professional Liability (APL) insurance is a claims-made professional liability policy specifically designed for the unique risk profile of accountants. Standard commercial general liability (CGL) policies explicitly exclude professional services — meaning that a CGL policy will not cover a claim arising from an accountant’s professional errors. APL insurance fills this critical gap by covering the professional liability exposures that CPAs, bookkeepers, tax preparers, enrolled agents, and accounting firms face in their day-to-day practice.
The core insuring agreement is broad: the insurer agrees to pay losses and claim expenses (including defense costs) that an insured becomes legally obligated to pay as a result of a wrongful act — defined as any actual or alleged negligent act, error, or omission committed by an insured in connection with the rendering of professional services. The policy defends the insured even if the claim is ultimately found to be groundless, false, or fraudulent.
ℹ️ Key Insight: Because CGL policies exclude professional services, every accountant — sole practitioner or large firm — who provides any professional advice or services has a coverage gap that only an APL policy can fill. Without APL coverage, a professional liability claim falls entirely on the accountant’s personal or firm assets.
Key Terminology
| Term | Definition |
|---|---|
| Wrongful Act | Any actual or alleged negligent act, error, or omission committed by an insured solely in connection with rendering professional services |
| Professional Services | Accounting, auditing, tax preparation, bookkeeping, financial advisory, management advisory, and other services performed for a fee |
| Loss | Compensatory damages, settlements, and judgments the insured is legally obligated to pay; excludes fines, penalties, taxes, and disgorgement |
| Claim Expenses | Reasonable legal defense fees, court costs, and expert witness fees incurred in defending a covered claim |
| Claims-Made Policy | Coverage triggered when a claim is first made and reported to the insurer during the policy period |
| Retroactive Date | The earliest date from which prior acts are covered; errors before this date are excluded |
| Tail Coverage (ERP) | Extended Reporting Period endorsement that extends the reporting window after policy expiration or cancellation |
| Insured | Named firm + partners, directors, officers, employees, stockholders, contract/leased personnel, and independent contractors |
2.1 Claims-Made vs. Occurrence Policies
📋 Claims-Made Policy (Standard for APL)
- Coverage triggered when claim is first made AND reported to insurer during the policy period
- Work performed years ago is covered if claim is filed now while policy is active
- Subject to a retroactive date
- Coverage stops when policy expires or is cancelled (unless tail is purchased)
- Most common form for professional liability including APL
- Lower initial premiums; increases each year as prior acts exposure grows
📋 Occurrence Policy (Less Common)
- Coverage triggered by the date the wrongful act occurred
- Claims filed after policy expires are still covered if error happened during the policy period
- No tail coverage needed
- Higher and more stable premiums from inception
- Rarely used for APL in the U.S.
- Provides “set and forget” coverage for the period insured
2.2 Retroactive Date — Critical Concept
The retroactive date is the earliest date from which prior professional work is covered. A claim arising from work performed before the retroactive date is not covered, even if the claim is filed during the policy period.
- When first purchasing APL insurance, the retroactive date is typically set to the policy inception date
- As long as you renew with the same insurer, the retroactive date typically does not advance — keeping your full work history covered
- If you switch insurers, the new insurer sets a new retroactive date, creating a prior acts gap
- Some insurers offer “full prior acts” coverage to eliminate the retroactive date entirely
⚠️ Warning: Never switch APL insurers without first negotiating retroactive date coverage. A gap in prior acts coverage can leave years of completed professional work completely uninsured.
2.3 Tail Coverage — Extended Reporting Period (ERP)
Tail coverage extends the window to report claims after a claims-made policy expires or is cancelled. It is critical when:
- An accountant retires or closes their practice
- A firm is dissolved, merged, or acquired
- Coverage is switched to a new insurer
- A practitioner takes a leave of absence
Without tail coverage, professional work completed before policy expiration is completely uninsured from the date the policy ends. Statutes of limitations for professional negligence in the U.S. typically run 2–6 years, and some run longer when fraudulent concealment is alleged.
💡 InsureBlogging Tip: Retiring CPAs should purchase tail coverage of at least 5–7 years. The cost is typically 1.5–2.5x the final annual premium — a one-time payment for permanent prior acts coverage.
2.4 Coverage Example
📊 APL Claim Scenario — Tax Error Resulting in IRS Penalty
| CPA firm files incorrect corporate tax return for client | Jan 2024 |
| IRS audits client and assesses $480,000 penalty + back taxes | Nov 2025 |
| Client sues CPA firm for professional negligence | Feb 2026 |
| CPA firm’s APL policy is active; retroactive date: 2019 | ✅ Covered |
| Legal defense costs paid by insurer | $85,000 |
| Settlement paid by insurer | $310,000 |
| CPA firm pays deductible | $5,000 |
| Total insurer payment | $395,000 |
| Coverage Area | Description | Examples |
|---|---|---|
| Tax Service Errors | Errors, omissions, or negligence in tax preparation and tax advice | Incorrect deduction applied; wrong filing status; missed deadline; incorrect estimated tax guidance |
| Audit Failures | Failure to detect errors, fraud, or material misstatements in audited financial statements | Failed to detect management fraud; unqualified opinion on misstated statements; failure to follow GAAS |
| Financial Statement Preparation | Errors in compiled or reviewed financial statements | Incorrect balance sheet; misclassified revenue; omitted liabilities |
| Bookkeeping and Write-Up Services | Errors in maintaining client books and records | Incorrect journal entries; transposition errors; misposted payments |
| Financial Advice and Consulting | Negligent financial, investment, or management consulting advice | Incorrect cash flow projections; faulty valuation; misleading financial forecast |
| Missed Deadlines | Failure to file tax returns or regulatory filings by required dates | Missed IRS deadline; late SEC filing; late state franchise tax return |
| Payroll Service Errors | Errors in payroll processing or payroll tax filings | Incorrect payroll tax deposits; wrong W-2 amounts; payroll deduction errors |
| Data Breach (Cyber/Privacy) | Privacy breaches from compromised client financial data in accountant’s systems | Ransomware attack exposing client SSNs; phishing compromise; data loss |
| Estate and Trust Accounting | Errors in estate tax returns and trust accounting | Incorrect estate tax valuation; failure to identify exempt assets |
| Regulatory Investigation Defense | Defense costs for regulatory or licensing board investigations (by endorsement) | State board of accountancy investigation; SEC inquiry; IRS preparer investigation |
✅ Defense Costs Coverage: APL policies cover legal defense fees even if the claim is ultimately dismissed or found groundless. Defense costs in professional liability cases routinely reach $50,000–$200,000+ before settlement, regardless of fault.
| Year / Period | Development | Significance |
|---|---|---|
| 1887 | American Institute of Accountants (predecessor to AICPA) founded | Establishes professional standards and ethical framework for U.S. accountants |
| 1933–1934 | Securities Act (1933) and Securities Exchange Act (1934) enacted | Creates auditor liability to third-party investors; dramatically expands CPA legal exposure |
| 1940s–1960s | Professional liability insurance for accountants begins emerging in the U.S. market | Specialty insurers develop policies tailored to accounting profession risk |
| 1968 | Escott v. BarChris Construction Corp. — landmark federal case | Court holds accountants liable to third-party investors; accelerates demand for APL coverage |
| 1977 | AICPA establishes professional liability insurance program with CNA | AICPA-endorsed program now serves 25,000+ U.S. firms |
| 1985–1995 | Savings and Loan crisis; wave of audit failure litigation | Hundreds of millions in CPA liability settlements; APL premiums surge |
| 1995 | Private Securities Litigation Reform Act (PSLRA) enacted | Raises pleading standards for securities fraud; reduces frivolous audit claims |
| 2001–2002 | Enron, WorldCom, Tyco accounting scandals; Arthur Andersen collapse | Biggest crisis in U.S. accounting history; Sarbanes-Oxley Act (2002) enacted; APL market hardens severely |
| 2002 | Sarbanes-Oxley Act; PCAOB created | New audit standards and oversight; CPAs face increased regulatory scrutiny and liability |
| 2008–2010 | Financial crisis; wave of audit and advisory liability claims | CPA firms face claims from clients who suffered investment losses |
| 2015–2026 | Cyber liability, crypto tax, BOI reporting, ESG: expanding scope of CPA services | New claim types emerge; APL policies adapt with cyber, regulatory, and specialty endorsements |
5.1 Standard APL Policy (Claims-Made)
The most common form. Covers all professional accounting services rendered by the firm and its professionals on a claims-made basis. Includes a duty to defend or defense cost reimbursement. Coverage is typically worldwide for claims made in the U.S., its territories, or Canada.
5.2 Small Firm / Solo Practitioner Programs
Streamlined policies designed for sole proprietors and small firms (1–5 professionals). Simplified application, lower minimum premiums ($300–$700/year for bookkeepers; $500–$1,500/year for CPAs). Available from AICPA program (CNA), Hiscox, and specialty insurers.
5.3 Mid-Market and Large Firm Programs
Comprehensive programs for firms with 5–50+ professionals. Include split limits, higher aggregate limits ($3M–$10M+), and specialized coverage for regulatory proceedings, subpoenas, and crisis management.
5.4 Specialty Endorsements
| Endorsement | What It Adds |
|---|---|
| Regulatory Inquiry / Investigation | Defense costs for state board, IRS, SEC, PCAOB investigations of the insured |
| Network & Information Security / Cyber | Breach remediation, notification costs, privacy liability for client data breaches |
| Investment Advisor Coverage | Extends coverage to registered investment advisor (RIA) services |
| Personal Fiduciary Coverage | Covers accountant acting as personal fiduciary (trustee, executor, estate administrator) |
| Subpoena Assistance | Legal fees responding to subpoenas related to professional services |
| Crisis Event / PR Expense | Public relations expenses to manage reputational damage from a covered claim |
| PCAOB Investigation Coverage | Defense costs for PCAOB inquiries |
| BOI Reporting Coverage | Covers services related to Corporate Transparency Act beneficial ownership reporting |
| Insurer | Program / Target Market | Notable Features |
|---|---|---|
| CNA Financial | AICPA Member Insurance Program; 25,000+ U.S. accounting firms | Largest U.S. APL insurer; AICPA-endorsed; covers BOI/CTA services; strong claims handling |
| Travelers | Individual CPAs to large firms | Tailored accountant E&O; cyber liability integration; investment advisor coverage |
| The Hartford | Small to mid-size accounting firms | Simple online quoting; strong small-firm focus; bundled BOP available |
| Hiscox | Solo practitioners and small firms | Highly competitive for small firms; defense costs outside limits option |
| Zurich North America | Mid-to-large accounting firms | Comprehensive coverage; cyber integration; global coverage capability |
| Tokio Marine HCC | All firm sizes | Broad insuring agreement; strong specialty endorsements; PCAOB investigation coverage |
| Liberty Mutual | Mid-size to large firms | Strong risk management resources; broad professional services definition |
| McGowanPro (MGA) | All firm sizes; specialty focus | Deep APL expertise; broad endorsement options; active claims advisory |
| Exclusion | Description | Notes / Exceptions |
|---|---|---|
| Fraud / Intentional Acts | Claims arising from intentional dishonest, fraudulent, or criminal acts of any insured | Defense may still be covered until fraud is established by judgment or admission; applies separately to each insured |
| Criminal Acts / Fines / Penalties | Criminal fines, penalties, taxes, or sanctions | Does not affect coverage for other damages arising from the same claim |
| Bodily Injury / Property Damage | Claims for physical injury to persons or damage to tangible property | Covered by CGL policy; APL covers only financial/professional harm |
| Employment-Related Claims | Wrongful termination, discrimination, harassment, failure to promote | Covered by EPLI, not APL |
| Employee Benefit Plan Administration | Claims from administering or failing to administer employee benefit plans | Exception: accounting services performed for a plan on behalf of a client are typically covered |
| Non-Accounting Professional Services | Services performed as lawyer, architect, engineer, insurance agent/broker, securities broker-dealer | Each profession needs its own professional liability policy |
| Breach of Contract (sole basis) | Claims based solely on breach of contract | Does not exclude negligence claims related to a contract for services |
| Disgorgement / Fee Return | Return or disgorgement of fees, profits, or commissions paid to the insured | Not a covered “loss” |
| Insured vs. Insured | Claims by one insured against another insured | Prevents firm partners from suing each other under the policy |
⚠️ Fraud Exclusion in Practice: APL policies exclude claims for intentional fraud but typically cover negligent accounting errors even when a client alleges fraud. The insurer will defend the claim until a final judgment or admission establishes intentional fraud.
| Firm Size / Type | Annual Revenue | Coverage Limit | Typical Annual Premium |
|---|---|---|---|
| Solo bookkeeper | Under $100K | $500K–$1M per claim | $300–$700/year |
| Solo CPA / tax preparer | Under $400K | $1M per claim / $1M aggregate | $500–$1,500/year |
| Small firm (2–3 professionals) | $400K–$800K | $1M per claim / $2M aggregate | $1,200–$2,500/year |
| Small firm (4–5 professionals) | $800K–$1.5M | $1M per claim / $3M aggregate | $2,000–$4,000/year |
| Mid-size firm (6–20 professionals) | $1.5M–$5M | $2M per claim / $5M aggregate | $5,000–$10,000+/year |
| Large regional firm (20+ professionals) | $5M+ | $5M–$10M+ per claim | $15,000–$50,000+/year |
Premium Rating Factors
- Firm revenue and size — Primary rating factor
- Services rendered — Audit services carry significantly higher premiums than tax or bookkeeping
- Client industries — High-risk industries (financial services, real estate, startups) increase premium
- Claims history — Prior claims dramatically increase premium
- Coverage limits and deductible — Higher limits = higher premium; higher deductible = lower premium
- Retroactive date — Longer prior acts history = higher premium
- Geographic location — Firms in CA, NY, FL, TX face 20–25% above national average premiums
✅ Claims-Made Step-Up: New APL policyholders benefit from a step-up structure where premiums increase each year as prior acts exposure accumulates. A 5-year step-up policy typically saves $1,500–$2,000+ vs. a flat-rate policy while providing equivalent coverage.
- Report immediately — do not delay. APL policies require claims to be made and reported to the insurer during the policy period. Late reporting is one of the most common reasons for claim denial. Report any demand letter, lawsuit, or formal complaint as soon as received.
- Report “circumstances” proactively. Most APL policies allow you to report a “circumstance” — a situation you know could give rise to a claim — even before a formal claim is filed. This “locks in” the current policy period for any subsequent claim arising from that circumstance.
- Contact your insurer or broker in writing. Provide the client name, a description of the alleged error, the nature of the potential claim, and all relevant facts known at the time.
- Preserve all relevant documentation:
- All engagement letters and service contracts
- Work papers, workfiles, and client records related to the services at issue
- All communications (email, text, written) with the client
- Time records, billings, and payment records
- Drafts of any financial statements, tax returns, or reports at issue
- Do not communicate with the claimant about the claim. Once a claim is identified, do not make any admissions, apologies, or settlement offers. Direct all claim-related communication through your insurer and defense counsel.
- Cooperate fully with the insurer. APL policies require good-faith cooperation. Failure to cooperate can void coverage.
- Use pre-claim assistance. Many APL insurers offer free attorney consultation before a claim is formally filed. Use this resource proactively when you identify a potential problem.
💡 Critical: The most common reason for APL coverage denial is failing to report a claim or circumstance before the policy expires or is cancelled. Set calendar reminders well before your policy expiration date.
| Claim Type | Frequency | Severity | Examples |
|---|---|---|---|
| Tax Service Errors | ⭐⭐⭐⭐⭐ Highest | ⭐⭐⭐ Moderate | Incorrect deductions; wrong filing status; missed deadlines; payroll tax errors |
| Audit Failures | ⭐⭐⭐ Moderate | ⭐⭐⭐⭐⭐ Highest | Failed to detect management fraud; unqualified opinion on misstated financials; GAAS violations |
| Financial Statement Preparation | ⭐⭐⭐⭐ High | ⭐⭐⭐ Moderate | Errors in compiled statements; failure to disclose contingencies; misclassification |
| Advisory / Consulting Errors | ⭐⭐⭐ Moderate | ⭐⭐⭐⭐ High | Incorrect financial projections; faulty valuation; inadequate estate planning advice |
| Missed Regulatory Deadlines | ⭐⭐⭐⭐ High | ⭐⭐ Lower | Missed extension deadlines; late S-corp elections; untimely 1031 exchange identification |
| Failure to Detect Employee Fraud | ⭐⭐ Lower | ⭐⭐⭐⭐⭐ Highest | Client embezzlement not detected during bookkeeping review; internal controls deficiency |
| Cybersecurity / Data Breach | ⭐⭐⭐ Growing | ⭐⭐⭐ Moderate-High | Client SSNs and tax data exposed in ransomware attack; phishing compromise; unencrypted data loss |
| Bookkeeping Errors | ⭐⭐⭐⭐ High | ⭐⭐ Lower | Transposition errors; misposted cash receipts; reconciliation failures |
📊 2026 Trend Alert: COVID-19 era claims are resurging as primary limitation periods expire from 2026. Insolvency-related audit claims are rising. Cyber claims are the fastest-growing new claim category. (Source: Kennedys Law Professional Liability Market Insights, 2025)
| Metric | Data | Source |
|---|---|---|
| Annual professional liability incidents (accountants + consultants, U.S.) | 110,000+ | Market Reports World |
| Global CPA liability insurance market size (2025) | ~$4.185 Billion | Cognitive Market Research |
| % of claims related to auditing services | 30%+ | Kennedys Law 2025 |
| % large U.S. accounting firms (50+ employees) with APL coverage | ~65% | LinkedIn Industry Report 2026 |
| Metro areas with higher APL adoption (NYC, Chicago, LA) | 20–25% above national average | LinkedIn Industry Report 2026 |
| U.S. accounting firms in AICPA CNA program | 25,000+ | AICPA / Journal of Accountancy 2024 |
| Median monthly cost for accounting firm E&O | Under $35/month | PIA Insurance Agency 2025 |
| Small firm 5-year step-up savings vs. flat-rate | ~$1,800–$2,000 | PIA Insurance Agency 2025 |
12.1 State Insurance Department Regulation
APL policies are insurance contracts regulated by each state’s department of insurance. Policy forms and rates must be filed and approved. Claims handling is subject to state unfair claims settlement practice laws.
12.2 State Boards of Accountancy
Each state’s Board of Accountancy licenses CPAs and enforces professional conduct standards. Several states have adopted requirements that firms maintain minimum professional liability insurance as a condition of firm registration or license renewal. The AICPA and state CPA societies strongly encourage all practitioners to maintain APL coverage.
12.3 AICPA Standards and Ethics
The AICPA Code of Professional Conduct establishes ethical standards defining the duty of care CPAs owe clients. Violation of AICPA standards is frequently cited as evidence of negligence in APL claims. The AICPA’s Professional Liability Insurance Program (underwritten by CNA) serves over 25,000 U.S. accounting firms.
12.4 PCAOB
For CPAs who audit public companies, the PCAOB establishes audit standards and investigates auditor conduct. A PCAOB investigation or disciplinary proceeding can trigger regulatory inquiry coverage under specialized APL endorsements.
ℹ️ BOI Reporting (CTA) & APL Coverage: The AICPA and CNA confirmed in 2024 that CNA’s APL policies generally cover BOI work performed prior to any determination that it constitutes unauthorized practice of law. (Source: AICPA / Journal of Accountancy, Feb 2024)
✅ Definitely Needs APL Coverage
- Licensed CPAs (all practice sizes)
- Enrolled agents providing tax services
- Bookkeepers and accounting consultants
- Tax preparers (paid preparers of any client size)
- Accounting firms with any employees
- CPAs providing audit services
- CPAs providing investment advisory or financial planning services
- Accountants acting as trustees, executors, or personal fiduciaries
- Forensic accountants and litigation support specialists
💡 Also Strongly Recommended For
- Retired CPAs (tail coverage for prior work)
- CPAs transitioning between firms
- CPAs serving high-net-worth or corporate clients
- Firms expanding into crypto tax, BOI, ESG services
- CPAs required by client contract to maintain minimum coverage
- Accountants on firm acquisition / merger: ensure prior acts coverage
ℹ️ The “Even Good CPAs Get Sued” Reality: A significant percentage of APL claims are filed against CPAs who performed their work correctly. Client expectations vs. actual results, economic loss, or a client’s financial difficulties can all trigger claims regardless of the CPA’s actual performance. Defense costs alone — routinely $50,000–$200,000+ — make APL insurance essential for all practitioners.
- Use engagement letters for every client and every service. A well-drafted engagement letter defining scope, responsibilities, deadlines, and limitations is the single most effective liability-reduction tool.
- Document, document, document. Maintain thorough work papers and document all significant client communications, advice given, and decisions made.
- Maintain continuity of APL coverage without gaps. Never allow your APL policy to lapse. Set auto-renewal reminders well in advance of expiration.
- Do not switch insurers without protecting prior acts. If changing APL insurers, secure prior acts coverage from the new insurer, or purchase tail coverage from the outgoing insurer.
- Report circumstances proactively before policy renewal. Review all client engagements before renewing your APL policy. Report any engagement with a quality issue as a “circumstance” under your current policy.
- Screen clients carefully. Clients with prior accountant disputes, unreasonable expectations, financial distress, or complex structures represent elevated liability risk.
- Implement quality control procedures. Follow AICPA quality control standards. Second-partner review, peer review participation, and continuing education reduce both claim frequency and insurer premium surcharges.
- Use pre-claim assistance. Many APL insurers provide free attorney consultation before a claim is filed. Use this benefit at the first sign of client dissatisfaction.
- Review cybersecurity protocols annually. Client financial data is a prime ransomware target. Annual security reviews reduce both breach risk and claims.
✅ InsureBlogging Risk Management Checklist for CPAs:
✔ Engagement letter for every service · ✔ Complete work papers · ✔ APL policy active with no retroactive date gap · ✔ Circumstances reported before renewal · ✔ Client screening procedures · ✔ Quality control / peer review · ✔ Cyber security protocols · ✔ Tail coverage plan for retirement / firm dissolution
✔ Engagement letter for every service · ✔ Complete work papers · ✔ APL policy active with no retroactive date gap · ✔ Circumstances reported before renewal · ✔ Client screening procedures · ✔ Quality control / peer review · ✔ Cyber security protocols · ✔ Tail coverage plan for retirement / firm dissolution
Accountants Professional Liability (APL) insurance — also called CPA E&O or accountants malpractice insurance — is a specialized professional liability policy that protects CPAs, accountants, and accounting firms from claims alleging financial loss caused by professional errors, omissions, or negligence in accounting services. It covers legal defense costs, settlements, and judgments. Standard CGL policies exclude professional services, making APL insurance essential for all accounting professionals.
APL insurance covers legal defense costs and settlements for claims of professional negligence, errors in tax preparation, audit failures, bookkeeping errors, missed deadlines, incorrect financial advice, data breaches involving client financial data, and other professional errors in accounting services. Defense costs are covered even for groundless or dismissed claims — which often reach $50,000–$200,000+ before resolution.
APL insurance is not mandated by law in most states, but some state accountancy boards require proof of coverage for firm registration or license renewal. The AICPA strongly recommends it for all practitioners. Many clients — particularly corporate clients, banks, and government entities — require CPAs to maintain minimum APL coverage as a condition of engagement.
A claims-made policy covers claims filed and reported while the policy is active (subject to a retroactive date). This is the standard form for APL insurance. An occurrence policy covers events that happened during the policy period, even if the claim is filed after expiration. Occurrence APL policies are rare in the U.S., making tail coverage essential upon retirement or policy cancellation.
Tail coverage (Extended Reporting Period endorsement) extends the window to report claims after a claims-made APL policy expires or is cancelled. It is essential when a CPA retires, closes their practice, switches insurers, or a firm is dissolved or acquired. Without tail coverage, all prior professional work becomes uninsured from the policy expiration date. Retiring CPAs should purchase at least 5–7 years of tail coverage.
Premiums start at $300–$700/year for solo bookkeepers, $500–$1,500/year for solo CPAs ($1M coverage), and $1,200–$2,500/year for small firms. Mid-size firms (10+ professionals) typically pay $5,000–$10,000+/year. The median monthly cost for accounting businesses is under $35/month. Key factors: firm revenue, services provided (audit vs. tax vs. bookkeeping), client industries, claims history, and location.
The AICPA Member Insurance Program is an AICPA-endorsed accountants professional liability insurance program underwritten by CNA Financial Corporation. It serves more than 25,000 U.S. accounting firms. The program includes comprehensive APL coverage, BOI/CTA reporting coverage, cyber liability endorsements, regulatory inquiry defense, and competitive pricing for AICPA members. Aon serves as the risk advisor for the program.
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