---
title: "USI Insurance Services vs Vouch Professional Liability (E&O) Insurance"
description: "USI's flagship E&O program is CPA-specific and underwritten by CNA; Vouch places E&O for a different mix of professional-services segments."
canonical: "https://spot.insure/compare/usi-vs-vouch/professional-errors-omissions"
page-type: "line-comparison"
updated-at: "2026-09-23"
---

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# USI Insurance Services vs Vouch Professional Liability (E&O) Insurance

USI's flagship E&O program is CPA-specific and underwritten by CNA; Vouch places E&O for a different mix of professional-services segments.

## Research Scope and Use

Use this comparison to evaluate USI Insurance Services and Vouch for Professional Liability (E&O) Insurance against the same documented criteria. It identifies differences and questions to confirm; it does not select a winner for a particular business. Offering claims are what each provider publishes about this line unless marked otherwise. “Not found” describes the evidence reviewed, not proof that a feature is unavailable. Confirm the insurer, policy wording, limits, retentions, exclusions and cost in an actual quote.

## Summary

USI's most detailed E&O offering is the AICPA Professional Liability Program, a CPA-specific plan underwritten by CNA, while Vouch places E&O for accounting and finance, architecture and engineering, IT consulting, and marketing agencies through its program partner Corix. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") [11](https://www.vouch.us/professional-services "Insurance for Professional Services Firms")

## What Is USI Insurance Services?

USI Insurance Services is a U.S. insurance brokerage and consulting firm that arranges property and casualty, employee benefits, personal risk, and retirement programs. Its Technology practice says it works with software, hardware, and related companies from early seed stage through IPO, using a consultative process rather than a published self-serve quote. [1](https://www.usi.com/about-usi "The Power of ONE") [2](https://www.usi.com/property-casualty/technology/ "Technology Insurance") [3](https://www.usi.com/commissions-fees/ "Commissions and Fees")

[USI Insurance Services profile](https://spot.insure/insurance-providers/usi)

## What Is Vouch Insurance?

Vouch is a business insurance broker and risk advisor for startups and growing companies. Buyers can apply online and work with advisors to arrange coverage, review contract requirements and manage insurance across carriers. [7](https://www.vouch.us/ "Vouch Homepage") [8](https://apply.vouch.us/ "Start a Vouch Application") [9](https://www.vouch.us/blog/how-having-carrier-options-in-one-place-helps-businesses-choose-smarter-coverage "Carrier Options in One Place") [10](https://www.vouch.us/services/contract-requirement-review "Contract Requirement Review")

[Vouch profile](https://spot.insure/insurance-providers/vouch)

## What Is Professional Errors and Omissions (E&O) Insurance?

Professional errors and omissions (E&O) insurance, also called professional liability insurance, addresses claims that professional services or advice caused a client financial loss. What's covered depends on the services actually scheduled in the policy, not the product label alone. [14](https://www.tdi.texas.gov/commercial/pl-faq.html "FAQ: Professional liability insurance") [15](https://www.iii.org/article/professional-liability-insurance "Professional liability insurance") [16](https://www.sba.gov/counseling/launch-your-business/#business-insurance "Get business insurance") [17](https://www.hiscox.com/documents/pl-sample-policy-wording.pdf "Professional Liability – US Direct Errors and Omissions Insurance")

## Key Differences in Professional Liability (E&O) Insurance

### Two Broker-Side Structures, Different Named Insurers

USI is the endorsed producer of the AICPA Professional Liability Program through its USI Affinity division, and its page names an insurer directly for that program:

USI's own page states that the AICPA Professional Liability Program is "underwritten by CNA," naming the carrier for that specific program. USI's general Business Services E&O placements do not name an insurer. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Direct quote from the AICPA program page; CNA underwrites only this named program, not USI's other professional-liability placements..)

Vouch is a broker for E&O as well, placing coverage through named program partners including Corix, whose disclosures name State National Insurance Company or United Specialty Insurance Company as the E&O issuer. [13](https://www.corixinsurance.com/legal/disclosures "Legal Disclosures")

### Who Each Company Targets

USI's AICPA program targets sole practitioners and regional CPA firms specifically, a role it has held since 1994, with general Business Services E&O available separately for other business types. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") Vouch markets its professional E&O to accounting and finance, architecture, engineering and construction, IT consulting, management consulting, and marketing and creative agency firms. [11](https://www.vouch.us/professional-services "Insurance for Professional Services Firms")

### Services Included

USI says AICPA program firms get supportive claims handling and exclusive access to risk-management resources, including engagement-letter templates, in addition to the coverage itself. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") Vouch's reviewed pages describe Corix's application and appointment process for E&O but do not detail comparable risk-management resources bundled with the policy. [12](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions")

## What to Confirm in Professional Liability (E&O) Insurance Quotes

- If you're a CPA firm, ask USI whether the AICPA program or its general Business Services E&O placement applies. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity")
- Ask Vouch whether your placement would go through Corix or another program partner, since the named insurers apply to Corix-branded E&O specifically. [13](https://www.corixinsurance.com/legal/disclosures "Legal Disclosures")
- Neither company's reviewed page publishes limits or retentions; ask both for specific figures. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") [11](https://www.vouch.us/professional-services "Insurance for Professional Services Firms")
- Ask USI what risk-management resources come bundled with the AICPA program specifically, since general Business Services placements may differ. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity")

## Offering Details

| Criteria | AICPA Professional Liability Program (USI Affinity) | Vouch Errors & Omissions Insurance |
| --- | --- | --- |
| Role in This Line | For CPA firms, USI runs the AICPA Professional Liability Program through its USI Affinity division as the endorsed producer, rather than underwriting the policy itself. USI's general Business Services practice separately brokers errors and omissions/professional liability coverage for other business types. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") [6](https://www.usi.com/property-casualty/business-services/ "Business Services") (Evidence: Company-reported; scope: AICPA program page and Business Services practice page..) | Vouch is a broker, not an insurer, for professional errors & omissions coverage. It lists Errors & Omissions among the core coverages it places for professional-services clients, and one of its named program partners, Corix, has a dedicated E&O product. [11](https://www.vouch.us/professional-services "Insurance for Professional Services Firms") [12](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions") (Evidence: Company-reported; scope: Vouch's Professional Services page and Corix's cyber/E&O product page..) |
| Issuing Insurer | USI's own page states that the AICPA Professional Liability Program is "underwritten by CNA," naming the carrier for that specific program. USI's general Business Services E&O placements do not name an insurer. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Direct quote from the AICPA program page; CNA underwrites only this named program, not USI's other professional-liability placements..) | Corix's disclosures say its proprietary products, including its E&O line, are issued by State National Insurance Company or United Specialty Insurance Company. That names an insurer for Corix-branded E&O products specifically, not for every Vouch professional-liability placement. [13](https://www.corixinsurance.com/legal/disclosures "Legal Disclosures") (Evidence: Company-reported; scope: Corix disclosures page..) |
| Who It’s For | USI markets the AICPA program to sole practitioners and regional CPA firms. It has offered CPA coverage since 1967 and has been the endorsed AICPA Program provider since 1994. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Program page description..) | Vouch markets professional E&O to accounting and finance, architecture/engineering/construction, IT consulting, management consulting, and marketing and creative agency firms. [11](https://www.vouch.us/professional-services "Insurance for Professional Services Firms") (Evidence: Company-reported; scope: Vouch's Professional Services page; not an underwriting appetite guarantee for any specific applicant..) |
| Coverage Features | USI describes the policy as insuring a CPA and their practice against third-party claims that professional services caused financial harm, providing a defense and paying damages for covered claims arising from high-risk situations tied to new clients, changing business plans, or new laws and regulations. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Program page description; actual insuring agreements, exclusions and conditions are set by the issued CNA policy form..) | Corix describes E&O as protecting a business against claims of negligence, mistakes or inadequate work that cause a client financial loss in the provision of professional services, including legal defense costs and any damages awarded, even when the claim is ultimately groundless. [12](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions") (Evidence: Company-reported; scope: Corix's cyber and E&O product page; actual insuring agreements and exclusions are set by the issued policy..) |
| Limits and Retentions | The AICPA program page does not publish limit, retention or premium figures; it says coverage plans allow a firm to tailor coverage to its risk profile. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Not publicly disclosed; scope: Page as read on 2026-09-23..) | Neither the Vouch nor Corix pages publish E&O policy limits or retentions. [11](https://www.vouch.us/professional-services "Insurance for Professional Services Firms") [12](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions") (Evidence: Not publicly disclosed; scope: Pages checked on 2026-09-23..) |
| Risk Services | USI says firms enrolled in the program get supportive claims handling and exclusive access to risk-management resources, including engagement-letter templates, in addition to the coverage itself. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Program page description..) | Not described in the reviewed sources. |
| How to Apply | USI directs CPA firms seeking a quote or renewal to contact USI Affinity, with a dedicated Affinity_APL@usi.com address for the AICPA program specifically. [4](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Contact instructions on the AICPA program page..) | Corix's E&O product page offers a downloadable application and directs brokers to start an appointment process; Vouch's own site routes prospective buyers to its online "Get Started" application flow. [12](https://www.corixinsurance.com/products/cyber-and-errors-omissions "Cyber and Errors & Omissions") [11](https://www.vouch.us/professional-services "Insurance for Professional Services Firms") (Evidence: Company-reported; scope: Corix product page and Vouch site navigation..) |

## Full Comparison

- [USI Insurance Services vs Vouch](https://spot.insure/compare/usi-vs-vouch): all coverage lines, business roles, service and claims.
- [What Is Professional Errors and Omissions (E&O) Insurance?](https://spot.insure/coverage/professional-errors-omissions): Professional E&O insurance addresses claims that a mistake in your advice or services caused a client financial loss.
- [USI Insurance Services vs Vouch Commercial Property Insurance](https://spot.insure/compare/usi-vs-vouch/commercial-property)
- [USI Insurance Services vs Vouch Cyber Insurance](https://spot.insure/compare/usi-vs-vouch/cyber)
- [USI Insurance Services vs Vouch D&O Insurance](https://spot.insure/compare/usi-vs-vouch/directors-officers)
- [USI Insurance Services vs Vouch Medical Malpractice Insurance](https://spot.insure/compare/usi-vs-vouch/medical-malpractice)
- [Alliance Risk vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-usi/professional-errors-omissions)
- [Alliance Risk vs Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-vouch/professional-errors-omissions)
- [At-Bay vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-usi/professional-errors-omissions)
- [At-Bay vs Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-vouch/professional-errors-omissions)
- [Beazley vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/beazley-vs-usi/professional-errors-omissions)
- [Beazley vs Vouch Professional Liability (E&O) Insurance](https://spot.insure/compare/beazley-vs-vouch/professional-errors-omissions)

## Sources

### USI Insurance Services

1. [The Power of ONE](https://www.usi.com/about-usi). USI Insurance Services; History, client-count, nationwide office, and P&C / benefits / personal risk / retirement description. Accessed 2026-09-16.
2. [Technology Insurance](https://www.usi.com/property-casualty/technology/). USI Insurance Services; Technology practice client types, seed-to-IPO range, and listed insurance placement lines including PrivaSafe. Accessed 2026-09-16.
3. [Commissions and Fees](https://www.usi.com/commissions-fees/). USI Insurance Services; Licensed-producer authority, insurer-paid commission default, contingent compensation, and client request right. Accessed 2026-09-16.
4. [Accountants Professional Liability — USI Affinity](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/). USI Insurance Services; Quality Professional Liability Insurance Exclusively for CPA Firms; "The AICPA Professional Liability Program, underwritten by CNA, has been offering coverage to CPAs since 1967 and has been the endorsed provider of the AICPA Program since 1994."; supportive claims handling and exclusive access to extensive risk management resources, including engagement letter templates; Email Affinity_APL@usi.com. Accessed 2026-09-23.
5. [USI Specialty Program Solutions](https://www.usi.com/programs/). USI Insurance Services; USI Affinity delivers high-quality insurance and financial solutions to members of affinity organizations and targeted industry segments...for professional associations, law firms, alumni and collegiate organizations, travel groups, and insurance administrators.. Accessed 2026-09-23.
6. [Business Services](https://www.usi.com/property-casualty/business-services/). USI Insurance Services; USI advises clients...and provides solutions for...Errors & Omissions/Professional Liability.... Accessed 2026-09-23.

### Vouch

7. [Vouch Homepage](https://www.vouch.us/). Vouch; Hero identifying Vouch as an insurance broker; Industries; Services; footer identifying Vouch Specialty and qualifying product availability. Accessed 2026-09-15.
8. [Start a Vouch Application](https://apply.vouch.us/). Vouch; Public first screen: legal business name, website/no-website option, address and location type, applicant role and contact fields, consent, and existing-customer sign-in. Accessed 2026-09-15.
9. [Carrier Options in One Place](https://www.vouch.us/blog/how-having-carrier-options-in-one-place-helps-businesses-choose-smarter-coverage). Vouch; 26 November 2025: Choice Without the Chaos; Clarity That Builds Confidence; One Relationship, Many Solutions; final producer/underwriting disclosure. Accessed 2026-09-15.
10. [Contract Requirement Review](https://www.vouch.us/services/contract-requirement-review). Vouch; Coverage that keeps your deals moving; Tailored to your contract; Effortless Experience (reviews and COIs). Accessed 2026-09-15.
11. [Insurance for Professional Services Firms](https://www.vouch.us/professional-services). Vouch; Expertise across professional services: Accounting & Finance, Architecture/Engineering/Construction, IT Consulting, Management Consulting, Marketing & Creative Agencies; Core coverages for Professional Services: Errors & Omissions, General Liability, Cyber Liability, Employment Practices Liability, Workers' Compensation. Accessed 2026-09-23.
12. [Cyber and Errors & Omissions](https://www.corixinsurance.com/products/cyber-and-errors-omissions). Corix Insurance; Errors & Omissions insurance provided by Corix helps protect businesses for claims of negligence, mistakes, or inadequate work that causes a financial loss to clients, in the provision of professional services. It includes legal defense costs and damages awarded, even when the claim is groundless.. Accessed 2026-09-23.
13. [Legal Disclosures](https://www.corixinsurance.com/legal/disclosures). Corix Insurance; Policies are issued by State National Insurance Company (NAIC# 12831) or United Specialty Insurance Company (NAIC#12537).. Accessed 2026-09-23.

### Professional Liability (E&O) Insurance Guide

14. [FAQ: Professional liability insurance](https://www.tdi.texas.gov/commercial/pl-faq.html). Texas Department of Insurance; What’s professional liability coverage?; What types of damages…; What’s general liability insurance?; Do I need professional liability… if I have general liability…?; Is professional liability insurance required?; Can a client require…?; What’s the difference between occurrence policies and claims-made policies. Accessed 2026-09-16.
15. [Professional liability insurance](https://www.iii.org/article/professional-liability-insurance). Insurance Information Institute; Opening paragraphs (professional services/advice and E&O name); Claims not covered by general liability; What types of businesses need professional liability insurance?; What’s covered… and what’s not (claims-made versus occurrence, defense and judgments, non-financial/intentional limits, BOP/in-home exclusion). Accessed 2026-09-16.
16. [Get business insurance](https://www.sba.gov/counseling/launch-your-business/#business-insurance). U.S. Small Business Administration; Six common types of business insurance table. Accessed 2026-09-16.
17. [Professional Liability – US Direct Errors and Omissions Insurance](https://www.hiscox.com/documents/pl-sample-policy-wording.pdf). Hiscox Inc. specimen; About this Policy / Coverage for Claims Made Against You; I.A Insuring Agreement; I.B Defense; I.C Settlement; II.A Notice of Claims; II.C Optional Extended Reporting Period; III.A, III.K, III.M, III.R, III.S Exclusions; IV.A–B Limits and Deductible; VI.O Professional Services; VI.U Wrongful Act. Accessed 2026-09-16.

Updated 2026-09-23. Spot, a product of Tools for Enlightenment, publishes this research and works in the commercial insurance market. The comparison applies the same criteria to both providers. [Editorial policy](https://spot.insure/editorial-policy). To suggest a correction, [contact Spot](https://spot.insure/contact) with the page URL and supporting source.

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