Professional liability insurance, sometimes called errors and omissions coverage, protects a business against claims arising from mistakes or negligence in delivering professional services. The structure of most policies, however, creates a coverage mechanic that depends heavily on documentation most business owners never think to connect to their insurance at all.

Key Takeaway

Most professional liability policies are written on a "claims-made" basis, meaning coverage depends on when a claim is reported, not when the underlying error occurred, and on a retroactive date that can leave older work uncovered if a policy lapses or changes. Proper financial records supporting the timeline of services delivered are frequently what a claim, and a claims adjuster, actually depend on.

Claims-Made Versus Occurrence Coverage

An occurrence policy covers an incident that happened during the policy period, regardless of when the resulting claim is actually made, even years later. A claims-made policy, the more common structure for professional liability coverage, only covers a claim that is both made and reported while the policy is active, meaning the timing of when a claim surfaces matters as much as when the underlying error occurred.

The Retroactive Date Problem

Claims-made policies include a retroactive date, generally the date coverage first began with that insurer, and claims arising from work performed before that date are typically not covered even under an active current policy. Switching insurers without specifically negotiating continuity of the original retroactive date, or allowing a policy to lapse even briefly, can create a genuine gap where work performed in a prior period has no coverage at all under any current policy.

What Records A Claim Actually Needs

When a professional liability claim arises, establishing exactly when specific services were delivered, and under which policy period that work falls, depends directly on the business's own records, invoices, engagement letters, project timelines, and correspondence. A business with disorganized or incomplete records may struggle to establish that a claim relates to work covered under its current policy, precisely the kind of documentation gap that can turn an otherwise valid claim into a coverage dispute.

The Coverage Gap At The Time Of A Business Sale

Selling a professional services business creates a specific version of this problem: claims-made coverage generally needs to continue, often through a specific "tail" policy, to cover work performed before the sale even after the seller is no longer operating the business day to day. Without this tail coverage properly arranged as part of the sale, a claim arising after closing for work performed before it can find no policy actually in force to respond, a gap worth addressing explicitly in the sale agreement itself.

A Practical Annual Review

An annual review pairing the professional liability policy renewal with a check of the business's own documentation practices, confirming engagement letters and project records clearly establish service delivery dates, and confirming the policy's retroactive date has not inadvertently reset through a change in insurer, closes the most common gaps before they matter. This is a genuinely useful joint conversation between a business's insurance broker and its bookkeeper or accountant, rather than two entirely separate relationships that never actually compare notes.

Frequently Asked Questions

What's the difference between claims-made and occurrence coverage?
Occurrence coverage responds based on when the underlying incident happened, regardless of when a claim is made. Claims-made coverage responds only if the claim is made and reported while the policy is active, making the timing of the claim itself critical.
What happens if I switch insurers for professional liability coverage?
Without specifically negotiating continuity of your original retroactive date, switching insurers can create a gap where work performed before the new policy's retroactive date is not covered under either the old or new policy.
Do I need special coverage when selling a professional services business?
Often yes, a tail policy extending claims-made coverage for work performed before the sale is frequently needed, since claims for pre-sale work can still arise after the business has changed hands.
How do my bookkeeping records actually relate to an insurance claim?
Records establishing exactly when specific services were delivered are often what determines whether a claim falls within a covered policy period, disorganized records can create genuine difficulty establishing this during an actual claim.
IB

About The Insight Bureau Research Desk

The Insight Bureau is GSH Financial's research publication, written by our fractional CFO practice for Canadian professional services business owners. This article reflects general claims-made professional liability insurance principles current as of publication; see References below.

References

  1. Insurance Bureau of Canada. (2025). Professional liability insurance, claims-made coverage explained. ibc.ca
  2. CPA Canada. (2025). Documentation practices supporting professional liability claims. cpacanada.ca

This article is provided for general informational purposes and is not insurance or legal advice. Professional liability policy terms vary significantly by insurer and profession, review your specific policy with a licensed insurance broker.