Short Answer
Most architects and engineers carry professional liability on a claims-made basis. An extended reporting period gives you additional time to report claims after the policy ends, subject to the policy's terms. It matters most when a firm closes, sells, retires, merges, or changes carriers. Available durations and pricing depend on the carrier and form, so check your own policy before making decisions.
How claims-made coverage works
A claims-made policy generally responds when a claim is first made against the firm and reported to the carrier during the policy period. The work itself may have been done years earlier. Once the policy ends, a claim made afterward usually falls outside it, even if the project was completed while the policy was active.
What a retroactive date does
Most claims-made policies include a retroactive date. Work performed before that date is generally not covered, even if the claim arrives during the policy period. Keeping the same retroactive date when you renew or change carriers helps preserve coverage for past work. Whether a new carrier will match it depends on underwriting.
Why completed projects can create claims years later
Design errors often surface long after a project is finished. A structural or waterproofing issue may not appear until the building has been occupied for years. Statutes of repose and limitation periods vary by state, so a firm can face a claim well after it stops working on a project.
What an extended reporting period does
An extended reporting period, often called tail coverage, extends the window for reporting claims after the policy ends. It typically applies to claims arising from work performed before the policy ended and on or after the retroactive date. It does not usually restart coverage for new work.
What an extended reporting period does not do
An ERP generally does not cover work performed after the policy ends. It does not usually reinstate limits, so the aggregate limit may be shared with the expired policy. It also does not cover claims already excluded under the original policy. The exact terms depend on the endorsement wording.
One-year, multi-year, and other options
Some forms offer a one-year option, while others offer multiple years or an unlimited duration. Other carriers price these as a percentage of the expiring annual premium, and the percentages vary. While other options must be requested within a set window after the policy ends. Because schedules differ by carrier and form, no single schedule applies to every policy. Read the extended reporting provisions in your own policy to see what is offered.
Why pricing varies by carrier
Carriers set ERP pricing based on their own underwriting view of the exposure that remains after coverage ends. The discipline, project types, claims history, and firm size can all affect the cost. Two carriers may quote very different prices for the same firm, so it helps to confirm pricing and deadlines before the policy ends.
When firms need to understand their tail options
Several situations make this especially important:
- Closing the firm or retiring
- Selling the firm or merging with another
- Switching carriers without matching the retroactive date
- Moving to a policy with a different form
In each case, the firm should confirm how prior work will be covered after the change.
Example
A civil engineering firm carries claims-made coverage with a retroactive date from ten years ago. The owner retires and closes the firm, and the policy is not renewed. Three years later, a property owner alleges a drainage design problem on a project the firm completed five years earlier.
Without an extended reporting period, the claim would arrive after the policy ended and may not be covered. If the firm had purchased an ERP that runs long enough, the claim could be reported under it, subject to the endorsement's terms. Whether coverage applies depends on the policy language and the facts of the claim.
What to check in your own policy
- Find the extended reporting period provision, often in the conditions section or an endorsement
- Confirm which durations are offered and how each is priced
- Check the deadline for requesting the ERP after the policy ends
- Review your retroactive date and whether it would carry over to a new policy
- Ask whether the ERP limit is separate or shared with the expiring policy
Related Questions
What is tail coverage in professional liability insurance?
Tail coverage is another term for an extended reporting period. It gives you additional time to report claims after a claims-made policy ends.
Is an extended reporting period the same as an occurrence policy?
No. An occurrence policy responds based on when the event happened. An ERP extends the reporting window on a claims-made policy.
Do I need a tail if I switch carriers?
Not always. If the new carrier matches your retroactive date, prior work may stay covered. Confirm this with your broker before the old policy ends.
How much does an extended reporting period cost?
It varies by carrier and form, and often depends on the expiring premium and the duration chosen. Ask for a written quote before the policy ends.
Can I buy an extended reporting period after the policy expires?
Some forms require you to elect it within a specific window. Check your policy for the deadline.
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Author:
Hardcover Editorial Team
Reviewed by:
Hardcover Insurance Team
Last reviewed:
September 28, 2026
This article is educational and does not provide legal advice or determine whether a specific claim is covered. Policy terms, exclusions, underwriting requirements, and applicable law vary. Consult your insurance professional and qualified legal counsel regarding your circumstances.