Bernard Achebe Skipped an $18,400 Tail Endorsement in 2024. A 2019 Report Followed Him Home.

9 min read · Last updated September 18, 2026

Tail coverage, or an Extended Reporting Period, is a one-time endorsement that keeps a claims-made policy accepting claims on old work after the policy itself has ended, and it commonly costs 100% to 300% of the expiring annual premium as a single payment due inside a short election window, sometimes as short as 30 days by state law.

In this article

• Claims-made coverage watches the calendar, not the work
• What a tail buys you, and what it does not
• What tail coverage actually costs: Bernard’s numbers
• The election window you cannot let pass
• Frequently asked questions

Bernard Achebe closed his one-man structural engineering consulting practice in Charlotte, North Carolina, in March 2024, and skipped the $18,400 tail endorsement his broker quoted him on the way out the door. He had run the firm for eleven years, mostly certifying foundation and retrofit calculations for small commercial buildings, and his claims-made professional liability policy had never once paid a claim. In June 2025, a general contractor sued him, alleging that a 2019 warehouse retrofit report Bernard had signed understated the roof’s snow-load capacity. Whether that calculation actually holds up is still being litigated. What is not in dispute is that Bernard has no insurance responding to the claim at all.

Claims-made coverage watches the calendar, not the work

Most professional liability policies, including the errors and omissions (E&O) coverage engineers, accountants, consultants, and architects carry, are written on a claims-made basis. A claims-made policy only responds to a claim that is reported while the policy is in force, or during a valid tail period. It does not matter when the underlying work happened. If Bernard’s report was signed in 2019 but the lawsuit landed in 2025, a claims-made policy has to be active in 2025, when the claim shows up, not 2019, when the work was done.

An occurrence policy works the opposite way. It responds to whatever happened during the policy period, no matter when the claim is eventually filed, even years after the policy itself has expired. Occurrence coverage is common in general liability, but professional liability carriers almost universally write claims-made instead, because the exposure on a single piece of professional advice can surface a decade or more after the engagement ends. That timing gap between when the work was done and when a claim can arrive is exactly what a tail endorsement is built to close, and exactly what Bernard let close on him.

Factor	Claims-Made Policy	Occurrence Policy
What triggers coverage	The date the claim is reported	The date the covered work or incident happened
Coverage after the policy ends	None, unless a tail (ERP) is purchased	Still applies to work done during the policy period
Retroactive date matters	Yes, work before it is excluded	No retroactive date used
Common in	Professional liability, E&O, medical malpractice	General liability, most property lines
Best for	Carriers pricing long-tail professional risk	Policyholders who want the trigger tied to the incident, not the paperwork

What a tail buys you, and what it does not

The Extended Reporting Period, universally shortened to ERP or “tail,” is defined by the International Risk Management Institute (IRMI), a widely used insurance and risk-management trade reference, as “the designated time period after a claims-made policy has expired during which a claim may be made and coverage triggered as if the claim had been made during the policy period.” That definition is narrower than most people assume. A tail extends the window to report a claim on work already covered. It does not create new coverage, and it does not move the policy’s retroactive date, the point before which no prior work is covered at all. Our earlier look at how a retroactive date gap works covers that separate mechanic in depth, and the two problems compound each other: buying a tail with no retroactive date protection, or letting the retroactive date reset at a new carrier, can leave the same kind of gap a missed tail creates.

A tail also will not cover anything Bernard did after March 2024. If he had taken on one more consulting project after closing the firm, without a new policy, that work would have no coverage at all, tail or no tail. The ERP is strictly retrospective. It buys time to report, not a new grant of coverage for new acts.

What tail coverage actually costs: Bernard’s numbers

Tail pricing is usually quoted as a percentage of the policy’s final annual premium, paid once, rather than a fresh year of premium. ALPS Insurance, a carrier that insures lawyers and law firms, publishes its own guidance on the endorsement, calling the same product an Extended Reporting Period Endorsement (ERE), and states plainly that the charge “is usually specified in the policy,” that “often the cost is a fixed percentage of the final policy’s premium,” and that it “can range from 100% to 300% depending on the duration of the purchased ERE.” ALPS writes for attorneys specifically, but the percentage-of-premium structure it describes is the same one carriers use across claims-made professional liability lines generally, including engineering E&O like Bernard’s. A short, fixed reporting period sits at the low end of that range. An unlimited reporting period, which never expires, sits at the top.

Bernard’s expiring annual premium was $18,400. His broker quoted a one-year tail at the low end of that common range, 100%, for a flat $18,400, and a longer, unlimited option at the top of that same range, 300%, for $55,200 as a single payment. A three-year option, priced roughly midway between those two endpoints at an estimated 150%, would have run about $27,600. None of those figures repeat annually. Each is a one-time charge that buys a fixed window, or no window at all, to report a claim tied to work already finished.

Bernard skipped all three to save the money. The 2025 lawsuit arrived roughly fifteen months after his firm closed, which is longer than even the cheapest one-year tail would have covered, and construction-related professional liability claims routinely surface years after a project wraps, long after a short reporting window has closed. If Bernard had paid the $27,600 for a three-year tail instead of nothing, this claim would be his insurer’s problem to defend. Instead, every dollar of his own defense, and any settlement, comes out of his own pocket, on top of whatever a court eventually decides about the 2019 calculations themselves. Once a claim like this is covered, defense spending against the policy limit is its own separate risk, one we cover in how defense costs erode a professional liability limit, but Bernard never got that far. He has no limit to erode, because he has no policy responding at all.

The election window you cannot let pass

Tail coverage is not something you can decide to buy months later once a claim shows up. Nearly every claims-made policy requires the election, and full payment, inside a defined window after the policy cancels or is not renewed. North Carolina, where Bernard practiced, sets that floor by statute. Under G.S. 58-40-140, any commercial general liability or professional liability policy that offers an ERP must provide “a 30-day period after the effective date of the cancellation or nonrenewal during which the insured may elect to purchase coverage for the extended reporting period,” and the ERP’s aggregate limit must equal 100 percent of the expiring policy’s aggregate limit. That 30-day floor is the minimum North Carolina allows; a carrier can offer longer, but nothing shorter, once notice of cancellation or non-renewal takes effect.

Not every state sets a statutory floor at all, and where none exists, the number is whatever the policy itself says, which can be shorter than 30 days. Bernard’s broker sent the quote inside that window in 2024. Bernard never sent back an election or a check, the window closed, and by the time the 2025 lawsuit arrived, the option to buy a tail on that expired policy no longer existed at any price.

Marsh’s own Q2 2026 Global Insurance Market Index shows why this decision matters more for a solo consultant than the headline market might suggest. Marsh reports US financial and professional liability rates up just 1% for large corporate accounts that quarter, a large-account, brokered-placement population, not the small solo-practice book Bernard’s policy came from. A soft, flattening market for big firms says nothing about whether a solo practitioner’s own tail quote is worth paying. The premium line was easing for large accounts; the exposure on Bernard’s own signed reports never went anywhere.

Frequently asked questions

How much does tail coverage cost on a professional liability policy? Tail, or Extended Reporting Period, coverage is typically priced as a percentage of your expiring annual premium, paid once. ALPS Insurance states the charge commonly ranges from 100% to 300% depending on how long the reporting period lasts, with a short, fixed period at the low end and an unlimited period at the top.

How long do I have to buy tail coverage after my policy is canceled? It varies by state and carrier. North Carolina law guarantees a minimum 30-day window after cancellation or non-renewal to elect an Extended Reporting Period, per G.S. 58-40-140. Some states set a different floor, and where no statute applies, whatever your policy says controls, so check it before you cancel.

Does tail coverage cover new mistakes made after my policy ends? No. An Extended Reporting Period only extends the time you have to report a claim tied to work performed while the policy was active. It does not cover any new work, advice, or engagement taken on after the policy expired, tail or no tail. For that, you need active coverage in force.

What happens if I do not buy tail coverage and get sued later? If a claim is reported after your claims-made policy expired and you never purchased a tail, no professional liability policy responds to it, regardless of when the underlying work happened or whether it was ever proven negligent. You personally cover the defense costs and any settlement or judgment.

Is tail coverage the same as extending my retroactive date? No, and confusing the two is a common, costly mistake. A tail extends how long you have to report a claim on already-covered work. A retroactive date sets how far back your coverage reaches in the first place. Buying a tail with a bad retroactive date can still leave real work uncovered.