Prior Acts Coverage / Nose Coverage
Also known as: Nose Coverage, Prior Acts
Inverse of ERP / Tail Coverage. Granted by new Claims-Made carriers to maintain retroactive-date continuity when switching. Critical for any professional switching Pro Liab carriers.
On a claims-made policy—such as the ISO Commercial General Liability claims-made form CG 00 02—prior acts coverage is governed by the policy's retroactive date, which sets the earliest date a covered wrongful act can have occurred and still be insured.
Real-world scenario
Meridian Advisory Group, a 14-person management-consulting firm with $2,400,000 in annual revenue, had carried professional liability (E&O) with the same insurer since 2019. Its expiring policy cost $8,400 a year for a $1,000,000 per-claim / $2,000,000 aggregate limit with a $10,000 deductible. When a competing carrier offered better service at $7,900, Meridian's broker flagged the trap: because E&O is written on a claims-made basis, a brand-new policy would set a fresh retroactive date, leaving five years of past engagements uncovered.
To close that gap, Meridian bought full prior acts (nose) coverage from the new carrier, which agreed to keep the 2019 retroactive date for an extra premium of $1,150, bringing the new policy to $9,050. Eight months later, a former client sued over a 2022 strategy engagement, alleging $250,000 in lost profits from flawed advice. Because the incident predated the new policy but fell after the preserved retroactive date, the claim was covered. The insurer funded $85,000 in defense costs and a $175,000 settlement — a $260,000 gross payout — with Meridian responsible only for its $10,000 deductible.
Had Meridian skipped nose coverage, that $260,000 would have been an uninsured out-of-pocket loss. The only alternative would have been buying an extended reporting period (tail) from the old carrier, quoted at $3,900 for 12 months and $9,700 for a three-year term — more than the $1,150 nose endorsement and covering only old claims, not future work.
How it affects your premium
The cost of adding prior acts (nose) coverage depends less on a flat rate and more on how much past exposure the new carrier is agreeing to absorb. Key drivers include:
- Length of the retroactive period — the further back the preserved retroactive date, the more prior years of work the carrier must cover, which raises the nose charge.
- Prior claims and loss history — a clean loss run keeps the endorsement cheap; open claims or frequent circumstances can make full prior acts hard to obtain at any price.
- Profession and severity profile — high-severity fields (medical, financial, legal, tech E&O) command steeper nose pricing than lower-risk consulting because past-work claims can be large.
- Policy limits carried over — matching the prior aggregate limit costs more than stepping down to a lower limit for the retro period.
- Known circumstances at binding — anything reported or reasonably foreseeable is typically excluded, and heavy uncertainty pushes underwriters toward a higher load or a laser exclusion.
- Continuity of coverage — an unbroken chain of prior claims-made policies signals lower risk than a firm patching a coverage gap, which underwriters price up.
- New-carrier appetite — some insurers offer free full prior acts to win the account; others charge a distinct percentage-of-premium load.
Common misconceptions
Myth: Switching E&O carriers is safe as long as there's no gap in coverage dates.
Reality: A same-day switch still resets the retroactive date to the new policy's inception unless you buy prior acts (nose) coverage; work done under the old policy becomes uninsured the moment the old claims-made policy expires.
Myth: Prior acts coverage and tail coverage are the same thing, so you only need one.
Reality: They point in opposite directions: nose coverage on the new policy insures your past work going forward, while an extended reporting period (tail) keeps the old policy alive to accept late claims. You typically buy one or the other, and nose is usually cheaper.
Myth: Prior acts coverage will pay for problems I already know about.
Reality: No — claims or circumstances known or reported before the new policy incepts are excluded. Nose coverage only responds to genuinely unknown prior acts, similar to the known-loss rule.
Frequently asked questions
What is the difference between prior acts coverage and a retroactive date?
Do I need nose coverage or tail coverage when I switch insurers?
Which policies commonly involve prior acts coverage?
Does prior acts coverage cost extra?
Will prior acts coverage cover a claim I already know is coming?
Sources cited
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