Do we need both?
No, and buying both is waste. They address the same exposure from opposite directions. What you must not do is end up with neither, which is the common outcome when nobody owns the question during a transaction.
TL;DR
- Both solve the same problem: care delivered in the past producing a claim in the future, after the policy that covered that period has expired.
- They solve it from opposite ends, and the choice is usually driven by availability and by who is paying rather than by any technical superiority.
Comparison
Tail on the old policy versus Prior acts on the new policy
At a carrier change or a sale, do we buy tail or take prior acts?
Whose decision: Operators changing markets, and both sides of a facility transaction.
Last updated
Side by side
| Factor | Tail on the old policy | Prior acts on the new policy |
|---|---|---|
| Which policy responds | The expiring policy, with an extended reporting window | The new policy, reaching back to a matched retroactive date |
| Who typically buys it | The seller or the departing insured | The buyer or the continuing insured |
| Cost basis | A multiple of the expiring annual premium, fixed in the policy | Priced into the new program |
| Duration | A stated period, defined in the policy | Continues while the new program is maintained |
| Limit available | Usually the expiring limit, not reinstated | The new program limit |
| Risk if the market will not offer it | Purchase right may be conditioned; check whether it survives a carrier-initiated non-renewal | The new market may decline to match the retro date |
The recommendation
Prefer a matched retroactive date; use tail when the new market will not match
A matched retroactive date on the continuing program is usually the better answer where it is available, because it keeps one policy responding to everything and gives the older years the benefit of the current limit rather than the expiring one.
Where a market will not match the retro date, buy tail on the expiring program before it lapses. What is not acceptable is accepting an advanced retro date and moving on, because the resulting gap is permanent and grows more expensive to discover the longer it goes unnoticed.
In a transaction, this is a negotiated deal term rather than a rule, and the side that has read the tail multiplier before the negotiation usually wins it. Read three things now: the tail length, the premium multiplier, and whether the purchase right survives if the carrier is the one who non-renews you.
Follow-up questions
Tail on the old policy versus Prior acts on the new policy: what people ask next
Does tail reinstate the limit?
Usually not. A tail typically extends the reporting window on the expiring limit rather than providing a fresh one, which is one reason a matched retroactive date on the new program is often preferable.
Go deeper
Other comparisons
Defense inside the limit versus Defense outside the limit
Should I pay more for defense outside the limit?
Claims-made versus Occurrence
Which trigger should a senior care liability program be written on?
Admitted carrier versus Surplus lines
Should I insist on an admitted carrier?
Risk retention group versus Commercial carrier
Should we put our program in a risk retention group?
Captive versus Guaranteed cost
Is a captive the right structure for us, or should we stay on a guaranteed cost program?
Shared aggregate versus Per location aggregate
Is a per location aggregate worth the extra premium?
Free coverage review
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