What Sellers Need to Get Right About Tail Coverage Before Closing

Tail coverage can look like a minor line item on the seller's side of a private-company closing checklist. It isn't. By the time the runoff endorsement is being negotiated, the seller's D&O policy may be days from changing at the transaction's effective time, the carrier's window to bind may be closing, and the purchase agreement may already contain insurance language that doesn't match the policy.

That creates an avoidable problem at exactly the wrong time. Sellers are trying to finish diligence and get signatures while former directors and officers need clarity about who will respond if a claim tied to pre-close conduct arrives months or years later.

The important questions aren't complicated, but they need answers before closing.

Know What Happens to the Existing D&O Policy

A D&O policy generally does not simply continue covering the seller's organization in the same way after a change in control. Depending on the policy language, the transaction can trigger runoff treatment so that coverage applies only to wrongful acts occurring before the transaction.

That's why the existing policy should be reviewed well before the closing checklist reaches its final stages. The seller needs to understand the change-in-control language, what happens at closing, and what options are available for extending the period in which claims involving pre-close conduct can be reported.

Working with an experienced insurance broker early enough to review and arrange the appropriate runoff coverage keeps the issue from becoming a last-minute closing problem.

Get the Tail Period Right

Six years is a common runoff period in private M&A transactions, but the number shouldn't simply be copied from the last purchase agreement someone worked on. The appropriate period depends on the potential claims, applicable limitation periods, policy language, and the indemnification obligations negotiated between buyer and seller.

A shorter tail may reduce the premium at closing, but the savings need to be weighed against the possibility that a claim surfaces after the coverage period has expired. That matters particularly when former directors and officers are relying on the runoff as part of their protection after they no longer control the company or its insurance program.

The insurance term and the purchase agreement should therefore be considered together rather than negotiated on separate tracks.

Understand Exactly What the Tail Covers

Buying a tail doesn't create a brand-new D&O policy for everything that happens after closing. Runoff coverage generally addresses claims arising from wrongful acts that occurred before the transaction and are reported during the runoff period.

That distinction becomes more important when a claim involves conduct spanning both sides of the closing date. A dispute might begin with representations or decisions made before closing but involve additional conduct afterward. Whether and how the runoff responds will depend on the actual policy and endorsement language.

Sellers should review those provisions before agreeing to broad insurance promises in the purchase agreement. The premium matters, but the wording that determines what the carrier will actually cover matters more.

Don't Leave Shopping Until After Closing

The best time to evaluate runoff coverage is while the underlying policy is still active and there is time to address questions with the broker and carrier. Waiting until the transaction is about to close can reduce negotiating leverage and turn an insurance decision into a closing-day scramble.

Ideally, the seller should know the expected premium, proposed runoff period, key exclusions, and endorsement language before the final documents are signed. That also gives deal counsel time to make sure the insurance provisions in the purchase agreement line up with what is actually available from the carrier.

The practical sequence is straightforward: review the existing policy, price the runoff, negotiate the terms, bind the coverage, and confirm the endorsement as part of the closing process.

Don't Assume the Buyer's Policy Will Fill the Gap

The buyer's go-forward D&O program serves a different purpose. It is generally designed around the organization and its directors and officers after the transaction, not as a substitute for the seller's protection against claims arising from pre-close conduct.

That distinction matters because the people who made decisions before closing may no longer have any control over the company's insurance after the deal. Assuming another policy will pick up an uncovered claim can leave everyone discovering the gap only after a demand letter arrives.

The seller's runoff coverage, indemnification rights, and the buyer's post-close insurance program should therefore be reviewed as related pieces of the transaction, with each one responsible for the exposure it is actually intended to address.

Get the Runoff Bound Before Closing

Compared with the value of an acquisition, tail coverage can look like a small closing expense. Compared with the cost of defending a claim years later, it can represent significant protection for the people who approved and managed the company before it was sold.

The tail is also only one of the insurance items that moves late. The same final week reprices the R&W binder and surfaces gaps in the target's coverage tower, and sellers should be equally clear on which of their reps the policy actually absorbs before signing.

The best time to solve the issue is while everyone still has leverage and the existing insurance program is in place. Price the runoff early, understand the exclusions, coordinate the coverage with the purchase agreement, and make sure the final endorsement reflects what the parties believe they negotiated.

Once the deal closes, former directors and officers should be able to walk away knowing where their protection for pre-close decisions comes from. That is a much better outcome than reopening the closing documents years later to figure it out.