Prior Acts, Tail Coverage & Retroactive Dates Explained for Attorneys

By Tamir Lerner | Law Firm Insurance Pros | Updated July 2026

Three terms confuse more attorneys than any others in professional liability: retroactive date, prior acts, and tail coverage. They are all answers to the same question — in a claims-made world, how do I stay covered for work I did in the past? Get them right and your history stays protected. Get them wrong and years of past work can fall through the cracks.

What is a retroactive date?

Your retroactive date is the earliest date of legal work your policy will cover. For a claim to be covered under a claims-made policy, two things must be true: the alleged error must have occurred on or after the retroactive date, and the claim must be reported during the policy period.

A first-time buyer often has a retroactive date equal to the policy's start date, meaning only work done from that day forward is covered. As you renew year after year with continuous coverage, that original retroactive date stays put, and the window of covered prior work grows. That is why an established attorney's retroactive date might be many years in the past — and why protecting it is so valuable.

What is prior acts coverage?

Prior acts coverage (sometimes called nose coverage) is what keeps your history protected when you move to a new carrier. When you switch policies, you generally want the new carrier to honor your existing retroactive date so that all the past work you built up under the old policy stays covered under the new one.

If a new policy instead sets a fresh retroactive date equal to its start date, you create a gap: work done before the switch would no longer be covered by anyone. Always ask a new carrier to grant "full prior acts" or match your existing retroactive date. This is one of the most important things to verify when shopping your coverage.

What is tail coverage (extended reporting period)?

Tail coverage, formally an extended reporting period (ERP), solves the opposite problem: what happens when your claims-made policy ends and is not replaced. Because claims-made coverage only responds while a policy is active, ending coverage without a tail can leave all your past work unprotected.

A tail extends the window in which you can report claims for work done before the policy ended. You typically need it when you:

• Retire from practice
• Sell or dissolve the firm
• Leave private practice (for example, joining a company or the bench)
• Switch to a new carrier that will not grant prior acts coverage

Tails can often be purchased for one, three, five years, or an unlimited period. A retiring attorney frequently buys an unlimited tail so past work stays reportable for life. Note that a tail does not cover new work — it only extends the reporting window for acts that occurred before the policy ended.

Prior acts vs tail: what is the difference?

Think of it this way: prior acts coverage carries your history forward to a new policy, while a tail keeps your history reportable backward after coverage stops. In most carrier-to-carrier switches, prior acts coverage is the cheaper, cleaner option because it avoids buying a tail at all.

How much does tail coverage cost?

Tail pricing is expressed as a percentage of your expiring annual premium and rises with the length of the reporting period. As a general planning guide, a one-year tail may cost a fraction of your annual premium, while a longer or unlimited tail commonly runs somewhere in the range of one to three times the expiring annual premium. Many carriers also offer free or discounted tails for attorneys who retire after a set number of continuous years insured, or in the event of death or disability. Confirm the exact terms in your policy. The ABA Standing Committee on Lawyers' Professional Liability and IRMI both cover extended reporting provisions in detail.

How attorneys avoid gaps

1. Know your retroactive date and treat it as an asset worth protecting.
2. Insist on prior acts coverage whenever you switch carriers.
3. Never let coverage lapse between policies.
4. Plan tail coverage before you retire, sell, or close the firm, not after.
5. Read the ERP provisions for cost, length, and free-tail conditions before you buy the policy.

This article is general information, not legal or insurance advice. Retroactive date rules, prior acts terms, and tail pricing vary by carrier and state. Review actual policy language and consult a licensed insurance professional before making decisions.