Errors and omissions (E&O) claims don't happen immediately. Clients might discover problems months or years after you complete work, then file lawsuits long after you've moved on. E&O insurance operates on a claims-made basis, requiring your policy to be active when both the error occurred and when someone files the claim.
Continuous coverage becomes essential because of this timing issue. Your policy handles legal defense costs, settlements and judgments when clients sue over covered professional mistakes. Dropping coverage leaves you vulnerable to claims from previous projects, but getting tail insurance extends financial protection when changing careers or retiring.