Enforcement actions regarding Employee Retention Credit (“ERC”) claims are on the uptick. An important question is how long the IRS and the Department of Justice have to carry out their missions. The normal rules on timing are straightforward, but things get complicated when one considers exceptions, special rules for particular quarters, potential changes contemplated by Congress, and a novel decision by a Court of Appeals that has received little attention. This article, the latest in a long series on ERC issues, explores the key timing issues, old and new, in the context of ERC disputes.