On September 17, 2021, we notified the Director, Submission Processing, Wage and Investment Division, of our concerns with the processing of a backlog of taxpayer address changes using a first-in/first-out method. As of August 27, 2021, the Ogden Entity function had more than 173,000 address change requests in its ending inventory. In our discussions with Ogden Entity function management, they estimated that due to the backlog of inventory, more than 50 percent of the address change requests the staff were working had already been made by other means, e.g., the filing of a tax return that automatically updates the taxpayer’s address. As such, Entity function employees were needlessly expending resources working address change requests for which the address was already updated. We recommended that the IRS evaluate changing the order in which address changes are worked to a last-in/first-out method.