This report reviews the Internal Revenue Service's (IRS) processes for handling undeliverable mail. GAO identifies the amount of undeliverable and the reasons why some of the mail IRS sends to taxpayers was undeliverable and the impact nondelivery of this mail had on taxpayers and IRS. GAO focuses on notices IRS sent taxpayers on the assessment and collection of taxes. GAO also assesses IRS' procedures for processing undeliverable mail.

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