TIGTA assesses how well IRS Examination function scrutinizes all open tax periods during audits [Audit Report No. 2009-30-034]:
IRS Examination function employees do not always appropriately inspect and examine prior and/or subsequent year tax returns when warranted, the Treasury Inspector General for Tax Administration (TIGTA) said in a new audit.
Auditors reviewed 68 statistical sample cases and found that 13 (or 21%) of the cases warranted scrutiny of additional returns but none were selected for examination. In 26 (or 38%) of the 68 cases, “there was no evidence that examiners inspected either the prior or subsequent year return to identify similar issues to the years under examination or if large, unusual, or questionable items existed that would warrant examination,” the audit said. Factors that might be considered include the comparative size of an expense, if the nature of the item is significant, the beneficial effect of the manner in which an item is reported, and missing items on the return.