The Internal Revenue Service handled tens of thousands of cases of fraudulent returns involving identity theft during the 2013 filing season, AccountingToday reported. The new report from the Treasury Inspector General for Tax Administration showed the IRS identified and confirmed 236,313 fraudulent tax returns involving identity theft as of April 30. Overall, the IRS identified 268,233 tax returns with more than $1.48 billion claimed in fraudulent refunds and prevented the issuance of more than $1.32 billion (88.9 percent) of the fraudulent refunds it identified. Overall, the report said, the IRS managed to function well this past tax season, despite a two-week delay as a result of the government shutdown last fall.