Getting audited is such a hassle! Just ask the IRS.

A new report from the Government Accountability Office inspected the tax agency’s financial statements from the 2009 fiscal year with the exacting thoroughness of, well, of an IRS auditor, and found a few billion-dollar errors.

According to the report (PDF), the IRS made a variety of accounting errors last year that “could adversely affect the reliability of its financial statements” and result in “duplicate or erroneous refunds.” Among the mistakes were a “failure to record the receipt of a taxpayer’s $3 million payment” and an $8 billion discrepancy between two accounting systems tracking how much money taxpayers owe. The audit also found a $5.1 billion “unexplained variance” between the total amount the agency took in last year and the amount its detailed tax files said it took in.

But what’s a few billion here or there, right?

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