The IRS Fails its Own Reimbursement Policy
Recently, the Treasury Inspector General for Tax Administration (TIGTA) reviewed the IRS’ due diligence efforts in tracking employees potentially engaged in temporary assignments greater than a year and whether their travel reimbursements were treated as taxable income in those situations.
They are not doing the best job, and that is partly due to confusion about the rules among the supervisors. They did, however, find that the IRS had established adequate guidance on when travel reimbursements are taxable - in other words, there wasn't an excuse :)
The full report can be found here TIGTA Report