Determine the circumstances of travel. If you want to deduct your business expenses, you must complete Form 2106 and itemize your deductions.Mileage OUT of SD County. Requests for reimbursement of out-of-state travel expenses must be claimed separately. You may be asked to submit receipts for some travel expenses such as hotel and airfare receipts. Employees have 30 days from the completion of travel to submit an expense report in Workday Expenses. Reimbursement forms may be obtained from your department Human Resources staff. Why is Medicare tax withheld from my pay? We are in the process of sending out amended receipt notices for individuals with a pending Form I90. Charge my official expenses to the GTCC wherever possible rather than use cash withdrawals or another form of payment.