UW System Travel Regulations
VI. TAXIS AND AIRLINE LIMOUSINES
Reasonable and necessary charges for taxi and airline limousines, including tips at a maximum rate of 15% of the charge, are reimbursable when other modes of travel are not available or practical. To avoid unnecessary taxi expenses, employees should utilize regularly scheduled airport bus or limousine service between terminal facilities and hotels, many of which offer complimentary shuttle services. The starting point, destination and purpose should be indicated on the TER. Receipts must be provided if the one-way or round-trip fare exceeds $25.