41 C.F.R. § 301-51.201 – Maximum travel advance amount.

The amount the agency advances the employee may not exceed the following amounts:

Table 1 to § 301-51.201
For	The maximum amount the agency may advance is
Cash transaction expenses	The estimated amount of the employee's cash transaction expenses.
Non-cash transaction expenses (See § 301-51.200)	Generally zero, however see § 301-51.200. If the employee is authorized a travel advance for non-cash transaction expenses, the agency will determine the maximum amount the employee is authorized to receive.