If I travel on government business, do I have to use a government-issued charge card?
Generally, you must use the card for routine travel expenses such as airplane tickets, hotels, and meals and then you are billed for those expenses. The law requires agencies to reimburse employees quickly but also allows agencies to obtain personal financial records and garnishee salaries when employees are late in paying the credit card bills for undisputed charges.

However, agencies are allowed to exempt categories of employees and certain types of expenses from the requirement to use the cards. Also, there are some general exceptions such as use of transit systems at a temporary duty location.