when is per diem authorize
1 The Federal Travel Regulation (FTR) Â§Â§301-11.300 through 306 notes that if lodging is not available at your temporary duty location, your agency may authorize or approve the maximum per diem rate of up to 300% of per diem for the location where lodging is obtained. If the city or county you are looking for is not listed on the GSA per diem rate page, then the standard CONUS rate of $89 for lodging and $51 for meals applies.