OVERVIEW: Calculation of travel per diem rates within the Federal government is a shared responsibility of three organizations:

• The General Services Administration (GSA) provides rates for the Continental US. GSA updates the Continental US rates once a year or as necessary, normally the rates are updated in October. If you are a uniformed member or DoD federal civilian and have questions regarding the adequacy of per diem rates, please see Per Diem Rate Review under Frequently Asked Questions (FAQs) for appropriate procedures. All Non-uniformed and Non-DoD federal civilians please e-mail GSA at travel.policy@gsa.gov or go to Contact information for Travel Management Policy.
  
  
• The Department of State provides rates for non-U.S. Overseas locations and updates these rates at the beginning of every month. If you are a uniformed member or DoD federal civilian and have questions regarding the adequacy of per diem rates, please see Per Diem Rate Review under Frequently Asked Questions (FAQs) for appropriate procedures. All Non-uniformed and Non-DoD federal civilians please contact the Office of Allowances at AllowancesO@state.gov / 202-663-1121
  
  
• The Defense Travel Management Office provides rates for locations outside the Contiguous US and Overseas Non-Foreign areas.; E.g. Alaska, Hawaii, Puerto Rico, Guam, etc. If you have questions or concerns regarding OCONUS Non-Foreign per diem rates, please submit an inquiry from the Questions Section .
  

The Defense Travel Management Office adds DOD unique footnotes, DOD Installations, & proportional meal rates to rates published by DOS, GSA and DTMO .