Per diem is the allowance for lodging (excluding taxes for domestic destinations) and meals & incidental expenses* (M&IE). The General Services Administration (GSA) establishes per diem rates for destinations within the Continental United States (CONUS).

Per diem rates for Alaska, Hawaii and United States possessions (referred to as OCONUS) are established by the Department of Defense.

The rates for all foreign travel are established by the U.S. Department of State. Per diem is the allowance for lodging (including taxes for foreign destinations) and meals & incidental expenses* (M&IE).


*Incidental expenses as defined by the Federal Travel Regulations include: fees and tips given to porters, baggage carriers, bellhops, hotel maids, stewards or stewardesses and others on ships, and hotel servants in foreign countries. On foreign travel, laundry and dry cleaning are considered incidental expenses.

Domestic Per Diem Rates
Foreign Per Diem Rates


Exceptions:   ****For trips commencing on or after October 1, 2016:

Travel days to and from all international destinations will be reimbursed at:
75% of the current DuPage County rate.

Per Diem for non-travel days at CERN will be reimbursed as follows based on the length of stay:
Less than 1 month = $80.00 / day
1-3 months = $60.00 / day
3 months - 1 year = $50.00 / day

Travelers who spend less than the daily (M&IE) rate may elect to be reimbursed for their actual costs incurred.  The traveler should note “Traveler elects to pay actual (M&IE) costs instead of claiming per diem.” on their travel voucher when it is submitted for reimbursement.  When this election is made it must be for an entire trip.