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Expiration Date

The expiration date is a date that applies to per diem rates, which is important when calculating a trucker's M&IE expense.  The expiration date is the last date that CONUS or OCONUS per diem rates are valid.  When a truck driver calculates M&IE via city-by-city method, the effective date, the expiration date, the seasonal start date, and the seasonal end date are all checked against the date of each layover that gets entered.

Often, the expiration date for per diem rates occurs on October 1st.  That date marks a time called the transition period, which is the last three months of a calendar year.

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