Last-Digit Filing-Month Rule

Also known as: Last Digit Month Rule, USDOT Last Digit

By Korey Sharp-Paar · Reviewed by the Fast Trucking Compliance team

Definition

The last-digit filing-month rule sets the month a carrier’s MCS-150 biennial update is due, from the last digit of the USDOT number. The mapping is 1 = January, 2 = February, 3 = March, 4 = April, 5 = May, 6 = June, 7 = July, 8 = August, 9 = September and 0 = October (49 CFR 390.19T). The update is due by the last day of that month. November and December are never filing months under the rule. Pair it with the next-to-last-digit rule to find the year: USDOT 12345 is due by May 31 in even-numbered years.

Authoritative source

49 CFR §390.19T - MCS-150 biennial update

MCS-150 Filing Schedule: When Is Your Biennial Update Due?

Your MCS-150 due month and year are set by your USDOT number. Learn the exact FMCSA schedule so you never miss a biennial update deadline.

Related terms

Next-to-Last-Digit Year Rule(Even/Odd Year Rule)
Biennial Update(MCS-150 Biennial Update)
MCS-150(Motor Carrier Identification Report)

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