How do I find my FMCSA PIN to file MCS-150 online?
FMCSA mails a PIN to the carrier's registered address shortly after USDOT issuance, used for FMCSA Portal login. If you don't have the PIN, you can request a new one through the FMCSA Portal's "Forgot PIN" flow or by calling FMCSA at 800-832-5660. The replacement PIN typically arrives by mail within 7-10 business days.
The FMCSA PIN is the original authentication credential issued at USDOT registration. It comes by mail to the principal-place-of-business address on file. Older registrations (pre-2010 or so) often have lost PINs because the address has changed multiple times since the original mailing.
The Portal's "Forgot PIN" flow generates a replacement PIN and mails it to the address currently on file. Carriers whose address is also out of date should file the address change first (sometimes via paper if the portal access is locked out), then request the PIN replacement.
For carriers without portal access at all, the FMCSA call line at 800-832-5660 can verify identity through alternate means and either mail a PIN or process a manual filing over the phone. Wait times can be long during peak filing periods (typically late July through August for the IFTA-aligned filers and during the carrier's own due-month batch).
Most third-party filing services (Fast MCS-150, Fast UCR, others) maintain their own portal access for clients and do not require the carrier-side PIN to file. Using a service is the cleanest workaround for carriers locked out of their portal account.