How long is the grace period if BIPD insurance lapses?

The insurer must give FMCSA 30 days' written notice (Form BMC-35) before a BMC-91 filing can be cancelled (49 CFR §387.313(d)). The separate 35-day notice between insurer and carrier is §387.7(b)(1). The 30-day window is the carrier's opportunity to reinstate coverage with a different insurance provider before the cancellation takes effect. Most carriers caught in a cancellation event line up a replacement insurer within that window because there is no path to keep operating without §387 coverage.

On the day the cancellation takes effect, FMCSA's records (Motus public search) reflect the lack of current BMC-91 and the operating authority is treated as non-compliant. Brokers and shippers checking those records see the change and stop tendering loads. The carrier cannot legally operate; even if a load is in motion when the cancellation takes effect, the carrier should park the vehicle until coverage is reinstated.

Replacement BMC-91 from a new insurer is filed electronically with FMCSA. Some carriers choose to overlap policies briefly - purchasing the new policy a few days before the old one cancels so FMCSA's records never show a coverage gap. The overlap costs a few extra premium days but avoids any operational disruption.

Continued operation without current BMC-91 is a federal violation under §387 and exposes the carrier to FMCSA enforcement (revocation of authority, civil penalties under §521.b) plus full personal-injury / property-damage liability without insurance protection. Insurance lapse is one of the leading causes of involuntary MC revocation; the recovery process via reinstatement is covered separately under §365 reinstatement procedures.