MCS-90
A federal endorsement guaranteeing minimum financial responsibility for motor carriers, required by FMCSA for interstate trucking operations.
What It Is
The MCS-90 endorsement (Endorsement for Motor Carrier Policies of Insurance for Public Liability under Sections 29 and 30 of the Motor Carrier Act of 1980) is a federal endorsement required on all liability insurance policies for interstate motor carriers. It is not insurance itself—it is a guarantee by the insurer to the public that minimum financial responsibility requirements will be met.
The MCS-90 operates as a safety net. If a motor carrier's underlying policy does not cover a particular accident for any reason—exclusion, cancellation, or exhaustion of limits—the MCS-90 requires the insurer to pay the claim up to the federal minimum ($750,000 for general freight, higher for hazardous materials). However, the insurer then has the right to seek reimbursement from the motor carrier for any amounts paid under the MCS-90 that were not covered by the underlying policy.
The MCS-90 applies only to accidents involving the public on public roads. It does not apply to cargo claims, damage to the insured's own property, or workers' compensation claims.
Why It Matters for Brokers
Brokers placing motor carrier accounts must understand that the MCS-90 is not additional coverage—it is an unfunded mandate that can create significant financial exposure for both the insurer and the motor carrier. If the insurer pays a claim under the MCS-90 that the policy otherwise excluded, the carrier owes the insurer reimbursement. Brokers must ensure underlying coverage is broad enough to minimize MCS-90 activation scenarios.
Real-World Example
An interstate trucker lets his policy lapse but continues operating with an expired MCS-90 on file with FMCSA. He causes a $600,000 accident. The former insurer is forced to pay the $600,000 under the MCS-90 because it was still on file. The insurer then sues the trucker for reimbursement. The trucker, unable to pay, files bankruptcy. The insurer absorbs the $600,000 loss and increases premiums across its motor carrier book by 8% the following year.
Common Mistakes
- 1Treating the MCS-90 as additional insurance coverage rather than a financial responsibility guarantee with reimbursement rights.
- 2Failing to file the MCS-90 with FMCSA after policy inception, which can delay or prevent the carrier from receiving operating authority.
- 3Not removing the MCS-90 filing when a policy is cancelled, leaving the insurer exposed to claims after the policy period ends.
How brokerageaudit.com Handles This
brokerageaudit.com's Policy Checker verifies MCS-90 attachment on all motor carrier policies and cross-references with FMCSA filing status. The system alerts brokers when a motor carrier policy is approaching cancellation so the MCS-90 filing can be withdrawn in coordination with the carrier's replacement coverage. The COI Manager tracks MCS-90 filing status alongside standard certificate requests.