The MCS-90 is a federal financial-responsibility endorsement required on the insurance of for-hire interstate motor carriers (under Sections 29 and 30 of the Motor Carrier Act of 1980, enforced via 49 CFR 387). It is a public-protection guarantee, not extra coverage for you: if a member of the public is owed for bodily injury, property damage, or environmental restoration and the policy wouldn't otherwise pay, the insurer pays the public anyway up to the federal minimum — then the motor carrier must reimburse the insurer. Minimum limits: $750,000 general freight, $1,000,000 oil and certain substances, $5,000,000 for certain hazardous materials. It does not apply to non-trucking/personal use — that gap is filled by Non-Trucking Liability.
The MCS-90 confuses a lot of owner-operators because it looks like coverage but behaves like a surety. It exists to protect the public, not the carrier — a federal backstop that pays accident victims first and then comes back to the carrier for the money. This guide explains the mechanism, the limits, and when it does (and doesn't) apply. Source: IRMI MCS-90 endorsement reference; 49 CFR 387.9 (financial responsibility); FMCSA insurance filing requirements.
general freight
minimums
the insurer
authority
What is the MCS-90?
The MCS-90 is the "Endorsement for Motor Carrier Policies of Insurance for Public Liability under Sections 29 and 30 of the Motor Carrier Act of 1980." It is attached to a motor carrier's auto liability policy to satisfy the federal financial-responsibility requirement enforced by the FMCSA under 49 CFR 387. Its job is to make sure the public can collect for accidents caused by a regulated for-hire carrier.
- It's federally mandated — for-hire carriers operating in interstate commerce must maintain the minimum public-liability limits, evidenced by the MCS-90 (or a BMC-91/91X filing).
- It protects the public, not the carrier — it guarantees payment to injured third parties even where the underlying policy would exclude the loss.
- It's a safety net, not primary coverage — you still rely on your actual policy; the MCS-90 only steps in to protect the public when the policy wouldn't.
Minimum financial-responsibility limits
The federal minimums (49 CFR 387) depend on what's being hauled:
| Minimum limit | Applies to |
|---|---|
| $750,000 | General freight (non-hazardous property) in interstate for-hire commerce. |
| $1,000,000 | Oil and certain hazardous substances / listed materials. |
| $5,000,000 | Certain hazardous materials (e.g., specified explosives, poison gas, or large-quantity hazmat). |
Many shippers and brokers contractually require $1,000,000 auto liability regardless of cargo, so most general-freight carriers carry $1M even though the federal floor for general freight is $750,000.
How it works (public protection + reimbursement)
The MCS-90 has two moving parts that make it unlike ordinary coverage:
- Pay the public first — if a judgment for bodily injury, property damage, or environmental restoration is owed and the policy would not pay it (e.g., a non-scheduled vehicle, an excluded use), the insurer still pays the injured public up to the federal minimum.
- Then the carrier reimburses the insurer — because that payment was outside the policy, the motor carrier is obligated to pay the insurer back. The MCS-90 is a guarantee to the public, financed ultimately by the carrier.
That reimbursement obligation is why relying on the MCS-90 instead of proper coverage is dangerous: a carrier can end up personally owing the insurer the full amount it advanced.
MCS-90 vs your actual insurance policy
| Your auto liability policy | MCS-90 endorsement | |
|---|---|---|
| Who it protects | You (the insured) | The public |
| Pays claims? | Yes, per its terms and exclusions | Only when the policy wouldn't — as a federal backstop |
| Do you owe it back? | No | Yes — you reimburse the insurer |
When it does NOT apply (and NTL)
The MCS-90 backs the carrier's federally regulated for-hire operation. It does not turn personal or non-dispatch driving into covered use. A leased owner-operator driving the tractor outside of dispatch relies on Non-Trucking Liability (NTL), not the motor carrier's MCS-90-endorsed policy. See our commercial truck insurance guide for how the pieces fit together.
Who needs an MCS-90
- For-hire interstate motor carriers hauling regulated commodities must maintain the minimum limits, evidenced by the MCS-90 (and BMC-91/91X for the FMCSA filing).
- Owner-operators with their own authority — if you run under your own MC number, your policy carries the MCS-90.
- Not intrastate-only or private carriers in many cases — requirements vary; hazmat and passenger carriers have their own rules. Confirm your obligation with your agent and the FMCSA.
Frequently Asked Questions
What is the MCS-90 endorsement?
The MCS-90 is a federal endorsement attached to a for-hire motor carrier's auto liability policy under Sections 29 and 30 of the Motor Carrier Act of 1980 (49 CFR 387). It guarantees that the public can collect for bodily injury, property damage, or environmental restoration caused by the carrier — even if the policy would not otherwise pay — up to the federal minimum limit. The carrier must then reimburse the insurer for any such payment.
What are the MCS-90 minimum limits?
Under 49 CFR 387, the minimum public-liability limits are $750,000 for general (non-hazardous) freight, $1,000,000 for oil and certain hazardous substances, and $5,000,000 for certain hazardous materials such as specified explosives or poison gas. Many shippers and brokers require $1,000,000 regardless of cargo, so most general-freight carriers carry $1M even though the federal floor is $750,000.
Is the MCS-90 the same as insurance coverage?
No. The MCS-90 protects the public, not the carrier. It only pays when the underlying policy would not, and then only to satisfy the public up to the federal minimum — after which the carrier must reimburse the insurer. It is a federal financial-responsibility guarantee (a safety net), not primary coverage. You still need a proper auto liability policy.
Does the MCS-90 cover me when I'm not in dispatch?
No. The MCS-90 backs the carrier's regulated for-hire operation, not personal or non-dispatch driving. A leased owner-operator driving the tractor outside of dispatch relies on Non-Trucking Liability (NTL), not the motor carrier's MCS-90-endorsed policy.
Who needs an MCS-90?
For-hire motor carriers operating in interstate commerce must maintain the federal minimum public-liability limits, evidenced by the MCS-90 endorsement and the insurer's BMC-91/91X filing with the FMCSA. Owner-operators running under their own authority carry it on their policy. Requirements differ for intrastate-only, private, hazmat, and passenger carriers — confirm your specific obligation with your agent and the FMCSA.
What is the difference between the MCS-90 and a BMC-91?
The MCS-90 is the endorsement on the policy itself (the guarantee to the public). The BMC-91 / BMC-91X is the filing the insurer submits to the FMCSA to prove that a carrier's public-liability coverage is in force. Together they satisfy the federal financial-responsibility requirement.
Quick glossary — MCS-90 terms
- MCS-90
- Federal endorsement guaranteeing public payment for a for-hire motor carrier's liability, with a carrier reimbursement obligation.
- 49 CFR 387
- The federal regulation setting minimum levels of financial responsibility for motor carriers.
- Financial Responsibility
- The federally required ability to pay for accidents — met with insurance (MCS-90) or an approved surety/bond.
- BMC-91 / BMC-91X
- The FMCSA filing an insurer makes to prove a carrier's public-liability coverage is in force.
- Reimbursement Obligation
- The carrier's duty to pay the insurer back for any MCS-90 payment made outside the policy's terms.
- Non-Trucking Liability (NTL)
- Coverage for a leased owner-operator's non-dispatch use — the gap the MCS-90 does not fill.