Trucking umbrella and excess liability: the limits above your primary auto policy

The terms are used loosely, but they are different products.

Umbrella liability, as IRMI defines it, is a high-limit layer that sits above primary policies such as commercial auto, general liability and employer's liability. It does three things: it adds limits when an underlying limit is exhausted by payment of claims; it drops down to replace an underlying aggregate limit that has been exhausted; and it may cover some claims the underlying policies do not, subject to a self-insured retention.

Excess liability usually only adds limit. A follow form excess policy is subject to the terms and conditions of the policy below it. IRMI cautions that many excess policies say they follow form "except" for certain terms, and when that is true the policy is not truly follow form.

For a trucking company, the practical question is not the label. It is: for the claims that worry me most, auto accidents involving my trucks, does the layer above my primary auto policy respond on the same terms, for the same trucks and drivers?

A typical structure for a Texas fleet looks like this:

1. Primary auto liability, often at $1,000,000 combined single limit, which carries the MCS-90 and your federal and TxDMV filings. See truck liability insurance.
2. Primary general liability and employer's liability (if you carry workers' compensation).
3. Umbrella or lead excess, scheduled over those policies.
4. Additional excess layers above the lead, for larger fleets or contracts that require higher totals.

Each layer above primary lists underlying insurance it requires. If the umbrella requires a $1,000,000 primary auto limit and you carry less, or a truck is not covered by the primary at all, the umbrella may not respond until the gap is filled, and you may be responsible for it. Underwriters in trucking commonly ask for the same insured trucks, the same named insureds, and the same radius and operations to be reflected in the primary and the excess.

Note what the umbrella does not fix: the MCS-90 attaches to the policy it is endorsed on and guarantees the federal minimum. It does not make your umbrella respond to a claim the primary excluded. See what is MCS-90.

Contracts. Broker-carrier agreements and shipper contracts often require auto liability limits above the federal minimum, and some require totals that can only be met with an umbrella or excess layer. A contract can also require that the excess be follow form, that the shipper be an additional insured on the umbrella, or that the umbrella be primary and non-contributory over the shipper's own insurance. Read those terms before you sign. See shipper contract insurance requirements.

Claim size. Serious injury claims involving large trucks can exceed $1,000,000. When they do, everything above your limits is a business problem. We do not publish verdict statistics we cannot source; for the concept, see what is a nuclear verdict.

Texas trial rules. Since 2021, Texas Civil Practice and Remedies Code chapter 72 lets defendants in commercial motor vehicle collision cases request a bifurcated trial, with compensatory damages decided before exemplary damages. That law shapes how a trial is run. It does not cap compensatory damages or change the limit you need. Talk to defense counsel about how it applies to a specific case.

Auto exclusions on the umbrella. Some umbrella forms written for general businesses limit or exclude auto liability for heavy trucks, or cover autos only above specific scheduled underlying policies. If the umbrella was bought for the GL and nobody checked the auto wording, it may not be the layer you think.

Hired and leased units. If your primary auto covers leased owner-operator tractors on symbol 68 or 61, check that the umbrella follows. See leasing owner-operators insurance.

Pollution. Many umbrellas exclude pollution, or follow only a specific pollution buyback on the primary. See truck pollution liability.

Employer's liability for nonsubscribers. If you do not carry Texas workers' compensation, you do not have an employer's liability policy for the umbrella to sit over, and many umbrellas exclude injury to employees. See Texas trucking workers' comp.

Renewal changes. Trucking excess capacity changes year to year. If your renewal shows a lower limit or a new exclusion, compare it line by line to your contracts before you accept it. See trucking insurance renewal increase.