3. Revenue Recognition

The Company utilizes the cost-to-cost method of percentage-of-completion to recognize revenue on the majority of its performance obligations that are satisfied over time because it best depicts the transfer of control to the customer. Under the cost-to-cost method of percentage-of-completion, the Company measures progress based on the ratio of costs incurred to date to total estimated costs for the performance obligation. The Company recognizes changes in estimated sales or costs and the resulting profit or loss on a cumulative basis. Contract adjustments represent the cumulative effect of the changes on prior periods. If a loss is expected on a performance obligation, the complete estimated loss is recorded in the period in which the loss is identified.

There is significant judgment involved in estimating costs, particularly in the Transport segment. The Transport segment considers risks of contract performance such as technical requirements, schedule, duration and key contract dependencies. Contract estimates are subject to change throughout the duration of the contract as additional information becomes available that impacts risks and estimated revenue and costs. In addition, as contract modifications such as new orders are received, the additional units are factored into the overall contract estimate of costs and transaction price.

The Transport segment incurs pre-production engineering, factory setup and other contract fulfillment costs related to products produced for its customers under long-term contracts. A deferred contract cost asset is recognized for costs incurred to fulfill an existing contract or highly-probable anticipated contract if such costs generate or enhance resources that will be used in satisfying performance obligations in the future and the costs are expected to be recovered. Costs related to customer-owned tooling that will be used in production and for which the customer has provided a non-cancelable right to use the tooling to perform during the contract term are also recognized as a deferred contract cost asset. Deferred contract costs related to the Next Generation Delivery Vehicles (NGDV) contract with the United States Postal Service (USPS) are amortized over the anticipated production volume of the NGDV contract. The Company periodically assesses its deferred contract costs for impairment. The Company did not recognize any impairment losses on contract fulfillment or customer-owned tooling costs in the three months ended March 31, 2026 or 2025.

The Company estimates that deferred contract costs exceed future profits on existing orders by approximately $125 million at March 31, 2026.

Disaggregation of Revenue

See Note 19 for further disaggregated sales information.

Contract Assets and Contract Liabilities

The timing of billing does not always match the timing of revenue recognition. In instances where the Company recognizes revenue prior to billing, the Company records a contract asset (i.e., unbilled receivables). Unbilled receivables are classified as current assets and include amounts that may be billed and collected beyond one year due to the long-cycle nature of many of the Company's contracts. The Company reduces contract assets when the Company has an unconditional right to payment. The Company establishes allowances for expected credit losses associated with contract assets. The Company did not record any losses on unbilled receivables in the three months ended March 31, 2026 or 2025.

The Company is generally entitled to bill its customers upon satisfaction of its performance obligations, except for its long-term contracts in the Transport segment which typically allow for billing upon acceptance of the finished goods, payments received from customers in advance of performance, payments for rights to purchase future goods and extended warranties that are billed in advance of the warranty coverage period. Customer payment terms generally do not exceed one year. See Note 8 for additional information on the Company’s receivables balances.

With the exception of Pierce Manufacturing Inc. (Pierce) in the Vocational segment, the Company’s contracts typically do not contain a significant financing component. Pierce customers earn interest on customer advances at a rate determined in a separate financing transaction between Pierce and the customer at the time Pierce receives the advance. Interest on customer advances is recorded in “Interest expense” and was $15.7 million and $11.0 million for the three months ended March 31, 2026 and 2025.

In instances where a customer pays consideration in advance or when the Company is entitled to bill a customer in advance of recognizing the related revenue, the Company records a contract liability. The Company reduces contract liabilities when the Company transfers control of the promised goods and services. Contract assets and liabilities are determined on a net basis for each contract.

Contract liabilities consisted of the following (in millions):

The Company offers a variety of service-type warranties, including optionally priced extended warranty programs. Outstanding balances related to service-type warranties are included within contract liabilities. Revenue related to service-type warranties is deferred until after the expiration of the standard warranty period. The revenue is then recognized ratably over the term of the service-type warranty period. Changes in the Company’s service-type warranties were as follows (in millions):

Remaining Performance Obligations

As of March 31, 2026, the Company had unsatisfied performance obligations for contracts with an original duration greater than one year totaling $12.2 billion, of which $3.7 billion is expected to be satisfied and recognized in revenue in the remaining nine months of 2026, $5.3 billion is expected to be satisfied and recognized in revenue in 2027 and $3.2 billion is expected to be satisfied and recognized in revenue beyond 2027.