Which of the following billing schedules is NOT used for project billing only?

The Standard Billing Schedule is categorized as a billing method that is not exclusively tied to project billing. Unlike the other options, which are specifically structured for managing the complex billing needs of projects—such as tracking time and materials or adhering to fixed bid agreements—the Standard Billing Schedule can be used across a variety of billing scenarios beyond just project-based work.

This versatility makes the Standard Billing Schedule applicable in different contexts, such as recurring billing or general invoicing for ongoing services, rather than being limited to the project-centric approaches represented by the other schedules. Understanding this distinction is crucial for accurately managing billing strategies in different business situations, particularly in a comprehensive financial management system like NetSuite.