Insurance regulation expert witnesses may write reports and opine on insurance claims, insurance business customs and practices, and related topics. Here, the American Insurance Association defines SAP:
Statutory Accounting Principle (SAP): Those principles required by state insurance laws followed by an insurance company when submitting its financial statements to the various state insurance departments. Such principles differ from Generally Accepted Accounting Practices (GAAP) in some important respects. For example, SAP requires that expenses must be recorded immediately and cannot be deferred to track with premiums as they are earned and taken into revenue.