This document establishes the formal computational framework for determining eligibility and payment amounts for the Family Income Supplement program in the United Kingdom as of 1980. The text provides the statutory instrument detailing the specific mathematical formulas and administrative criteria required for government officials to process benefit claims. It serves as the primary regulatory authority for the implementation of income support policies during this period.

Legal professionals and historians utilize this text as a primary source for understanding the administrative mechanics of 1980s British welfare policy. Experts note that the prose is highly technical and intended strictly for regulatory compliance rather than general public guidance.