This regulatory document establishes specific amendments to the existing Social Security (Contributions) Regulations regarding the calculation and collection of national insurance contributions. The text is authored by the legislative body of Great Britain, functioning as a formal instrument of statutory law. It provides the legal framework necessary to adjust contribution rates and administrative procedures for the 1990 fiscal period.

Legal professionals and government administrators utilize this document as a primary source for historical regulatory compliance and statutory research. It is recognized as a technical legal instrument requiring specialized knowledge of British social security law for accurate interpretation.