(a) Insured status. This subpart explains what we mean when we say that a person has insured status under the social security program. It also describes how a person may become fully insured, currently insured or insured for disability benefits. Your insured status is a basic factor in determining if you are entitled to old-age or disability insurance benefits or to a period of disability. It is also a basic factor in determining if dependents' or survivors' insurance benefits or a lump-sum death payment are payable based on your earnings record. If you are neither fully nor currently insured, no benefits are payable based on your earnings. (Subpart D of this part describes these benefits and the kind of insured status required for each.) In §§ 404.110 through 404.120 we tell how we determine if you are fully or currently insured. The rules for determining if you are insured for purposes of establishing a period of disability or becoming entitled to disability insurance benefits are in §§ 404.130 through 404.133. Whether you have the required insured status depends on the number of quarters of coverage (QCs) you have acquired.

(b) QCs. This subpart also sets out our rules on crediting you with QCs. QCs are used in determining insured status. In general, you are credited with QCs based on the wages you are paid and the self-employment income you derive during certain periods. (See subpart K of this part for a definition of wages and self-employment income.) Our rules on how and when you acquire a QC are contained in §§ 404.140 through 404.146.