20 CFR 404.620 : Employees' Benefits (§ 1.1 To Parts 1011-1099) — (Part 400 To Part 499) — Social Security Administration (Part 400 To Part 499) — Federal Old-Age, Survivors And Disability Insurance (1950- ) (§ 404.1 To § 404.2127) — Filing Of Applications And Other Forms (§ 404.601 To § 404.641) — Effective Filing Period Of Application (§ 404.620 To § 404.623) — Filing before the first month you meet the requirements for benefits.