20 C.F.R. § 404.803 – Conclusiveness of the record of your earnings.

(a) Generally. For social security purposes, SSA records are evidence of the amounts of your earnings and the periods in which they were received.
(b) Before time limit ends. Before the time limit ends for a year, SSA records are evidence, but not conclusive evidence, of the amounts and periods of your earnings in that year.
(c) After time limit ends. After the time limit ends for a year—
1. (1) If SSA records show an entry of self-employment income or wages for an employer for a period in that year, our records are conclusive evidence of your self-employment income in that year or the wages paid to you by that employer and the periods in which they were received unless one of the exceptions in § 404.822 applies;
2. (2) If SSA records show no entry of wages for an employer for a period in that year, our records are conclusive evidence that no wages were paid to you by that employer in that period unless one of the exceptions in § 404.822 applies; and
3. (3) If SSA records show no entry of self-employment income for that year, our records are conclusive evidence that you did not receive self-employment income in that year unless the exception in § 404.822(b)(2) (i) or (iii) applies.