12 C.F.R. § 229.14
(a) In general. A depositary bank shall begin to accrue interest or dividends on funds deposited in an interest-bearing account not later than the business day on which the depositary bank receives credit for the funds. For the purposes of this section, the depositary bank may—
(b) Special rule for credit unions. Paragraph (a) of this section does not apply to any account at a bank described in § 229.2(e)(4), if the bank—