12 U.S. Code § 4005 - Payment of interest
(a) In general
Except as provided in subsection (b) or (c) of this section and notwithstanding any other provision of law, interest shall accrue on funds deposited in an interest-bearing account at a depository institution beginning not later than the business day on which the depository institution receives provisional credit for such funds.
(b) Special rule for credit unions
Subsection (a) of this section shall not apply to an account at a depository institution described in section 461 (b)(1)(A)(iv) of this title if the depository institution—
(1) begins the accrual of interest or dividends at a later date than the date described in subsection (a) of this section with respect to all funds, including cash, deposited in such account; and