12 CFR §229.32

1. (a)Return of checks.
   1. (1)Subject to the requirement of expeditious return under paragraph (b) of this section, a returning bank may send a returned check to the depositary bank, to any other bank agreeing to handle the returned check, or as provided in paragraph (a)(2) of this section.
   2. (2)A returning bank that is unable to identify the depositary bank with respect to a check may send the returned check to any collecting bank that handled the returned check for forward collection if the returning bank was not a collecting bank with respect to the returned check, or to a prior collecting bank, if the returning bank was a collecting bank with respect to the returned check. A returning bank sending a returned check under this paragraph to a bank must advise the bank to which the returned check is sent that the returning bank is unable to identify the depositary bank.
   3. (3)A returning bank may convert a check to a qualified returned check. A qualified returned check shall be encoded in magnetic ink with the routing number of the depositary bank, the amount of the returned check, and a “2” in the case of an original check (or a “5” in the case of a substitute check) in position 44 of the qualified return MICR line as a return identifier. A qualified returned original check shall be encoded in accordance with ANS X9.13, and a qualified returned substitute check shall be encoded in accordance with ANS X9.100-140.
2. (b)Expeditious return of checks.
   1. (1)Except as provided in paragraph (c) of this section, a returning bank shall return a returned check in an expeditious manner such that the check would normally be received by the depositary bank not later than 2 p.m. (local time of the depositary bank) on the second business day following the banking day on which the check was presented to the paying bank.
   2. (2)If the second business day following the banking day on which the check was presented to the paying bank is not a banking day for the depositary bank, the returning bank satisfies the expeditious return requirement if it sends the returned check in a manner such that the depositary bank would normally receive the returned check not later than 2 p.m. (local time of the depositary bank) on the depositary bank's next banking day.
3. (c)Exceptions to the expeditious return of checks. The expeditious return requirement of paragraph (b) of this section does not apply if—
   1. (1)The check is deposited in a depositary bank that is not subject to subpart B of this part;
   2. (2)A paying bank is unable to identify the depositary bank with respect to the check; or
   3. (3)The bank handles a misrouted returned check pursuant to § 229.33(f).
4. (d)Notice in Lieu of Return. If a check is unavailable for return, the returning bank may send in its place a copy of the front and back of the returned check, or, if no such copy is available, a written notice of nonpayment containing the information specified in § 229.31(c). The copy or written notice shall clearly state that it constitutes a notice in lieu of return. A notice in lieu of return is considered a returned check subject to the requirements of this section and the other requirements of this subpart.
5. (e)Settlement. A returning bank shall settle with a bank sending a returned check to it for return by the same means that it settles or would settle with the sending bank for a check received for forward collection drawn on the depositary bank. This settlement is final when made.
6. (f)Charges. A returning bank may impose a charge on a bank sending a returned check for handling the returned check.
7. (g)Reliance on routing number. A returning bank may return a returned check based on any routing number designating the depositary bank appearing on the returned check in the depositary bank's indorsement or in magnetic ink on a qualified returned check.