CO Code § 4-4.5-506 (2021)
2021 Colorado Code|Title 4 - Uniform Commercial Code|Article 4.5 - Funds Transfers|Part 5 - Miscellaneous Provisions|§ 4-4.5-506. Rate of Interest

  If, under this article, a receiving bank is obliged to pay interest with respect to a payment order issued to the bank, the amount payable may be determined (i) by agreement of the sender and receiving bank, or (ii) by a funds-transfer system rule if the payment order is transmitted through a funds-transfer system.    If the amount of interest is not determined by an agreement or rule as stated in subsection (a) of this section, the amount is calculated by multiplying the applicable federal funds rate by the amount on which interest is payable, and then multiplying the product by the number of days for which interest is payable. The applicable federal funds rate is the average of the federal funds rates published by the federal reserve bank of New York for each of the days for which interest is payable divided by three hundred sixty. The federal funds rate for any day on which a published rate is not available is the same as the published rate for the next preceding day for which there is a published rate. If a receiving bank that accepted a payment order is required to refund payment to the sender of the order because the funds transfer was not completed, but the failure to complete was not due to any fault by the bank, the interest payable is reduced by a percentage equal to the reserve requirement on deposits of the receiving bank.     History. Source: L. 90: Entire article added, p. 361, § 1, effective January 1, 1991.    OFFICIAL COMMENT   1. A receiving bank is required to pay interest on the amount of a payment order received by the bank in a number of situations. Sometimes the interest is payable to the sender and in other cases it is payable to either the originator or the beneficiary of the funds transfer. The relevant provisions are Section 4A-204(a), Section 4A-209(b)(3), Section 4A-210(b), Section 4A-305(a), Section 4A-402(d) and Section 4A-404(b). The rate of interest may be governed by a funds transfer system rule or by agreement as stated in subsection (a). If subsection (a) doesn't apply, the rate is determined under subsection (b). Subsection (b) is illustrated by the following example. A bank is obliged to pay interest on $1,000,000 for three days, July 3, July 4, and July 5. The published Fed Funds rate is .082 for July 3 and .081 for July 5. There is no published rate for July 4 because that day is not a banking day. The rate for July 3 applies to July 4. The applicable Fed Funds rate is .08167 (the average of .082, .082, and .081) divided by 360 which equals .0002268. The amount of interest payable is $1,000,000 X .0002268 X 3 = $680.40.   2. In some cases, interest is payable in spite of the fact that there is no fault by the receiving bank. The last sentence of subsection (b) applies to those cases. For example, a funds transfer might not be completed because the beneficiary's bank rejected the payment order issued to it by the originator's bank or an intermediary bank. Section 4A-402(c) provides that the originator is not obliged to pay its payment order and Section 4A-402(d) provides that the originator's bank must refund any payment received plus interest. The requirement to pay interest in this case is not based on fault by the originator's bank. Rather, it is based on restitution. Since the originator's bank had the use of the originator's money, it is required to pay the originator for the value of that use. The value of that use is not determined by multiplying the interest rate by the refundable amount because the originator's bank is required to deposit with the Federal Reserve a percentage of the bank's deposits as a reserve requirement. Since that deposit does not bear interest, the bank had use of the refundable amount reduced by a percentage equal to the reserve requirement. If the reserve requirement is 12%, the amount of interest payable by the bank under the formula stated in subsection (b) is reduced by 12%.