On January 18, 2023, in a Federal Register Notice (FRN), U.S. Customs and Border Protection (CBP) announced that the “quarterly Internal Revenue Service [IRS] interest rates used to calculate interest on overdue accounts (underpayments) and refunds (overpayments) of customs duties will increase from the previous quarter.”
For overpayments, the interest rates will be 6% for corporations, and 7% for non-corporations. For underpayments, the interest rates will be 7% for both corporations and non-corporations. The rates are applicable as of January 1, 2023.
The FRN can be found here: