(a) Interest rates. In order to prevent discrimination against State-chartered depository institutions, including insured savings banks, or insured branches of foreign banks, if the applicable rate prescribed in this section exceeds the rate such State bank or insured branch of a foreign bank would be permitted to charge in the absence of this paragraph (a), such State bank or insured branch of a foreign bank may, notwithstanding any State constitution or statute which is preempted by section 27 of the Federal Deposit Insurance Act, 12 U.S.C. 1831d, take, receive, reserve, and charge on any loan or discount made, or upon any note, bill of exchange, or other evidence of debt, interest at a rate of not more than 1 percent in excess of the rate on 90-day commercial paper or at the rate allowed by the laws of the State, territory, or district where the bank is located, whichever may be greater.

(b) Classes of institutions and loans. A State bank or insured branch of a foreign bank located in a State may charge interest at the maximum rate permitted to any State-chartered or licensed lending institution by the law of that State. If State law permits different interest charges on specified classes of loans, a State bank or insured branch of a foreign bank making such loans is subject only to the provisions of State law relating to that class of loans that are material to the determination of the permitted interest. For example, a State bank may lawfully charge the highest rate permitted to be charged by a State-licensed small loan company, without being so licensed, but subject to State law limitations on the size of loans made by small loan companies.

(c) Effect on State law definitions of interest. The definition of the term interest in this part does not change how interest is defined by the individual States or how the State definition of interest is used solely for purposes of State law. For example, if late fees are not interest under the State law of the State where a State bank is located but State law permits its most favored lender to charge late fees, then a State bank located in that State may charge late fees to its intrastate customers. The State bank also may charge late fees to its interstate customers because the fees are interest under the Federal definition of interest and an allowable charge under the State law of the State where the bank is located. However, the late fees would not be treated as interest for purposes of evaluating compliance with State usury limitations because State law excludes late fees when calculating the maximum interest that lending institutions may charge under those limitations.

(d) Corporate borrowers. A State bank or insured branch of a foreign bank located in a State whose State law denies the defense of usury to a corporate borrower may charge a corporate borrower any rate of interest agreed upon by the corporate borrower.

(e) Determination of interest permissible under section 27. Whether interest on a loan is permissible under section 27 of the Federal Deposit Insurance Act is determined as of the date the loan was made. Interest on a loan that is permissible under section 27 of the Federal Deposit Insurance Act shall not be affected by a change in State law, a change in the relevant commercial paper rate after the loan was made, or the sale, assignment, or other transfer of the loan, in whole or in part.