​​​Pursuant to Wis. Stat. s. 422.421(1)(a), the administrator of the Wisconsin Consumer Act may approve indices for use by all credit grantors in connection with variable-rate consumer credit transactions. The indices listed below are approved for variable-rate consumer credit transactions.

1. The monthly average of weekly auction rates on U.S. Treasury Bills with a maturity of either three or six months is made available by the Federal Reserve Board (H.15).

2. The monthly average yield on U.S. Treasury securities adjusted to a constant maturity of one, two, three, or five years made available by the Federal Reserve Board (H.15).

3. The weekly average yield on U.S. Treasury securities adjusted to a constant maturity of one, two, three, or five years made available by the Federal Reserve Board (H.15).

4. The weekly or monthly bank prime loan rate (or averages of those rates), made available by the Federal Reserve Board (H.15) or as reported in the money rates listing in the Wall Street Journal.

5. The national average mortgage contract rate for major lenders on the purchase of previously occupied homes, as computed by the Federal Home Loan Bank Board.

6. The Quarterly Cost of all Funds Index for the State of Wisconsin as computed by the Federal Home Loan Bank Board.

7. The weekly average weighted yield of fixed-rate mortgages accepted under the Federal Home Loan Mortgage Corporation purchase program.

8. The one month, three months, six months, or one year London Interbank Offered Rates (LIBOR) as reported in the money rates listing in the Wall Street Journal.

9. The Federal Cost of Funds Index (COFI) made available by Freddie Mac on or about the 20th of each month at: https://www.freddiemac.com/research/datasets/cofi

10. The Secured Overnight Financing Rate (SOFR) as reported by the New York Federal Reserve Bank at: https://apps.newyorkfed.org/markets/autorates/SOFR