(A) A registrant may make open-end loans pursuant to an agreement between the registrant and the borrower whereby:

1. (1) The registrant may permit the borrower to obtain advances of money from the registrant from time to time or the registrant may advance money on behalf of the borrower from time to time as directed by the borrower.
2. (2) The amount of each advance and permitted interest, charges, and costs are debited to the borrower's account and payments and other credits are credited to the same account.
3. (3) The interest and charges are computed on the unpaid balance or balances of the account from time to time.
4. (4) The borrower has the privilege of paying the account in full at any time or, if the account is not in default, in installments of determinable amounts as provided in the agreement. For open-end loans, "billing cycle" means the time interval between periodic billing dates. A billing cycle shall be considered monthly if the closing date of the cycle is the same date each month or does not vary by more than four days from such date.

(B) Notwithstanding any other provisions of the Revised Code, a registrant may contract for and receive interest for open-end loans at a rate or rates not exceeding twenty-one per cent per year and may compute interest in each billing cycle by either of the following methods:

1. (1) By multiplying the daily rate by the daily unpaid balance of the account, in which case the daily rate is determined by dividing the annual rate by three hundred sixty-five;
2. (2) By multiplying the monthly rate by the average daily unpaid balance of the account in the billing cycle, in which case the average daily unpaid balance is the sum of all of the daily unpaid balances each day during the cycle divided by the number of days in the cycle. The monthly rate is determined by dividing the annual rate by twelve. The billing cycle shall be monthly and the unpaid balance on any day shall be determined by adding to any balance unpaid as of the beginning of that day all advances and permitted interest, charges, and costs and deducting all payments and other credits made or received that day.

(C) In addition to the interest permitted in division (B) of this section, a registrant may charge and receive or add to the unpaid balance any or all of the following:

1. (1) All charges and costs authorized by divisions (E), (F), (G), (H), (I), and (K) of section 1321.57 of the Revised Code;

2. (2) An annual credit line charge, for the privilege of maintaining a line of credit, as follows:

   1. (a) For the first year:

      1. (i) If the original credit line is less than five thousand dollars, an amount not exceeding one hundred fifty dollars;
      2. (ii) If the original credit line is at least five thousand dollars, an amount not exceeding the greater of one per cent of the original credit line or two hundred fifty dollars.
   2. (b) For subsequent years an amount not exceeding the greater of one-half per cent of the credit line on the anniversary date or fifty dollars.
3. (3) A default charge on any required minimum payment not paid in full within ten days after its due date. For this purpose, all required minimum payments are considered paid in the order in which they become due. The amount of the default charge shall not exceed the greater of five per cent of the required minimum payment or fifteen dollars.