So, you are saying you can't calculate the interest rate using these parameters?
(3) Determination of annual percentage rate. For purposes of paragraph (a)(1)(i) of this section, a creditor shall determine the annual percentage rate for a closed- or open-end credit transaction based on the following:
(i) For a transaction in which the annual percentage rate will not vary during the term of the loan or credit plan, the interest rate in effect as of the date the interest rate for the transaction is set;
(ii) For a transaction in which the interest rate may vary during the term of the loan or credit plan in accordance with an index, the interest rate that results from adding the maximum margin permitted at any time during the term of the loan or credit plan to the value of the index rate in effect as of the date the interest rate for the transaction is set, or the introductory interest rate, whichever is greater; and
(iii) For a transaction in which the interest rate may or will vary during the term of the loan or credit plan, other than a transaction described in paragraph (a)(3)(ii) of this section, the maximum interest rate that may be imposed during the term of the loan or credit plan.
This is not saying that you have to determine the interest rate based on the above parameters and then figure out a new payment stream and then recalculate all the PPFC, etc. The interest rate based on these parameters is the APR for this specific purpose.
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