For the ATR requirements you will need to review the Commentary to 1026.43(c)(5)(ii). You basically have a 15 month balloon loan where the final payment is more than twice the regularly scheduled periodic payments that is due within the first 5 years of the first scheduled payment.
2. First five years after the date on which the first regular periodic payment will be due. Under § 1026.43(c)(5)(ii)(A)(1), the creditor must determine a consumer's ability to repay a loan with a balloon payment that is not a higher-priced covered transaction using the maximum payment scheduled during the first five years (60 months) after the date on which the first regular periodic payment will be due. To illustrate:
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The opinions expressed are mine and they are not to be taken as legal advice.