Interest-only loans in the ability-to-repay calculation

An interest-only mortgage can have low scheduled payments during its initial period because those payments cover interest without reducing principal. When the loan recasts, principal repayment begins over a shorter remaining term. Regulation Z’s ability-to-repay framework addresses that payment shock by requiring a qualifying payment calculation that reflects repayment of principal and interest rather than relying solely on the initial interest-only amount.

The recast payment matters

For an interest-only or other non-standard mortgage covered by §1026.43(d), the creditor generally evaluates the consumer’s ability to repay based on a substantially equal monthly principal-and-interest payment that would repay the loan amount over the loan term remaining as of the recast date. For an adjustable-rate loan, the applicable fully indexed rate or introductory rate—whichever is greater under the rule—may be relevant to the calculation. The creditor must follow the detailed rule and official commentary for the specific loan terms.

Why the initial payment is not enough

A borrower may be able to afford a small payment that covers interest, yet be unable to afford the later payment that begins reducing principal. If underwriting ignores the recast, it can understate the long-term payment obligation. The ATR rule requires consideration of repayment capacity under its prescribed assumptions; a loan is not made affordable simply because the first payment is low.

Separate the loan feature from the ATR rule

An interest-only feature describes how scheduled payments are structured for a period. The ATR rule determines how a covered creditor must assess repayment ability. Coverage exceptions, qualified-mortgage provisions, refinancing treatment, and loan-specific facts can affect the analysis. Do not assume every loan is subject to identical calculations or that every interest-only loan is prohibited.

Calculation workflow

1. Determine whether the transaction is covered by §1026.43 and whether an exception applies.
2. Identify the interest-only period, recast date, loan balance, and remaining term.
3. Apply the rate assumption required for the loan type, including ARM rules where relevant.
4. Calculate a substantially equal principal-and-interest payment that repays the balance over the remaining term.
5. Evaluate that payment with the other required debt, income, and financial-obligation factors.

The exam distinction is between the contractual introductory payment and the ATR qualifying payment. For a covered interest-only mortgage, the ability-to-repay analysis accounts for the later principal-and-interest payment under the regulation’s prescribed method.