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twotall88 t1_iuho8jp wrote

>not necessarily the amount of your monthly payment

Debt-to-Income (DTI) is literally the ratio of total monthly payments (credit bureaus have the payment amounts) over your monthly gross income. https://www.consumerfinance.gov/ask-cfpb/what-is-a-debt-to-income-ratio-en-1791/

This would be the whole mortgage payment as both OP and brother are equally liable for the $1,000 payment.

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