Debt-to-Income Ratio Shows How Much Pay Is Already Promised
Declined. The mortgage software never questioned the salary — it flagged that 48 cents of every gross dollar was already promised to other lenders.
Debt-to-income ratio, or DTI, compares your required monthly debt payments with your gross monthly income. Lenders read it as a quick gauge of how much new payment your paycheck can still carry.
How to run the numbers
Add up required payments — loans, card minimums, leases — and divide by gross monthly income. If payments total $1,500 against $6,000 of gross pay, your DTI is 25%.
Now price in a mortgage that adds $1,800 a month. Debt service becomes $3,300, the ratio jumps to 55%, and most lenders read that as serious strain.
Front-end, back-end, and 28/36
Mortgage lenders often split the measure in two. The front-end ratio counts housing costs alone, while the back-end ratio adds every other required debt payment on top.
The classic 28/36 guideline wants housing under 28% of gross income and total debt under 36%. Plenty of loans get approved above those lines, but pricing and scrutiny tighten as the ratio climbs.
What lenders read into it
A low DTI says your income isn't already spoken for, which matters as much as payment history when you apply for a mortgage. Your credit score tells lenders how you've handled debt; DTI tells them how much more you can hold.
You can move the number from either end. Paying off an installment loan trims the top; a raise or documented side income grows the bottom.
What the ratio can't see
DTI counts required debt payments, not life. Groceries, utilities, child care, taxes, and savings goals never enter the formula, so a ratio a lender accepts can still be a budget you can't live with.
It also leans on minimums. Carrying a card balance at the minimum payment keeps the ratio looking calm while interest quietly compounds the real load.
The CFPB's debt-to-income ratio guide walks through the calculation with examples.
Tonight, total your required payments and divide by gross pay — know your number before a lender quotes it back to you.