How lenders measure DTI
Debt-to-income ratio compares your monthly debt payments with your gross monthly income, before tax. Lenders look at two versions. The front-end ratio includes only housing costs. The back-end ratio, the one people usually mean, includes housing plus all other required debt payments such as car loans, student loans and card minimums. Everyday bills like groceries and utilities do not count.
DTI = total monthly debt payments ÷ gross monthly income × 100
With $7,000 of gross income and $2,770 of debt payments, DTI is about 40%.
What counts as good
A common guideline is the 28/36 rule: housing under 28% and total debt under 36% of gross income. For mortgages, 43% has long been a key threshold for qualified mortgages, while some programs allow up to about 50% with strong credit or reserves. Lowering DTI before applying, by paying down a card or car loan, can improve the rate you are offered.
A worked example
With a gross income of $7,000 a month, a $1,900 housing payment, a $450 car loan, $300 of student loans and $120 of card minimums, the back-end ratio is about 40% and the front-end ratio about 27%. That front-end figure is inside the common 28% guideline, but the back-end ratio is above 36%, so some lenders would see the household as stretched.
Paying off the car loan would bring the back-end ratio down to about 33%, comfortably inside 36%. That is why clearing a smaller loan before applying for a mortgage can make a bigger difference than its balance suggests. Lenders also look at credit score, savings and job history, so a ratio is one part of the picture rather than a pass or fail. The debt-free date calculator shows how soon a loan could be cleared.
Common questions
Is a 40% debt-to-income ratio bad?
It is higher than the common 36% guideline and may limit some loan options, though many mortgage programs accept ratios in the low to mid 40s with good credit or savings.
What is a good debt-to-income ratio?
Under 36% is generally considered healthy; under 43% is acceptable to many mortgage lenders.
Does rent count in DTI?
For renters, lenders usually look at the proposed mortgage payment instead. For general budgeting, include rent.
How can I lower my DTI quickly?
Pay off small balances entirely to remove their payments, or increase income.
This calculator gives estimates for planning. Real returns, rates and prices change, so treat the result as a guide rather than a promise. Read how we build and check our calculators.