What Is a Good Debt-to-Income Ratio?

Debt-to-income is the number lenders lean on hardest, and the one borrowers understand least. It compares your monthly debt payments to your gross monthly income — and the detail that changes what you should do about it is that lenders count payments, not balances. That single fact makes some debt repayment enormously valuable before a mortgage application and some of it worthless.

The two ratios

Underwriters calculate DTI twice, and both have to pass. On a household earning $8,000 a month before tax:

• Front-end — the housing payment alone (principal, interest, taxes, insurance, and HOA where it applies) against gross income. At the traditional 28% ceiling, $2,240.
• Back-end — every monthly debt payment including housing. At the traditional 36% ceiling, $2,880; at the 43% figure most conventional lending treats as the practical limit, $3,440.

Whichever binds first sets your budget. With no other debt the housing ratio usually binds; with a car loan and student loans the back-end ratio takes over, often well before you reach the housing limit.

Payments, not balances

This is the part worth internalising. A $500 car payment counts as $500 whether the remaining balance is $22,000 or $2,000. Paying it down from $22,000 to $11,000 changes your DTI by nothing at all, because the payment is unchanged. Clearing it entirely removes $500 from the numerator.

At 6.5% over 30 years, $500 a month of payment supports about $79,100 of mortgage. So eliminating that car loan can add roughly $79,000 to what you can borrow — more than most people could add to a down payment in the same period, and available in a single transaction.

The corollary is that spare cash before a mortgage application should go to whichever debts it can finish, not to whichever is largest. Two small balances cleared beat one large balance halved, every time. Some programmes will also disregard an instalment loan with fewer than about ten payments left, which occasionally makes a nearly-finished loan free to ignore.

What counts and what does not

DTI counts recurring credit obligations, not the cost of living:

• Counted — mortgage or rent, car loans and leases, student loans, personal loans, minimum credit card payments, child support and alimony.
• Not counted — utilities, groceries, phone plans, insurance premiums, subscriptions, childcare, medical costs, and retirement contributions.

Two omissions are worth noticing, because they distort the picture in opposite directions. Childcare can rival a mortgage payment and is invisible to the ratio, so an approvable loan can still be unaffordable. And retirement contributions are excluded, so someone saving 15% looks identical to someone saving nothing.

Student loans are the common complication. Lenders generally use the payment on your statement, but treatment of income-driven plans — particularly a $0 payment — varies by loan programme, and some substitute a percentage of the balance instead. If you carry a large balance on a low payment, ask how a specific lender will treat it before assuming.

How the income side is verified

The denominator is not what you think you earn; it is what a lender can document. For salaried employees this is straightforward — pay stubs, W-2s, and often a verbal confirmation of employment shortly before closing, which is why changing jobs mid-application causes problems.

Variable and self-employed income is where applications stall. Bonus, commission and overtime generally need a two-year history and are averaged over it, so a strong recent year counts for less than it feels like it should. Self-employed borrowers are usually assessed on net income after business deductions, not on revenue — which produces the recurring frustration of aggressive tax deductions reducing borrowing power by far more than they saved in tax.

If you are self-employed and plan to buy within two years, that trade-off is worth making deliberately rather than discovering it during underwriting.

What counts as a good ratio

• At or below 36% — comfortable. You will qualify widely and keep room for a change of circumstances.
• 37% to 43% — workable, and where a great many approved borrowers sit. The margin is thin.
• Above 43% — harder. FHA loans stretch into the mid-40s and beyond with compensating factors such as strong reserves or a high credit score, but each step up narrows the field of lenders.

Approvable and comfortable are different questions. A payment at 43% of gross income can be perfectly serviceable on paper while leaving nothing for a job change or a new child, which is why borrowing below the limit rather than up to it is the standard advice from people who have watched the alternative.

How to move it before you apply

• Finish a debt rather than shrink several — the numerator only responds to payments that disappear.
• Do not open anything new. A car bought two months before applying can cost more borrowing power than the car is worth.
• Document income that already exists. Bonus, overtime and self-employment income often count with a two-year history, and borrowers frequently omit it.
• Avoid moving debt onto a longer term purely to shrink the payment. It works arithmetically, but it costs more interest and lenders can see the pattern.

Run your own number

Calculate both ratios and see which one binds in the debt-to-income calculator, then convert the result into an actual price in the home affordability calculator — and read the 28/36 rule in full for how lenders apply it. If clearing a debt is the lever, order the payoff in the debt payoff calculator.