Debt-to-Income Ratio: How a Lender Sizes You Up

Your credit score tells a lender how reliably you have repaid in the past. Your debt-to-income ratio tells them whether you have room for another payment now. They are different questions, and a strong score does not compensate for a stretched DTI.

The calculation

DTI is your total monthly debt payments divided by your gross monthly income, expressed as a percentage. Gross means before tax and deductions, which is why the figure can look better than your bank balance feels.

Suppose your gross monthly income is $6,000 and your monthly obligations are:

• Rent or mortgage: $1,400
• Car loan: $380
• Student loan: $210
• Credit card minimums: $110

That is $2,100 in monthly debt payments. Divided by $6,000, your DTI is 35%.

What counts and what does not

Generally counted: mortgage or rent, car loans, student loans, personal loans, credit card minimum payments, and other recurring debt obligations.

Generally not counted: utilities, groceries, phone bills, insurance premiums, subscriptions and other living expenses that are not debt. This is why DTI is a poor measure of how much money you actually have spare, and it explains how someone can pass a DTI test and still be short every month.

Note that credit cards are counted at their minimum payment, not your typical spend. Someone who charges $2,000 a month and pays it in full may show a $40 minimum in the calculation.

There is no universal threshold

You will often see 43% quoted as a hard cap. Be careful with that figure. It comes from an older version of the federal qualified mortgage rule, and the CFPB's own current consumer guidance on DTI does not name a percentage. What it says instead is that different loan products and different lenders apply different limits.

So the honest answer is that DTI thresholds are set by the lender and the product, and there is no single number that means approved or declined. As rough orientation rather than rule: lower is better, the mid-30s and below is comfortable for most products, and the higher you go the more the rest of your application has to carry.

Some mortgage lenders also look at a front-end ratio, which counts only housing costs against income, alongside the full back-end ratio described above.

Why it constrains you more than you expect

DTI is a ratio, so it moves on either side. Two ways to improve it:

Reduce the numerator. Clear a debt entirely, and its whole payment leaves the calculation. This is where the ordering choice matters: paying off a small loan with a large monthly payment can improve DTI more than paying down a large balance with a small payment, even though the latter saves more interest. Those two goals genuinely conflict, and which one to prioritise depends on whether you are about to apply for something.

Increase the denominator. A raise or documented additional income helps, though lenders usually want a history for variable income rather than a single good month.

What does not help: moving debt around. Consolidating three payments into one lower payment can improve DTI, but consolidating without reducing the total payment does nothing to it.

The interaction people miss

Taking a new loan raises your DTI, which affects your ability to borrow later. A car loan taken this year is a mortgage application constrained next year. If a large borrowing decision is coming, the smaller borrowing decisions before it are not independent.

Work out your own figure with our budget planner, listing debt payments separately from living costs so you can see both the DTI a lender will calculate and the money you actually have left.

Sources

• CFPB: What is a debt-to-income ratio?
• CFPB: Loan options
• CFPB: What is a personal loan?

Current as of August 2026. Income and payment figures are illustrative. Lender DTI limits vary by product and are not standardised; confirm requirements with the lender before applying.