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.

A worked calculation

DTI is monthly debt payments divided by gross monthly income. Here is a household earning $7,000 a month before tax.

Counted obligations total $2,700. Against $7,000 of gross income that is a DTI of about 38.6%.

Two features of this surprise people. First, most of what feels like a bill does not count: living costs are excluded entirely. Second, only the credit card minimum counts, not what you actually pay. Someone paying $800 a month against cards to clear them faster is assessed on the $150 minimum.

Front-end and back-end

Mortgage lenders usually calculate two ratios rather than one.

In the example above the front-end ratio is $1,850 divided by $7,000, about 26.4%, while the back-end is 38.6%. A borrower can pass one and fail the other, and the back-end ratio is usually the binding constraint because it captures existing debt.

If you are being told your income supports a smaller mortgage than you expected, the car loan and the student loan are typically why.

There is no universal cutoff, but there are common bands

Different loan programmes and lenders set their own limits, and compensating factors such as a large deposit, substantial reserves, or a strong credit history can push an approval through a higher ratio. As a rough orientation rather than a rule:

• Below about 36% is generally comfortable across most products
• 36% to 43% is workable for many programmes, sometimes with conditions
• Above 43% narrows the options considerably, though it is not automatically disqualifying
• Above 50% is difficult for most mainstream lending

Treat these as terrain rather than thresholds. There is no number at which you are guaranteed an approval, and no number at which you are guaranteed a refusal.

Why it constrains you more than the arithmetic suggests

DTI uses gross income, but you repay debt from net income. On a 38.6% gross DTI, the share of take-home pay going to debt is materially higher — often close to half once tax and payroll deductions are accounted for.

This is why a loan a lender approves can still be uncomfortable to live with. The lender is testing whether you are likely to repay; it is not testing whether the remainder leaves you room to save, absorb a surprise, or take a pay cut. That assessment is yours to make, and the honest version uses net income.

Build your own version with our budget planner, which works from what actually arrives in your account.

How to lower it before applying

DTI responds to two things: the payments counted, and the income they are measured against. In rough order of speed:

1. Clear a small instalment loan entirely. Removing a $410 car payment cuts the ratio above from 38.6% to 32.7% in one step. Paying the same loan down without clearing it changes nothing, because the monthly payment is what counts.
2. Pay off credit card balances, which removes the minimum from the calculation.
3. Avoid new debt in the months before applying. A car financed shortly before a mortgage application can reduce your borrowing capacity by far more than the car costs.
4. Document all income, including consistent bonus, overtime, or self-employment income, which lenders will often count with sufficient history.
5. Extend a term on an existing loan to lower its payment. This lowers DTI and raises total interest, so it is a trade rather than a win.

The first point is the one worth internalising. For DTI purposes, a loan with two payments remaining is as expensive as one with forty. Clearing small balances entirely does far more than reducing several large ones.

The interaction people miss

DTI and credit utilisation both look at debt, and they respond to opposite actions in one specific case.

Consolidating card balances into a personal loan generally lowers utilisation, because the revolving balances go to zero, while raising or holding DTI, because the loan has a required monthly payment where the cards had a smaller minimum.

Which matters depends on what you are applying for and when. If a mortgage application is imminent, the DTI effect is usually the binding one. See credit utilisation explained for the other side of that trade.

Where the income figure comes from

Lenders do not simply take your word for income, and what they count may differ from what you earn.

The self-employment row causes the most surprise. Deducting aggressively to reduce a tax bill also reduces the income a lender will recognise, which can shrink borrowing capacity substantially. If a mortgage application is planned, that trade is worth considering a year or two ahead.

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.