Your debt-to-income ratio (DTI) is one number that lenders look at before almost anything else: your total monthly debt payments divided by your gross monthly income (your income before taxes and deductions). It tells a lender how much of your paycheck is already spoken for, and therefore how much room you have to take on their loan.
A lower DTI means more breathing room and better odds of approval at a good rate. A high DTI signals that you’re stretched, and it’s a common reason mortgage applications get declined even when the credit score looks fine. Here’s how to calculate yours, what the benchmarks mean, and the fastest ways to bring it down.
How to calculate your DTI
The formula is simple:
DTI = total monthly debt payments / gross monthly income
Add up the required monthly payments on your debts, divide by your gross (pre-tax) monthly income, and multiply by 100 to get a percentage.
One point trips people up: DTI uses gross income, not take-home pay. Lenders standardize on the pre-tax number. If you’re used to thinking in terms of your actual paycheck, our take-home pay calculator shows the gap between gross and net for any US state - just remember DTI works off the gross figure at the top, not the net figure at the bottom.
Front-end vs back-end DTI
Lenders actually look at two versions:
- Front-end DTI counts only your housing payment - rent, or a mortgage plus property taxes and insurance - against your gross income.
- Back-end DTI counts all your monthly debt payments: housing plus car loans, student loans, minimum credit card payments, personal loans, and court-ordered payments like child support.
When people say “DTI” without specifying, they usually mean the back-end number, because it captures your full obligations. Both matter for a mortgage.
The 28/36 rule
A long-standing guideline, the 28/36 rule, gives a quick target:
- Keep your front-end (housing) DTI at or below 28% of gross income.
- Keep your back-end (total debt) DTI at or below 36% of gross income.
It’s a rule of thumb, not a law, but it’s a sensible ceiling for staying comfortable rather than stretched. Many lenders use it as a starting reference point.
What lenders actually accept
The 28/36 rule is conservative; real limits often run higher. For years, the federal Qualified Mortgage standard treated 43% back-end DTI as a common ceiling. In 2021 the Consumer Financial Protection Bureau replaced that strict 43% limit with an approach based on the loan’s pricing rather than a hard DTI cutoff. In practice, 43% is still a widely-cited guideline, and many loan programs approve higher DTIs - some government-backed loans stretch further when other factors, like a strong credit score or cash reserves, are healthy.
The takeaway: below about 36% is comfortable, the high 30s to low 40s is common and often approvable, and the higher you climb the fewer and pricier your options become. There’s no single magic number, but a lower ratio consistently earns better terms.
Worked example
Say your gross income is $6,000 a month, and your required monthly debt payments look like this (example numbers):
| Payment | Amount |
|---|---|
| Rent | $1,500 |
| Car loan | $400 |
| Student loan | $250 |
| Credit card minimums | $150 |
| Total debt payments | $2,300 |
- Back-end DTI = $2,300 / $6,000 = about 38.3%.
- Front-end DTI = $1,500 / $6,000 = 25%.
Your housing ratio (25%) is comfortably under 28. Your total ratio (38.3%) is over the 36% guideline but under the 43% benchmark - approvable with many lenders, though not with the most room to spare.
Now watch what one debt does. Pay off that $400 car loan and your total drops to $1,900. New back-end DTI = $1,900 / $6,000 = about 31.7% - a 6.6-point improvement from clearing a single payment. That’s why lenders care about your monthly payments, not just your total balances.
What counts and what doesn’t
DTI is about debt payments, not living expenses. Generally:
- Counted: mortgage or rent, car loans, student loans, minimum credit card payments, personal loans, and child support or alimony.
- Not counted: utilities, phone bills, groceries, health insurance premiums, streaming subscriptions, and taxes. These matter for your budget, but lenders don’t include them in DTI.
This distinction is why two people with the same income can have very different ratios - it’s the debt payments, not the lifestyle, that move the number.
How to lower your DTI
Because DTI is payments over income, you improve it by cutting monthly payments or raising income:
- Pay off a debt entirely. Eliminating a whole payment - as the car loan above showed - moves DTI more than shaving a little off several balances. Attack them in order with a method: see the debt avalanche vs snowball, and use the Debt Payoff Planner to see which payoff finishes soonest.
- Avoid new debt before you apply. Financing a car or opening a card in the months before a mortgage application raises your DTI at the worst possible time. Hold off on new borrowing while you’re being underwritten.
- Consider consolidation carefully. Replacing several payments with one lower payment can reduce your monthly obligations, though consolidation has its own trade-offs - check the total cost, not just the monthly figure.
- Increase gross income. A raise, a side income, or documented overtime raises the denominator. Lenders generally want income that’s stable and provable, not one-off.
Working backwards: how much payment can you qualify for?
You can run the DTI math in reverse to see how big a loan payment you can carry before a lender balks - handy before you start house-hunting.
Take the same $6,000 gross monthly income from above, and say your only debts are the car ($400), student loan ($250), and card minimums ($150) - $800 a month before any housing.
To stay at the comfortable 36% back-end ceiling, your total debt payments can be up to 36% of $6,000 = $2,160. Subtract the $800 you already owe, and about $1,360 is left for a housing payment:
| Step | Amount |
|---|---|
| 36% of $6,000 gross | $2,160 |
| Less existing non-housing debt | -$800 |
| Room for a housing payment | $1,360 |
That $1,360 is what a lender expects your full mortgage payment - principal, interest, property taxes, and insurance, often shortened to PITI - to fit inside. At $1,360, your front-end ratio is $1,360 / $6,000 = about 23%, comfortably under 28.
Push to the looser 43% back-end benchmark and the room grows: 43% of $6,000 = $2,580, minus $800 leaves about $1,780 for housing. But that lifts your front-end ratio to nearly 30%, so you’re trading comfort for a bigger loan. The lower target keeps more breathing room for everything DTI ignores - utilities, groceries, childcare, and saving.
Common mistakes that make your DTI look wrong
DTI is simple arithmetic, but a few errors trip people up, usually in the direction that makes their real ratio worse than they assumed:
- Forgetting the new loan payment counts. This is the big one for mortgages. When you apply, the lender drops your current rent and drops in the proposed new mortgage payment (PITI) instead, so your qualifying DTI is based on the future payment, not what you pay now. Plan around the payment you’re taking on, not the one you’re leaving behind.
- Using net income instead of gross. DTI runs on gross (pre-tax) income. Calculate it off your take-home pay and your ratio will look higher than the number a lender actually scores - our take-home pay calculator shows the gap.
- Counting the balance instead of the payment. Only the required monthly payment counts, not the full balance. A $10,000 loan with a $200 payment adds the same $200 to your DTI as a $3,000 loan with a $200 payment.
- Ignoring co-signed or guaranteed debt. If you co-signed someone else’s car or student loan, a lender can count that payment as yours - even if the other person actually makes it - because you’re legally on the hook for it.
- Leaving out debts that don’t feel like loans. Court-ordered payments like child support or alimony count too, even though no lender sends you a monthly statement for them.
Fix the inputs first, and the number you calculate will match the one underwriting sees.
FAQ
What’s a good debt-to-income ratio?
As a general guide, 36% or below is comfortable, the high 30s to low 40s is common and often approvable, and above roughly 43% starts to limit your options and raise your cost. Lower is always better for both approval odds and the rate you’re offered.
Does my credit card balance or my payment count in DTI?
Your minimum monthly payment counts, not the full balance. A $5,000 card balance with a $150 minimum adds $150 to your monthly debt total for DTI purposes. That said, a high balance still hurts your credit score through utilization, so it’s worth paying down for more than one reason.
Does DTI affect my credit score?
No - DTI isn’t part of your credit score at all, because scores don’t know your income. But lenders check DTI separately during underwriting, alongside your score. You can have an excellent score and still be turned down for a high DTI.
Should I use gross or net income?
Gross - your income before taxes and deductions. It’s the standard lenders use. Calculating DTI off your take-home pay would understate your income and make your ratio look worse than lenders will actually score it.
Sources
- Consumer Financial Protection Bureau - what is a debt-to-income ratio and why it matters (consumerfinance.gov)
- Consumer Financial Protection Bureau - Ability-to-Repay and Qualified Mortgage rule, on the 43% DTI standard and its 2021 replacement with price-based thresholds (consumerfinance.gov)
- Consumer Financial Protection Bureau - General QM Loan Definition final rule, confirming the 43% General QM DTI limit was removed and replaced with loan-pricing thresholds; when you apply for a mortgage, lenders base your qualifying DTI on the proposed new housing payment (PITI) (consumerfinance.gov)
- Example income and payments above are illustrative; calculate your own DTI from your actual gross income and required payments
- Last reviewed July 5, 2026. This guide is general education, not personalized financial advice.
