π Debt-to-Income Ratio Calculator
Your front-end and back-end DTI, judged against the rules lenders actually use.
Other Monthly Debts (minimum payments)
Back-End DTI (All Debts)
Estimates for planning only, not financial advice.
How to Use This Calculator
Enter your gross monthly income (before taxes and deductions), your total monthly housing payment including taxes and insurance, and the minimum payment on each other debt. The calculator returns your front-end DTI (housing only) and back-end DTI (everything), each with a plain-English verdict against lender benchmarks.
Enter your Gross Monthly Income. Use pre-tax pay; if you are salaried, divide your annual salary by 12 and add regular bonuses or side income.
Enter your full Monthly Housing Payment: principal and interest plus property tax, insurance, HOA, and PMI. Partial numbers understate your real ratio.
List every recurring debt minimum: car payment, credit card minimums (not the balance), student loans, personal loans, child support. Do not include utilities, groceries, or subscriptions; lenders do not count them.
Read both verdicts. If the back-end ratio is the problem, eliminating one whole payment moves the needle more than shaving balances.
What DTI Is and Why Lenders Obsess Over It
Your debt-to-income ratio answers the lender's core question: after existing obligations, is there enough income left for this new payment? Credit scores measure your history of paying; DTI measures your capacity to keep paying. A borrower with a perfect score but a 55 percent DTI is a default waiting for one bad month, and lenders price or decline accordingly. Because DTI uses gross income, it flatters everyone equally, which is why the thresholds are set where they are.
The 28/36 rule is the conventional mortgage benchmark: housing under 28 percent of gross income, all debts under 36 percent. It is a guideline, not a law, and strong applications regularly stretch it. The 43 percent line is different: under the qualified mortgage rule, exceeding 43 percent back-end DTI generally disqualifies a loan from QM status, so most lenders treat it as a ceiling. Government programs bend these rules: FHA can approve back-end ratios near 50 percent with compensating factors, and VA has no fixed cap.
Front-End vs. Back-End: Which One Binds You
Run both numbers, because the binding constraint surprises people. A $2,000 housing payment on $8,000 of income is a clean 25 percent front-end ratio, comfortably under 28. Add a $450 car payment, $120 in card minimums, and $350 in student loans, and the back-end ratio jumps to 36.5 percent, right at the edge. The housing looks affordable in isolation, but the total debt load says otherwise. This is the most common DTI failure pattern: not an expensive house, but expensive everything else.
How to Improve Your DTI
DTI counts monthly payments, not balances, so strategy matters more than brute force. Paying off a $2,000 card balance that carries a $120 minimum improves your ratio far more than paying $2,000 toward a student loan with the same minimum, because only the eliminated payment changes the math. Avoid financing anything new before a mortgage application, since even a small new payment counts in full. On the income side, a raise helps immediately, and a co-borrower adds their income to the denominator. One caution: lenders recompute DTI at closing, so keep debts frozen between pre-approval and closing day. That new furniture on credit can kill the loan.
Worked Example
Gross monthly income $8,000. Housing payment $2,000 (PITI). Car $450, credit card minimums $120, student loans $350, other debts $0. Front-end DTI = 2000 / 8000 = 25.0 percent, under the 28 percent benchmark: housing passes. Total monthly debts = 2000 + 450 + 120 + 350 = $2,920. Back-end DTI = 2920 / 8000 = 36.5 percent, a touch over the 36 percent benchmark but well under the 43 percent QM ceiling: workable, especially with good credit, but no room for another payment. Eliminating the $450 car payment would drop the back-end ratio to 30.9 percent, comfortably in the strong zone.
Estimates for planning only, not financial advice.
Frequently Asked Questions
What is a debt-to-income ratio?
Your debt-to-income ratio is the percentage of your gross monthly income that goes to debt payments. Lenders use it to judge whether you can handle another payment on top of what you already owe. There are two versions: front-end DTI covers housing costs only, and back-end DTI covers housing plus all other recurring debts like car loans, credit card minimums, and student loans.
What is a good debt-to-income ratio?
For mortgages, lenders like to see housing costs at or under 28 percent of gross income and all debts at or under 36 percent: the classic 28/36 rule. A back-end DTI under 36 percent is considered strong, 36 to 43 percent is workable with compensating strengths like great credit or large reserves, and above 43 percent you generally cannot get a qualified mortgage. For renting or auto loans, lower is always better, but thresholds are looser.
What is the difference between front-end and back-end DTI?
Front-end DTI, also called the housing ratio, divides your total monthly housing payment (principal, interest, taxes, insurance, HOA) by gross monthly income. Back-end DTI adds every other recurring monthly debt: car payments, credit card minimums, student loans, child support, and personal loans. A borrower can pass the front-end test but fail the back-end test if car and card payments are heavy, which is why lenders check both.
What is the 43 percent QM rule?
Under the Consumer Financial Protection Bureau's qualified mortgage rule, most mortgages cannot be issued to borrowers whose back-end DTI exceeds 43 percent. QM loans give lenders legal protection against borrower lawsuits claiming the loan was unaffordable, so the vast majority of lenders treat 43 percent as a hard ceiling. Some government programs like FHA and VA allow higher ratios with additional requirements.
Can I get a mortgage with a high DTI?
Sometimes. FHA loans can go to 50 percent or more back-end DTI with strong compensating factors, and VA loans have no hard DTI cap, though lenders still scrutinize ratios above 41 percent. But a high DTI approval is a warning, not a victory: it means one income disruption away from missed payments. Improving the ratio before you buy usually gets you a better rate and a safer payment.
How can I lower my debt-to-income ratio quickly?
The fastest lever is paying down debts with the smallest balances to eliminate whole monthly payments, because DTI counts payments, not balances. Next, avoid new debt and do not close old credit cards, which helps your credit score even though it does not change DTI. Raising income helps too: a raise, a side job, or adding a co-borrower all increase the denominator. Refinancing to a lower rate only helps DTI if it actually reduces the monthly payment.
Does DTI use gross or net income?
Lenders use gross monthly income: your pay before taxes, insurance, and retirement deductions. That means your DTI looks better than your real budget feels, because taxes take a big bite first. Run the calculator with gross income for the lender's view, but judge affordability for yourself against take-home pay: a 36 percent back-end DTI on gross income can easily be 50 percent of what actually hits your account.