Mortgage & Loan Pre-Qualification
Debt-to-Income (DTI) Calculator
Find your DTI ratio before you apply for a mortgage or loan — see exactly where lenders will place you.
Lenders use your debt-to-income ratio — total monthly debt payments divided by gross monthly income — as one of the biggest factors in whether you qualify for a mortgage, and at what rate. Knowing this number before you apply means no surprises at underwriting, and tells you whether paying down a card or loan first would meaningfully help.
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Enter your income and debts
DTI ratio • Lender outlook
Frequently Asked Questions
What is a good debt-to-income ratio?
Most lenders consider a DTI below 36% strong, 36-43% acceptable for many mortgage programs, and above 43% difficult to qualify with for a conventional loan, though some government-backed programs allow higher ratios with compensating factors like a large down payment or high credit score.
What counts as debt in a DTI calculation?
Minimum monthly payments on credit cards, auto loans, student loans, personal loans, child support or alimony, and your current or proposed housing payment (mortgage or rent). It does not include utilities, groceries, insurance premiums, or other living expenses.
Is DTI calculated before or after tax?
DTI uses your gross monthly income (before taxes and deductions), not your take-home pay. This is different from a personal budget, which typically uses net income.
What is the difference between front-end and back-end DTI?
Front-end DTI only counts your housing payment against your income. Back-end DTI, which is what most lenders use to qualify you, counts your housing payment plus all other monthly debt obligations against your income.
How can I lower my DTI before applying for a mortgage?
Pay down or pay off smaller debts like credit cards and auto loans, avoid taking on new debt before applying, increase your income, or in some cases consolidate multiple debts into one lower monthly payment.
What This DTI Calculator Does
Your debt-to-income (DTI) ratio is one of the most important numbers in mortgage and loan qualification — often more consequential than your credit score alone. This calculator computes both your front-end and back-end DTI ratios from your gross monthly income and monthly debt obligations, then shows where you stand relative to conventional, FHA, VA, and USDA loan requirements.
How It Works
Front-End DTI = Monthly Housing Costs ÷ Gross Monthly Income
Back-End DTI = Total Monthly Debt Payments ÷ Gross Monthly Income
Monthly housing costs (PITI) include principal, interest, property taxes, homeowners insurance, and HOA fees. Total monthly debts add credit cards (minimums), auto loans, student loans, personal loans, and child support/alimony. Gross income is pre-tax — salary, self-employment income (2-year average), rental income, Social Security, and qualifying investment income.
Key Concepts Explained
Front-End vs. Back-End DTI
Front-end DTI measures housing costs only. Back-end includes all monthly debt obligations. Most lenders focus on back-end DTI. Conventional loans generally want back-end DTI below 43–45%; FHA allows up to 50% with compensating factors; VA loans apply a 41% guideline.
Compensating Factors
Lenders may approve DTIs above guidelines with: large down payment (20%+), substantial cash reserves (3–6 months of payments), excellent credit score (760+), stable long-term employment, or minimal payment shock (new payment close to current rent).
Qualifying Income for Self-Employed Borrowers
Lenders use a 2-year average of Schedule C net income after business deductions plus depreciation add-backs. This often significantly reduces qualifying income compared to gross revenue — a business owner with $200,000 revenue but $140,000 expenses qualifies on $60,000 of income.
Tips & Best Practices
- Pay off small installment loans before applying — eliminating a $150/month car loan payment (if near payoff) can add $30,000+ to your qualifying loan amount.
- Increase income documentation — if you have 2+ years of side income, rental income, or a second job, document it properly to lower effective DTI.
- Don't open new credit lines before or during the mortgage process — new auto loans or credit cards increase DTI and trigger hard inquiries.
- Run the numbers before home shopping — know your maximum qualifying loan amount based on DTI before falling in love with a house above your range.
- Consider a co-borrower — adding a spouse or co-buyer with income but limited debt can dramatically reduce DTI and expand your qualifying purchase price.
Frequently Asked Questions
What DTI do I need for a mortgage?
Conventional loans allow up to 45–50% back-end DTI with strong compensating factors; 43% is the common preferred ceiling. FHA allows up to 50% with compensating factors. VA loans have no official cap but lenders typically apply a 41% guideline. USDA requires below 41% housing and 45% total. Jumbo loans are stricter, often requiring below 38–43%.
Does rent count in DTI?
Your current rent payment is not included in DTI for mortgage qualification — lenders are replacing that payment with the new mortgage. However, if you're buying a second home while keeping your current residence, both housing payments are counted in back-end DTI.
How quickly can I lower my DTI?
The fastest path is paying off debts in full — eliminating a monthly payment immediately reduces DTI from the next payment cycle. Increasing income helps but requires documentation. Paying down balances reduces credit utilization (improving credit score) but doesn't reduce DTI unless you eliminate the minimum payment entirely.
Are student loans included in DTI?
Yes. For conventional loans, if student loans are in income-driven repayment with a $0 payment, lenders typically count 0.5–1% of the outstanding balance as a monthly payment. FHA requires the greater of 1% of balance or actual IDR payment. This can significantly impact DTI for borrowers with large federal loan balances.
Related Calculators
Use the Mortgage Calculator to estimate PITI and see how loan amounts affect front-end DTI. The Home Affordability Calculator works backwards from your income and DTI limit to find maximum purchase price. The Debt Payoff Calculator shows the fastest debt elimination strategy before applying.