Debt-to-Income Calculator
Enter your income and monthly debts to see your front-end and back-end DTI ratios — the key numbers lenders use to decide how much mortgage you can carry.
Income & Housing
Include mortgage, taxes, insurance, PMI, and HOA.
Other Debts
How DTI Is Calculated #
Your debt-to-income ratio measures how much of your gross monthly income goes toward debt payments. The formula is straightforward: divide your total monthly debt by your gross monthly income, then multiply by 100 to get a percentage. Lenders calculate two versions of this ratio when evaluating your mortgage application.
The front-end ratio (also called the housing ratio) considers only your monthly housing costs — mortgage principal and interest, property taxes, homeowner's insurance, HOA dues, and mortgage insurance. The back-end ratio adds all other recurring debt obligations on top of housing: car payments, student loans, credit card minimums, personal loans, child support, and alimony. The back-end ratio is the number most lenders focus on when making approval decisions.
Both ratios use your gross income — the amount you earn before taxes and deductions — not your take-home pay. If you earn a $96,000 annual salary, your gross monthly income is $8,000, regardless of what actually hits your bank account after withholding.
Front-End vs Back-End DTI #
The front-end ratio tells lenders whether your housing costs alone are manageable relative to your income. The traditional guideline for conventional loans is 28% or less — meaning your total housing payment should not exceed 28% of your gross monthly income. On a $96,000 salary ($8,000/month), that translates to a maximum housing payment of $2,240 per month.
The back-end ratio paints the full picture by including all debt obligations. Most lenders prefer this number below 36% for conventional loans, though automated underwriting systems like Fannie Mae's Desktop Underwriter can approve borrowers with back-end DTIs up to 50% when other factors — credit score, cash reserves, employment history — are strong. For an $8,000 monthly income, a 36% back-end DTI means your total monthly debt payments should stay below $2,880.
When the two ratios diverge significantly, it signals that non-housing debt is consuming a large share of income. A borrower with a 25% front-end ratio but a 45% back-end ratio, for example, has affordable housing but heavy consumer debt — a pattern lenders scrutinize carefully.
What Lenders Look For #
Different loan programs apply different DTI limits. Here are the standard thresholds lenders use:
| Loan Type | Front-End | Back-End |
|---|---|---|
| Conventional (manual) | 28% | 36% |
| Conventional (automated) | — | up to 50% |
| FHA | 31% | 43% |
| VA | none | 41% (guideline) |
| USDA | 29% | 41% |
These are guidelines, not hard rules. The CFPB's Qualified Mortgage rule no longer enforces a specific DTI cap — instead it uses a pricing-based test. However, 43% remains a widely used benchmark because it aligns with FHA's standard limit and represents a practical ceiling for most borrowers. Compensating factors like excellent credit (740+), large cash reserves (6+ months of payments), or a long employment history can help you qualify above these thresholds.
How to Lower Your DTI #
If your DTI is higher than you'd like, there are two levers: reduce debt or increase income. On the debt side, paying down credit cards is usually the fastest win — eliminating a $200 minimum payment instantly lowers your DTI, and unlike installment loans, revolving balances can be paid off quickly. Avoid opening new credit accounts in the months before applying for a mortgage, as new obligations raise your ratio.
On the income side, a raise, promotion, or documented side income can improve your DTI. Adding a co-borrower (such as a spouse) combines both incomes in the denominator, which can meaningfully lower the ratio. If your housing costs are the primary driver, consider a less expensive home, a larger down payment to reduce the loan amount, or a longer loan term (30 years vs 15) to lower the monthly payment.
One often-overlooked strategy: check your credit reports for errors. If a closed account still shows a balance or a debt that isn't yours appears on the report, correcting the error removes that payment from your DTI calculation entirely.
How Much Mortgage Can I Qualify For? #
Your DTI ratio directly determines the maximum mortgage a lender will approve. To estimate your qualifying amount, start with your gross monthly income, subtract your existing monthly debts, and calculate the maximum housing payment that keeps your back-end DTI at or below 43% (a common threshold).
For example, on a $96,000 salary ($8,000/month gross) with $500 in existing monthly debts, a 43% back-end DTI allows up to $2,940 for total housing costs. After subtracting estimated taxes (~$400) and insurance (~$125), about $2,415 remains for principal and interest — supporting a loan of roughly $365,000 at 6.5% over 30 years, or a home price of approximately $455,000 with 20% down.
Key factors that shift your qualifying amount:
- Existing debts: Every $100 in monthly debt reduces your qualifying mortgage by approximately $15,000–$18,000. Paying off a $300/month car loan can add $45,000+ to your approved loan amount.
- Interest rate: Lower rates increase your qualifying amount because the same monthly payment supports a larger principal. A 0.5% rate drop adds roughly $20,000 in buying power on a 30-year loan.
- Loan program: FHA allows 43% back-end DTI as standard. VA loans use a 41% guideline but have no hard cap. Conventional automated underwriting can approve up to 50% with strong compensating factors.
- Credit score: Higher scores unlock better rates (lower DTI for same payment) and more flexible approval criteria.
Use our Home Affordability Calculator to translate your DTI into a specific home price, or enter your debts above to see exactly where you stand.
Frequently Asked Questions #
What is a debt-to-income ratio?
Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward monthly debt payments. Lenders use two versions: front-end DTI (housing costs only) and back-end DTI (all debts combined). A lower DTI signals to lenders that you can comfortably take on a mortgage payment.
What DTI ratio do I need to qualify for a mortgage?
Most conventional lenders prefer a back-end DTI below 36%, though automated underwriting systems may approve up to 50% with strong compensating factors. FHA loans allow up to 43% back-end DTI as standard, and VA loans use a 41% guideline without a hard cap. For the front-end (housing) ratio, conventional guidelines target 28% or less.
What counts as debt in a DTI calculation?
Monthly debt includes minimum payments on credit cards, auto loans, student loans, personal loans, child support, alimony, and your housing payment (mortgage principal, interest, taxes, insurance, HOA, and PMI). Utilities, subscriptions, groceries, health insurance premiums, and childcare costs are not included.
What counts as income in a DTI calculation?
DTI uses gross (pre-tax) monthly income from all verifiable sources: salary, wages, overtime, bonuses, commissions, self-employment income, rental income, Social Security, pension, disability, and alimony or child support received. Lenders typically require a two-year history for variable income sources like overtime or self-employment.
How much mortgage can I qualify for with my DTI?
Your qualifying amount depends on gross income, existing debts, and the lender's DTI cap. At 43% back-end DTI (a common threshold), a $96,000 salary ($8,000/month) with $500 in existing debts supports roughly $2,940 in total housing costs — enough for a $365,000 loan at 6.5% over 30 years. Lower your debts or increase income to qualify for more. Use our Home Affordability Calculator for a detailed breakdown.
How can I lower my DTI before applying for a mortgage?
The fastest way to lower your DTI is to pay down revolving debt like credit cards — eliminating a minimum payment directly reduces your ratio. Avoid opening new credit accounts before applying. You can also increase your income through a raise, second job, or by adding a co-borrower. If your housing costs are the main driver, consider a less expensive home, a larger down payment, or a longer loan term to reduce the monthly payment.