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Debt Impact on Mortgage Calculator
Your existing debt directly reduces how much mortgage you can qualify for. Find out if your current debt load will prevent you from buying your target home — and what to do about it.
Educational calculators — always consult a licensed professional before making financial decisions.
Before taxes. Include all income sources.
Car loans, student loans, credit card minimums, personal loans. Exclude current rent.
Enter the purchase price you're targeting.
Amount or percentage of home price.
Use current market rates or a quote from your lender.
Max Affordable Home Price (36% DTI)
$372,939
Based on conventional lending guidelines
Proposed Back-End DTI
38.3%
Estimates based on 30-year P&I only. Actual qualification depends on full PITI, credit score, assets, and lender guidelines. Consult a licensed mortgage professional.
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What you'll need
- ·Gross monthly income
- ·Total existing monthly debt payments
- ·Target home price and down payment
- ·Expected mortgage interest rate
What you'll get
- ✓Max affordable home price — Given your current debt load
- ✓DTI with proposed mortgage — See if you qualify
- ✓Debt reduction needed — How much to pay off to qualify
- ✓Qualification assessment — 36% and 43% DTI check
How it works
Enter your income and debts
Input gross monthly income and all minimum monthly debt payments.
Add proposed mortgage
Enter the target home price and expected loan terms.
See DTI impact
Receive front-end and back-end DTI ratios and how much mortgage you can qualify for.
DTI Limits by Loan Type
| Loan Type | Front-End DTI | Back-End DTI |
|---|---|---|
| Conventional | 28% | 36–43% |
| FHA | 31% | 43–50% |
| VA | No limit | 41% |
| USDA | 29% | 41% |
Lower DTI = better mortgage terms and easier qualification.
State guides
How this varies by state
Property taxes, insurance costs, first-time buyer programs, and closing costs differ significantly across states. See local data for your state.
California
Texas
Florida
New York
Illinois
Pennsylvania
Ohio
Georgia
North Carolina
Michigan
New Jersey
Virginia
Washington
Arizona
Colorado
Tennessee
About this calculator
How does existing debt affect my mortgage approval?+
Existing debt raises your debt-to-income ratio, reducing how much mortgage you can qualify for. Each $100 in monthly debt payments reduces your maximum mortgage by roughly $15,000–$20,000. Paying off debt before applying can significantly increase your purchasing power.
Should I pay off debt before buying a house?+
It depends on your DTI and the interest rates. If your current debt pushes your DTI over 43%, paying it off may be necessary to qualify. Even if you qualify, reducing debt before buying frees up monthly cash flow for homeownership costs like maintenance and utilities.
What debts count against my DTI for a mortgage?+
Lenders include all monthly minimum payments on revolving debt (credit cards), installment loans (auto, student, personal loans), alimony, child support, and other court-ordered payments. They typically exclude utilities, insurance, cell phone, and subscriptions.
How much does paying off a car loan improve my mortgage qualification?+
A $500/month car payment raises your back-end DTI by about 6% on a $100,000 income — enough to push many borrowers over lender limits. Paying it off could increase your maximum mortgage by $60,000–$80,000. If you're close to qualifying, eliminating a car payment is often the fastest way to improve your position.
Can I use a co-borrower to offset my debt load?+
Yes — adding a co-borrower (like a spouse or partner) combines both incomes and both debt loads. If your co-borrower's income outweighs their debts, it can significantly lower your combined DTI. However, both borrowers' credit scores also factor in, so a co-borrower with lower credit could raise your rate.
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Debt Impact Calculator is built and maintained by the RealCostIQ editorial team. Cost ranges and rates are checked against published industry data and contractor quotes, and revised when the underlying figures move. Read our data methodology or more about who builds this. Every calculation runs in your browser — no account, and none of your inputs are stored.
Cost ranges and rates here are checked against contractor quotes and published industry data. If a number still looks off, email Support@RealCostIQ.com and we'll review and fix it.