The mortgage amount you can qualify for depends primarily on your income, your existing debts, and your credit score. Most lenders use a simple ratio: your total monthly debt payments (including the new mortgage) should stay at or below 43% to 50% of your gross monthly income. For someone earning $80,000 a year with no other debts, that typically translates to a mortgage somewhere in the $300,000 to $400,000 range, though the exact number shifts significantly based on interest rates, property taxes, and the loan program you choose.
How Lenders Calculate Your Limit
The core math behind mortgage qualification is your debt-to-income ratio, or DTI. This is the percentage of your gross monthly income (before taxes) that goes toward debt payments. Lenders look at two versions of this number.
The front-end ratio counts only your housing costs: mortgage principal, interest, property taxes, and homeowners insurance (often called PITI). Most lenders want this at or below 28% to 31% of your gross income.
The back-end ratio adds in all your other monthly debt obligations: car payments, student loans, credit card minimums, and personal loans. This is the number that usually determines your ceiling. For conventional loans sold to Fannie Mae, the standard maximum back-end DTI is 36%, but borrowers with strong credit scores and cash reserves can qualify with ratios up to 45%. Loans run through Fannie Mae’s automated underwriting system can be approved with DTI ratios as high as 50%.
Running the Numbers Yourself
Start with your gross monthly income. If you earn $90,000 a year, that’s $7,500 per month. At a 43% DTI, your total monthly debt payments can’t exceed $3,225. If you’re already paying $400 a month on a car loan and $200 on student loans, that leaves $2,625 available for your total housing payment.
Your housing payment isn’t just the loan itself. Property taxes and homeowners insurance typically add about 21% on top of the mortgage payment, and in some markets those costs can reach a third or even half of the total bill. If you estimate $2,625 for total housing costs and roughly 20% of that goes to taxes and insurance, you’re left with about $2,100 for principal and interest on the loan.
At a 6.5% interest rate on a 30-year fixed mortgage, $2,100 per month in principal and interest supports a loan of roughly $330,000. At 7.5%, that same payment only covers about $300,000. The interest rate you receive makes a meaningful difference in how much house you can afford.
How Your Credit Score Affects the Answer
Your credit score doesn’t just determine whether you get approved. It directly controls what interest rate lenders offer, which in turn determines how large a loan the same monthly payment can support. Based on Consumer Financial Protection Bureau data from early 2025, a borrower with a 700 credit score shopping for a $400,000 home with 10% down could see rates ranging from about 5.875% to 8.125%. A borrower with a 625 score looking at the same property faced rates from 6.125% to 8.875%.
That gap might look small, but over a 30-year mortgage it’s enormous. On a $350,000 loan, the difference between a 6% rate and a 7.5% rate is roughly $370 per month. Flip that around and think of it from a qualification standpoint: at the lower rate, you could qualify for a significantly larger loan with the same income. Improving your credit score before applying is one of the most effective ways to increase the mortgage amount you qualify for.
Loan Program Differences
The type of mortgage you apply for changes the qualifying math. Each program has its own DTI limits and down payment requirements.
- Conventional loans follow Fannie Mae or Freddie Mac guidelines. The standard DTI cap is 36%, rising to 45% with compensating factors like a higher credit score or several months of mortgage payments in savings. Automated underwriting can approve DTI ratios up to 50%. You’ll typically need at least a 620 credit score, and a down payment as low as 3% is possible with private mortgage insurance.
- FHA loans are insured by the Federal Housing Administration and designed for borrowers with lower credit scores or smaller down payments. FHA allows DTI ratios up to 43%, and up to 50% in some cases. Minimum credit scores start at 580 for a 3.5% down payment. The trade-off is mandatory mortgage insurance for the life of most FHA loans, which adds to your monthly payment and reduces the loan amount you can qualify for.
- VA loans are available to eligible veterans, active-duty service members, and surviving spouses. The VA doesn’t set a hard DTI cap, though most lenders prefer to see 41% or less. VA loans require no down payment and no monthly mortgage insurance, which means more of your payment goes toward the loan itself. This often allows VA borrowers to qualify for a larger mortgage than they would with a conventional or FHA loan on the same income.
Conforming Loan Limits
Even if your income supports a large mortgage, there’s a cap on the loan size that qualifies for standard conventional financing. For 2026, the baseline conforming loan limit for a single-family home is $832,750. In higher-cost areas, the ceiling rises to $1,249,125. If you need to borrow more than these amounts, you’ll need a jumbo loan, which typically requires a larger down payment, a higher credit score, and more cash reserves.
These limits apply to the loan amount, not the purchase price. If you’re buying a $900,000 home and putting $100,000 down, your $800,000 loan still falls within the conforming limit.
What Counts as Income and Debt
Lenders count your gross income from all documented sources: salary, bonuses (if consistent over two years), commissions, rental income, self-employment profit, alimony, and retirement distributions. If you’re self-employed, expect lenders to average your net income from the past two years of tax returns, which often produces a lower qualifying income than what you actually take home.
On the debt side, lenders pull your credit report and add up every minimum monthly payment: auto loans, student loans, credit cards, personal loans, child support, and alimony. They don’t count utilities, groceries, subscriptions, or health insurance premiums. One important detail: even if you pay your credit card balance in full each month, the minimum payment shown on your credit report still counts toward your DTI.
Paying off a car loan or credit card balance before applying can directly increase the mortgage you qualify for, since it frees up room in your DTI calculation.
Down Payment and Its Ripple Effects
A larger down payment helps in three ways. First, you’re borrowing less, so the monthly payment is lower relative to your income. Second, putting down 20% or more on a conventional loan eliminates private mortgage insurance, which can run 0.5% to 1.5% of the loan amount per year. That savings means more of your allowable payment goes toward the mortgage itself. Third, a bigger down payment lowers your loan-to-value ratio, which can unlock better interest rates.
If you’re working with a smaller down payment, factor the cost of mortgage insurance into your qualification estimate. On a $350,000 loan, PMI at 0.8% adds about $233 per month to your housing costs, reducing the maximum loan your income can support.
Getting a Realistic Estimate
Online mortgage calculators give you a starting point, but they often underestimate total housing costs by ignoring property taxes, insurance, HOA fees, and mortgage insurance. For a more accurate picture, get a preapproval from a lender. During preapproval, the lender verifies your income, pulls your credit, and gives you a specific loan amount you’re approved for. This number carries weight with sellers and gives you a realistic budget.
Keep in mind that the maximum you qualify for and the amount you should borrow are two different things. Qualifying at a 50% DTI means half your gross income goes to debt, leaving a thin margin for savings, maintenance, and everything else. Many financial planners suggest keeping total housing costs closer to 25% to 30% of gross income for a more comfortable budget.