How much you can borrow for a mortgage depends primarily on your income, your existing debts, your credit score, and the loan program you choose. Most lenders use a simple ratio: your total monthly debt payments (including the new mortgage) generally cannot exceed 50% of your gross monthly income. For someone earning $80,000 a year with no other debts, that could mean qualifying for roughly $350,000 to $450,000, depending on interest rates, property taxes, and insurance costs in your area.
How Lenders Calculate Your Borrowing Limit
The central number in any mortgage qualification is your debt-to-income ratio, or DTI. This compares your total monthly debt payments to your gross monthly income (before taxes). Lenders look at two versions of this ratio. The front-end ratio covers only your housing costs: the mortgage payment itself plus property taxes, homeowners insurance, and any HOA dues. The back-end ratio adds in everything else you owe monthly, such as car loans, student loans, credit card minimums, and personal loans.
For conventional loans backed by Fannie Mae, the standard back-end DTI cap is 36%. Borrowers with strong credit scores and cash reserves can qualify with a DTI up to 45%. If your loan is run through Fannie Mae’s automated underwriting system (which most are), the ceiling stretches to 50%. FHA loans are similarly flexible, often allowing DTIs up to 50% for borrowers with compensating factors like a larger down payment or significant savings.
Here’s what that looks like in practice. Say your gross monthly income is $7,000 (about $84,000 a year) and you have a $400 car payment and $200 in minimum credit card payments. At a 45% DTI, your total allowable monthly debt is $3,150. Subtract the $600 you already owe, and you have $2,550 left for housing costs. That $2,550 has to cover not just the loan payment but also property taxes, insurance, and any HOA fees, so the actual loan amount you qualify for will be lower than if that full $2,550 went toward principal and interest alone.
What Counts as “Housing Costs” in the Calculation
Lenders don’t just look at your mortgage payment. They qualify you based on what the industry calls PITIA: principal, interest, taxes, insurance, and association dues. Property taxes and homeowners insurance can easily add $300 to $800 per month depending on where you live and the value of the home. If the property has an HOA, those dues count too. Private mortgage insurance (PMI), required when you put down less than 20%, also gets added to your monthly housing figure.
If you currently own a home and are buying a new one before selling, both housing payments count against your DTI until the existing home closes with a title transfer. This can significantly reduce how much you qualify to borrow on the new purchase, so timing your sale matters.
How Your Credit Score Affects Borrowing Power
Your credit score doesn’t directly change how much a lender will let you borrow, but it changes the interest rate you’ll pay, which in turn changes how much home you can afford within the same monthly payment. The difference is meaningful. On a $350,000 loan, a borrower with a 620 credit score might see a 30-year rate around 7.59%, producing a monthly principal-and-interest payment of roughly $2,469. A borrower with a 780 or higher score could get a rate near 6.81%, dropping that payment to about $2,284. That $185 monthly difference adds up to over $66,000 in extra interest over the life of the loan.
More importantly for borrowing capacity, a lower rate means more of each dollar goes toward principal rather than interest. With the same income and DTI limit, the borrower with better credit qualifies for a larger loan amount because the monthly payment per dollar borrowed is smaller. Scores above 760 typically unlock the best available rates. Below 620, most conventional lenders won’t approve a loan at all, though FHA loans accept scores as low as 500 with a larger down payment.
Conforming Loan Limits
Even if your income supports a large mortgage, there’s a cap on how much you can borrow through a standard conventional loan. For 2026, the conforming loan limit for a single-family home is $832,750 in most of the country. In designated high-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 higher credit score, a larger down payment, and more cash reserves.
These limits apply per property, not per borrower. If you’re buying a multi-unit property (a duplex, triplex, or fourplex) that you’ll live in, the conforming limits are higher than the single-family figures.
How Lenders Verify Your Income
What you earn on paper and what a lender counts as qualifying income can be two different numbers, especially if your pay varies. For W-2 employees with a steady salary, documentation is straightforward: pay stubs from the last two months and W-2 forms from the past two years. If you’ve recently changed jobs but stayed in the same field at similar or higher pay, most lenders will still qualify you without issue.
Self-employed borrowers, freelancers, and commission-based workers face more scrutiny. Lenders typically require two years of personal and business tax returns, profit and loss statements, and any 1099 forms. They average your net income (after business deductions) over those two years. This is where many self-employed borrowers hit a wall: aggressive tax write-offs lower your taxable income, which lowers the income a lender can use to qualify you. A freelancer who grosses $150,000 but reports $80,000 after deductions will be qualified on the $80,000 figure.
Overtime, bonuses, and part-time income generally count only if you have a two-year history of receiving them. Rental income from investment properties you own can also be included, though lenders usually count only 75% of it to account for vacancies and maintenance.
A Quick Way to Estimate Your Range
For a rough starting point, multiply your gross annual income by 3.5 to 4.5. That range reflects what most borrowers with moderate debt and average credit can expect to qualify for. Someone earning $100,000 a year with minimal other debts might qualify for $350,000 to $450,000. A dual-income household bringing in $150,000 could reach $525,000 to $675,000.
To narrow that estimate, tally your current monthly debt payments and subtract them from your allowable total. Use 43% to 45% of your gross monthly income as a reasonable DTI target for the total. Then check current mortgage rates for your credit score range. An online mortgage calculator can convert the remaining monthly housing budget into a loan amount at that rate. The result will be closer to what a lender would actually approve than any rule-of-thumb multiplier.
What Increases or Decreases Your Limit
Several factors push your borrowing capacity up or down beyond the basics of income and debt. A larger down payment doesn’t directly raise the amount a lender will approve, but it reduces the loan size needed for the same purchase price, and it can eliminate PMI, freeing up more of your monthly budget for the mortgage itself. Cash reserves (savings left over after closing) can help you qualify at a higher DTI, since lenders view them as a safety net.
On the other side, things that reduce your borrowing power include co-signed loans (even if someone else makes the payments, the debt appears on your credit report), child support or alimony obligations, and high property tax areas where a larger chunk of your housing budget goes to taxes rather than the loan. Student loans in deferment or income-driven repayment still count, typically at 0.5% to 1% of the outstanding balance as a monthly obligation.
Getting preapproved before house shopping gives you a concrete number rather than an estimate. The lender will pull your credit, verify your income and assets, and issue a letter stating the maximum loan amount you qualify for. That letter also signals to sellers that you’re a serious buyer, which can matter in competitive markets.