The size of your mortgage comes down to two things: how much income lenders count and how much debt they see on your credit report. Improving either side of that equation, or both, directly increases the loan amount you can qualify for. Here are the most effective strategies to push your borrowing power higher.
Understand Your Debt-to-Income Ratio
Your debt-to-income ratio (DTI) is the single biggest lever controlling your mortgage size. It compares your total monthly debt payments to your gross monthly income. Lenders use it to decide how large a payment you can handle.
For conventional loans run through Fannie Mae’s automated underwriting system, the maximum allowable DTI is 50%. That means if you earn $10,000 per month before taxes, your total monthly obligations, including the new mortgage payment, car loans, student loans, minimum credit card payments, and any other recurring debt, can’t exceed $5,000. Manually underwritten conventional loans cap at 36%, with exceptions up to 45% for borrowers with strong credit scores and cash reserves.
FHA loans generally allow DTI ratios up to 43%, sometimes higher with compensating factors like a large down payment or significant savings. The takeaway: every dollar of monthly debt you eliminate frees up room for a bigger mortgage payment, and every dollar of qualifying income you add does the same thing.
Pay Down or Restructure Existing Debt
Reducing your monthly debt obligations is often the fastest way to qualify for more. A $400 car payment that disappears from your credit report could translate into roughly $400 more in mortgage payment you qualify for, which at current rates might mean $60,000 to $70,000 in additional borrowing capacity.
Focus on debts with monthly payments, not just balances. Paying off a credit card with a $200 minimum payment helps more than paying down a $15,000 loan that only carries a $150 monthly obligation. If you can’t pay something off entirely, consider refinancing a high-payment loan into a longer term to shrink the monthly number. The goal isn’t necessarily to owe less in total; it’s to lower the monthly figure that shows up in your DTI calculation.
Student loans deserve special attention because lenders calculate them differently depending on your loan program. If your student loans are in deferment or forbearance and show a $0 monthly payment, lenders don’t just ignore them. Freddie Mac, FHA, and USDA loans use 0.5% of the outstanding balance as your assumed monthly payment. Fannie Mae uses either 1% of the balance or one monthly payment, whichever applies. VA loans use 5% of the balance divided by 12 months. On a $50,000 student loan balance, that’s anywhere from $208 to $417 per month counted against you, even though you’re not actually paying anything right now. Enrolling in an income-driven repayment plan that produces a documented lower monthly payment can reduce the number lenders use.
Increase Your Qualifying Income
The other side of the DTI fraction is income, and lenders are more flexible about what counts than many borrowers realize. The catch is documentation: you generally need a two-year history of any secondary income for it to qualify, and it must appear on your tax returns.
Bonuses and commissions count if you’ve received them consistently for at least two years. Lenders typically average the last 24 months. If your bonus was $10,000 one year and $14,000 the next, expect them to use roughly $1,000 per month ($24,000 divided by 24 months) as additional qualifying income.
Part-time work and freelance income follow the same two-year rule, though some lenders will consider a 12-month track record if the income appears stable and likely to continue. Letters from employers or clients confirming the ongoing nature of the work can help your case. The key requirement is that the income shows up on your filed tax returns. Unreported cash income, no matter how consistent, won’t count.
Rental income from investment properties you already own can also boost your numbers. Lenders typically use 75% of the gross rent (discounting for vacancies and expenses) and add it to your qualifying income. If you’re buying a multi-unit property and plan to live in one unit, the projected rent from the other units can sometimes be counted as well.
Make a Larger Down Payment
A bigger down payment doesn’t change your DTI ratio, but it affects your mortgage size in two indirect ways. First, it eliminates private mortgage insurance (PMI) if you put down 20% or more. PMI typically costs 0.5% to 1% of the loan amount per year, and that monthly premium counts toward your DTI. Removing it frees up room for a larger loan payment.
Second, a larger down payment reduces the lender’s risk, which can unlock better rates and more favorable underwriting. Some lenders will stretch DTI limits further when the loan-to-value ratio is lower, because the borrower has more skin in the game.
Improve Your Credit Score
Your credit score doesn’t directly determine how much you can borrow, but it affects the interest rate you’re offered, which in turn affects your monthly payment. A lower rate means a smaller payment for the same loan amount, so you can borrow more before hitting DTI limits.
The difference between a 680 and a 760 credit score can easily be 0.5% or more in interest rate. On a $400,000 mortgage, that’s roughly $120 per month in payment savings, translating to tens of thousands of dollars in additional borrowing capacity at the same monthly cost.
Quick wins for credit improvement include paying down credit card balances below 30% of their limits (below 10% is even better), correcting errors on your credit report, and avoiding new credit applications in the months before you apply for your mortgage. Each new inquiry and new account can temporarily lower your score.
Choose the Right Loan Program
Different loan programs have different DTI ceilings and qualification methods, so shopping the right product matters. Conventional loans through Fannie Mae’s automated system allow up to 50% DTI. FHA loans can stretch to similar levels with compensating factors. VA loans, available to eligible veterans and service members, have no official DTI cap, though most lenders impose their own limits around 41% to 50%.
If you’re self-employed or have income that’s hard to document through traditional pay stubs and W-2s, non-QM (non-qualified mortgage) loans offer alternative paths. Bank statement loans let you qualify using 12 to 24 months of bank deposits instead of tax returns, which helps if your tax deductions make your reported income look lower than your actual cash flow. Some non-QM lenders accept DTI ratios up to 60%. These loans typically carry higher interest rates than conventional mortgages, but they can unlock significantly larger loan amounts for borrowers whose tax returns understate their real earning power.
Professionals like doctors, dentists, and attorneys may qualify for physician or professional mortgage programs offered by certain banks and credit unions. These programs often allow higher DTI ratios, accept employment contracts as proof of future income, and may exclude student loan debt from the calculation entirely.
Add a Co-Borrower
Adding a spouse, partner, or family member as a co-borrower combines both incomes for qualification purposes. If you earn $80,000 and your co-borrower earns $60,000, lenders evaluate the mortgage against a combined $140,000 income. This can dramatically increase your maximum loan amount.
The trade-off is that the co-borrower’s debts also get added to the DTI calculation. If they carry significant student loans or car payments, their contribution to income might be partially offset. Run the numbers both ways before deciding. In some cases, leaving a co-borrower with heavy debt off the application actually results in a higher qualifying amount.
Lock In a Lower Interest Rate
When rates drop even slightly, your borrowing power increases. A half-point rate reduction on a 30-year mortgage lowers the monthly payment by about $30 per $100,000 borrowed. On a $500,000 loan, that’s $150 per month, which could let you qualify for an additional $25,000 to $30,000 in loan amount.
Consider buying discount points at closing if you plan to stay in the home long-term. One point costs 1% of the loan amount and typically reduces your rate by about 0.25%. Paying $4,000 upfront on a $400,000 loan to drop the rate by a quarter point saves roughly $60 per month and increases the loan size you qualify for at the same monthly budget. Choosing a longer loan term, such as a 30-year over a 15-year, also lowers the monthly payment and lets you qualify for a larger amount, though you’ll pay more interest over the life of the loan.
Get Preapproved With Multiple Lenders
Lenders interpret guidelines differently. One lender might count your bonus income while another won’t. One might use a more favorable calculation for your student loans. Getting preapproved with at least two or three lenders gives you a realistic picture of your maximum borrowing power and lets you compare who offers the most favorable terms. Multiple mortgage inquiries within a 14- to 45-day window (depending on the scoring model) count as a single inquiry on your credit report, so shopping around won’t hurt your score.