How Much Mortgage Can I Qualify For?

Before you start browsing Zillow or attending open houses, you need to answer the most important question in home buying: how much mortgage will a lender actually approve you for? The answer depends on a specific set of financial factors that lenders evaluate during pre-approval. Understanding these rules lets you set realistic expectations and avoid the heartbreak of falling in love with a house you cannot afford.

Here is exactly how lenders determine your maximum mortgage amount, and how you can use those same calculations yourself.

What Is the DTI Rule for Mortgage Qualification?

Debt-to-income ratio (DTI) is the single biggest factor in mortgage qualification. DTI measures what percentage of your gross monthly income goes toward debt payments. Lenders use two types:

• Front-end DTI: Your proposed housing payment (mortgage principal, interest, taxes, insurance, and HOA) divided by gross monthly income. Most lenders want this at or below 28%.
• Back-end DTI: All monthly debt payments (housing plus car loans, student loans, credit card minimums, personal loans) divided by gross monthly income. The maximum is typically 43% for conventional loans, though some lenders allow up to 50% with strong compensating factors.

For example, if you earn $8,000/month gross and have $500/month in existing debt payments, a lender at the 43% back-end limit would allow total debt payments of $3,440/month. Subtract your existing $500, and that leaves $2,940/month for your housing payment. At a 7% interest rate on a 30-year loan, that supports roughly a $440,000 mortgage.

Run your own numbers with our mortgage calculator to see exactly what monthly payment different loan amounts produce.

How Income Affects Qualification

Lenders use your gross income (before taxes) from all stable, documentable sources. This includes:

• W-2 salary: Your base pay, bonuses (if consistent for 2+ years), and overtime
• Self-employment income: Two-year average from tax returns. Lenders use the lower of the two years if income is declining.
• Rental income: Typically 75% of rental revenue (lenders discount for vacancies and expenses)
• Investment income: Dividends and interest if consistent
• Alimony/child support: Only if you choose to disclose it and can document at least 3 years of remaining payments

The key word is "documentable." If you earn cash tips or side income that does not appear on your tax returns, lenders will not count it. This is one reason to report all income on your taxes, especially if you plan to buy a home within the next two years.

Use our paycheck calculator to understand the difference between your gross and net income, so you can budget accurately for a mortgage payment that fits your actual take-home pay.

How Does Your Credit Score Affect Mortgage Qualification?

Your credit score does not determine how much you can borrow — DTI does that. But your score determines the interest rate you receive, which indirectly affects how much house the same monthly payment buys.

• 760+: Best available rates. You will qualify for the lowest advertised rates.
• 740-759: Slightly higher rates, typically 0.125% above the best tier.
• 700-739: Rates roughly 0.25-0.5% above the best tier. Still solid.
• 660-699: Rates 0.5-1% higher. You will pay noticeably more over the life of the loan.
• 620-659: Minimum for most conventional loans. Rates can be 1-1.5% higher, and you may face additional requirements.
• Below 620: FHA loans require a minimum of 580 with 3.5% down, or 500-579 with 10% down. Conventional loans are generally not available.

The practical impact is significant. On a $400,000 mortgage, the difference between a 6.5% and 7.5% rate is $267/month, or $96,000 over 30 years. If your score is borderline, spending 3-6 months improving it before applying can save tens of thousands of dollars.

Down Payment: How Much You Really Need

The 20% down payment is a guideline, not a requirement. Here are the actual minimums:

• Conventional loans: 3% down for first-time buyers (5% otherwise). You will pay private mortgage insurance (PMI) until you reach 20% equity.
• FHA loans: 3.5% down with a 580+ credit score. Mortgage insurance premium (MIP) is required for the life of the loan.
• VA loans: 0% down for eligible veterans and active-duty service members. No mortgage insurance required.
• USDA loans: 0% down for eligible rural properties. Income limits apply.

A larger down payment does not change your DTI-based qualification amount, but it does change two things: the loan amount (and therefore the monthly payment), and whether you pay mortgage insurance. PMI typically costs 0.5-1% of the loan amount annually, adding $167-$333/month on a $400,000 loan.

Check your full home buying budget with our home affordability calculator, which accounts for down payment, taxes, insurance, and PMI to show you what you can truly afford.

Other Factors Lenders Evaluate

Beyond the big four (DTI, income, credit score, and down payment), lenders also consider:

• Employment history: Two years of stable employment in the same field is preferred. Job-hopping or recent career changes can raise flags.
• Cash reserves: Lenders want to see 2-6 months of mortgage payments in liquid savings after your down payment and closing costs.
• Loan type and property type: Investment properties require higher down payments (15-25%) and have stricter DTI limits. Condos may have additional requirements.
• Existing assets: Large retirement accounts or investment portfolios can serve as compensating factors if your DTI is borderline.

How to Maximize Your Qualification Amount

If you want to qualify for the highest possible mortgage, focus on these actions in the 6-12 months before applying:

• Pay down revolving debt: Eliminating a $300/month credit card payment increases your qualification amount by roughly $50,000-$60,000.
• Avoid new debt: Do not buy a car, open new credit cards, or take on personal loans before or during the mortgage process.
• Increase documentable income: If you have side income, start reporting it on your taxes now. You need two years of documentation.
• Improve your credit score: Pay all bills on time, reduce credit utilization below 30% (ideally below 10%), and do not close old accounts.
• Save aggressively: A larger down payment reduces the loan amount needed, making it easier to qualify under DTI limits.

Qualification vs. Affordability

Here is the uncomfortable truth: the amount a lender will approve you for is almost always more than you should actually spend. A 43% DTI mortgage leaves very little room for savings, retirement contributions, emergencies, or lifestyle spending. Most financial advisors recommend keeping your total housing cost at or below 28% of gross income.

Qualifying for a $500,000 mortgage does not mean you should take one. Run the full picture — including property taxes, insurance, maintenance, and your other financial goals — before committing to a number. Our mortgage calculator shows the true monthly cost, and the home affordability tool helps you find the sweet spot between what a lender will approve and what actually fits your financial life.