Home Affordability Calculator: Find Your Max Home Price

You have a solid income and some savings for a down payment, but you have no idea how much house you can actually afford without stretching yourself too thin.

Real estate agents show homes above your budget hoping you'll fall in love and "find a way." Banks approve you for more than you're comfortable borrowing. The difference between the maximum a lender will approve and the maximum you can *safely* afford is often $50,000 to $150,000. Knowing your true affordability limit protects you from buying a home that eats up your whole paycheck and leaves no room for emergencies, retirement savings, or actual living.

What This Calculator Does

This calculator determines your maximum home price based on your gross income, existing debt obligations, down payment, and current mortgage rates. It applies standard lending guidelines-the 28% front-end debt-to-income (housing costs only) and 36–43% back-end DTI (all debts including mortgage)-to show you the realistic maximum you can borrow. It works backward from your maximum affordable monthly payment to a home price, factoring in property taxes, insurance, and HOA fees for your area. You'll see both the lender's maximum approval and a more conservative estimate that leaves room for life.

How to Use This Calculator

Step 1: Enter your gross annual household income. This is income *before* taxes-include salary, bonuses, self-employment income, rental income, or other reliable sources. Don't include irregular gifts or one-time payments.

Step 2: List your monthly debt obligations. Include car loans, student loans, credit cards (minimum payments), personal loans, and alimony or child support. This is critical-high existing debt reduces how much house you can afford.

Step 3: Input your down payment amount. The more you put down, the less you need to borrow and the more affordable your home. Down payments of 20% avoid PMI; less than 20% triggers mortgage insurance that increases your monthly cost.

Step 4: Enter your expected mortgage rate. Check current rates in your area or use the average if you're not sure. Even a 0.5% difference changes affordability significantly.

Step 5: Select your state or region to account for property taxes and insurance costs, which vary widely by location.

Step 6: Hit calculate. You'll see your maximum home price, your monthly payment breakdown, your total DTI, and a detailed explanation of the lending guidelines being applied.

The Formula Behind the Math

Lenders use two debt-to-income ratios to determine how much you can borrow:

Front-End DTI (Housing Ratio): Your monthly housing payment ÷ gross monthly income ≤ 28%

Back-End DTI (Total Debt Ratio): All monthly debt payments ÷ gross monthly income ≤ 36–43%

Here's how it works. You earn $120,000 annually (gross), or $10,000 per month. Your existing debts are $800 (car loan) + $300 (student loans) + $200 (credit card) = $1,300 per month.

Front-end limit: $10,000 × 0.28 = $2,800 max housing payment

Back-end limit: ($10,000 × 0.43) − $1,300 = $3,000 max housing payment

Your lender uses the *lower* of these two: $2,800 max housing payment.

Now work backward. A $2,800 housing payment includes principal, interest, property taxes, insurance, and HOA fees. Assume property taxes and insurance total $800/month, leaving $2,000 for principal and interest. Using a mortgage calculator with a 30-year term at 7% interest, a $2,000 P&I payment supports roughly a $285,000 loan.

If you're putting down $60,000 (down payment): $285,000 + $60,000 = $345,000 maximum home price

This is your lender's maximum. Many financial advisors recommend a more conservative approach: aim for a front-end ratio of 25% instead of 28%, which gives you breathing room for emergencies and other financial goals. That would support roughly a $310,000 home in this scenario.

Our calculator does all of this backward math instantly-but now you understand exactly what limits your borrowing power.

First-Time Homebuyer with Limited Down Payment

You're earning $75,000 annually and have saved $25,000 for a down payment (roughly 8–10% on most homes in your market). Your only debt is a $350/month car loan. Your gross monthly income is $6,250. Your front-end housing limit is $6,250 × 0.28 = $1,750. Your back-end limit is ($6,250 × 0.43) − $350 = $2,335, which is higher. So your cap is $1,750 housing payment. With property taxes and insurance running $600/month in your area, you have $1,150 for principal and interest-supporting a loan of roughly $160,000. Add your $25,000 down payment, and you can afford about $185,000. That's lower than you might've hoped, but it's a realistic budget that won't overextend you. Consider improving your down payment (to reduce PMI) or increasing income before buying if you want more home.

Established Professional with Higher Income and Existing Debt

You're a dentist earning $180,000 annually ($15,000/month gross), but you're carrying $45,000 in student loans ($500/month) and a $400 car payment. Total existing debt: $900. Your front-end limit is $15,000 × 0.28 = $4,200. Your back-end limit is ($15,000 × 0.43) − $900 = $5,550. Your lender caps you at $4,200 housing payment. Property taxes, insurance, and HOA might run $1,200/month, leaving $3,000 for principal and interest. That supports a loan of roughly $425,000. With a $100,000 down payment, you can afford about $525,000. However, if you paid down your student loans to $200/month or aggressively paid off your car, your back-end DTI would improve to $6,150, potentially allowing a $5,250 housing payment and a higher home price. Paying off existing debt before buying increases your borrowing power.

Young Couple Combining Income with Student Loans

You and your partner earn $65,000 and $72,000 respectively—$137,000 combined, or $11,417 monthly. Between you, you have $600/month in student loan payments and a $300 car loan. Total debt: $900. Your front-end limit: $11,417 × 0.28 = $3,197. Your back-end limit: ($11,417 × 0.43) − $900 = $3,990. Your lender caps you at $3,197 housing. Assuming $900/month in taxes and insurance, you have $2,297 for principal and interest, supporting roughly a $330,000 loan. With a $70,000 down payment, you can afford about $400,000. This assumes both incomes are stable and documented by your lender-if one partner is self-employed, the lender may discount that income or require two years of tax returns.

High-Income Earner Considering a Luxury Home

You earn $250,000 annually ($20,833/month) with minimal debt ($200 car loan). Your front-end limit: $20,833 × 0.28 = $5,833. Your back-end limit: ($20,833 × 0.43) − $200 = $8,758. Your lender caps you at $5,833 housing. Assuming $2,000/month in property taxes and insurance on a luxury property, you have $3,833 for principal and interest, supporting about a $545,000 loan. With a $150,000 down payment, you can "afford" about $695,000. But here's the reality check: even with a high income, a $5,833 payment leaves limited funds for retirement savings, healthcare, and other life expenses. Many high-income earners find a more comfortable target is a home that uses 20–25% of gross income, not the lender's maximum 28%. That might be a $500,000 home instead of $695,000.

Tips and Things to Watch Out For

Don't confuse what a lender will approve with what you can comfortably afford. Banks are in the business of lending and will approve you near their maximum—28% front-end DTI-to maximize their loan size. But that leaves little room for emergencies, investment, or quality of life. Many financial experts recommend staying at or below 25% of gross income for housing, especially if you have other financial goals like retirement savings or building an emergency fund.

Your debt matters more than you think. High existing debt (car loans, student loans, credit cards) directly reduces your home affordability because lenders calculate your back-end DTI. Paying off or paying down consumer debt before buying can increase your home buying power by $50,000–$100,000. If you have time before buying, prioritize eliminating high-interest debt.

Property taxes and insurance vary wildly by location. A $500,000 home in a high-tax state (New Jersey, New York, Illinois) might have $800+/month in taxes and insurance alone. That same home in a low-tax state might be $400/month. When comparing homes in different areas, always run the numbers with local tax and insurance rates-they significantly affect affordability.

Increasing your down payment has two benefits. First, you borrow less, so your payment is lower. Second, if you reach 20% down, you avoid PMI, which can save $150–$300+ per month depending on the loan. Saving for a larger down payment is often smarter than buying sooner with a smaller one.

Your interest rate is locked when you lock your loan. Interest rates change daily. The rate quoted today might be different when you're ready to close. Lock your rate once you make an offer to protect against rate increases. A 1% increase in rate can reduce your home affordability by 10–15%.

Self-employed income requires extra documentation. If you're self-employed, expect your lender to average your income over two years of tax returns and possibly discount it by 25%. If you're newly self-employed or have volatile income, you may need to wait until you have a cleaner track record. W-2 income is simpler for lenders to verify.

Frequently Asked Questions

What debt counts toward my debt-to-income ratio?

Your lender counts most monthly debt payments: car loans, student loans, credit card minimums, personal loans, mortgage payments, alimony, and child support. They typically *don't* count utilities, groceries, insurance premiums, or cell phone bills. Check with your lender on borderline items, but the main rule is: if it's a fixed monthly obligation, it counts.

How does PMI affect my home affordability?

PMI (for down payments under 20%) costs $100–$300+ per month depending on your loan size and credit score. That cost comes out of your maximum housing payment, which reduces how much you can borrow. For example, if your max payment is $2,500 and PMI is $200/month, you only have $2,300 for principal, interest, taxes, and insurance. This is why a 20% down payment increases affordability-no PMI means the full amount goes to your payment.

Can I get approved for a higher amount than this calculator shows?

Possibly. This calculator uses standard lending criteria (28% front-end, 36–43% back-end DTI), but some lenders or loan programs (like portfolio lenders) have looser criteria. However, just because a lender *will* approve you for more doesn't mean you *should* borrow more. Stick to what's sustainable for your household.

What if my income is irregular or I'm self-employed?

Self-employed and irregular income require extra documentation. Lenders typically average income over two years of tax returns and may discount it by 15–25% because it's variable. New self-employed borrowers have a harder time-you may need two years of clean returns. Bonus income can count if it's documented and recurring, but only after you've received it for at least two years.

How much house can I afford with a $100,000 income?

With a $100,000 income and no other debt, your lender might approve you for a home around $350,000–$400,000 (depending on down payment, interest rate, taxes, and insurance). But the more conservative "safe" affordability is closer to $300,000–$350,000. Run your specific numbers through a calculator-location and existing debt change the answer significantly.

Is the 28% housing ratio the same everywhere?

The 28% front-end ratio is standard across most conventional lenders, but some loan programs (FHA, VA, USDA) have different guidelines. Some lenders will go up to 30% or 33% for strong borrowers. Back-end DTI ranges from 36% to 43% depending on the lender and your credit profile. Always ask your lender about their specific criteria.

Related Calculators

Use our mortgage calculator to estimate your actual monthly payment once you know your home price and down payment. Our down payment calculator shows you how much to save to hit your target down payment or reach 20% to avoid PMI. The debt-to-income calculator breaks down your DTI ratio in detail and shows how paying down debt affects your borrowing power.