Start with your monthly income, not the price tag

The amount of home you can afford depends on how much money comes in each month and how much of it you're willing to spend on housing. Most lenders will approve you for a mortgage payment between 25% and 28% of your gross monthly income — that's your income before taxes. Some lenders go as high as 43%, but that leaves less room for other bills.

To find your number, take your gross monthly income and multiply it by 0.25 or 0.28. That's your target monthly payment. If you earn $5,000 per month gross, 28% equals $1,400. That $1,400 would cover your mortgage principal, interest, property taxes, homeowners insurance, and mortgage insurance if you put down less than 20%.

This is a starting point, not a ceiling. Just because a lender will approve you for that amount doesn't mean you should borrow it. Your actual comfort zone depends on your other debts, savings, and how much risk you're willing to carry.

Key Takeaways

  • Most lenders cap your monthly housing payment at 25% to 28% of your gross monthly income, though some allow up to 43%.
  • Your monthly payment includes principal, interest, property taxes, homeowners insurance, and mortgage insurance — not just the loan itself.
  • A larger down payment (20% or more) eliminates mortgage insurance and lowers your monthly cost for the same home price.
  • Your debt-to-income ratio — all your monthly debts divided by gross income — matters as much as the housing percentage alone.
  • Lender approval and actual affordability are different things; approval is based on income, not on whether you can comfortably pay while covering other expenses.

How your down payment changes the monthly number

The size of your down payment directly affects your monthly payment. A larger down payment means you borrow less money, so your principal and interest are lower. It also eliminates private mortgage insurance (PMI), which lenders require when you put down less than 20%.

PMI typically costs 0.5% to 1.5% of your loan amount per year, divided into your monthly payment. On a $300,000 loan, that could add $125 to $375 per month. Once you reach 20% equity in the home, you can request to have PMI removed — though you have to ask; lenders don't do it automatically.

A 20% down payment also signals to lenders that you're a lower risk, which can get you a better interest rate. Even a 0.5% difference in your rate changes your monthly payment by $100 or more on a $300,000 loan.

Account for property taxes and insurance in your total

Your monthly housing payment is not just the mortgage. It includes property taxes, homeowners insurance, and possibly mortgage insurance — all bundled into one payment called PITI (Principal, Interest, Taxes, Insurance).

Property taxes vary wildly by location. Some counties charge less than 0.5% of home value per year; others charge 2% or more. A $300,000 home in a high-tax area could cost $500 per month in property taxes alone. Homeowners insurance runs $100 to $300 per month depending on the home's age, location, and coverage level. If you're putting down less than 20%, add another $100 to $400 for PMI.

When you're comparing what you can afford, research the property tax rate and typical insurance costs in the specific area you're looking at. A home that seems affordable based on the mortgage payment alone can become unaffordable once taxes and insurance are included.

Your total debt matters, not just the mortgage

Lenders look at your debt-to-income ratio (DTI), which is all your monthly debt payments divided by your gross monthly income. This includes car loans, student loans, credit cards, child support, and the new mortgage payment.

Most lenders cap your total DTI at 43%, though some go to 50% for borrowers with strong credit and savings. If you earn $5,000 per month and already pay $800 in car and student loans, you have $2,350 left for a mortgage payment (43% of $5,000 minus $800). That's $550 less than if you had no other debts.

Before you start house hunting, add up every monthly debt payment. Subtract that from 43% of your gross income. The remainder is roughly what you can afford for housing. If that number is lower than you expected, paying down other debts first will increase your buying power more than waiting for a raise.

Interest rates shift your affordability window

A 1% change in your interest rate changes your monthly payment by roughly $100 per $100,000 borrowed. At 6%, a $300,000 loan costs about $1,799 per month in principal and interest. At 7%, the same loan costs about $1,996 — nearly $200 more.

Your interest rate depends on your credit score, down payment size, loan type, and current market rates. You can't control market rates, but you can improve your credit score by paying bills on time and lowering your credit card balances before you apply for a mortgage.

If rates are high when you're ready to buy, you may afford less home than you would at lower rates. Some buyers choose to wait for rates to drop; others lock in a rate and refinance later if rates fall. Neither choice is automatic — it depends on your timeline and local market conditions.

Emergency savings and closing costs reduce what you can borrow

Lenders care about your down payment, but you also need cash for closing costs (typically 2% to 5% of the home price) and an emergency fund. If you're stretching to make a 20% down payment, you may not have money left for repairs, job loss, or medical bills.

A realistic affordability number leaves you with 3 to 6 months of expenses in savings after you close. If your total monthly expenses (housing, food, insurance, utilities, everything) are $4,000, you should have $12,000 to $24,000 in the bank after buying. That's separate from your down payment.

If reaching a 20% down payment would drain your savings completely, a 10% or 15% down payment with PMI might be smarter. You'll pay PMI for a few years, but you'll keep an emergency cushion. PMI is temporary; being house-poor is not.

Use a mortgage calculator to test different scenarios

Online mortgage calculators let you enter a home price, down payment, interest rate, and loan term to see your monthly payment. Most include property taxes and insurance estimates, though you should verify the tax rate and insurance cost for your specific area.

Run the numbers for several scenarios: different down payments, different interest rates, and different home prices. See where your comfort zone is. If a $400,000 home at 7% interest with 10% down feels too tight, try $350,000 or a larger down payment.

Remember that calculators show what lenders will approve, not what you should actually borrow. If the payment feels stressful in a spreadsheet, it will feel worse when the bill arrives every month.

Frequently Asked Questions

What if I have student loans or other debts?

Your total monthly debt payments count toward your debt-to-income ratio, which most lenders cap at 43%. If you owe $800 per month on other debts and earn $5,000 gross, you have roughly $1,350 left for a mortgage payment. Paying down other debts before buying increases your mortgage budget.

Can I afford a home if I'm self-employed?

Yes, but lenders typically average your income over two years and may require tax returns, profit-and-loss statements, and bank statements. Your income needs to show a stable or growing pattern. Some lenders are stricter with self-employed borrowers, so shop around.

Does my credit score affect how much I can afford?

Your credit score affects your interest rate, which directly changes your monthly payment. A score of 760+ typically gets the best rates; scores below 620 may not may have access to for conventional loans at all. A better score can save you $100+ per month on the same loan amount.

What happens if I can only afford 5% or 10% down?

You'll pay private mortgage insurance (PMI) until you reach 20% equity. PMI adds $100 to $400 per month depending on loan size. Once you have 20% equity through payments or home appreciation, you can request PMI removal — though you must ask your lender.

Should I buy the maximum the lender approves me for?

No. Lender approval is based on income, not on your actual comfort or life circumstances. If the maximum payment leaves you stressed or unable to cover other expenses, buy less home. Your budget should account for property taxes, insurance, maintenance, utilities, and everything else you pay for.