The price you can afford depends on your down payment, income, and debt — not on what a lender will let you borrow

A lender will often approve you for more than you should spend. Banks use a formula: they typically allow your total monthly debt payments (including the new mortgage) to reach 43% of your gross monthly income. That is their risk tolerance, not your financial safety. Your actual affordability is lower, because that formula does not account for property taxes, insurance, maintenance, or the fact that your income might drop.

Start with what you can put down. If you have $50,000 saved and need a 20% down payment, you can afford a $250,000 home. If you can only put down 5%, that same $50,000 buys a $1,000,000 home — but you will pay mortgage insurance, which adds hundreds to your monthly payment. The down payment is the first real constraint, not the lender's approval letter.

Next, look at your monthly budget. A safe rule is that your mortgage payment (including property tax, insurance, and mortgage insurance if you have it) should not exceed 28% of your gross monthly income. If you earn $5,000 a month gross, your housing payment should stay under $1,400. That is tighter than what lenders allow, but it leaves room for the rest of your life.

Key Takeaways

  • Your down payment size directly limits the price range you can consider — a larger down payment lets you buy more house for the same amount saved.
  • Lenders will approve you for more than is safe; a 43% debt-to-income ratio leaves little cushion for emergencies or income loss.
  • A mortgage payment should not exceed 28% of your gross monthly income if you want to avoid financial strain.
  • Property taxes, insurance, and maintenance costs vary by location and add significantly to your true monthly housing expense.
  • Existing debt (car loans, student loans, credit cards) reduces the mortgage amount lenders will approve, sometimes by thousands of dollars per month.

How your down payment size changes what you can afford

The down payment is the money you bring to closing. The rest comes from the mortgage. If you have $80,000 saved and put down 20%, you can buy a $400,000 home and borrow $320,000. If you put down only 10%, that same $80,000 buys a $800,000 home and you borrow $720,000.

Putting down less than 20% triggers private mortgage insurance (PMI), which protects the lender if you stop paying. PMI typically costs 0.5% to 1.5% of the loan amount per year, divided into your monthly payment. On a $720,000 loan, that is $300 to $900 per month extra. You can remove PMI once you reach 20% equity, but that takes years of payments.

The math is simple: more down payment means a lower loan amount, a lower monthly payment, and no PMI. If you have saved $50,000, you have a choice between buying a $250,000 home with 20% down and no PMI, or a $333,000 home with 15% down and PMI. The second option costs more per month and locks you into that extra cost for years.

What your income and existing debt actually allow

Lenders use your debt-to-income ratio (DTI) to decide how much to lend. They add up all your monthly debt payments — car loans, student loans, credit cards, the new mortgage — and divide by your gross monthly income. Most lenders allow this to reach 43%. Some allow 50% if you have excellent credit and savings.

That is the ceiling, not the target. If you earn $6,000 a month gross and have a $400 car payment and $200 in student loans, you have $600 in existing debt. At a 43% DTI, your total debt can be $2,580 per month. That leaves $1,980 for a mortgage payment. But $1,980 is not safe if your car breaks down, your hours get cut, or you face a medical bill.

A safer approach: keep your housing payment to 28% of gross income and your total debt to 36%. On $6,000 gross, that means a $1,680 mortgage payment and $2,160 total debt. With $600 in existing debt, you have $1,560 left for housing. That is $420 less than the lender would allow, but it is the difference between comfort and stress.

How property taxes and insurance change the real cost

Your mortgage payment is not just principal and interest. It includes property tax, homeowners insurance, and possibly PMI. These vary wildly by location. In some counties, property tax is 0.3% of home value per year. In others, it is 2%. Insurance ranges from $800 to $2,000 per year depending on the home and location.

A $400,000 home in a low-tax area might have a $2,200 mortgage payment (principal and interest), $300 in property tax, and $100 in insurance — $2,600 total. The same home in a high-tax area could be $2,200 plus $700 in tax plus $150 in insurance — $3,050 total. That $450 difference is $5,400 per year, which changes what you can afford.

Before you settle on a price, look up the property tax rate in the county where you are buying. Search "[county name] property tax rate" and multiply the home price by that percentage, then divide by 12 to get the monthly cost. Add an estimate for insurance — your lender or a local agent can give you a range. That is your true monthly housing cost, not just the mortgage payment.

Maintenance and repairs add to your real monthly expense

Lenders do not factor maintenance into affordability. But a home costs money to keep standing. The general rule is to budget 1% of the home's value per year for maintenance and repairs. A $400,000 home costs roughly $4,000 per year, or $333 per month, in upkeep.

That covers routine things: HVAC service, roof repairs, plumbing fixes, painting, appliance replacement. It does not cover a new roof ($15,000), foundation work ($20,000), or a failed septic system ($10,000). If you have no emergency fund, a major repair forces you to borrow or miss a mortgage payment.

Add the maintenance budget to your housing cost when you decide what you can afford. If your mortgage, tax, and insurance total $2,600, and maintenance is $333, your real housing cost is $2,933. That changes whether you fit comfortably in your budget.

How to calculate your actual affordability number

Start with your gross monthly income — the number before taxes. Multiply by 0.28 to find the maximum you should spend on housing. That is your target mortgage payment, including tax, insurance, and PMI.

Next, subtract your existing monthly debt payments from your gross income. Multiply the remainder by 0.36 to find your total debt ceiling. Subtract your existing debt from that number. The result is the maximum you should add in housing debt.

Use an online mortgage calculator to work backward: enter the payment you can afford, and it will show you the loan amount. Add your down payment to that loan amount. That is the home price you can afford.

Example: You earn $7,000 gross per month. 28% is $1,960 — your housing payment target. You have a $300 car payment and $150 in student loans. Your total debt is $450. Your income minus that is $6,550. 36% of $6,550 is $2,358. You can afford $2,358 in total debt, so housing can be $2,358 minus $450 = $1,908 per month. A mortgage calculator shows that $1,908 per month (at current rates) buys roughly a $380,000 loan. If you have $80,000 saved for a down payment, you can afford a $460,000 home.

What happens if you buy more than you can afford

Buying above your means creates a cascade of problems. Your mortgage payment leaves little for food, car maintenance, medical bills, or emergencies. One job loss or medical event forces you to choose between paying the mortgage and paying other bills. You cannot save for retirement or your children's education. You are one emergency away from missing a payment.

Missed payments damage your credit score, which affects your ability to borrow for anything else. After 90 days of missed payments, your lender can begin foreclosure. You lose the home and the down payment you put in. The foreclosure stays on your credit report for seven years.

The lender's approval letter is not permission to spend that much. It is a statement of their risk tolerance. Your risk tolerance should be lower.

Frequently Asked Questions

Can I afford a home if I have student loan debt?

Yes, but it reduces the mortgage amount lenders will approve. Your student loan payment counts toward your debt-to-income ratio. If you owe $300 per month in student loans, that $300 comes out of the debt budget before your mortgage. Paying down student loans before buying increases the mortgage you can afford.

What if I put down less than 20%?

You will pay mortgage insurance (PMI), which adds $200 to $900 per month depending on the loan size and your credit score. This increases your true monthly cost. You can remove PMI once you reach 20% equity, which takes years. Factor the PMI cost into your affordability calculation.

Should I use the lender's approval amount as my budget?

No. Lenders approve based on a 43% debt-to-income ratio, which is their maximum risk, not your safe limit. Use 28% for housing and 36% for total debt. This leaves room for emergencies, income loss, and the rest of your life.

How do I know what property taxes will be in a new area?

Search "[county name] property tax rate" or "[city name] property tax rate." Multiply the home price by that rate and divide by 12 to get the monthly cost. Tax rates vary by county, so check the specific location where you are buying, not just the state average.

What if my income is irregular or seasonal?

Lenders typically average your income over two years if you are self-employed or work seasonal jobs. Use your lowest recent year as your affordability number, not your best year. This protects you if income drops in the future.