How Much House Can You Actually Afford? (Most People Get This Wrong)

Banks will approve you for more than you can comfortably afford. Here's the real number — and how to calculate it before you fall in love with the wrong house.

Sarah Mitchell

Personal Finance Writer

The bank pre-approved you for $550,000. Your real estate agent is excited. Your family is proud. There's just one problem: the bank doesn't care if you're miserable for the next 30 years.

Lenders calculate how much they'll loan you based on whether you'll pay them back — not whether you'll be able to save for retirement, take a vacation, or handle an unexpected furnace replacement.

💡 The rule most financial advisors actually use: Your monthly mortgage payment should be no more than 25–28% of your gross monthly income — not the 43% debt-to-income ratio banks often approve.

The gap between those two numbers can be $150,000 or more in home value. That's the difference between a house that builds wealth and one that quietly breaks you.

Why Bank Pre-Approvals Are Misleading

Banks use what's called the back-end debt-to-income ratio — typically allowing up to 43% of your gross income to go toward all debt payments combined (mortgage, car, student loans, credit cards).

On paper, someone earning $7,000/month gross could be approved for a mortgage payment of up to $2,000/month after other debts. That sounds fine until you realize:

That's before taxes, which might take 22–24% of your income
It doesn't account for HOA fees, maintenance, or property taxes beyond the estimate
There's zero room for retirement contributions, college savings, or emergencies

43%

Maximum debt-to-income ratio banks allow — vs. the 25–28% most financial planners recommend

The result? Millions of Americans are technically "approved" for a lifestyle they can't actually sustain.

The 28/36 Rule — The Real Affordability Standard

Financial planners have long used the 28/36 rule as a smarter benchmark:

28% — Your total housing costs (mortgage + taxes + insurance) should not exceed 28% of gross monthly income
36% — All debt payments combined should not exceed 36% of gross monthly income

On a $7,000/month gross income, that means a maximum housing payment of $1,960/month — and if you have a $400/month car payment, your housing budget drops to $1,120/month to stay under 36% total.

"The best house is the one you can afford to keep." — Every financial advisor who has watched clients sell their dream home in a panic.

Run your actual numbers below using our free mortgage calculator — enter what you're considering, then check if it passes the 28% test.

🛠 Free Tool

Mortgage Calculator

Enter the home price, your down payment, interest rate, and loan term to see your real monthly payment — then check it against 28% of your income.

Open Full Tool →

💡 Use the tool above, then scroll down to understand your results.

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Understanding Your Results

What the numbers actually mean for you

What to Do With Your Results

Once you have your monthly payment, divide it by your gross monthly income. If the number is above 0.28 (28%), the house is likely stretching you too thin — regardless of what the bank says.

If your payment is 25% or below:

You're in great shape. You have buffer for property tax increases, maintenance costs (budget 1–2% of home value annually), and unexpected expenses.

If your payment is 28–35%:

Proceed carefully. You'll need to be disciplined about other spending, and you have limited room for financial surprises. Consider a larger down payment to bring the payment down.

If your payment is above 35%:

This is the bank's number, not yours. You're likely looking at a house that's too expensive for your current income. Either wait, save more, or look in a lower price range. The stress of an unaffordable mortgage affects relationships, health, and career performance — it's not worth it.

💡 Pro tip: Every $10,000 more in home price adds roughly $50–60/month to your payment at today's rates. A $30,000 price difference is only $150–180/month — often less than people expect. But over 30 years, that's $54,000 more in payments.

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Finance