How Much House Can You Actually Afford (Not Just What the Bank Approves)

Sept 12, 2026, 8 min read, Updated Sept 2026

Get pre-approved for $450,000, and the letter reads like permission — as if the bank has done the math on what you can afford and the answer is right there in writing. It hasn't. It's answered a narrower question: the largest loan it's willing to give you, based on a formula that has nothing to do with your actual budget.

The bank's number vs. a number you can live with

Lenders typically approve mortgages using debt-to-income ratios that allow housing costs up to around 28-36% of gross (pre-tax) income, sometimes higher — before taxes, before retirement contributions, before anything else you actually spend money on, which is why a lot of "approved" buyers end up house-poor immediately after closing. A more honest target: aim for total housing costs — mortgage, property taxes, insurance, and estimated maintenance — at or below 25-28% of your take-home (after-tax) pay instead. That leaves realistic room for everything else in your budget, including the parts a bank's calculation never sees.

Costs the pre-approval doesn't include

• Maintenance and repairs: Often estimated at 1-2% of the home's value per year — a $400,000 house can mean $4,000-$8,000 annually, on top of the mortgage.
• Homeowners association (HOA) fees: Common with condos and many newer developments, and easy to overlook when comparing listings.
• Higher utility costs: A bigger home than your current rental usually costs more to heat, cool, and maintain.
• Furnishing and moving costs: Rarely included in either the pre-approval or the down payment savings target.
• PMI: A down payment below 20% usually triggers private mortgage insurance, an extra monthly cost that doesn't build equity — worth factoring into the true monthly payment, not just the sticker price of the home.

A practical way to test your real number

1. Calculate your target monthly housing cost at 25-28% of take-home pay, not gross income.
2. Add estimated property tax, insurance, and 1-2% of the home value for maintenance.
3. Try living on that adjusted budget for two to three months before house-hunting, redirecting the difference into savings.
4. If that trial budget feels sustainable, you have a number you can trust — one the bank never actually calculated for you.

The pre-approval letter is useful for knowing what's possible. It was never meant to answer what's comfortable, and treating those as the same number is where a lot of home-buying regret starts.

Once you know your real number, it's also worth checking whether any first-time homebuyer programs could lower your actual down payment or closing costs — and whether renting still wins the comparison at that price point.