Mortgage lenders will often approve you for more house than you should buy. Their calculation answers 'what's the largest loan this person is unlikely to default on' — not 'what payment will this person still enjoy their life while making.' Those are very different questions, and confusing them is how people end up house-poor.
The rule lenders use, and its blind spot
Many lenders use a debt-to-income guideline — often keeping total housing costs under roughly 28% of gross income, and total debt payments under about 36–43%. Gross income is the blind spot: it's your salary before tax, before retirement contributions, before health insurance. Two people with identical gross salaries can have very different amounts left over depending on their tax bracket, benefits, and existing debt.
A more honest framework
Start from take-home pay, not gross salary — use our salary calculator to see your real monthly number after tax. Then work backward from a target: many financially comfortable homeowners keep total housing costs (mortgage, tax, insurance, HOA, maintenance) under 25% of take-home pay, leaving meaningful room for saving, debt payoff, and simply living.
Don't forget the costs the mortgage calculator doesn't show: property tax, homeowners insurance, and — if your down payment is under 20% — mortgage insurance, plus a realistic maintenance budget (a common rule of thumb is 1% of the home's value per year for upkeep).
Stress-test the number
Before committing, imagine a temporary income drop or an unplanned expense, and ask whether the payment still feels manageable. If the answer changes your confidence, the budget is too tight. Run a few scenarios through our mortgage calculator — different home prices, down payments, and terms — and compare not just the payment but how it fits against your take-home pay.