Why "How Much the Bank Approves" Isn't the Right Question
Mortgage pre-approval is based on debt-to-income ratios that leave little room for savings, unexpected expenses, or lifestyle beyond housing. Lenders are assessing their risk of you defaulting — not whether the payment leaves you a comfortable financial life. Those are two different questions.
The 28/36 Rule
A widely used affordability guideline:
- 28% rule: Your total housing payment (principal, interest, taxes, insurance — "PITI") shouldn't exceed 28% of gross monthly income.
- 36% rule: Your total debt payments (housing plus car loans, student loans, credit cards) shouldn't exceed 36% of gross monthly income.
Many lenders will approve well beyond these ratios (sometimes up to 43-50% for total debt), which is exactly why "approved amount" and "comfortable amount" diverge.
The True Cost of Homeownership Beyond the Mortgage
A mortgage payment is only part of the picture. Budget for:
- Property taxes — varies enormously by location, often 0.5%-2%+ of home value annually
- Homeowners insurance — required by lenders, cost depends on location and coverage
- PMI (Private Mortgage Insurance) — required with less than 20% down, adds a real monthly cost until you reach 20% equity
- Maintenance and repairs — a commonly cited rule of thumb is 1-2% of home value per year
- HOA fees — if applicable, can range from minimal to several hundred dollars monthly
- Utilities — often higher than renting, especially for larger homes
A Practical Framework
- Calculate your gross monthly income and apply the 28% rule to find a starting PITI ceiling.
- Estimate taxes and insurance for your target area (a local real estate agent or online estimator can help) and back into a principal-and-interest budget.
- Use a Mortgage Calculator to translate that payment into a loan amount at current rates.
- Add your down payment to get a target home price — check with a Down Payment Calculator.
- Stress-test the number. Could you still make this payment if one income temporarily disappeared? If not, consider a lower target.
Why Your Down Payment Percentage Matters Beyond the Loan Size
Putting down less than 20% doesn't just mean a bigger loan — it triggers PMI, typically 0.5%-1.5% of the loan amount annually until you reach 20% equity. On a $350,000 loan, that can mean an extra $150-400+ per month that provides zero equity benefit to you, purely insuring the lender.
Don't Forget Closing Costs
Beyond the down payment, budget 2-5% of the purchase price for closing costs — appraisal, inspection, title insurance, and lender fees. See a Closing Cost Calculator for an estimate specific to your target price.