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Lenders tell you how much they will loan you. That number is not the same as how much house you should buy. Banks approve mortgages up to 43-50% debt-to-income ratio. Spending that much on housing leaves almost no margin for savings, emergencies, or life. Here is how to calculate what you can actually afford without stretching into financial fragility.
The 28/36 Rule
The most widely used affordability benchmark:
- 28% front-end ratio: Your total monthly housing costs (mortgage P&I, property taxes, homeowners insurance, HOA) should not exceed 28% of your gross monthly income.
- 36% back-end ratio: Your total monthly debt payments (housing plus car loans, student loans, credit cards, personal loans) should not exceed 36% of your gross monthly income.
At 6% mortgage rates, here is the maximum home price the 28% rule allows at different income levels:
| Gross Annual Income | Max Monthly Housing (28%) | Max Home Price (10% down, 6%, 30yr) |
|---|---|---|
| $60,000 | $1,400 | ~$210,000 |
| $80,000 | $1,867 | ~$280,000 |
| $100,000 | $2,333 | ~$350,000 |
| $130,000 | $3,033 | ~$455,000 |
| $160,000 | $3,733 | ~$560,000 |
These numbers include principal, interest, property taxes at 1.2%, and homeowners insurance. If your target area has higher property taxes or you need PMI, reduce these estimates accordingly.
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Why the Bank’s Number Is Higher Than Yours Should Be
Banks approve you based on your ability to make the payment, not your ability to save, invest, handle emergencies, or enjoy your life. A lender approving a 45% DTI ratio means 45% of your gross income goes to debt. After taxes, you might be left with 30-35% of your gross for everything else: food, transportation, utilities, clothing, entertainment, savings, retirement, emergencies.
The 28/36 rule is more conservative and that is intentional. Housing costs are fixed and recurring. If you stretch to 40% DTI for your dream home, one job loss, medical bill, or major repair can cascade into missed payments, credit damage, and financial stress that affects every part of your life.
Hidden Costs That Inflate the True Price
The mortgage payment is not the total cost of homeownership. When calculating what you can afford, include:
- Property taxes: Varies widely by state and county. Texas averages 1.8%, New Jersey 2.2%, Hawaii 0.3%. On a $350,000 home in Texas, property taxes alone are $6,300/year ($525/month).
- Homeowners insurance: $150-$300/month depending on location and coverage.
- HOA fees: $200-$800/month in communities with associations. Must be included in your front-end DTI calculation.
- Maintenance and repairs: Budget 1-2% of home value annually. A $350,000 home needs $3,500-$7,000/year for ongoing maintenance. This is not optional. Deferred maintenance becomes expensive repairs.
- PMI: If your down payment is under 20%, PMI adds 0.5-1.5% of the loan amount annually until you reach 20% equity.
How Much to Save for a Down Payment
Three common down payment strategies in 2026:
3-3.5% (FHA or conventional low-down programs): Lowest barrier to entry. Requires mortgage insurance. Good for buyers who want to purchase sooner and have stable income but limited savings. The cost of PMI ($100-$200/month) is the price of buying earlier.
10%: Reduces the loan amount meaningfully, reduces PMI compared to 3-5%, and is achievable for most buyers with 2-3 years of focused saving. Best balance between accessibility and cost reduction.
20%: Eliminates PMI entirely. Requires the most saving time but results in the lowest monthly payment and total cost. Best for buyers who are patient and have not yet found their long-term home.
The Emergency Fund Rule for Homebuyers
Do not drain your emergency fund for the down payment. After closing, you need liquid savings to handle the inevitable early expenses: the appliance that breaks in month two, the roof that needs a repair, the HVAC that fails in summer. Most financial advisors recommend keeping 3-6 months of expenses in savings after closing, separate from the down payment.
This means your savings goal is: down payment + closing costs (2-5% of purchase price) + 3-6 months emergency fund. For a $350,000 home with 10% down, that is $35,000 down + $10,500 closing costs + $15,000-$25,000 emergency fund = $60,500-$70,500 total savings needed before buying.
Sources: Consumer Financial Protection Bureau mortgage affordability guidance; Freddie Mac mortgage data 2026; National Association of Realtors affordability index. This article is for informational purposes only and does not constitute financial advice.
