The Real Math Behind What You Can Afford in Real Estate

How Much House Can You Actually Afford? (Spoiler: It’s Not 3x Your Salary)

You’ve probably heard the old rule: spend no more than three times your annual income on a home. But if you’ve tried house-hunting lately, you already know that advice doesn’t hold up in today’s market. The real answer isn’t a catchy formula — it’s math you need to run *yourself*, and it starts with your actual budget, not a rule of thumb.

The Real Math Behind What You Can Afford

Lenders will tell you how much they’re willing to loan — often based on your debt-to-income ratio (DTI) and credit score. But just because a bank says “yes” doesn’t mean that number fits your life. The true cost of homeownership goes far beyond your mortgage payment.

Start with your gross monthly income. Then subtract all your fixed debts — car payments, student loans, credit cards — to get your DTI. Lenders like to see this below 36%, with no more than 28% going toward housing. But don’t treat those as finish lines. They’re guardrails, not goals.

Next, add in the hidden costs most buyers forget:

- **Property taxes** (they vary wildly by ZIP code)

- **Homeowners insurance**

- **HOA fees**, if applicable

- **Maintenance** (plan for 1–2% of the home’s value per year)

- **Utilities**, especially if moving from an apartment

For example, a $300,000 home might come with a $1,400 monthly mortgage (at today’s rates), but add $300 in taxes, $100 in insurance, $150 in maintenance, and $200 in utilities — and suddenly you’re looking at $2,150/month, not $1,400.

Also consider your down payment. A bigger down payment lowers your monthly bill *and* keeps you from paying private mortgage insurance (PMI). Aim for 20% if you can, but know that FHA loans allow as little as 3.5% — just be aware of the long-term cost.

And don’t forget your emergency fund. If buying a home drains your savings, one leaky roof could land you in financial stress. Protect your liquidity.

3 Actionable Takeaways

1. **Use the 28% rule as a ceiling, not a target.** If housing eats more than a quarter of your take-home pay, it may strain your other goals.

2. **Run the full monthly cost, not just the mortgage.** Use online calculators that include taxes, insurance, and estimates for maintenance.

3. **Get pre-approved, not just pre-qualified.** A real pre-approval includes a credit check and verified income — and gives you stronger negotiating power.

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Photo by Kindel Media • Published May 24, 2026