How much house can you afford? The 28/36 rule vs. reality

Ask a lender how much house you can afford and you'll get a number based on what they're willing to lend you. Those are not the same thing. Lenders are answering 'how big a loan can this person plausibly repay?' You need to answer 'how big a payment can I carry while still living the rest of my life?' The gap between those two numbers is where house-poor households are made.

The 28/36 rule

The classic guideline: spend no more than 28% of your gross monthly income on housing (mortgage principal and interest, property taxes, insurance, and HOA dues), and no more than 36% on all debt combined (housing plus car loans, student loans, credit card minimums). It's a decent first-pass filter because it forces you to count taxes and insurance, which listing-site calculators love to lowball.

What the rule misses

• It's based on gross income, but you live on net income. After taxes, retirement contributions, and health insurance, 28% of gross can easily be 40% of take-home pay.
• It ignores childcare, which in many cities costs as much as a mortgage payment.
• It ignores retirement savings. A budget that 'works' only because you stopped contributing to your 401(k) doesn't work.
• It treats property taxes as an afterthought, but they range from under 0.5% to over 2% of home value per year depending on the state — a $500+/month swing on the same house.
• It says nothing about maintenance, which runs roughly 1% of home value per year long-term.

Lender approval is not a recommendation

Lenders will routinely approve conventional loans at debt-to-income ratios of 43–50%. That's not because they think it's a good idea for you — it's because the loan still statistically performs at that level. A pre-approval letter is a ceiling, not a target. Buying at the top of your approval means one job loss, one baby, or one roof away from real trouble.

A better method: budget backwards

1. Start from your actual take-home pay, not gross income.
2. Subtract retirement savings (aim for 10–15% of gross), an emergency fund contribution, and all non-housing essentials — food, transport, childcare, insurance, debt payments.
3. Subtract what you actually spend on living: travel, hobbies, gifts. Be honest, not aspirational.
4. What's left is your true housing ceiling. Then subtract 1% of the target home's value per year (divided by 12) for maintenance to get your maximum mortgage + taxes + insurance payment.
5. Convert that payment to a price using current rates and your local property tax rate — not a national average.

What the ceiling looks like at 2026 rates

To translate the method into numbers, here's what a conservative all-in housing budget looks like at several incomes, assuming an estimated 6.6% thirty-year rate, 1.1% property taxes, typical insurance, and the 28% gross-income cap. The comfortable-price column also assumes ten percent down and no other debt — subtract aggressively if you carry car or student loans, since the 36% total-debt cap binds first for most households.

Those prices land far below what pre-approval letters typically say, and the gap is the entire point. A lender approving 45% of gross income is describing the outer edge of statistical repayment, not a life with vacations, retirement contributions, and a maintenance fund. Treat the table as a starting grid, then adjust for your actual tax rate and insurance market — a Texas property tax bill or a Florida insurance premium can move these numbers by tens of thousands of dollars in either direction.

Signs you're stretching too far, whatever the formula says

• You'd have to pause retirement contributions to make the payment work.
• The plan depends on a raise, a bonus, or a partner's future job materializing on schedule.
• You couldn't absorb a $5,000 repair in year one without reaching for a credit card.
• The payment only works with the longest loan term and the thinnest insurance policy quoted.
• You feel relief, not excitement, when an offer falls through.

Finally, remember that the affordability question repeats after you buy. Property taxes get reassessed, insurance premiums reprice every year, and HOA dues drift upward — the payment you qualify for today is the cheapest this house will ever be. Leaving a cushion between your maximum and your actual choice isn't leaving house on the table; it's pre-paying for the years when the fixed payment stops being the whole story. Buyers who purchase one notch below their ceiling report the same satisfaction with the house and none of the three-in-the-morning arithmetic.

The bottom line

Use 28/36 as a quick sanity check, not a verdict. The real answer comes from your take-home budget with retirement savings, maintenance, and your actual life already funded. And remember that the most expensive house you're approved for and the right house for your finances are usually tens of thousands of dollars apart.