Home Affordability Calculator: How Much House You Can Actually Afford (It's Less Than the Bank Says)
Home Affordability Calculator: How Much House You Can Actually Afford (It's Less Than the Bank Says)
The bank says you can afford $450,000. Your real estate agent is already sending you listings at $475,000. Your friends just bought for $500,000 and they make about what you make. Everybody around you is telling you to stretch. And that is exactly how people end up house-poor — owning a beautiful home they cannot afford to furnish, maintain, or enjoy because the mortgage payment eats half their take-home pay.
Lenders use the 28/36 rule: your housing costs should not exceed 28% of your gross monthly income, and your total debt should stay under 36%. But gross income is not what hits your bank account. After taxes, health insurance, and retirement contributions, that $85,000 salary becomes roughly $4,800 per month. Twenty-eight percent of your gross is $1,983. Twenty-eight percent of your net is closer to $1,344. That is a huge gap, and the bank is using the bigger number.
The lender's job is to approve loans without losing money. Your job is to live a comfortable life. Those are not the same goal. The bank's standards are the ceiling, not the target. You should set your target far below that ceiling.
The 25% Rule Is a Lot More Realistic
A better benchmark than the 28/36 rule is keeping your total housing payment — PITI (principal, interest, taxes, insurance) — under 25% of your take-home pay. That gives you room to save for retirement, build an emergency fund, and actually enjoy your life. People who stretch to 40-50% of net income are one job loss or medical emergency away from foreclosure.
Let's run some real numbers. If you earn $85,000 with $500 in monthly debt payments and $30,000 down, at 6.5% interest, the 28/36 rule says you can afford about $320,000. Your monthly payment would be roughly $2,100 including taxes and insurance. That sounds manageable until you realize that $2,100 is 44% of your $4,800 monthly take-home. After your $500 in other debt payments, you have $2,200 left for everything else — food, utilities, transportation, savings, entertainment. In 2024 dollars, that is tight.
The 25% of net income target drops the affordable price to about $250,000. That might mean buying a smaller house, a fixer-upper, or a condo instead of a single-family home. It might mean waiting another year to save a bigger down payment. Both are better than being house-poor.
Use our Home Affordability Calculator below to find your real number.
🔗 Bookmark the tool: Use our free Home Affordability Calculator to find your real budget before you start house hunting.
What the Calculator Does Not Tell You
This calculator is mathematically solid. It uses the same 28/36 ratios lenders use and backs out a maximum home price from your income, debts, and down payment. But there are five things it cannot account for that you absolutely must consider:
First, property taxes vary wildly by location. New Jersey averages over 2% of home value annually. Hawaii averages under 0.3%. The default 1.15% is a national average that might be way off for your area. Second, PMI (private mortgage insurance) kicks in if you put down less than 20%. It costs roughly 0.5-1% of the loan amount annually and adds hundreds to your monthly payment. Third, utilities in a larger home cost more. That 3,000-square-foot house costs more to heat, cool, and light than your 1,200-square-foot apartment. Fourth, HOA fees can run $200-$500 per month in planned communities and condos. Fifth, moving costs money — typically thousands for even a modest move.
The calculator gives you the baseline. You need to layer these real-world costs on top to get your true picture.
FAQ: Home Affordability
Should I use gross or net income for affordability calculations?
Lenders use gross income. Smart buyers use net income. Your net income is what actually pays bills. The calculator uses gross (following lender standards), but mentally apply the 25% rule to your take-home pay for a more conservative budget.
Can I afford a house if I have student loans?
Yes, but they reduce your buying power. The calculator factors in your monthly debt payments against the 36% back-end ratio. The more you owe each month, the less house you can afford. Paying down high-interest debt before buying almost always makes sense.
What interest rate should I use?
Use today's average rate for your credit profile. As of early 2025, 30-year fixed rates are around 6.5-7% for good credit. Check current rates before running the numbers. A 1% rate difference can change your affordable price by $30,000-$50,000.
The Bottom Line
The bank will approve you for more than you should spend. That is not malicious — it is just how the math works on their side. Your side of the math should be more conservative. Buy less house than the maximum. Build a buffer. Leave room in your budget for life — travel, hobbies, emergencies, retirement. A house is not an investment portfolio. It is a place to live. Do not let the size of your mortgage determine the quality of your life.
Disclaimer: This article is for educational purposes only and does not constitute financial or mortgage advice. Loan approval amounts, interest rates, and terms vary based on individual circumstances, credit history, and lender policies. Consider consulting a qualified mortgage professional for personalized guidance.