The bank says you can afford $450,000. Your real estate agent says stretch to $475,000 — “it’s only a little more per month.” Your gut says something doesn’t feel right.
Trust your gut.
Lenders will approve you for the maximum amount their guidelines allow. That’s their job — they make money on loans, not on telling you to buy less house. But the maximum you can borrow and the amount you should borrow are very different numbers. One leads to homeownership. The other leads to being house poor — technically a homeowner, practically broke.
Why the Bank’s Number Is Too High
Lenders use your debt-to-income ratio (DTI) to decide how much they’ll lend. Most will approve you up to 43-50% DTI, meaning nearly half your gross income can go toward debt payments including your mortgage.
Let’s think about that for a second. If you make $8,000/month gross, that’s maybe $6,000 after taxes. A 43% DTI means $3,440/month in debt payments. If your mortgage (including property taxes, insurance, and HOA) is $3,000 of that, you’re living on $3,000/month for literally everything else — food, utilities, gas, childcare, savings, retirement, fun. Good luck.
The bank doesn’t care about your grocery budget. They don’t factor in daycare, car maintenance, or the fact that you like to eat at restaurants occasionally. They look at income, debts, and credit score. Period.
The 28/36 Rule (and Why Even That’s Aggressive)
The traditional guideline says spend no more than 28% of gross income on housing costs and no more than 36% on total debt. That’s better than the bank’s 43-50%, but it still uses gross income — money you never actually see.
A more realistic approach: use your net (take-home) pay. Keep total housing costs — mortgage payment, property taxes, insurance, HOA, and maintenance budget — under 25-30% of what actually hits your bank account each month.
At $6,000/month take-home, that’s $1,500-$1,800 for all housing costs. Not as exciting as $3,000, but you’ll actually be able to live your life.
The Costs Everyone Forgets
When people calculate “can I afford this house,” they usually think about the mortgage payment. Maybe property taxes. But the real cost of homeownership includes a lot more:
Property taxes. These can be $200-$800+ per month depending on your area. And they go up over time. If you’re buying a new home in Florida, you’re starting without a homestead exemption cap — your tax bill could be double what the previous owner paid.
Insurance. Homeowners insurance runs $150-$400/month in many markets. Add flood insurance if you’re in a risk zone. These premiums have been rising 10-20% per year.
PMI. If you put less than 20% down, private mortgage insurance adds another $100-$300/month until you hit 20% equity.
Maintenance. The standard rule is budget 1-2% of home value per year for maintenance and repairs. On a $350,000 house, that’s $3,500-$7,000/year, or $290-$583/month. Roofs fail. ACs die. Plumbing leaks. It’s not if, it’s when.
HOA fees. If applicable, $100-$500/month that never builds equity.
Utilities. Bigger house = bigger electric, water, and gas bills. A jump from a 1,200 sf apartment to a 2,400 sf house can easily add $150-$200/month in utilities.
A Real-World Example
Let’s say you’re looking at a $350,000 house with 10% down ($35,000). Here’s what your actual monthly cost looks like at a 7% rate:
Mortgage payment (P&I): $2,095
Property taxes: $350
Homeowners insurance: $200
PMI: $165
Maintenance reserve: $290
HOA: $0
Total real cost: $3,100/month
That means you need take-home pay of at least $10,300/month (at 30%) to comfortably afford this house. That’s household income of roughly $170,000+ before taxes. If you make $120,000 combined, this house is a stretch — even though the bank would probably approve you.
The Down Payment Factor
A larger down payment reduces everything — your loan amount, your monthly payment, your total interest paid, and your PMI obligation. Putting 20% down eliminates PMI entirely, which can save $150-$300/month from day one.
But don’t drain your savings to make a bigger down payment. You need reserves — at minimum 3-6 months of expenses in cash after closing, plus money for immediate move-in costs (furniture, repairs, etc.). A 10% down payment with healthy reserves is better than 20% down and an empty savings account.
The Real Answer
Here’s the framework that works:
1. Calculate your monthly take-home pay (both earners if applicable)
2. Multiply by 0.25 to 0.30 — that’s your max housing budget
3. Subtract estimated taxes, insurance, PMI, HOA, and maintenance
4. What’s left is your available mortgage payment
5. Use a mortgage calculator to convert that payment into a purchase price at current rates
The number you get will probably be lower than what the bank approves. That’s the point. The bank’s number keeps you paying. Your number keeps you living.
Related: How Mortgage Interest Works: What You’re Actually Paying Each Month
See also: What Is Home Equity and Why It Matters More Than You Think
