The question “how much house can I afford?” has two answers: what a lender will approve you for and what you can actually afford without financial stress. These numbers are not always the same. This guide explains both and gives you the tools to calculate your own comfortable ceiling.
Get pre-approved to know your actual buying power: Compare pre-approval offers on LendingTree — takes minutes and shows you real numbers based on your credit profile.
The Lender’s Calculation: What You Can Borrow
Lenders primarily use two ratios to determine how much they will lend you:
Front-End Ratio (Housing Expense Ratio)
Total monthly housing costs divided by gross monthly income. Most conventional lenders prefer this ratio at or below 28%. FHA loans allow up to 31%.
Monthly housing costs include: principal, interest, property taxes, homeowner’s insurance, and PMI/MIP if applicable. HOA fees are sometimes included.
Back-End Ratio (Debt-to-Income Ratio)
Total monthly debt payments (including the proposed mortgage) divided by gross monthly income. Most conventional lenders allow up to 43–45% DTI. FHA loans allow up to 57% with strong compensating factors.
Total debt payments include: proposed mortgage (PITI), car loans, student loans, credit card minimum payments, and any other installment or revolving debt.
Affordability Calculation by Income
| Annual Income | Monthly Gross | Max Monthly Housing (28%) | Approx. Max Loan (7% rate, 30yr) |
|---|---|---|---|
| $50,000 | $4,167 | $1,167 | ~$175,000 |
| $75,000 | $6,250 | $1,750 | ~$262,000 |
| $100,000 | $8,333 | $2,333 | ~$350,000 |
| $125,000 | $10,417 | $2,917 | ~$438,000 |
| $150,000 | $12,500 | $3,500 | ~$525,000 |
Note: These are estimates at 7% interest rate. Lower rates increase purchasing power; higher rates reduce it. Taxes, insurance, and PMI reduce the loan amount you can support at the same income because they consume part of the front-end ratio limit.
The 28/36 Rule vs. the Lender Maximum
The traditional personal finance guideline — the 28/36 rule — says to spend no more than 28% of gross income on housing and no more than 36% on all debt combined. This is more conservative than what most lenders will approve.
Being approved for a loan does not mean you should take the full amount. Lenders approve based on income and debt ratios; they do not account for your retirement savings goals, children’s education plans, or how much you spend on food and transportation.
True Monthly Cost of Ownership
Most affordability calculators show only principal and interest. The true monthly cost of homeownership is higher. On a $350,000 home with 5% down ($17,500):
| Cost Component | Monthly Estimate |
|---|---|
| Principal & interest (7%, 30yr, $332,500 loan) | $2,213 |
| Property taxes (1.1% annually) | $321 |
| Homeowner’s insurance | $150 |
| PMI (0.7% annually) | $194 |
| Maintenance reserve (1% annually) | $292 |
| Total true monthly cost | ~$3,170 |
The “maintenance reserve” is not a monthly bill, but it represents the average annual spending on repairs, HVAC servicing, appliance replacement, and routine upkeep that homeowners experience.
Down Payment Size and Its Effect on Monthly Costs
A larger down payment reduces your loan balance, eliminating PMI if you reach 20%, and lowers your monthly payment:
| Down Payment | Loan Amount | Monthly P&I (7%) | PMI? |
|---|---|---|---|
| 3% ($10,500) | $339,500 | $2,260 | Yes (~$198/mo) |
| 5% ($17,500) | $332,500 | $2,213 | Yes (~$194/mo) |
| 10% ($35,000) | $315,000 | $2,096 | Yes (~$184/mo) |
| 20% ($70,000) | $280,000 | $1,863 | No |
Factors That Reduce Your Buying Power
- High existing debt (student loans, car payment, credit cards) uses up DTI allowance
- Higher property taxes in your target market
- Condo or HOA with significant monthly fees
- Lower credit score (higher rate = higher payment = lower loan amount you can support)
- Variable income (lenders average self-employment or commission income over 2 years)
Steps to Accurately Determine Your Budget
- Get pre-approved from a lender who will review your actual income, credit, and debts
- Look at the approved monthly payment and ask yourself: is this comfortable with my other financial goals?
- Add taxes, insurance, and PMI to see your true monthly housing cost
- Build in a maintenance reserve of $200–$500/month depending on home age and condition
- If the total number is above 30–35% of your take-home pay, consider looking at lower price ranges
Lender Comparison
| Lender | Est. Rate Range | Min Credit Score | Min Down Payment | Best For |
|---|---|---|---|---|
| LendingTree | Varies by lender | 580 (FHA) / 620 (conv.) | 3.5% (FHA) / 3% (conv.) | Comparing multiple offers at once |
| Rocket Mortgage | Competitive market rates | 580 (FHA) / 620 (conv.) | 3.5% (FHA) / 1% (ONE+ program) | Fast digital approval process |
| Better.com | Competitive market rates | 620 | 3% | Low-fee online experience |
| New American Funding | Competitive market rates | 500 (FHA) / 620 (conv.) | 3.5% (FHA) / 3% (conv.) | Buyers with lower credit scores |
Bottom Line
The answer to “how much house can I afford?” is found by running your actual numbers through a pre-approval, then stress-testing the total monthly cost against your complete financial picture — not just your income.
Get pre-approved on LendingTree to find your real number in minutes.
Also see: Complete first-time buyer guide | How to get pre-approved | Loan type comparison