"How much house can I afford?" is one of the most important financial questions you'll ever ask. The answer shapes your financial life for decades—get it right, and you build wealth in a comfortable home; get it wrong, and you become "house poor," stretching every paycheck just to cover housing costs.
This guide goes beyond simple calculators to help you understand the real factors that determine affordability. You'll learn industry rules, hidden costs most buyers miss, and how to find the sweet spot between the house you want and the life you want to live. Use our free home affordability calculator to run your specific numbers.
The 28/36 Rule Explained
The 28/36 rule is the gold standard for mortgage affordability, used by lenders for decades. It's simple but powerful:
The 28/36 Rule
Front-End Ratio: 28%
Your total housing costs (mortgage, taxes, insurance, HOA) should not exceed 28% of your gross monthly income.
Back-End Ratio: 36%
Your total monthly debt payments (housing + car loans + student loans + credit cards) should not exceed 36% of gross income.
Why These Numbers Matter
The 28/36 rule exists because historical data shows:
- Below 28% housing: Most borrowers can comfortably afford payments and build savings
- 28-33% housing: Manageable but leaves less room for other financial goals
- Above 33% housing: Significantly higher risk of financial stress and default
The Consumer Financial Protection Bureau recommends keeping housing costs below 28% to maintain financial flexibility.
What Lenders Actually Allow
While 28/36 is the conservative benchmark, lenders often approve much higher ratios:
| Loan Type | Max Front-End | Max Back-End (DTI) |
|---|---|---|
| Conventional | 28% | 43-45% |
| FHA | 31% | 43-50% |
| VA | No limit | 41% (guideline) |
| USDA | 29% | 41% |
Important: Just because you qualify doesn't mean you should borrow that much. Lenders don't account for your retirement savings goals, children's education, or the vacation fund you've been dreaming about.
Calculating Your Affordability
Step 1: Calculate Your Maximum Housing Budget
Using the 28% rule:
Maximum Housing Cost = Gross Monthly Income × 0.28
Example: $8,000 gross monthly income × 0.28 = $2,240/month maximum housing cost
Step 2: Subtract Non-Mortgage Housing Costs
Your housing budget must cover more than just principal and interest:
- Property taxes (~1-2% of home value annually)
- Homeowners insurance (~$100-300/month)
- PMI if less than 20% down (~0.5-1% of loan annually)
- HOA fees (if applicable)
Continuing our example:
Budget Breakdown ($8,000/month gross income):
- Maximum housing: $2,240/month
- Property taxes (estimate): -$350/month
- Insurance: -$150/month
- PMI (if applicable): -$150/month
- Available for P&I: $1,590/month
Step 3: Determine Maximum Loan Amount
At 7% interest over 30 years, $1,590/month in principal and interest supports approximately a $239,000 mortgage.
With 20% down, this means a maximum home price of about $300,000.
Use our calculator to find your specific numbers based on your income, debts, and local costs.
Understanding Debt-to-Income Ratio
Your debt-to-income (DTI) ratio is one of the most important factors in mortgage approval. It measures what percentage of your gross income goes to debt payments.
How to Calculate DTI
DTI = (Monthly Debt Payments ÷ Gross Monthly Income) × 100
Include these debts:
- Proposed housing payment (PITI)
- Car loans
- Student loans
- Credit card minimum payments
- Personal loans
- Child support/alimony
Don't include:
- Utilities
- Insurance (unless bundled with loan)
- Groceries and daily expenses
- 401(k) contributions
DTI Example
Example: $96,000 Annual Income ($8,000/month)
- Proposed housing payment: $2,240
- Car loan: $400
- Student loans: $300
- Credit cards: $100
- Total monthly debt: $3,040
DTI = $3,040 ÷ $8,000 = 38%
A 38% DTI falls within acceptable ranges for most loan programs but exceeds the conservative 36% guideline.
DTI Impact on Loan Approval
| DTI Range | Lender View | Loan Impact |
|---|---|---|
| Under 36% | Excellent | Best rates, easy approval |
| 36-43% | Acceptable | Standard approval, may need compensating factors |
| 43-50% | Risky | Limited options, higher rates, FHA may help |
| Above 50% | Very Risky | Most lenders will decline |
How Down Payment Affects Affordability
Your down payment directly impacts how much house you can afford:
Down Payment Comparison
| Down Payment | Loan Amount | PMI | Monthly P&I* |
|---|---|---|---|
| 3% ($12,000) | $388,000 | ~$270/mo | $2,581 |
| 10% ($40,000) | $360,000 | ~$210/mo | $2,395 |
| 20% ($80,000) | $320,000 | $0 | $2,129 |
*Based on $400,000 home at 7% interest, 30-year term
The difference between 3% and 20% down on a $400,000 home is over $700/month when including PMI. That's $8,400/year that could go toward retirement, emergency savings, or home improvements.
When Less Than 20% Down Makes Sense
- Hot markets: Waiting to save 20% means prices may outpace your savings
- Strong cash reserves: You have 6+ months emergency fund after closing
- Fast appreciation: You can eliminate PMI quickly through appreciation
- First-time buyer programs: Down payment assistance may be available
Hidden Costs of Homeownership
The purchase price is just the beginning. According to Bankrate, the true cost of homeownership often surprises first-time buyers.
One-Time Costs (At Closing)
| Cost | Typical Range | On $400K Home |
|---|---|---|
| Closing costs | 2-5% of loan | $8,000-$20,000 |
| Home inspection | $300-$500 | $400 |
| Appraisal | $300-$600 | $500 |
| Moving costs | $1,000-$5,000 | $2,500 |
| Immediate repairs/updates | Varies | $5,000+ |
Ongoing Costs (Annual)
| Cost | Annual Estimate | Monthly |
|---|---|---|
| Maintenance & repairs | 1-3% of home value | $333-$1,000 |
| Utilities (increase from renting) | $1,200-$3,600 | $100-$300 |
| Lawn care/landscaping | $1,200-$3,000 | $100-$250 |
| HOA fees (if applicable) | $1,200-$6,000+ | $100-$500+ |
Pro Tip: The 1% Rule for Maintenance
Budget at least 1% of your home's value annually for maintenance and repairs. A $400,000 home needs at least $4,000/year ($333/month) set aside. Older homes may need 2-3%.
Affordability by Income Level
Here's what different income levels can typically afford using the 28/36 rule:
| Annual Income | Max Monthly Housing | Approx. Home Price* |
|---|---|---|
| $50,000 | $1,167 | $140,000-$175,000 |
| $75,000 | $1,750 | $220,000-$275,000 |
| $100,000 | $2,333 | $300,000-$375,000 |
| $150,000 | $3,500 | $475,000-$575,000 |
| $200,000 | $4,667 | $650,000-$775,000 |
*Assumes 20% down, 7% interest rate, 30-year term, and average property taxes/insurance. Your local market may vary significantly.
Calculate your specific affordability based on your income, debts, and location.
How to Avoid Becoming House Poor
Being "house poor" means so much of your income goes to housing that you can't save, invest, or enjoy life. Here's how to avoid it:
1. Use 25% as Your Target, Not 28%
The 28% rule is the maximum. Targeting 25% gives you breathing room for unexpected expenses, rate increases on variable debts, and lifestyle needs.
2. Factor in Your Full Financial Picture
Lenders don't consider:
- Retirement savings goals (15% of income recommended)
- Children's education costs
- Health care expenses
- Career changes or income variability
- Travel and lifestyle goals
Build these into YOUR affordability calculation, even if lenders don't.
3. Maintain an Emergency Fund
Don't drain savings for your down payment. Keep 3-6 months of expenses liquid for emergencies. A broken furnace in January shouldn't become a financial crisis.
4. Consider Future Expenses
Will your costs increase? Plan for:
- Growing family (bigger utility bills, more space needed)
- Aging parents (potential care costs)
- Property tax increases
- Major replacements (roof, HVAC, appliances)
5. Test Drive Your Budget
Before buying, practice living on your post-purchase budget for 3-6 months:
- Calculate your estimated total housing cost (PITI + maintenance)
- Subtract your current rent
- Put the difference into savings each month
- If you struggle, you've discovered the problem before it's too late
Action Steps Before You Buy
6-12 Months Before
- Check your credit score — 740+ gets the best rates. Dispute errors and pay down balances.
- Calculate your DTI — Pay down debt to get below 36% if possible.
- Build your down payment — Aim for 20% to avoid PMI, but save at least 10%.
- Save for closing costs — Budget 2-5% of purchase price separately.
- Protect your emergency fund — Keep 3-6 months expenses accessible.
1-3 Months Before
- Get pre-approved — Know your actual borrowing limit, not just estimates.
- Shop multiple lenders — Rates vary significantly (get at least 3 quotes).
- Research neighborhoods — Property taxes, insurance, and appreciation vary widely.
- Set your budget below max approval — Leave room for bidding wars and unexpected costs.
Use Our Tools
- Home Affordability Calculator — Find your comfortable purchase price
- Mortgage Payment Calculator — See monthly payments and amortization
- Rent vs Buy Calculator — Compare true costs of each option
- Debt Payoff Calculator — Lower your DTI before applying
The Bottom Line
Determining how much house you can afford requires looking beyond what lenders will approve:
- Follow the 28/36 rule — Better yet, target 25% for housing
- Know your DTI — Keep it under 36% for the best options
- Budget for hidden costs — 1-3% of home value annually for maintenance
- Protect your savings — Don't sacrifice emergency fund or retirement
- Buy below your max — Financial flexibility is worth more than square footage
The right home is one you can afford comfortably while still building wealth and living the life you want. Use our free home affordability calculator to find your number.