Home Affordability Calculator
Find the maximum home price you can afford based on income, debts, down payment, and lender DTI limits, before you start shopping.
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Enter your values above to see the results.
Tips & Notes
- ✓Get a pre-approval letter before shopping — it confirms your actual buying power and signals to sellers that you are a serious buyer who can close.
- ✓Paying down high monthly debt obligations before applying can dramatically increase your maximum home price — $300 less in monthly car payments adds approximately $40,000-$50,000 in buying power.
- ✓The lender maximum is not your personal maximum — budget conservatively at 20-25% of gross income for housing to preserve margin for savings, emergencies, and lifestyle.
- ✓Dual-income households should stress-test affordability on one income — losing one income source while carrying a maximum mortgage payment creates serious financial risk.
- ✓Each 0.5% rise in interest rates reduces buying power by approximately 5% at the same monthly payment — watch rate trends when timing your purchase.
- ✓Property tax rates vary dramatically by location — the same home price in a high-tax state versus a low-tax state can produce a $300-$600 difference in monthly payment.
Common Mistakes
- ✗Confusing lender approval amount with what is financially comfortable — lenders approve the maximum they will lend, not the amount that optimizes your financial life.
- ✗Not accounting for all homeownership costs when budgeting — property taxes, insurance, HOA, maintenance (1-2% of value annually), and utilities add $500-$1,500 per month above the mortgage payment.
- ✗Including variable income like bonuses, overtime, or freelance work in the base income calculation — lenders require 2-year history of variable income and typically average it conservatively.
- ✗Not factoring in the cash needed at closing — a 10% down payment on a $375,000 home requires $37,500 plus 2-5% in closing costs for a total cash need of $45,000-$56,000.
- ✗Applying with high credit card balances — credit utilization above 30% reduces your credit score and may affect the rate you qualify for, increasing the monthly payment and reducing buying power.
- ✗Shopping for homes before getting pre-approved — pre-approval reveals actual buying power and prevents the emotional and financial cost of making an offer on a home you cannot finance.
Home Affordability Calculator Overview
A house affordability calculator translates income, debts, and a down payment into a maximum home price using the same formulas lenders use to approve mortgages. It shows both the front-end DTI (housing costs alone) and back-end DTI (all debt obligations), which are the two gatekeepers lenders use to determine how much they will lend.
Knowing your affordability ceiling before shopping prevents the common and expensive mistake of falling in love with a house you cannot actually finance.
What each field means:
- Annual Income — gross household income before taxes; this is what lenders use, not take-home pay
- Monthly Debts — existing minimum monthly payments on car loans, student loans, credit cards, and other obligations
- Down Payment Pct — percentage of home price you can pay upfront; determines loan amount and whether PMI applies
- Interest Rate — current mortgage rate; use actual pre-approval rate or current market rate
- Loan Term — repayment period; 30-year is standard and produces the highest qualifying home price
- Property Tax Rate — annual rate in your area; included in the front-end DTI calculation
- Annual Insurance — estimated homeowner insurance; also included in front-end DTI
What your results mean:
- Maximum Home Price — the highest price you can afford while meeting standard lender DTI requirements
- Max Monthly Housing — maximum total housing payment (PITI) within lender guidelines
- Down Payment Needed — the cash required at your chosen down payment percentage
- Max Loan Amount — what the lender will finance
- Front-End DTI — housing costs as a percentage of gross income; lenders typically cap at 28-31%
- Back-End DTI — all debt payments as a percentage of gross income; lenders typically cap at 36-43%
Example — $120,000 income, $800 monthly debts, 10% down, 7.0% rate, 1.2% tax, $1,800 insurance:
Monthly gross income: $10,000 Maximum front-end (28%): $2,800/month for housing Maximum back-end (43%): $4,300 total debt — minus $800 existing = $3,500 for housing Binding constraint: front-end at $2,800 Working backward from $2,800 PITI: Maximum loan: approximately $338,000 With 10% down: maximum home price approximately $375,000 Down payment needed: $37,500 Back-end DTI: ($2,800 + $800) / $10,000 = 36%
EX: How existing debt changes the maximum home price ($120,000 income, 10% down, 7.0%) $0 monthly debts: max home price approximately $430,000 $500 monthly debts: max home price approximately $395,000 $800 monthly debts: max home price approximately $375,000 $1,500 monthly debts: max home price approximately $310,000 Every $300 in monthly debt payments reduces maximum home price by approximately $40,000-$50,000.
Maximum home price by income and down payment — 7.0% rate, 28% front-end DTI:
| Annual Income | 5% down | 10% down | 20% down |
|---|---|---|---|
| $80,000 | $268,000 | $280,000 | $310,000 |
| $120,000 | $357,000 | $375,000 | $415,000 |
| $160,000 | $476,000 | $500,000 | $553,000 |
| $200,000 | $595,000 | $625,000 | $691,000 |
Impact of existing debt on maximum home price — $120,000 income, 10% down, 7.0%:
| Monthly Existing Debt | Max Home Price | Reduction vs No Debt |
|---|---|---|
| $0 | $430,000 | baseline |
| $500 | $395,000 | -$35,000 |
| $1,000 | $360,000 | -$70,000 |
| $1,500 | $310,000 | -$120,000 |
Lender affordability is not the same as financial affordability. A lender may approve a payment that consumes 28% of gross income — but after taxes, existing debts, retirement contributions, childcare, and living expenses, the net amount available for housing is often closer to 15-20% of gross income. The maximum price a lender will approve and the maximum price that leaves you financially healthy are frequently very different numbers.
Frequently Asked Questions
Debt-to-income ratio (DTI) is the percentage of gross monthly income that goes to debt payments. Lenders evaluate two DTI measures. Front-end DTI: housing costs (mortgage payment, taxes, insurance, HOA) divided by gross monthly income, typically capped at 28-31%. Back-end DTI: all monthly debt payments (housing plus car loans, student loans, credit cards) divided by gross monthly income, typically capped at 36-43%. The lower of the two constraints determines your maximum loan. Conventional loans from Fannie Mae may approve up to 45-50% back-end DTI with compensating factors like high credit scores and substantial reserves.
At 7% rate with 10% down and 28% front-end DTI: maximum monthly housing of $2,333, corresponding to a maximum home price of approximately $312,000. With 20% down: approximately $347,000. With significant existing debts, the maximum falls further. As a practical guideline: your mortgage payment should not exceed 25% of take-home pay to maintain financial flexibility. On $100,000 gross salary with approximately $72,000 net, 25% of take-home is $1,500/month, suggesting a comfortable price around $200,000-$220,000 depending on taxes and insurance in your area.
Conventional loans generally require a minimum score of 620-640. Scores below 740 may face higher rates. FHA loans accept scores as low as 580 with 3.5% down. VA loans have no strict minimum but most VA lenders require 620 or above. Jumbo loans typically require 700-720 minimum. For the best conventional rates, a score above 760 is ideal. On a $350,000 loan, the rate difference between a 640 score and a 760 score can be 0.5-1.5%, representing $35,000-$100,000 in additional lifetime interest cost.
The minimum down payment depends on loan type: 3% for conventional first-time buyer programs, 3.5% for FHA, and 0% for VA and USDA qualified borrowers. Investment properties require 20-25%. While the minimum is low, 20% eliminates PMI, reduces the loan amount, and typically qualifies for a better rate. The practical trade-off: putting all available cash into a down payment depletes reserves needed for closing costs, repairs, and emergencies. Most financial planners recommend keeping 3-6 months of expenses liquid after closing.
No. Pre-approval shows the maximum a lender will loan you, not the maximum you should borrow. Lenders approve based on gross income and debt ratios without knowing your full financial picture: childcare costs, retirement savings goals, lifestyle expenses, or emergency fund needs. Many financial advisors recommend spending no more than 25% of take-home pay (not gross income) on housing costs. A household approved for a $500,000 mortgage may genuinely afford only $300,000 after all actual expenses are considered.
The full monthly cost extends well beyond the mortgage payment. A $350,000 home with 10% down at 7% has a P&I payment of approximately $2,095. Add: property taxes at 1.2% annually ($350/month), homeowner insurance ($150/month), PMI at 0.5% ($131/month), HOA if applicable ($0-$500/month), and maintenance reserve at 1% of value annually ($292/month). Total monthly cost: approximately $3,018-$3,518 — 44-68% more than the mortgage payment alone. Budgeting only for the mortgage payment is one of the most common and most damaging mistakes first-time buyers make.