Rent vs. Buy a Home Decision Engine
Compare buying a home vs. renting and investing the down payment difference over time.
Long-term US national average is approx 3.5% - 4.5%.
Expected stock market return for investing downpayment.
How long you plan to occupy/own the home before moving.
What is the Rent vs. Buy a Home Decision Engine?
The Rent vs. Buy a Home Decision Engine helps individuals and families evaluate the long-term financial trade-offs of homeownership versus renting. Standard advice says 'renting is throwing money away,' but that ignores the high costs of home insurance, property taxes, interest, maintenance, and transaction costs. This tool compares buying a home against renting a similar property and investing the down payment and monthly savings surplus into index funds over your target holding timeline.
How Does the Rent vs. Buy a Home Decision Engine Work?
1. Enter Purchase Price — Target home price and your down payment percentage.
2. Provide Mortgage Rates — Current annual interest rate for a 30-year fixed loan.
3. Enter Monthly Rent — Rental cost for a similar home in your market.
4. Configure Assumptions — Set expected annual home appreciation and index fund stock market returns.
5. Set Time Horizon — The number of years you plan to stay in the home before selling.
6. Compare Wealth Results — Analyze which scenario builds more net wealth at year-end.
Formula & Calculation Method
Comparative Wealth Equations:
- Monthly Owner Outflows: Monthly Mortgage (P&I) + Property Taxes (1.2% / 12) + Maintenance (1.0% / 12) + Insurance (0.3% / 12)
- Home Buyer Wealth: Future Appreciated Home Value - Remaining Loan Balance - Selling Costs (6% agent fees)
- Renter Wealth: Down Payment Invested (compounded at stock rate) + Monthly Cash Flow Savings difference (Owner Outflow - Rent) invested monthly over the target horizon.
Example Calculation
Example: Buying a $400,000 home (20% down, 6.5% interest) vs renting for $2,000/mo. Appreciation = 4%, stock market returns = 8% over a 10-year horizon.
- Down Payment: $80,000 | Loan Amount: $320,000
- Monthly Owner Cost: $2,022 mortgage + $400 tax + $333 maint + $100 ins = $2,855/mo
- Buyer Wealth (Year 10):
- Appreciated Home Value = $592,098 | Remaining mortgage = $270,175
- Net buyer equity (minus 6% selling costs of $35.5k) = $286,423
- Renter Wealth (Year 10):
- $80k down payment invested at 8% = $172,714
- Saving the $855/mo difference ($2,855 owner cost - $2,000 rent) invested at 8% = $158,540
- Net renter wealth = $331,254
- Winner: Renting is the financial winner by $44,831 over 10 years because investing cash in stocks outcompetes home appreciation and mortgage interest.
Frequently Asked Questions
**Comparative Wealth Equations:** - **Monthly Owner Outflows:** Monthly Mortgage (P&I) + Property Taxes (1.2% / 12) + Maintenance (1.0% / 12) + Insurance (0.3% / 12) - **Home Buyer Wealth:** Future Appreciated Home Value - Remaining Loan Balance - Selling Costs (6% agent fees) - **Renter Wealth:** Down Payment Invested (compounded at stock rate) + Monthly Cash Flow Savings difference (Owner Outflow - Rent) invested monthly over the target horizon.
Disclaimer: This tool is provided for informational and calculation purposes. Output values are estimates based on standard user inputs.