What Inputs Does This Calculator Use?
The calculator requires several inputs to build accurate projections. Each plays a specific role in the comparison:
Home Price
The purchase price of the home you're considering. This determines your loan amount, property taxes, insurance costs, and maintenance estimates.
Down Payment
The upfront cash you'll pay. A larger down payment reduces your loan amount and may eliminate PMI. This money represents the "opportunity cost" for renters who invest it instead.
Mortgage Rate (APR)
The annual interest rate on your home loan. Higher rates increase your monthly payment and total interest paid over the loan term.
Monthly Rent
Your current or expected rent payment. The calculator compares this (plus rent increases over time) against total homeownership costs.
Property Tax Rate
Annual property tax as a percentage of home value. Varies by location (0.5% to 2.5% in most U.S. markets). Taxes increase as your home appreciates.
Maintenance Rate
Annual maintenance as a percentage of home value. We default to 1%, though older homes may require 1.5-2%. This is a cost renters avoid.
Home Appreciation Rate
Expected annual increase in home value. Historical U.S. average is 3-4%. Higher appreciation favors buying; stagnant markets favor renting.
Rent Growth Rate
Expected annual rent increase. Typical range is 2-5%. Higher rent growth accelerates the break-even point for buying.
How Does This Calculator Compare Renting vs Buying?
The calculator runs a year-by-year simulation comparing cumulative costs. Here's the step-by-step process:
Calculate Monthly Ownership Costs
We compute mortgage principal and interest using standard amortization, then add property taxes, homeowners insurance, maintenance, PMI (if applicable), and HOA fees.
Calculate Monthly Renting Costs
We start with your rent amount and apply annual increases. Renters insurance and utilities are added if specified.
Model Opportunity Cost
We assume renters invest their down payment and any monthly savings. These investments grow at 7% annually (historical stock market average). Homeowners forfeit these returns.
Track Equity Growth
For homeowners, we track home appreciation and principal paydown. Your equity grows as your home value increases and mortgage balance decreases.
Find the Break-Even Year
The break-even point is when cumulative buying costs (minus equity gains) drop below cumulative renting costs. Before this point, renting wins. After, buying wins.
What Assumptions Does This Calculator Make?
Because we project up to 30 years into the future, certain assumptions are necessary. These are the default values in our model:
- Home Appreciation: 3.5% annually (U.S. historical average)
- Stock Market Returns: 7% annually (inflation-adjusted S&P 500 average)
- Rent Growth: 3% annually
- Maintenance: 1% of home value per year
- Closing Costs: 3% of home price
- Loan Term: 30-year fixed mortgage
What's Included
- Principal & Interest
- Property Taxes & Insurance
- PMI (Private Mortgage Insurance)
- HOA Fees & Maintenance
- Tax Deductions (Estimated)
- Closing Costs
- Investment Compounding
What's Excluded
- Emotional/Lifestyle Value
- Utility & Moving Costs
- Selling Costs (6-8%)
- Home Improvements
- Rental Income (House Hacking)
- Sequence of Returns Risk
What Are the Limitations?
Every financial model has limitations. Understanding these helps you interpret results appropriately:
Market Volatility
We use average returns, but markets fluctuate. A stock market crash or housing downturn would significantly alter actual results. Projections show expected outcomes, not guaranteed ones.
Tax Law Changes
We estimate tax benefits based on current federal standards. Changes to the mortgage interest deduction or standard deduction would affect the math.
Life Changes
The calculator assumes you stay for the period you input. Job relocations, family changes, or other life events might force an earlier move than planned.
Local Variations
Real estate is hyper-local. National averages may not reflect your specific market. Always customize inputs based on local property taxes, appreciation, and rent trends.