The Rent vs Buy Decision
“Should I rent or buy?” is one of the most financially significant questions you will face. The conventional wisdom that buying is always better is misleading — the right answer depends on your local housing market, how long you plan to stay, your opportunity cost of capital, and dozens of other variables. This calculator models both paths side by side so you can compare them with your actual numbers.
Buying a home builds equity through mortgage paydown and (potential) appreciation, but comes with substantial costs that renters avoid: closing costs, maintenance, property taxes, insurance, and the opportunity cost of a large down payment. Renting avoids those costs but offers no equity accumulation — however, the money you save by renting can be invested elsewhere, often in diversified index funds that historically outperform housing appreciation.
Understanding Breakeven
The breakeven point is the number of years it takes for buying to become cheaper than renting in total cost. In most markets, buying has higher upfront and early-year costs (closing costs, the interest-heavy early mortgage payments, and the opportunity cost of the down payment). Over time, the buyer's costs stabilize while rent increases, and equity accumulation tilts the balance toward ownership.
If you plan to move before the breakeven point, renting is likely the better financial choice. If you plan to stay well beyond it, buying typically wins. The breakeven analysis in this calculator accounts for all recurring costs, investment returns on savings, and net equity at sale after closing costs.
The Opportunity Cost of a Down Payment
When you make a down payment, that money is no longer available to invest elsewhere. On a $400,000 home with 20% down, that is $80,000 locked into a single, illiquid asset. If that $80,000 were instead invested in a diversified index fund returning 7-8% annually, it could grow substantially over the same period.
This calculator models the renter's investment path: instead of a down payment, the renter invests that capital and continues investing the monthly savings (if renting is cheaper month-to-month). The net worth comparison chart shows both paths over time, giving you an honest view of total wealth accumulation under each scenario.
Key Factors That Affect the Outcome
Home price appreciation is the single largest variable. Even a 1% difference in annual appreciation dramatically shifts the outcome over 10-30 years. The long-run national average is roughly 3-4% per year, but local markets vary enormously.
Rent growth matters too. If rents rise faster than home costs, buying looks better over time. The historical national average for rent growth is about 3% per year, but hot markets can see 5-8% annually for stretches.
Mortgage rate and investment return form a tug-of-war. When mortgage rates are low and investment returns are high, the opportunity cost of buying increases (the renter's investment grows faster). When mortgage rates are high, the buyer pays more interest but the comparison depends on whether investments keep pace.
How to Use This Calculator
Enter your monthly rent and a comparable home purchase price. The calculator pre-fills current mortgage rates, property tax estimates based on your state, and reasonable defaults for maintenance, insurance, and investment returns. Adjust any input to match your specific situation.
The results show a monthly cost comparison, a net worth trajectory chart, and a breakeven analysis. The verdict at the top summarizes which option builds more wealth over your chosen time horizon.
FAQ
- Is buying always better than renting in the long run?
- Not necessarily. In expensive markets with high price-to-rent ratios (like San Francisco or New York), renting and investing the difference can outperform buying over 10+ years. The answer depends on local prices, rent levels, mortgage rates, and how long you stay. This calculator shows you the math for your specific situation.
- What is the price-to-rent ratio and why does it matter?
- The price-to-rent ratio is the home price divided by the annual rent for a comparable property. A ratio below 15 generally favors buying, 15-20 is a gray area, and above 20 often favors renting. For example, a $400,000 home that would rent for $2,000/month has a ratio of 16.7 ($400,000 / $24,000).
- What costs does this calculator include?
- For buying: mortgage principal and interest, property taxes, homeowners insurance, PMI (if applicable), maintenance, and closing costs at purchase and sale. For renting: monthly rent with annual increases, renter's insurance, and the investment return on the capital that would otherwise go to a down payment. Both paths model investment growth on monthly savings.
- Should I factor in tax deductions for mortgage interest?
- The mortgage interest deduction only helps if you itemize deductions, which fewer people do since the standard deduction was nearly doubled in 2018. For many buyers, especially those with mortgages under $400,000, the standard deduction is larger. This calculator does not model tax deductions to keep the comparison straightforward — if you do itemize, buying may look slightly better.
- How does the time horizon affect the decision?
- Time horizon is one of the strongest predictors. Buying has large upfront costs (closing costs, moving, furnishing) that take years to recoup. Most analyses show buying becomes favorable after 5-7 years in an average market. If you might move within 3-4 years, renting is almost always the safer financial choice.
- What investment return should I assume for the renter?
- A diversified stock index fund has returned about 7-8% after inflation historically. For a conservative estimate, use 6-7%. For a more aggressive assumption, use 8-10%. The calculator lets you adjust this to see how it changes the outcome. Even a 1% difference compounds significantly over a 10-30 year horizon.