A Fair Comparison Tracks Both Cash Costs and Ending Assets
Buying ties up down-payment and closing cash that could otherwise remain invested, while renting avoids some ownership costs but can have changing rent. The calculator tracks those competing cash flows rather than comparing rent with mortgage principal and interest alone.
At the end of the selected horizon, homeowner wealth depends on modeled property value, selling costs and the remaining loan balance. Renter wealth depends on the alternative-investment assumptions. Results can change materially with appreciation, investment return, maintenance, taxes and transaction costs.
Rent-versus-buy comparisons are sensitive because housing decisions involve both cash flow and wealth tied up in the property. A down payment is not simply an expense: it becomes equity, but it also has an opportunity cost because the money could have been invested elsewhere. Selling costs, maintenance, appreciation, rent growth and the remaining mortgage balance can all change the result. The most useful approach is to test several realistic holding periods rather than looking for one permanent answer to whether renting or buying is 'better.'
Frequently Asked Questions
Why is the down payment treated as an opportunity cost?
Cash committed to the home is no longer available for the alternative investment path used in the comparison.
Does the calculator assume buying always wins after a certain number of years?
No. The result depends on the entered housing, financing, appreciation, rent and investment assumptions.
Why can the answer change when I change how long I plan to stay?
Upfront purchase and selling costs are spread over the ownership period. Appreciation, loan paydown, rent increases and alternative investment growth also accumulate differently as the time horizon changes.
Methodology & Related Tools
Review how RatioCalc builds, tests and updates calculator models before using an estimate for a material decision.
Accuracy review
Real Estate family audit: .
Site-wide consistency review: September 4, 2026.