Rent vs buy: separate cash flow from investment return
A clearer way to compare renting and ownership without pretending one annual number settles the decision.
Editorial review: Oct 15, 2026 · Educational content · No sponsored recommendations
Cash flow answers one question
Comparing annual rent with mortgage, taxes and maintenance tells you which option requires more cash under the assumptions entered. That matters for affordability, but it does not measure wealth creation.
Mortgage principal is unusual
Part of a mortgage payment reduces debt and increases equity. From a cash-flow perspective the money leaves your account, but from a net-worth perspective it is partly a transfer from cash to home equity. This is why a simple ownership-minus-rent figure should not be called a complete economic cost.
Transaction costs can dominate short stays
Buying and selling can involve legal fees, taxes, agent fees, inspections, repairs and moving costs. If you expect to move soon, those transaction costs may outweigh small annual differences between rent and ownership.
Opportunity cost matters
A down payment tied up in a property cannot simultaneously be invested elsewhere or kept liquid. That foregone alternative is real, even though it never appears as a bill. A complete investment comparison needs an assumption for alternative returns.
Run ranges, not predictions
Property appreciation, rent increases, maintenance and interest rates are uncertain. Use multiple scenarios and focus on whether the decision remains acceptable when assumptions move against you.