Rent vs Buy Calculator

Introduction

This rent vs buy calculator compares two housing paths over the number of years you expect to stay: renting while investing available cash, or buying a home and selling it at the end of the horizon. It combines mortgage payments, rent growth, property taxes, insurance, maintenance, HOA fees, closing costs, selling costs, home appreciation, loan payoff, and investment returns.

The result is not a live market quote or personalized advice. Mortgage rates, tax treatment, insurance, repairs, local transaction costs, and investment outcomes can change materially. Use the calculator to stress-test assumptions, then confirm important numbers with a lender, tax professional, or financial planner before making a housing decision.

How to use

Enter your current rent, a home price, down payment, loan terms, ownership costs, and the number of years you plan to stay. The calculator estimates the buyer's ending position after selling the home and compares it with the renter's investment account, which starts with the cash that would have gone into the down payment and closing costs.

Use the percentage fields as scenario assumptions, not forecasts. Try a conservative case with slower appreciation, higher maintenance, and lower investment returns, then compare it with a more optimistic case. The difference between those scenarios often matters more than a single headline result.

Formula summary

The buyer path estimates mortgage payments, ownership costs, home value growth, remaining loan balance, and sale proceeds after selling costs. The renter path compounds the cash not used for down payment and closing costs, then compares ending renter wealth with the buyer's sale-adjusted equity.

Example to try

Compare $2,200 monthly rent with a $450,000 home, $90,000 down payment, 6.25% mortgage, 3% rent growth, and 3% appreciation over seven years. Then lower appreciation or raise maintenance to test whether the break-even year survives a tougher scenario.

Limitations to check

The model excludes personal tax deductions, capital-gains rules, PMI, refinancing, rent-control details, repair surprises, and live mortgage quotes. Treat it as a scenario comparison rather than a buy-or-rent recommendation.

Formula and method

The monthly mortgage principal-and-interest payment uses the standard fixed-rate amortization formula:

Here M is the monthly payment, P is the loan amount, r is the monthly interest rate, and n is the total number of monthly payments. The calculator also estimates the remaining loan balance at the sale date.

Rent grows once per year. Property tax and maintenance are modeled from each year's estimated home value. The renter's investment account starts with the down payment plus buyer closing costs and receives the monthly cash-flow advantage when renting is cheaper than owning. The buyer receives a side investment account only in months when owning is cheaper than renting. At the end, the calculator compares:

• Renter ending wealth: invested upfront cash plus invested monthly savings.
• Buyer ending wealth: sale price minus remaining loan and selling costs, plus any invested monthly savings.

Worked example

Suppose rent is $2,200 per month and grows 3% per year. A comparable home costs $450,000 with a $90,000 down payment, 3% buyer closing costs, a 6.25% fixed mortgage, 1.1% property tax, 1% maintenance, $125 monthly HOA fees, $1,600 annual insurance, 3% annual home appreciation, 6% selling costs, and a 5% investment return.

Over seven years, the calculator compares the renter's investment path with the buyer's expected net sale proceeds after paying down the mortgage. The recommendation depends on the spread between those ending positions, not just whether the mortgage payment is higher or lower than rent in the first month.

Assumptions and limitations

• No tax modeling. Mortgage interest deductions, property tax deductions, capital gains exclusions, income tax, and local rules are excluded.
• No PMI or loan fees. Add those costs indirectly by raising the mortgage rate, monthly HOA field, insurance field, or closing cost rate if needed.
• Constant rates. Rent growth, appreciation, investment return, taxes, and maintenance are simplified into annual assumptions.
• Sale at the horizon. The comparison assumes the buyer sells at the end of the modeled period and pays the selling cost rate entered.
• Investment discipline assumed. The renter and buyer are assumed to invest any monthly cash-flow advantage rather than spend it.

Interpreting the result

A large positive buyer advantage suggests ownership may be financially stronger under your assumptions. A large renter advantage suggests renting and investing may preserve more flexibility and wealth. A small difference is a gray zone: moving plans, job stability, school needs, repair risk, liquidity, and comfort with debt can matter more than the modeled dollars.

FAQ

Does this calculator use current mortgage rates?

No. Enter the mortgage rate you want to test, such as a lender quote or a conservative planning rate. The calculator does not fetch live rate data.

Does the result include tax deductions?

No. Personal tax effects vary by jurisdiction, filing status, loan size, itemization, and sale timing, so they are excluded from this general model.

What does the break-even year mean?

It is the first modeled sale year when buying ends with at least as much estimated wealth as renting and investing, using the same assumptions.