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Rent vs Buy Calculator

The rent vs buy question is one of the most consequential financial decisions most people make - and one of the most commonly misunderstood. Most comparisons stop at the mortgage payment vs rent. This calculator goes further: it accounts for the equity you build, the home appreciation you gain, the opportunity cost of your down payment (what it could earn if invested instead), and all the costs of owning that renters avoid. Enter your situation and see when buying actually becomes cheaper than renting.

What you currently pay (or equivalent rent)

Historical US average: 3-4%

Opportunity cost of your down payment

Comparison period

Enter the home price and current monthly rent to compare the cost of renting vs buying.
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This calculator provides estimates based on your inputs and general assumptions. Property markets, interest rates, and investment returns vary significantly. This is not financial or legal advice. Consult a qualified financial adviser before making major housing decisions.

How to use this tool

  1. 1Enter the home price, down payment percentage, mortgage rate, and loan term.
  2. 2Enter the monthly rent you currently pay (or would pay for an equivalent property).
  3. 3Set the annual home appreciation rate - 3% is a reasonable long-term historical average for the US; adjust for your local market.
  4. 4Set the investment return rate - this is the opportunity cost of your down payment. A balanced portfolio has historically returned 6-8% annually.
  5. 5Adjust property tax percentage, maintenance, and insurance if they differ from the defaults.
  6. 6Choose a comparison period (5, 10, 20, or 30 years) and read the break-even year and net cost comparison.

Formula used

Net cost of buying over N years = total mortgage payments + total taxes + insurance + maintenance + buying closing costs - home equity (home value minus remaining loan balance). Net cost of renting = total rent paid - opportunity cost of down payment (down payment x (1 + investment return rate)^N - down payment). Break-even year is the first year where net cost of buying falls below net cost of renting.

Example

400,000 home vs 2,500/month rent, 7% mortgage, 10-year horizon

Home: 400,000. Down: 20% (80,000). Mortgage: 7%, 30 years. Monthly payment: 2,129. Rent: 2,500/month. Appreciation: 3%/year. Investment return: 7%/year. At 10 years - equity built: ~128,000. Net cost of buying: ~196,000. Net cost of renting: ~208,000 (rent) minus ~72,000 (opportunity cost of 80K down payment) = ~136,000. Renting is cheaper at 10 years in this scenario. Break-even: year 14.

Same scenario but rent is 3,200/month

With rent at 3,200/month, renting costs ~384,000 over 10 years. After subtracting the 72,000 opportunity cost = ~312,000 net rent cost. Net buying cost ~196,000. Buying is cheaper by year 6. High rent dramatically shortens the break-even year.

Common use cases

  • First-time buyers deciding whether to rent and invest or buy a home now
  • Renters in high-cost cities comparing paying high rent vs buying a cheaper property further out
  • Families planning a move in 3-5 years checking whether buying is worth it for a short time horizon
  • Financial planners modelling housing decisions as part of a client's overall wealth strategy
  • People returning to a city after time away deciding whether to buy immediately or wait

Common mistakes

  • Forgetting the opportunity cost of the down payment - investing 80,000 at 7% for 10 years grows to 157,000; that is a real cost of buying that most comparisons miss.
  • Using the mortgage payment as the full cost of buying - taxes, insurance, and maintenance often add 30-50% more per month.
  • Assuming rent stays flat - the calculator uses static rent for simplicity; in practice rents rise 2-4% annually, which strengthens the case for buying.
  • Ignoring transaction costs - buying and selling a property costs 5-8% of the purchase price in commissions and closing costs; for short hold periods these dominate the comparison.

Frequently asked questions

What is a rent vs buy break-even year?

The break-even year is when the total net cost of buying (cumulative mortgage payments plus taxes, insurance, and maintenance, minus the equity built) equals the total net cost of renting (cumulative rent paid minus the returns you could have earned by investing the down payment). Before the break-even year, renting is cheaper. After it, buying is cheaper.

Why does the calculator show renting as cheaper even when the mortgage payment is less than the rent?

Because buying involves costs beyond the mortgage: property taxes (typically 1-2% of home value per year), homeowner insurance, and maintenance (typically 1% per year). These can add hundreds of dollars per month. Also, the down payment you invest in the home could be earning investment returns instead.

What home appreciation rate should I use?

The US national average home appreciation is roughly 3-4% per year over the long term. High-demand cities like New York or San Francisco have seen higher rates historically, while many suburban and rural markets are closer to 2-3%. Local data from your county assessor or a real estate agent gives a more accurate figure.

Is renting always throwing money away?

No. Rent buys housing, just as a mortgage payment buys housing plus equity. Renters who invest their down payment and the difference between their rent and the full ownership costs can build significant wealth. Whether buying or renting builds more wealth depends on local prices, rent levels, time horizon, and investment discipline.

How accurate is the calculator?

The calculator models the main financial components of the rent vs buy decision with standard formulas. It uses simplified assumptions (constant rent, linear appreciation). Real results depend on actual market movements, your specific tax situation, and personal circumstances. Treat the output as a directional estimate, not a precise forecast.

Does the calculator include the mortgage interest tax deduction?

No. The tax treatment of mortgage interest and property taxes varies significantly by country, income level, and whether you itemise deductions. For US residents who itemise, the deduction can reduce the effective cost of homeownership. Consult a tax adviser for your specific situation.

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