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Guide · Real Estate

Rent vs Buy: The Math That Actually Decides It (2026)

Compare renting and buying with upfront cash, monthly costs and assets after sale. A seven-year example shows how comparable rent can change the result.

George Robinson
Updated September 7, 2026 · 4 min read
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Rent versus buy is a comparison of housing costs, money tied up at the start, and assets left at the end of the same period. Compare homes that would genuinely substitute for each other. A national sale-price median divided by a national asking-rent index cannot tell you which choice works for a particular home or household.

Correction — September 7, 2026: We have removed universal price-to-rent cutoffs and claims that buying wins after a fixed number of years. The replacement separates a reproducible hypothetical example from market forecasts and states how investment returns, cash-flow differences and sale costs are treated.

Start with comparable housing and a realistic horizon

Match location, size, condition and amenities before comparing price with rent. Include any recurring parking, pet or association charges that differ between the alternatives. If the rental is smaller or in a different school district, show that as a different choice rather than claiming identical housing for less.

The CFPB's buying considerations include stable finances, repair costs and the risk that falling prices make an early move difficult. Flexibility, control over the property and the likelihood of moving matter alongside the financial projection. There is no universal five- or seven-year answer.

Price-to-rent is purchase price divided by 12 months of comparable rent. For a $400,000 home and $2,800 monthly rent, it is 11.9. That number omits financing, upkeep, transaction costs and returns on retained cash; it is a description, not a decision rule.

What the comparison must include

For buying, separate the down payment from nonrecoverable closing costs, monthly principal from interest, and sale proceeds from outstanding debt. Include taxes, insurance, maintenance and any HOA fees. The CFPB's budget guidance explains these ownership costs. Use the Loan Estimate for property- and loan-specific estimates.

For renting, include rent increases, renters insurance and other charges, then track the money not spent upfront and the ongoing cash-flow difference. Investing that difference is an explicit behavior assumption. A quoted stock-market return is not cash in the bank: Investor.gov describes stock losses and volatility. An investment account can be accessible while still being worth less when you need it.

A seven-year example with three rents

Every row below uses the same hypothetical $400,000 home, 20% down, 2% buyer closing costs, a $320,000 loan at 6.50% fixed for 30 years, and sale immediately after payment 84. Initial buyer cash is $88,000. Monthly principal and interest is $2,022.62, calculated at full precision internally. None of these inputs is a current lender offer or national forecast.

Assume annual home appreciation and rent growth of 2%. Taxes, insurance and maintenance together equal 2.5% of the home's value at the start of each year, paid evenly monthly. There is no HOA or PMI. Selling costs are an illustrative 6% of sale value, not a standard commission. Renter insurance is a fixed $20 monthly. Utility and moving costs are assumed equal and excluded; deposits, tax effects, investment fees and unusual repairs are excluded.

The renter starts with the buyer's $88,000 upfront cash invested at an assumed 5% effective annual return, converted to a monthly rate as 1.051/12 − 1. Each month it earns that return, then receives the owner's modeled housing outflow minus the renter's outflow. A negative difference is withdrawn from the portfolio, so the model does not ignore months when renting costs more. This compares equal household cash budgets; it assumes sufficient portfolio funds and a smooth return path that real markets do not promise.

Starting monthly rentBuyer net equity after saleRenter investment balanceBuyer minus renter assets
$2,200.00$142,573.83$179,457.69-$36,883.86
$2,800.00$142,573.83$116,029.38$26,544.44
$3,400.00$142,573.83$52,601.08$89,972.75

The modeled sale value is $459,474.27. After the assumed sale costs and $289,331.98 mortgage payoff, the owner has $142,573.83. These are net sale proceeds, not profit: the buyer also committed upfront cash and monthly payments. The renter's ending portfolio likewise is not investment profit; it includes retained cash and the signed monthly differences.

In the $2,800-rent row, owning ends $26,544.44 ahead under these assumptions. In the $2,200 row, renting ends $36,883.86 ahead. A change in comparable rent flips the answer while the home, loan and holding period remain identical. Neither result predicts actual local appreciation, investment performance or household behavior.

Stress-test the assumptions before choosing

  • Earlier sale: rerun the full calculation at the likely move date; do not divide transaction costs by annual appreciation and call that break-even.
  • Lower appreciation or investment returns: test both sides. Leverage magnifies changes in home equity, while investment losses can reduce the renter's available cash.
  • Higher repairs, taxes or insurance: fixed-rate principal and interest stays fixed, but ownership costs do not.
  • Different rent path: the next renewal might differ from the smooth annual percentage in a model.

A return on the down payment is only part of the comparison; the monthly differences and exit costs matter too. Conversely, adding mortgage principal to costs without recognizing the lower payoff balance understates the owner's ending assets. Keep cash-flow and asset accounting consistent.

Tax and personal constraints can change the result

Tax deductions and home-sale exclusions have eligibility rules. IRS Publication 936 explains mortgage-interest deductions and limits; Topic 701 explains qualifying home-sale exclusions. Do not assume either a full tax subsidy for ownership or tax-free investment growth. The table deliberately makes a before-tax comparison rather than estimating an individual return.

Even a favorable projection does not supply the cash to close or pay for a major repair. Use our affordability guide to check monthly resilience and our emergency-fund guide to consider reserves. The decision needs to remain workable when the expected case does not happen.

Primary sources
  1. CFPB's buying considerations
  2. CFPB's budget guidance
  3. Loan Estimate
  4. Investor.gov describes stock losses and volatility
  5. IRS Publication 936
  6. Topic 701

Reviewed September 7, 2026. Calculations are illustrative and use the stated assumptions. How we report.

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Frequently asked
What price-to-rent ratio means I should buy?
No ratio guarantees that buying is better. Purchase price divided by annual comparable rent leaves out financing, upkeep, transaction costs and investment returns. Use it as an input to a complete comparison.
How many years does it take buying to beat renting?
There is no universal break-even year. The result depends on comparable rent, purchase and sale costs, financing, appreciation, investment returns and monthly cash flows. A model may not reach break-even during your expected holding period.
Does a fixed mortgage payment make ownership costs fixed?
Only the principal-and-interest payment is fixed in this fixed-rate example. Property taxes, insurance, maintenance and association charges can change. Compare the whole housing budget with rent.
Why invest the down payment in a rent-versus-buy comparison?
It accounts for the cash the renter does not commit upfront. The example also adds or withdraws the monthly spending difference. Its smooth 5% effective annual return is hypothetical; actual returns and losses can change the outcome.
Does the mortgage-interest deduction make buying cheaper?
An eligible deduction can change the tax comparison, but eligibility, itemization and debt limits matter. Do not assume the full interest payment becomes an additional tax saving. The example excludes tax effects for both choices.