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

If you're deciding this fall, run one calculation before you open any rent vs buy calculator: divide the purchase price by twelve months of rent on a comparable place. Under 15, buying usually wins inside five years. Over 20, renting and investing the difference almost always wins, because at Freddie Mac's 6.66% average on the 30-year fixed as of August 27, 2026, interest and transaction costs swallow the equity you'd build. The national ratio sits near 18.4 right now, using the National Association of Realtors' median existing-home price of $434,100 in July 2026 and Zillow's typical U.S. asking rent of $1,962 a month. That's the murky middle, which means the answer turns on your zip code, your horizon, and what your down payment would earn somewhere else.

Quick answer

• Price-to-rent under 15 leans buy, 15 to 20 is a coin flip, over 21 leans rent. National figure: 18.4 ($434,100 NAR median price divided by $23,544 of annual rent at Zillow's $1,962 typical asking rent).
• Model 6.66% on a 30-year and 5.98% on a 15-year, Freddie Mac's Primary Mortgage Market Survey averages for the week of August 27, 2026.
• Budget roughly 10% of the price for the round trip. Buyer closing costs commonly run about 2%, and Zillow and Opendoor both put seller costs including agent compensation at 8% to 10% of the sale price.
• The quoted payment is about 71% of the real cost. On the median home with 20% down, principal and interest run $2,232 a month, but taxes, insurance and maintenance push the all-in number past $3,100.
• Breakeven at today's national numbers is roughly seven years only if a comparable rental costs $2,879 or more, or if the house appreciates 5.1% a year. Below that, the renter who invests the down payment stays ahead.

Price-to-rent beats every gut feeling you have about this

The ratio does one useful thing: it converts a house into a yield. Price divided by annual rent is the inverse of what a landlord earns before expenses, so a ratio of 12 means the property throws off about 8.3% gross, and a ratio of 25 means 4%. When the ratio climbs past 20, you're paying a price that only makes sense if the property appreciates, because the shelter it delivers is cheap relative to the capital it consumes.

Compute it with rent for the actual substitute, not the national average. If you'd buy a three-bedroom house in Mesa but you'd rent a two-bedroom apartment, those are different products and the ratio is meaningless.

And be careful with the 18.4 national figure. NAR's median price reflects homes that sold, heavily single-family. Zillow's index reflects asking rents across apartments and houses. Mixing the two gives you a directional read on the country, not a verdict on your street. Your own number, house against house, is the one that matters.

The numbers this decision runs on, September 2026

Two of those rows deserve a second look. Zillow's affordability gap says a household needs about $21,000 more in annual income to carry the typical mortgage than the typical rental, which is the whole rent-versus-buy debate compressed into one line. The concession rate is the other: nearly four in ten listed rentals were dangling free weeks or waived fees in July, so the rent you negotiate may be meaningfully below the rent you see advertised.

Seven years in the median home, line by line

Here's the full arithmetic on the national medians. Purchase price $434,100. Twenty percent down is $86,820, leaving a $347,280 loan at 6.66%, which is $2,231.71 a month in principal and interest. Add property tax at 1.0% of value, insurance at 0.5%, and maintenance at 1.0% (my assumptions, and you should swap in your county's real rate), and the carrying cost lands at about $3,136 a month in year one. Buyer closing costs at 2% add $8,682 on day one.

Now hold it seven years, with the house appreciating 2.0% a year, matching NAR's latest year-over-year price change.

• Interest paid over 84 months: $155,011. Principal paid down: $32,452.
• Home value in year seven: $498,644. Selling costs at 8%: $39,892.
• Net equity after the sale: $143,925.
• Total cash out the door, including the purchase closing costs: about $276,800.

The renter in the same period pays $1,962 rising 2.3% a year, which totals $178,480 and reaches $2,301 a month by year seven. That renter also starts with the $95,502 the buyer sank into the down payment and closing costs, invests it at 5%, and adds the monthly cash-flow difference, which begins at $1,174 a month.

Result: the renter's portfolio hits $243,124 against the owner's $143,925 in equity. The gap is roughly $99,200 in the renter's favor.

Does that settle it? No, and here's why it doesn't. The comparison assumes a $434,100 house and a $1,962 rental deliver the same thing, and they don't. Solve the model backwards instead: the rent that produces a seven-year tie is $2,879 a month, a price-to-rent ratio of 12.6. If a house you'd genuinely be happy in rents for more than that, buying wins on a seven-year horizon. If it rents for less, renting wins. The alternative path to a tie is appreciation of 5.1% a year, roughly two and a half times the current national pace.

Drop the assumed investment return from 5% to 3% and the tie moves to $2,694 of rent, a ratio of 13.4. That single input swings the answer by $185 a month, which tells you how much of this fight is really about the down payment.

Your down payment is a working asset, and most calculators forget that

Eighty-six thousand dollars parked in a house earns exactly the appreciation rate on the whole property, amplified by the mortgage. Eighty-six thousand in a brokerage account earns whatever the market pays and stays liquid. That amplification cuts both ways: a 2% gain on $434,100 is 10% on your equity, and a 2% decline is a 10% loss plus 8% in selling costs if you have to move.

That's why the breakeven horizon is the real output of any rent vs buy calculator, not the monthly payment comparison. At a 10% round-trip transaction cost and 2% appreciation, the house has to be held about five years just to cover the cost of buying and selling it before you've earned a dollar.

Short answer to the question everyone actually asks: if there's a real chance you move within four years, rent. The transaction costs alone will eat you.

Where the standard advice breaks

"Renting is throwing money away" is a weak argument, and the interest column is why. Year one on the median home sends $23,015 to the lender and $3,765 to your own balance sheet. Add tax, insurance and maintenance at roughly $904 a month and the owner is spending about $33,800 a year on costs that build nothing, versus $23,544 for a renter at the typical asking rent. The equity story starts strong only when the loan is small or the rate is low.

The tax deduction argument is weaker than it was. Mortgage interest only helps if your itemized deductions clear the standard deduction, and for most married couples buying a median-priced home with a modest state tax bill, they don't by much. Run your actual Schedule A before you count on it.

But there's a real case for buying that spreadsheets underweight. Rent has risen 2.3% over the past year and keeps compounding, while a fixed-rate principal and interest payment is frozen for 30 years. Twelve years out, the renter in this example is paying about $2,520 a month and climbing. The owner is still paying $2,231.71. If you're confident you'll stay a decade or more in one metro, that frozen payment is a genuine hedge, and it's worth accepting a ratio near 18 to get it.

Mistakes that flip the answer

1. Comparing a mortgage payment to rent. The payment is 71% of the cost. Compare all-in carrying cost to rent, or you're off by more than $900 a month on the median home.
2. Ignoring the exit. Zillow and Opendoor both put seller costs at 8% to 10%. On a $498,000 sale that's up to $50,000, and it's the single largest line item in the whole comparison.
3. Setting the investment return to zero. Calculators that don't invest the down payment make owning look inevitable. It isn't.
4. Using national rent for a local decision. Price-to-rent ratios range from single digits in parts of the Midwest to well past 30 on the coasts. One number cannot cover both.
5. Assuming maintenance is optional. Roofs, HVAC and water heaters arrive on their own schedule, and a year with two of them wipes out a year of appreciation at 2%.
6. Waiting for rates to fall. NAR's Lawrence Yun has pointed to a market that would be thriving near 6%, and every buyer thinking the same thing arrives at the same time. Cheaper money bids prices up.

What to do this week

Pull three specific numbers. First, the asking price of a house you'd actually buy. Second, the monthly rent on the closest available substitute, after concessions, since 39.8% of listings were offering them. Third, divide.

Then get a rate quote from at least three lenders on the same day, because the 6.66% survey average is a national mean and your quote will vary by credit score, points and lender. Take that quote into a rent vs buy calculator that lets you set the investment return, the holding period and the selling cost, and change the holding period until the lines cross. That crossing year is your answer.

If your breakeven lands past the year you honestly expect to move, sign the lease and put the down payment to work.