Every rent-vs-buy calculator on the internet asks the same question: is your mortgage payment lower than your rent? That is the wrong question. The right question is: over the next 5, 10, or 15 years, which choice builds more wealth after accounting for every dollar that flows in and out? That includes the opportunity cost of your down payment, transaction costs on both ends, property taxes that never stop, maintenance you cannot skip, and the investment returns you forgo by locking $60,000 to $200,000 into a single illiquid asset.
The monthly payment comparison is about 20% of the real analysis. The other 80% is what this calculator actually models.
The real formula behind rent vs buy
Forget the napkin math. The honest comparison requires modeling two parallel wealth trajectories over your expected holding period.
"Monthly savings" is the difference between the total cost of ownership (mortgage + taxes + insurance + maintenance + HOA) and rent. When buying costs more per month, the renter invests that difference. When renting costs more, the buyer gets credit for the savings. The calculator above runs both paths simultaneously and shows you who wins, by how much, and when the crossover happens.
Why the NY Times calculator gets it wrong
The NY Times rent-vs-buy calculator is the most cited tool in this space. It is also quietly biased toward buying, and the bias hides in two default assumptions.
First, it defaults to a conservative investment return for the renter's alternative. If your down payment would earn 4% to 5% in bonds, buying looks good. If it would earn 8% to 10% in equities (the actual long-run average of the S&P 500), the math shifts hard toward renting in many markets.
Second, it uses a home appreciation rate (often 3% to 4% nominal) that sounds modest but actually exceeds the real (inflation-adjusted) historical average by 2x to 3x. Robert Shiller's data shows U.S. homes have appreciated about 1% annually in real terms since 1890. That 3% to 4% nominal figure bakes in 2% to 3% inflation, which also affects the renter's costs (rent goes up), but does not affect the renter's invested down payment the same way.
Correct both defaults and the break-even rent, the price at which buying and renting produce identical outcomes, moves 15% to 25% lower. Suddenly, renting looks a lot more competitive in expensive metros.
Opportunity cost: the variable everyone ignores
A 20% down payment on a $500,000 home is $100,000. That is not money that disappears when you rent instead. It is money that can work in the market.
The home needs to generate more than $115,892 in net equity (after selling costs, after subtracting all the non-equity payments you made) to beat the renter's invested down payment. At 3.5% annual appreciation, that $500,000 home is worth $705,000 in 10 years. Your equity after paying down the mortgage and subtracting 6% selling costs is roughly $310,000. You put in $100,000 plus 10 years of payments above what rent would have cost. The renter invested $100,000 plus those same monthly savings.
The answer depends on the spread between home appreciation and investment returns, on the gap between total ownership cost and rent, and on the tax treatment of each. No shortcut captures this. You have to run the numbers.
When renting wins (with real numbers)
Renting beats buying in specific, predictable conditions. Here are the patterns.
| Scenario | City example | Why renting wins |
|---|---|---|
| High price-to-rent ratio | San Francisco (ratio 25-30x) | Median home $1.2M, median rent $3,800/mo. All-in ownership cost is $7,800+/mo. The $240K down payment invested at 8% grows to $518K in 10 years. Renter invests $4,000/mo in monthly savings on top. |
| Short time horizon (<5 years) | Any market | Transaction costs of 8% to 10% round-trip ($32K to $40K on a $400K home) eat most or all of 3 to 4 years of equity building and appreciation. |
| High interest rates + flat appreciation | Chicago ($320K median, 2% appreciation) | At 7.25%, 73% of year-1 mortgage payment is interest. Slow appreciation means the home barely outpaces the closing costs. Renter's invested capital compounds faster. |
| Rent-controlled unit | New York City, San Francisco, Los Angeles | If your rent is $2,200 in a market where comparable units are $3,400, you have a $14,400/year subsidy. Buying forfeits that advantage permanently. |
When buying wins (with real numbers)
Buying beats renting in a different set of conditions, and they are just as specific.
| Scenario | City example | Why buying wins |
|---|---|---|
| Low price-to-rent ratio | Houston (ratio 14-16x) | $320K home, $2,200/mo rent. All-in cost of $2,500/mo is close to rent. You build equity instead of enriching a landlord, with minimal cash flow penalty. |
| Long time horizon (10+ years) | Most markets | Transaction costs amortize. Mortgage paydown accelerates after year 10. Fixed payment gets cheaper in real terms while rents climb 3% to 4% annually. |
| High-appreciation market (entered early) | Nashville 2015-2022 (8%+ annual appreciation) | Leverage amplifies gains. 20% down on a home that appreciates 8%/year means 40% return on equity in year 1. No stock index matches leveraged real estate returns in a bull market. |
| Low rate environment (locked in) | Buyers who locked 2.75% to 3.5% in 2020-2021 | Monthly payment is 40% lower than today's equivalent. The mortgage is now a wealth-building instrument, not a cost. Rents have risen 20% to 30% since then. |
The 5-year rule, explained and stress-tested
The conventional wisdom says: do not buy unless you plan to stay at least 5 years. The logic is sound. Buying a $400,000 home costs roughly $12,000 to $16,000 in closing costs. Selling it costs another $22,000 to $28,000 in agent commissions, transfer taxes, and prep. Total round-trip: $34,000 to $44,000.
In the first 5 years of a 7% mortgage, you pay down about $25,000 in principal on a $320,000 loan. If the home appreciates 3.5% annually, you gain roughly $75,000 in value. So your gross equity position is $100,000 in down payment + $25,000 in paydown + $75,000 in appreciation = $200,000, minus $40,000 in transaction costs = $160,000 net.
Not bad. But if you had invested that $80,000 down payment at 8% for 5 years, you would have $117,500. Plus the monthly savings from cheaper rent, invested monthly. The result is close, and highly sensitive to the appreciation rate. At 2% appreciation, the renter wins at year 5. At 5% appreciation, the buyer wins. The calculator shows this crossover point so you can see exactly where your scenario falls.
The investor's lens vs the homeowner's lens
An investor and a prospective homeowner should run this calculation differently, because they are optimizing for different things.
The investor is comparing risk-adjusted returns. A $100,000 down payment in a rental property versus $100,000 in an index fund versus $100,000 in a REIT. The investor cares about cash-on-cash return, total return including appreciation, and liquidity. For an investor, the rent-vs-buy question is really: does buying this property as an investment beat my alternative deployment of capital? Use the rental property analyzer for that analysis.
The homeowneris comparing total housing cost over time. Stability matters: a fixed mortgage payment does not increase, while rent does. Lifestyle matters: you can renovate, paint, and add a deck. Forced savings matters: mortgage paydown builds equity automatically, while investing the difference requires discipline most people do not have. The homeowner's decision legitimately includes non-financial factors that no calculator captures.
This calculator handles the financial side. The non-financial side is yours.
Appreciation assumptions will make or break your analysis
Change the home appreciation rate by 1 percentage point and the 10-year outcome swings by $50,000 to $80,000. This single input has more influence on the result than any other variable, and it is the one you have the least certainty about.
| Appreciation rate | $400K home value at year 10 | Equity gained from appreciation | Historical precedent |
|---|---|---|---|
| 1% | $441,600 | $41,600 | Real (inflation-adjusted) national average since 1890. |
| 3% | $537,600 | $137,600 | Nominal national average. Roughly matches inflation + real appreciation. |
| 5% | $651,600 | $251,600 | Strong markets like Dallas, Phoenix, Tampa over 2015-2022. |
| 8% | $863,600 | $463,600 | Peak boom markets (Austin 2019-2022). Not sustainable for a decade. |
The difference between 1% and 5% appreciation is $210,000 in equity over 10 years on a single $400,000 property. Anyone who tells you the rent-vs-buy answer is obvious has already baked in an appreciation assumption they are not telling you about. The calculator makes this assumption explicit so you can test it.
Tax implications: less valuable than you think
The mortgage interest deduction is the most overhyped financial benefit in American real estate. Here is why.
The 2017 tax reform raised the standard deduction to $29,200 for married filers (2024). You only benefit from the mortgage interest deduction if your total itemized deductions exceed the standard deduction. For a $400,000 home at 7%:
Add $8,000 in property taxes (capped at $10,000 SALT deduction) and $2,000 in state income tax. Total itemized: $32,400. That is only $3,200 above the standard deduction. At a 24% marginal rate, the incremental tax savings from homeownership is about $768 per year.
On a $700,000 home, the benefit is larger: maybe $3,000 to $5,000 annually. On a $300,000 home, there is often zero benefit because you never exceed the standard deduction. The calculator models this based on your actual numbers instead of assuming a tax benefit that may not exist.
Price-to-rent ratio: the quickest way to gauge your market
Before you run a full analysis, check your local price-to-rent ratio. Divide the median home price by the annual rent for a comparable property.
| Ratio | What it signals | Example cities |
|---|---|---|
| < 15 | Buying strongly favored. Ownership cost is close to rent. | Detroit, Cleveland, Memphis, Birmingham |
| 15 - 20 | Buying slightly favored. Run the full calculation to be sure. | Houston, Indianapolis, San Antonio, Phoenix |
| 20 - 25 | Toss-up. Outcome depends heavily on time horizon and appreciation. | Denver, Nashville, Austin, Portland |
| > 25 | Renting favored. Buying only wins with aggressive appreciation or 10+ year hold. | San Francisco, New York, San Jose, Los Angeles |
A price-to-rent ratio above 20 does not mean you should never buy. It means the financial case for buying requires a specific thesis (long hold period, high appreciation, locked-in low rate) rather than being obvious from the basic math.
The behavioral argument for buying (and why it matters)
Here is the uncomfortable truth that pure financial analysis misses: most renters do not actually invest the difference. They spend it. A compound interest calculator shows beautiful renter wealth trajectories, but those trajectories assume perfect investment discipline every single month for a decade or more.
Homeownership is a forced savings mechanism. The mortgage payment builds equity whether you feel like saving that month or not. The Federal Reserve's Survey of Consumer Finances consistently shows homeowner median net worth at 40x to 80x that of renters. That is not because homes are amazing investments. It is because mortgages force savings while checking accounts do not.
If you are the kind of person who will genuinely invest $1,500/month into index funds every single month for 10 years without touching it, the renter's path may be financially optimal. If you are honest that you will spend some of that money on vacations and cars, buying forces the discipline that renting does not. The calculator assumes perfect investment discipline for the renter. Discount that assumption to match your actual behavior.
A worked example: Denver, $450,000 home vs $2,200/mo rent
Let us run the full comparison for a real scenario.
Buyer: $450,000 home, 20% down ($90,000), 7% rate on a 30-year fixed. Monthly mortgage: $2,395. Property taxes: $350/mo. Insurance: $150/mo. Maintenance: $375/mo (1% of value). Total monthly cost: $3,270.
Renter: $2,200/mo rent, increasing 3.5%/year. Invests the $90,000 down payment at 8%. Invests the $1,070/mo difference ($3,270 minus $2,200) at 8%.
At 5% appreciation, the gap narrows fast. At 6%, the buyer overtakes the renter around year 12. At 3.5% (the national average), the renter holds the lead for 15+ years. The crossover depends almost entirely on that appreciation assumption. Plug your city's numbers into the calculator above to find your answer.
How to think about this as a mortgage decision
Interest rates change the entire calculation. At 3.5% (2020 rates), buying was financially superior in almost every U.S. metro because the monthly cost of owning was often lower than rent. At 7%+ (2024-2026 rates), the monthly ownership cost is 50% to 80% higher than it was, while rents have grown more modestly.
This creates a rate-dependent decision matrix. If you are comparing at 7% and expect to refinance at 5.5% within 3 to 4 years, buying is more attractive because your effective cost over the holding period is lower than the current rate implies. If rates stay at 7% for a decade, many markets that favored buying at 3.5% now favor renting.
The calculator uses your current rate for the full holding period by default. If you expect to refinance, you can model the lower rate and compare both scenarios.
Frequently asked questions
Is it cheaper to rent or buy in 2026?
It depends on the city and how long you stay. In San Francisco, renting and investing the $240,000 down payment at 8% beats buying a $1.2M home by $150,000+ over 7 years. In Houston, a $320,000 home at $2,400/mo all-in costs barely more than renting, and the buyer builds equity faster. There is no universal answer. The city, hold period, and what you do with the down payment determine the outcome.
How does opportunity cost of the down payment affect the rent vs buy decision?
This is the variable most calculators underweight. A 20% down payment on a $400,000 home is $80,000. Invested at 8% annually, it grows to roughly $173,000 in 10 years. The home needs to appreciate beyond that, after transaction costs, for buying to win. In slow-appreciation markets like Chicago or Cleveland, the invested down payment frequently comes out ahead.
What is the 5-year rule for buying a house?
The 5-year rule is a rough guideline that says you should only buy if you plan to stay at least 5 years. The logic: buying comes with 5% to 6% in transaction costs on both ends (agent commissions, closing costs, transfer taxes). If you sell before year 5, those costs eat most or all of the equity you built. In high-appreciation markets, you might break even at year 3 or 4. In flat markets, you might need 7 years. The real threshold depends on your purchase price, closing costs, interest rate, and local appreciation rate. The calculator above shows the exact crossover point for your inputs rather than relying on a one-size-fits-all heuristic.
Why does the NY Times rent vs buy calculator give misleading results?
The NY Times calculator is well-built but makes two assumptions that skew toward buying. First, it uses a relatively modest opportunity cost assumption for the down payment, often defaulting to 4% to 5% returns rather than the 8% to 10% long-run equity average. Second, it applies a generous home appreciation assumption (3% to 4%) without adjusting for the fact that real home prices, after inflation, have averaged about 1% annually over the last century (per Robert Shiller's data). When you correct both of those inputs, the break-even rent threshold shifts significantly. It does not mean the calculator is wrong, but the defaults tilt the result. Always adjust opportunity cost and appreciation to match your actual alternatives.
How do tax benefits affect the rent vs buy calculation?
Less than most people think. The 2017 Tax Cuts and Jobs Act raised the standard deduction to $29,200 for married couples in 2024. For a $400,000 home at 7% interest, first-year mortgage interest is roughly $26,000. Add $6,000 in property taxes (capped at $10,000 SALT) and you get $36,000 in potential deductions. That is only $6,800 above the standard deduction, saving you maybe $1,700 to $2,400 in taxes depending on your bracket. On a $700,000+ home, the benefit is larger. On anything under $350,000, most buyers take the standard deduction anyway and get zero incremental tax benefit from homeownership. The calculator above models this correctly rather than using the inflated pre-2017 math.
Does renting mean throwing money away?
No. Renting means paying for shelter, the same way buying means paying for shelter plus interest, taxes, insurance, maintenance, and transaction costs. A homeowner with a 7% mortgage pays more in interest over the first 10 years than the entire principal they pay down. Property taxes never stop. Maintenance runs 1% to 2% of home value annually. The 'throwing money away' framing ignores that roughly 60% to 70% of a new mortgage payment goes to non-equity costs in the early years. Renters who invest the difference between renting and the total cost of ownership often build more liquid wealth than homeowners, especially in high-cost markets. Homeownership is a forced savings mechanism, which has real behavioral value, but calling rent 'wasted' is financially illiterate.
What appreciation rate should I assume when comparing renting vs buying?
The national long-run average for nominal home appreciation is about 3.5% to 4%, and about 1% after inflation (per the Case-Shiller index going back to 1890). Individual markets vary wildly. Austin appreciated 10%+ annually from 2015 to 2022, then dropped 15% in 2023. Detroit barely kept pace with inflation over the same period. Using 3% to 4% nominal is reasonable for a 10-year projection in most markets. Using 5%+ is aggressive and should only reflect a specific thesis about a specific market. Using 2% is conservative but matches the post-inflation historical reality. The calculator lets you adjust this so you can see how sensitive the outcome is to this single assumption. Spoiler: it is very sensitive.
How does the length of stay change the rent vs buy math?
Length of stay is the most important variable after price and rent. Over 3 years, buying almost never wins because transaction costs ($25,000 to $50,000 on a $400,000 home) dominate the math. Over 10 years, buying usually wins in average-appreciation markets. The crossover point typically falls between year 4 and year 8 depending on appreciation, rates, and the renter's investment discipline.