The honest guide to buying versus renting

Almost everyone who tells you to buy a house makes money when you do. Mortgage lenders earn on the loan. Agents earn on the sale. Listing platforms earn on the transaction. The financial media earns on the aspiration. This doesn’t make them villains, but it does mean that most of the advice you’ve absorbed about buying a home was produced by people with a stake in your answer.

This guide has no stake in your answer. It walks through the buy-versus-rent decision the way the arithmetic actually works, including the parts the industry tends to leave quiet. The calculator does the math for your specific numbers; this explains what the math is doing and why the honest version often disagrees with the version you’ve heard.

The question you’re actually asking

Most people approach this as: can I afford the monthly payment?

If the mortgage, taxes, and insurance fit inside your income, the thinking goes, buying is sensible. But “can I afford it” is the wrong question, because you can afford a great many things that quietly make you worse off. You can afford to tie up your savings in an illiquid asset. You can afford to become unable to move for a job. You can afford to stop investing because the house ate the money you’d have invested.

The real question is: in the number of years I’ll actually stay, will buying leave me wealthier and more flexible than renting and investing the difference?

That’s a harder question, and the answer is more often “no” than the culture admits — not because buying is bad, but because the honest comparison includes costs the cheerful version skips.

”Renting is throwing money away” — the myth that does the most damage

You’ve heard it. Renting is throwing money away; a mortgage payment builds equity; owning is how normal people build wealth.

There’s a grain of truth in it, and it’s worth being precise about where the grain is. The truth isn’t that renting is financially inferior. The truth is that buying forces a kind of savings discipline — every mortgage payment quietly converts some income into equity, whether or not you’d have had the discipline to save it otherwise. Renting offers no such force. The renter who would invest the difference comes out ahead in many scenarios; the renter who spends the difference does throw money away, exactly as the saying claims.

So the saying is really a statement about discipline, not about real estate. If you know yourself well enough to admit you wouldn’t actually invest the money you’d save by renting, then the folk wisdom applies to you, and buying’s forced savings is a genuine point in its favor. If you’re someone who would invest the difference, the saying is just marketing.

The calculator assumes you invest the difference — it has to assume something, and that’s the version that lets you see the real comparison. But you should adjust the result in your head for your honest read of your own discipline.

The trap: comparing monthly payments instead of wealth

Here is the single most common error, the one that nearly every quick calculator commits.

They compare your monthly mortgage payment to your monthly rent. If the mortgage is close to the rent, buying looks like a steal — after all, the mortgage builds equity and the rent doesn’t.

But the monthly payment isn’t the cost of owning. The cost of owning also includes property tax, insurance, maintenance, the mortgage interest that isn’t building equity, and — this is the one nobody mentions — the return you gave up on the money you sank into the down payment and closing costs.

That last one is the quiet killer. A $100,000 down payment isn’t free. Invested in a broad stock index at a long-run return, it would grow substantially over the years you’d own the home. Every year you own instead of rent-and-invest, you’re forgoing that growth. Most calculators treat the down payment as if it materialized from nowhere and costs nothing. The honest comparison treats it as what it is: capital with an opportunity cost.

When you account for all of it — not the monthly payment, but the total wealth you’d hold on each path — the answer frequently flips from what the monthly comparison suggested.

The five costs that change the answer

The honest defaults in the calculator are higher than the ones friendlier calculators use, because they reflect what these things actually cost.

Maintenance is roughly 1.5% of the home’s value every year, averaged over time. Not the occasional $200 repair — the real long-run figure, including the roof you’ll replace once, the HVAC system that dies, the water heater, the appliances, the surprises. On a $500,000 home that’s around $7,500 a year. A calculator that lets you set maintenance to “$50/month” is helping you lie to yourself.

Selling costs are 5–6% of the sale price. Realtor commissions, title fees, transfer taxes, the repairs you make to sell. On a $500,000 sale that’s roughly $30,000, gone the moment you decide to leave. Most calculators omit this entirely, treating your home’s value as money you can simply pocket. You can’t.

Closing costs to buy are 2–3% of the purchase price — origination, title insurance, inspection, appraisal, prepaid taxes — paid on day one, on top of the down payment. This is part of why a buyer who sells within a couple of years almost always loses: they pay to get in and pay to get out, and there’s been too little time for anything to make up the difference.

The down payment’s opportunity cost is the invisible one, covered above — the market return you forgo by sinking the capital into the home instead of investing it.

The mortgage tax benefit is, for most people now, zero. This surprises people, so it gets its own section.

The tax benefit that mostly doesn’t exist anymore

For decades, “you can deduct your mortgage interest” was a real reason to buy. Since 2018, for most middle-class buyers, it isn’t.

The 2017 tax law roughly doubled the standard deduction — to around $29,000 for a married couple in recent years (it adjusts upward with inflation annually). To get any benefit from deducting mortgage interest, your itemized deductions have to exceed that standard deduction, and for most people with a typical mortgage, they don’t. So most buyers take the standard deduction, get no specific benefit from their mortgage interest, and the “tax advantage of owning” turns out to be a benefit they’re not actually receiving.

The calculator computes this honestly for your specific income, filing status, and state. For a lot of people, it will tell you the tax benefit of buying is essentially zero — which is the truth, and which most calculators won’t say because it makes buying look worse.

The one number that should drive your decision: the crossover year

If you remember nothing else from this guide, remember this.

Buying has large up-front costs (closing costs, the transaction friction) and large exit costs (selling costs). Those costs are spread across however long you stay. Stay one year and they’re crushing. Stay thirty years and they’re trivial.

So there’s often a year — the crossover year — at which buying finally overtakes renting-and-investing. Before that year, renting wins. After it, buying wins. The calculator shows this year directly in your results, and it’s the most decision-relevant number it produces.

Here’s the part the friendly calculators won’t tell you: with honest costs, that crossover often arrives later than you’d expect, and sometimes it doesn’t arrive at all. In a moderately priced market it might land somewhere in the range of seven to fifteen years. In an expensive market — a high price-to-rent ratio, where homes cost a lot relative to what they’d rent for — the calculator may tell you buying never overtakes renting within thirty years. That “never” isn’t a glitch; it’s the honest answer for that market, and it’s an answer most tools are structured to avoid showing you. If you see it, take it seriously.

The practical reading is simple. If you’re confident you’ll stay past your crossover year, buying’s case is strong. If there’s real chance you’ll move before it — a job, a relationship, a city you’re not sure about — or if the calculator shows no crossover at all, renting is very likely the better financial choice, regardless of how the monthly payment compares.

The honest version of the buy-vs-rent decision is, to a first approximation, a question about how long you’ll stay. Most other factors are smaller than this one.

When buying genuinely wins

None of this is an argument against buying. There are clear scenarios where the math favors owning:

You’ll stay well past the crossover year. The price-to-rent ratio in your market is low — homes are cheap relative to what they’d rent for. You have a stable situation where the forced-savings discipline of a mortgage genuinely helps you. Rents in your area are rising fast, so locking in a housing cost has real value. You value the control and permanence of owning enough that some financial cost is worth paying for it — which is a legitimate thing to value, as long as you know that’s the trade you’re making.

When several of these are true, the calculator will show buying ahead, often comfortably. The point was never that renting always wins. The point is that you should know which case you’re actually in.

When renting genuinely wins

And the scenarios where renting plus investing comes out ahead:

You might move within several years. The market is expensive relative to rents (a high price-to-rent ratio). You’d be stretching to make the down payment, leaving you cash-poor and unable to invest. You’re in a career or life stage where flexibility has real value. You’d actually invest the difference rather than spend it.

In these cases the honest math frequently favors renting by a wide margin — and being a renter here isn’t a failure to launch or money thrown away. It’s the financially stronger position, even though the culture will tell you otherwise.

What the math can’t see

The calculator compares wealth. It cannot compare the things that don’t fit in a spreadsheet, and those things are real.

Owning a home can mean stability, a place that’s yours, freedom to renovate, a sense of rootedness, a thing to hand to your children. Renting can mean freedom, lower stress, the ability to leave a bad situation, time not spent on maintenance. People buy homes for reasons that have nothing to do with net worth — and that can be entirely correct. A home is not only an investment; it’s where your life happens.

So treat the math as one input, not the verdict. If the calculator shows renting ahead by a modest margin but owning a home would genuinely make your life better, buying anyway is a reasonable, adult choice — as long as you’re making it with your eyes open about the financial trade. What this guide and this calculator are trying to prevent isn’t homeownership. It’s buying a home under the impression that it’s a financial slam-dunk when, for your specific situation, it quietly isn’t.

See the math clearly. Then decide like a whole person.

How the calculator works — the full method

The remainder of this guide documents exactly what the calculator does with your inputs — every formula, every default, every limitation — so you can audit the numbers yourself. If a tool claims honest math, it should be willing to show its work.

The core question

Most buy-vs-rent calculators ask: “Will my monthly mortgage cost less than my monthly rent?”

That’s the wrong question. It ignores everything the down payment could have earned in stocks, what selling the house actually costs, how much real maintenance runs on a real house, and the fact that the standard deduction has been so high since 2018 that most middle-class buyers no longer get any tax benefit from the mortgage interest deduction.

This calculator asks: “In N years, will I have more total wealth if I buy this home, or if I rent and invest the difference?”

That’s the only fair comparison. Both paths produce a wealth outcome. We compare wealth outcomes.

The math

Setting up the two paths

The buyer’s starting position (year 0):

Pays down payment + closing costs in cash
Receives a home worth its purchase price
Has equity equal to the down payment
Has zero investable cash

The renter’s starting position (year 0):

Keeps the down payment + closing costs invested in stocks
Pays rent monthly

This is the source of the day-one trap most calculators hide: the buyer paid (down payment + closing costs) but their net position is (equity − selling costs), because if they sold immediately, they’d owe realtor commission and transaction fees. The renter, having paid nothing, keeps every dollar. The buyer starts behind by roughly the closing costs plus the selling costs.

Mortgage payment

Standard 30-year amortization:

monthly_PI = principal × (rate/12 × (1+rate/12)^360) / ((1+rate/12)^360 - 1)

The calculator computes this once at the start, then walks through 360 months tracking how much of each payment is interest vs. principal. The interest portion declines every month; the principal portion grows every month. This matters for the tax benefit calculation (only mortgage interest is deductible).

Each year, the buyer pays

Mortgage payment (principal + interest) — fixed for 30 years, then $0
Property tax = home value × property tax rate, recomputed each year as home value grows
Maintenance = home value × maintenance rate (default 1.5%) — see the maintenance section below
Insurance + HOA = monthly figure × 12, growing 3% per year (inflation)
PMI = mortgage balance × 0.7%, only when down payment < 20% AND mortgage balance > 80% of original price
Minus tax benefit (see tax section below)

Each year, the renter pays

Rent = starting monthly rent × 12 × (1 + rent growth rate)^(year - 1)

The investing-the-difference rule

Whichever path costs less in a given year, that path’s saver invests the difference. This is symmetric:

In early years, buying is usually more expensive than renting (the mortgage + everything else adds up), so the renter invests the difference.
In later years, rent has compounded past the fixed mortgage payment, and buying becomes cheaper monthly. Now the buyer invests the difference.

Both portfolios grow at the expected investment return (default 7%/year — the long-run real return on the US stock market). When wealth is realized at the user’s chosen horizon, gains are reduced by the long-term capital gains tax (15%).

Most calculators only have the renter invest. That’s asymmetric and biased. This one models both.

Wealth at horizon

Buy path wealth at year N:

home_value(N) − mortgage_balance(N) − selling_costs(N) + buyer_portfolio_post_LTCG(N)

Rent path wealth at year N:

renter_portfolio(N) post_LTCG

The verdict is whichever number is higher.

The honest defaults

Most calculators let you adjust these to fantasy values. This one defaults to reality and explains why.

Maintenance: 1.5% of home value, annually

The long-run rule of thumb among real-estate professionals is 1–2% of home value per year, averaged across a 10–30 year ownership. This sounds high until you think about it: roof replacement (≈$15K every 20–30 years), HVAC (≈$8K every 15 years), water heater (≈$2K every 10–12 years), appliances, paint, landscaping, plumbing repairs, foundation work, and the occasional surprise that costs $5K to fix.

If a calculator lets you set maintenance to 0.3% ($1,500/year on a $500K home), it’s helping you lie to yourself.

Selling costs: 6% of sale price

Realtor commission (typically 5–6%) plus title fees plus transfer taxes plus repairs needed to sell plus possible staging. On a $500K sale, that’s $30,000 vanishing the moment you decide to leave.

Most calculators omit this entirely. They treat “home value” as if you can pocket all of it on sale. This calculator subtracts selling costs every time it computes wealth-if-sold-today.

Closing costs: 2.5% of purchase price

Origination fees, title insurance, inspection, appraisal, prepaid taxes, recording fees. On a $500K home, that’s ≈$12,500 paid on top of the down payment.

This is the buyer’s $0-day cost that the renter doesn’t have.

Property tax: 1.2%, annually (US median)

Recomputed each year against the current home value (which grows). The US median property tax rate is about 1.2% of home value. Texas and New Jersey are much higher (≈2–2.5%). California and Hawaii are lower (≈0.7%).

Limitation: This calculator uses current market value each year. California’s Proposition 13 (and similar laws in some other states) caps annual assessed-value growth at 2% — so a long-tenure California homeowner’s effective property tax rate falls over time relative to the home’s market value. This calculator overstates property tax in those states for long-tenure owners.

Home appreciation: 3%, annually

Long-run US average, nominal. Recent decades (2010–2024) saw substantially higher appreciation in many markets, but the long-run real average is closer to 1% above inflation. Three percent nominal is a conservative middle ground — recent years were hotter, the next decade may not be.

Rent growth: 3%, annually

Roughly matches inflation. Rent has historically grown roughly with inflation in most US markets, though specific cities (Austin, Phoenix, parts of NYC) have seen periods of much faster growth. The default is the long-run average; adjust if your market is unusual.

Insurance + HOA growth: 3%, annually

Inflation. Insurance has actually been growing faster than inflation in some areas (especially climate-exposed regions: Florida, California wildfire zones, coastal areas). The 3% default may understate this risk; consider scenario-testing 5%+ if you’re in such a market.

Investment return: 7%, annually

The long-run real return on the broad US stock market (S&P 500 with dividends reinvested) is roughly 7% over multi-decade periods. This is what the renter’s “investing the difference” portfolio grows at. It’s an average across boom years and crash years; actual sequences differ materially.

Limitation: Real-world investors rarely achieve full market returns — they pay fees, panic-sell during downturns, miss the best days. Conservative scenario testing with 5% is reasonable.

PMI: 0.7% of loan balance, annually (when down payment < 20%)

Private Mortgage Insurance is required by most lenders when down payment is below 20%. Typical rates range from 0.5% to 1.5% depending on credit score and down payment. The 0.7% default is a middle estimate.

PMI drops off automatically when the mortgage balance reaches 80% of the original home price — that’s the threshold mandated by the federal Homeowners Protection Act of 1998.

Tax treatment

This is where the calculator does its most distinctive work, because most calculators get this wrong in a way that systematically favors buying.

The post-TCJA reality

The Tax Cuts and Jobs Act of 2017 (effective 2018) roughly doubled the standard deduction:

Single: $14,600 (2024)
Married filing jointly: $29,200 (2024)

It also capped the State and Local Tax (SALT) deduction at $10,000 combined (state income tax + property tax + state sales tax, whichever you choose).

Before 2018, most middle-class homeowners itemized. After 2018, most don’t — the standard deduction beats their itemized total. So the “mortgage interest deduction” that calculators tout often produces zero tax benefit.

How this calculator computes tax benefit

It computes the MARGINAL benefit of buying — what owning the home adds to your deductions beyond what you’d already have as a renter:

renter_itemized = MIN(state_income_tax, $10,000)
renter_excess_over_std_deduction = MAX(0, renter_itemized − standard_deduction)

buyer_itemized = mortgage_interest + MIN(state_income_tax + property_tax, $10,000)
buyer_excess_over_std_deduction = MAX(0, buyer_itemized − standard_deduction)

marginal_tax_benefit = MAX(0, buyer_excess − renter_excess) × marginal_federal_rate

The honest math: in most middle-class scenarios, the renter doesn’t itemize at all (their state income tax alone doesn’t beat the standard deduction). Buying adds mortgage interest, which can push their total over the standard deduction. The tax benefit is how much of the buyer’s itemizing actually beats what the renter would have done — multiplied by the marginal rate, not the effective rate.

Counterintuitive result you may notice

High-state-tax users (California, New York, New Jersey) often get more federal tax benefit from buying than zero-state-tax users (Texas, Florida). This sounds backwards but it’s correct:

The TX user has no state income tax. Their SALT is just property tax (capped at $10,000). Their itemized total = mortgage interest + property tax.
The CA user has high state income tax. The $10,000 SALT cap is fully consumed by state income tax. Their itemized total = mortgage interest + $10,000 (cap hit).

The CA user’s itemized total is higher because they fill the SALT cap regardless. So the marginal benefit of adding the mortgage is larger.

(This says nothing about the CA user’s overall tax burden — they pay much more in state taxes, which the renter ALSO pays. We’re isolating the buy-vs-rent differential.)

Limitations of the tax treatment

AMT (Alternative Minimum Tax) — Ignored. Affects high-income earners with large deductions.
NIIT (Net Investment Income Tax) — Ignored. Adds 3.8% to investment income for high earners.
Mortgage interest deduction cap — The TCJA capped MID at interest on $750K of mortgage principal. This calculator doesn’t apply the cap, so it slightly overstates tax benefit for mortgages above $750K.
State property tax deduction on state returns — Some states allow property tax deduction on state returns. This calculator only models federal.
State capital gains tax — The 15% long-term capital gains rate is federal only. State capital gains can add 0–13% depending on state.

For high-income filers in high-tax states with large mortgages, real outcomes can differ from this model by several thousand dollars per year. The directional result (buy vs rent) is usually unchanged; the absolute dollar differences are approximations.

What this model is not

It is not financial advice

It is a wealth-comparison tool. The decision to buy or rent involves factors no math can capture: stability vs flexibility, the psychological weight of debt, family considerations, neighborhood, what owning a home means to you culturally. Use the math as one input, not the whole decision.

It is not tax advice

For tax questions specific to your situation, consult a CPA. The tax treatment here is a reasonable approximation but the real tax code is more intricate than any calculator can capture.

It assumes you actually invest the difference

The rent path’s wealth depends on the renter actually saving and investing the monthly difference. In practice, most renters spend the difference instead. This is where the “renting is throwing money away” folk wisdom has its real grain of truth — not because renting is mathematically inferior, but because the discipline required to capture renting’s mathematical advantage is harder than the discipline required to make mortgage payments.

If you know yourself well enough to honestly say you wouldn’t invest the savings, the rent path’s wealth shown by this calculator is a ceiling, not a forecast. Adjust your mental model accordingly.

It uses long-run averages, not your specific scenario

Stock returns vary wildly year to year. Home appreciation varies by region and decade. Rent growth varies by city. The 30-year projection uses smooth averages because we can’t predict the actual sequence. Real outcomes will differ.

The most important limitation here is sequence risk: a 30% market crash in year 1 affects the renter’s portfolio much more than a 30% crash in year 25. The same crash in different years produces very different wealth outcomes. This calculator’s average-return projection smooths over this entirely.

It doesn’t model “you never sell”

The wealth comparison subtracts selling costs at the user’s chosen horizon, assuming you sell at that point. If you stay forever, you never realize the home equity but also never pay selling costs — that’s a different comparison. The 30-year projection is most useful for users who genuinely expect to move within that window.

It assumes you could rent equivalent housing

A 4-bedroom house in a school district may not have a rental equivalent. Some markets are dominated by buying; others by renting. The calculator’s “monthly rent for equivalent housing” assumes such an equivalent exists and you’ve researched its price honestly. If you’re comparing a house you want to buy against an apartment you’d rent instead, you’re comparing different living standards, not just buying vs renting.

Why this approach instead of a simpler calculator

A simpler buy-vs-rent calculator could give you an answer in five seconds with three inputs. There are many of those online. They’re often wrong in ways that systematically favor whatever the calculator’s owner wants you to do (frequently: buy, because the calculator is hosted by a mortgage company or realtor).

This one is longer because honest math requires more inputs. Property tax really does vary 3× across US states. Selling costs really are 6%, not zero. The standard deduction really did change in 2018 in a way that erased the mortgage tax benefit for most people. State income tax really does interact with the SALT cap in ways that affect the answer.

Hiding these makes a calculator easier to use and less accurate. We made the trade in the other direction.

How the math is verified

This calculator’s logic is verified against a parallel implementation in a spreadsheet — 684 formulas, recalculated independently — and the two match to within a dollar across six tested scenarios at the default ten-year horizon. At longer horizons the two diverge by about 1% in a buy-favoring direction, because the calculator implements a more complete version of “invest the difference” (whichever path is cheaper in a given year does the investing) than the spreadsheet does. Where they differ, the calculator is the more honest of the two.

The calculator runs entirely in your browser — nothing is sent anywhere, and the JavaScript that does the arithmetic is right there in the page if you want to read it. If you find a formula you think is wrong, or an assumption you’d challenge, that’s the thing worth flagging. Honest math means being correctable.

This page documents the model as of 2026-05-27. As tax law, default rates, and our understanding evolve, this page will be updated. The version of the math currently in production is whatever the calculator on this site is running — if you spot a discrepancy with what this page describes, that’s the bug to report.