Rent Or Buy Calculator

What this calculator does

Comparing rent against a mortgage payment is the most common way people decide between renting and buying, and it is wrong. Part of every mortgage payment builds equity you keep, while the down payment you hand over on day one could otherwise be growing in the market. This calculator does the comparison properly: it simulates both paths year by year, the buyer’s growing home equity against the renter’s growing investment portfolio, and finds the break-even year when buying pulls ahead and stays ahead.

Enter the home price, down payment, mortgage rate and term, your rent, and how long you plan to stay, plus your assumptions for appreciation, rent growth, investment returns, and the real costs of owning (taxes, insurance, maintenance, HOA, closing and selling costs). You get the true monthly cost of owning versus renting, the price-to-rent ratio, both net-worth figures at your horizon, the break-even year, and a verdict.

Worked example

$400,000 home, $80,000 down, 6.5% 30-year mortgage, $2,200 monthly rent, 10-year stay, 3.5% appreciation, 3% rent growth, 7% investment return, 3% closing costs, 8% selling costs, $4,800 property tax, $1,200 insurance, 1% maintenance, no HOA:

1. Loan: 400,000 - 80,000 = $320,000; monthly P&I at 6.5% over 30 years = $2,022.62
2. Total monthly owning cost: 2,022.62 + 400 (tax) + 100 (insurance) + 333.33 (maintenance) = $2,855.95 vs rent $2,200.00
3. Price-to-rent ratio: 400,000 / (2,200 x 12) = 15.2
4. After 10 years: buyer net worth (home value minus mortgage balance minus 8% selling costs) = $247,816.74; renter net worth ($92,000 invested plus monthly savings invested at 7%) = $256,023.70
5. Net advantage: 256,023.70 - 247,816.74 = $8,206.96 to the renter. Because that gap is under $10,000, the calculator calls it too close to call and reports no sustained break-even within 10 years

Notice how the example sits in the judgment zone: the renter finishes about $8,200 ahead, but not decisively. Extend the stay to 20 years with the same assumptions and the story flips: break-even arrives in year 12, and buying wins by $49,277. That is the whole lesson of rent versus buy: the answer is a function of time. Enter these numbers and the calculator reproduces every figure.

Why monthly cost alone lies

The naive comparison says owning costs $2,855.95 a month against $2,200 rent, so renting wins by $656 a month. But roughly $540 of that first mortgage payment is principal, money that becomes your equity, not the bank's. Meanwhile the renter is not stuffing $92,000 of down payment and closing costs under a mattress; invested at 7%, that capital works hard. The honest comparison is net worth at the end: what the buyer walks away with after selling costs versus what the renter's invested capital grew into. Only a year-by-year simulation captures both sides, which is why this calculator runs one instead of comparing two monthly numbers.

How the break-even year is found

Each simulated year, the calculator computes the buyer's net worth (appreciated home value, minus remaining mortgage balance, minus selling costs) and the renter's net worth (the down payment and closing costs invested from day one, plus any monthly savings versus owning, all compounding at the investment return). The break-even year is the first year the buyer pulls ahead and stays ahead through the end of your horizon. The "stays ahead" condition matters: without it, a brief lead that later reverses would be reported as a win. If no such year exists, the calculator says so plainly instead of inventing one.

The price-to-rent ratio shortcut

Before running the full simulation, one ratio gives you the shape of the answer: home price divided by annual rent. Under 15, buying usually wins for anyone staying a few years; 15 to 20 is the judgment zone where assumptions decide; above 20, renting usually wins unless you stay a long time or appreciation runs hot. The worked example's 15.2 sits right at the edge, which is exactly why the 10-year verdict favors renting while the 20-year verdict favors buying. Use the ratio for a quick read, then let the simulation do the real work.

Mortgage-interest deduction: the tax benefit most calculators ignore

The NYT calculator includes the marginal tax rate for a reason: mortgage interest is tax-deductible for itemizers, which effectively discounts the interest portion of every payment. Enter your marginal tax bracket and the model credits the buyer with the tax savings each year (interest paid x bracket), added to the buyer's net worth. At a 24% bracket on a typical loan, this can shift the break-even year earlier by a year or more. Leave it blank to keep the classic no-tax comparison.

Year-by-year table: watch the crossover happen

The verdict tells you who wins, but the year-by-year table shows when and whether the lead ever flips back. Each row compares buyer net worth (home equity after selling costs, plus any tax savings) against renter net worth (invested down payment and monthly savings) for every year of your horizon. A buy lead that appears in year 7 and never flips is a confident answer; a lead that flips in year 12 of a 15-year horizon deserves a second look at your assumptions.

What competitors miss

The NYT rent-vs-buy calculator is the gold standard but sits behind a subscription wall. Free alternatives typically show a single verdict or a monthly cost comparison without the year-by-year path, and almost none model the mortgage-interest tax deduction. This calculator gives you the full year-by-year net worth table, the tax-bracket adjustment, and the break-even year in one free screen.

What this model leaves out

Three honest omissions. Taxes: mortgage interest and property tax can be deductible if you itemize, which helps buying; capital gains on the renter's investments and on a large home-sale gain are taxed, which the model ignores. PMI: with less than 20% down, private mortgage insurance adds real monthly cost until it drops off; this model assumes 20% down or no PMI. Friction: moving costs, the months a house sits vacant between tenants or buyers, and the value of flexibility are real but unmodeled. On the non-financial side, owning buys stability, control over the space, and forced savings; renting buys mobility and freedom from repair bills. When the math is within $10,000 either way, let those decide.

Frequently asked questions

How long before buying a home is cheaper than renting?

Nationally, buyers typically break even after 3 to 7 years, but it varies enormously by market, rate, and how long you stay. In high-cost cities it can take 10 or more years. Run your own numbers with your horizon; the break-even year is the answer, not a rule of thumb.

Is renting just throwing money away?

No. Rent buys housing plus freedom from maintenance, taxes, insurance, and market risk, and the money a renter does not sink into a down payment can be invested. In the worked example, the renter ends 10 years about $8,200 richer. Renting is throwing money away only if the alternative (buying) would have built more wealth, which is exactly what the calculator tests.

What is the 5% rule for rent vs buy?

A shortcut popularized by financial analysts: add up the unrecoverable costs of owning (roughly 1% maintenance, property taxes, and the opportunity cost of capital), and if they exceed 5% of the home's value per year, renting is probably cheaper. It is a useful gut check, but the year-by-year simulation in this calculator is more precise.

Does home appreciation matter more than the mortgage rate?

Both matter, but the horizon usually matters most. A low rate helps buying immediately; strong appreciation helps it compound; but neither overcomes selling a house after two years, when 8 to 10% round-trip transaction costs swamp everything. Time in the home is the dominant variable.

What if I might move sooner than planned?

Run the calculator at the shorter horizon. Under 3 to 5 years, renting usually wins because closing costs going in (2 to 5% per the CFPB) and selling costs going out (6 to 10%) need years of appreciation and principal paydown to overcome. If your plans are uncertain, the renter's flexibility has real option value.

Should the renter really invest the difference?

The model assumes a disciplined renter who invests the down payment and any monthly savings at the assumed return. If you would spend the difference instead, buying's forced savings become more attractive and the verdict shifts toward buying. Be honest with yourself about which renter you are.

This calculator gives an educational estimate based on your assumptions. It is not financial advice. Test optimistic and pessimistic assumptions before making a housing decision.

Does the mortgage interest tax deduction change the answer?

Yes, often by a year or more of break-even. Enter your marginal tax bracket and the model adds the yearly tax savings (interest paid times your bracket) to the buyer's side.

How do I read the year-by-year table?

Each row is one year of your horizon: buyer net worth versus renter net worth, with the leader marked. Look for the first year buying pulls ahead and check whether it stays ahead.