Understanding rent vs. buy
Renting and buying aren't really two different ways to pay for the same thing — they're two different financial strategies. Renting keeps your cash liquid and invested; buying converts it into home equity and locks in a housing payment that (mortgage rate aside) mostly stays fixed while rent keeps climbing. Neither is automatically better. The honest answer depends on how long you'll stay, what mortgage rate you can get, and — the part most calculators downplay — what you could otherwise earn by investing the money a home purchase ties up.
How this calculator works
This runs a month-by-month simulation of two parallel financial paths over your chosen horizon, then compares net worth at the end of each year.
Buying path: a standard amortizing mortgage payment (M = P × [r(1+r)^n] ÷ [(1+r)^n − 1]) plus property tax, insurance, maintenance, HOA, and PMI (while equity is under 20%) — all recalculated each year as the home value appreciates. At the end of the horizon, the home is "sold": home value minus remaining loan balance minus selling costs becomes the buyer's net worth.
Renting path: the down payment and closing costs you didn't spend go into an investment account at your chosen return rate. Every month after that, whichever side (renting or owning) costs less that month, the difference is invested (or, if owning is momentarily cheaper, withdrawn) — so the renter's account keeps compounding the gap between the two paths for the entire horizon.
Break-even year is simply the first year the buyer's net worth overtakes the renter's. Before that year, renting has left you wealthier on paper; after it, buying has.
What each input means
- Down payment: below 20%, lenders typically require PMI (private mortgage insurance) until you cross that equity threshold — this calculator applies and removes it automatically.
- Investment return if you rent: the single most important assumption here. A saver in CDs/bonds might reasonably use 3-4%; a long-run diversified stock portfolio has historically averaged closer to 7%. Try both — the answer can flip entirely.
- Property tax, insurance, maintenance: all scale with the home's current (appreciating) value each year, not just the original purchase price, since a more valuable home typically costs more to insure and maintain.
- Closing costs: a one-time cost when you buy (loan fees, title, inspection, etc.), typically 2-5% of the purchase price.
- Selling costs: a one-time cost when you sell at the end of your horizon (agent commissions, etc.), typically 6-8% of the sale price — this is why a short stay rarely favors buying.
Renting vs. buying: the real trade-offs
On paper, buying wins when you stay long enough for equity and appreciation to outrun transaction costs and the renter's invested savings. But "on paper" is doing some work in that sentence: buying also means less flexibility to relocate for a job, exposure to a single asset (your home) instead of a diversified portfolio, and real, non-optional costs (a leaking roof doesn't wait for a good time in your budget). Renting trades those risks for a landlord who can raise the rent or decline to renew your lease. Financially, this calculator can tell you which path wins by the numbers — it can't tell you which set of risks you'd rather carry.
What this calculator doesn't cover
It doesn't model the mortgage interest tax deduction (most homeowners now take the standard deduction instead of itemizing, so for many people it's worth $0 in practice), state-specific transfer taxes, rent control rules that may cap annual increases in some cities, or the possibility of refinancing to a lower rate mid-horizon. It also assumes appreciation and rent growth are smooth and constant, when real markets move in uneven, sometimes multi-year swings. Treat every output here as a planning estimate built on your assumptions, not a guarantee of what will actually happen in your market.
How long should you plan to stay?
This is usually the single biggest factor in the whole decision, bigger than the mortgage rate. Buying's closing and selling costs are largely fixed regardless of how long you stay, so a short stay forces those costs onto very little time to recover them — which is why renting usually wins under a 3-4 year horizon almost regardless of the other numbers. Past the break-even year this calculator shows you, every additional year you stay tends to widen buying's advantage, since the fixed mortgage payment increasingly looks cheap next to ever-rising rent.
A worked example
Take a $400,000 home with 20% down at a 6.5% mortgage rate, compared against $2,200/month rent, with a conservative 4% assumed investment return. The monthly mortgage payment (principal + interest) comes to about $2,023. Running the full year-by-year comparison, buying's net worth overtakes renting's around year 10-12 — before that, the renter is ahead on paper because the down payment and closing costs have been compounding in an investment account instead. Push the assumed investment return up to 6-7% with everything else unchanged, and renting can stay ahead for the entire 30-year horizon instead. Try both assumptions in the calculator above to see how much that one input matters for your own numbers.
Frequently asked questions
Why does the answer change so much with how long I plan to stay?
Buying carries large upfront costs (closing costs) and back-end costs (selling costs) that only get spread out the longer you hold the home. Renting for 2 years rarely loses to buying financially since those transaction costs barely have time to be absorbed — but stretch the same numbers to 10 or 15 years and home equity plus appreciation usually overtakes what a renter could have invested instead. That crossover point is exactly what this calculator's break-even year shows you.
What does the investment return rate actually control?
It's the single biggest lever in this whole comparison, and many calculators bury it. If you rent, the down payment and closing costs you didn't spend can be invested instead — this rate is what that money is assumed to earn. At a conservative 4% return, buying a typical home often breaks even around year 10-12. Push the assumption to 6-7% (closer to the long-run stock market average) and renting can win for 30 years straight, because money not tied up in a house compounds faster than the house appreciates. Try moving this one number before trusting any answer.
Does this account for the mortgage interest tax deduction?
No, deliberately. Since the standard deduction roughly doubled in 2018, most homeowners no longer itemize, so the mortgage interest deduction is worth $0 to them in practice. Modeling it accurately would require knowing your specific itemization status, filing status, and total deductions — variables this calculator doesn't collect. If you know you itemize, treat this calculator's buying-side cost as a slight overestimate.
What is the 5% rule for rent vs. buy?
A quick mental-math shortcut: multiply the home's price by 5%, then divide by 12. That's roughly the monthly rent at which renting and buying cost the same, before accounting for appreciation or investment returns. The 5% breaks down into about 1% property tax, 1% maintenance, and 3% opportunity cost of the capital tied up in the home. If your actual rent is well below that number, renting is very likely cheaper in the short run — but it skips the same equity and appreciation effects this full calculator includes.
How much cash do I actually need upfront to buy?
Your down payment plus closing costs, shown together in this calculator's results as "Cash needed to buy." This matters separately from the break-even year — a scenario can show buying winning financially over 10 years and still be the wrong move right now if that upfront cash isn't actually sitting available and liquid.
Why did my results change when I only adjusted one input?
Every input here compounds over the full time horizon, not just in the year you're looking at. A 1-point change in mortgage rate changes the monthly payment, which changes how much extra cash the renter would have to invest each month, which compounds at your investment return rate for the rest of the horizon. Small early differences become large ones by year 20-30 — that's why it's worth testing a few realistic ranges for your rate and return assumptions rather than a single guess.
Is renting ever the better financial choice even over a long horizon?
Yes — this isn't a foregone conclusion the way conventional wisdom sometimes assumes. In markets with a high home-price-to-rent ratio, or if you assume a healthy long-run investment return (6-7%+), renting and investing the difference can beat buying for the entire 30-year horizon. This calculator runs the actual year-by-year numbers instead of assuming buying always wins eventually.
This calculator provides estimates for general informational purposes only and is not financial, tax, or legal advice. Real appreciation, rent growth, mortgage rates, and investment returns are never guaranteed — consult a financial advisor or real estate professional before making a buy-or-rent decision.