Housing
Should You Rent or Buy? Do the Math, Not the Vibes
Rent or buy is the most vibes-driven decision in personal finance. One camp says rent is throwing money away; the other says a house is a money pit with a lawn. Both are slogans, and neither survives contact with a spreadsheet. The honest answer depends on your numbers and — more than anything else — how long you'll stay. Our rent vs. buy calculator models exactly this comparison and shows you the crossover year for your inputs. This article explains what that model is doing and why the folk wisdom on both sides gets it wrong.
Why "rent is throwing money away" is bad math
Rent buys you something concrete: a place to live, with no property taxes, no repair bills, and no capital at risk. Meanwhile the buyer "throws away" plenty too — mortgage interest, property taxes, insurance, and maintenance all leave and never come back. Only the principal portion of a mortgage payment builds equity, and in the early years of a loan it's the minority of the payment.
The bigger error is ignoring opportunity cost. A buyer parks a down payment in the house; a renter can invest that same money. A fair comparison has to credit the renter with those investment returns — and credit whichever side is cheaper each month with investing the difference. That's exactly how the calculator works: symmetric, both sides investing their surplus, no thumb on the scale.
Transaction costs and the five-year rule
Buying a home costs roughly 2–5% of the price in closing costs on the way in, and selling costs around 6% or more — agent commissions plus fees — on the way out. Those are paid once, but they're enormous, and equity needs years to outrun them. That's the entire basis of the old rule of thumb that you shouldn't buy unless you'll stay about five years. It's not superstition; it's amortizing five figures of fixed costs over the length of your stay. Three years of ownership can mean paying more per year in transaction costs than in maintenance.
What buying really costs
The mortgage payment is the headline, not the bill. On top of principal and interest come property taxes (commonly around 1% of the home's value per year, varying a lot by state), homeowners insurance, maintenance and repairs (a reasonable planning figure is 1% of the home's value annually — some years zero, some years a roof), and possibly an HOA fee that behaves suspiciously like rent on the house you own. None of these build equity. All of them are invisible in the "my mortgage is cheaper than my rent" comparison, which is why that comparison keeps producing surprised homeowners.
A worked example
Take the calculator's default scenario: a $400,000 home, 20% down, 6.5% on a 30-year loan, 3% appreciation, versus $2,200 rent rising 3% a year, with the renter's spare cash earning 6% — over a 7-year stay. Buying nets out to a total cost of about $169,000; renting, about $143,000. Renting comes out roughly $26,000 ahead — even though the buyer walks away with about $203,000 in equity.
That's not a contradiction; it's the transaction costs and opportunity cost doing their work. The buyer paid about $12,000 in closing costs going in and roughly $34,000 selling going out, while the renter's $92,000 (down payment plus closing costs, invested instead) quietly compounded the whole time. Equity isn't profit — it's what's left after all of that. On these same assumptions, the lines don't cross until around year 13: stay that long and buying pulls ahead for good.
The crossover year
Every rent-vs-buy scenario has one: the year when buying's accumulated cost drops below renting's and stays there. Before it, the renter is winning; after it, the buyer wins by a growing margin, because a fixed-rate mortgage payment never rises while rent compounds every year. The crossover year is the single most useful number in this whole decision, because it converts the fuzzy question "should I buy?" into a concrete one: "will I stay past year X?" The calculator charts it for your inputs.
When each side tends to win
Renting wins on short horizons (transaction costs dominate), in markets where prices are high relative to rents (the rent money buys a lot of housing; the same mortgage doesn't), and when your income or location is unstable — a mortgage is a terrible thing to owe while job hunting in another city.
Buying wins on long horizons, with a stable job in a place you're sure about, because a fixed payment is a genuine hedge against inflation: rent rises forever, but a fixed principal-and-interest payment is the same in year 25 as in year one, in ever-cheaper dollars. Long-tenure homeowners are effectively paying 2010s prices for 2030s housing. Housing research from the Urban Institute and rate data from Freddie Mac's weekly mortgage survey are good places to sanity-check your market assumptions against something other than a listing agent.
The non-financial reasons are real too
The spreadsheet doesn't capture everything, in both directions. Owning buys stability — nobody can decline to renew your lease, you can paint whatever you want, your kids stay in the school district. Renting buys freedom — the ability to leave a bad job, a bad city, or a bad neighbor with sixty days' notice, and the fact that a failed water heater is a phone call instead of a $1,800 problem. These are legitimate inputs. Just price the financial side honestly first, so you know what the intangibles are costing you — "I'm paying $26,000 for stability" is a decision; not knowing the number is a vibe.
Run the numbers, find your crossover year, then let the soft reasons break the tie. Most people do it in the opposite order.
Common questions
Isn't paying rent just building my landlord's equity?
Partly — but paying mortgage interest builds your bank's revenue, and neither fact settles anything. What matters is total cost against total cost, with the renter's invested down payment counted. Sometimes the landlord math still favors you.
Should I wait for rates to drop before buying?
Rate predictions are guesses, including the confident ones — and waiting has its own price if home prices or rents rise while you sit out. If you buy and rates later fall, refinancing exists; our refinance calculator shows when it pays. Buy when the math and your life line up, not when the forecast does.
What about house hacking or roommates?
Renting out rooms or a unit genuinely changes the math — every dollar of rent you collect offsets ownership costs, and it can drag the crossover year sharply earlier. Model it by reducing the effective monthly cost of buying, and be realistic about vacancies and the fact that you now have a tenant in your house.
Does the calculator include PMI?
No — and it says so right on the page. With less than 20% down, real buyers pay PMI on top of the modeled costs, so under-20%-down results flatter buying slightly. We'd rather tell you that than pretend the model is complete. (What PMI is and how to escape it is its own article.)
Ten minutes with the rent vs. buy calculator beats a decade of repeating slogans. Put in your city's actual numbers and find your crossover year.
This article is general information, not personalized financial advice. How we write and review articles is covered in the editorial note on our About page.