Why the usual comparison is wrong
The tempting comparison is rent against the mortgage payment. It fails in both directions. It overstates the cost of renting because part of a mortgage payment builds equity, and it understates the cost of owning because the mortgage payment leaves out several other costs.
A fair comparison asks one question: after a given number of years, which path leaves you with more money? That needs a ledger for each side.
The full cost of buying
Add up everything you spend as an owner:
- Down payment and closing costs. Closing costs commonly run a few percent of the price.
- Mortgage interest. The principal part of your payment is not a cost; you get it back as equity. The interest is.
- Property tax and homeowners insurance. These continue after the loan is paid off.
- Maintenance. A common rule of thumb is about 1% of the home's value a year, though it varies with age and condition.
- Selling costs. Agent fees and closing costs on sale often total around 6% of the price.
- Extras: HOA dues and mortgage insurance if you put less than 20% down.
As a reminder of the mortgage piece: a $300,000 loan at 6% over 30 years has a payment of $1,798.65 a month, and after ten years you still owe about $251,057. Only about $49,000 of principal has been repaid in a decade, which is why early ownership builds equity slowly.
The full cost of renting
Renting looks simpler, but it has its own moving parts:
- Rent, which usually rises each year. Using a growth rate of 3% means a $2,000 rent becomes about $2,688 after ten years.
- Renter's insurance and any fees.
- Moving costs each time you relocate.
The part people forget is on the other side of the ledger: what you do with the money you did not spend on a down payment and closing costs. If you invest it, it can earn a return. That earnings potential is the opportunity cost of buying, and it belongs in the comparison. How large it is depends on the return you assume, which is uncertain.
Putting it together: the break-even year
For each year of a stay, tally two numbers:
- Net cost of renting: cumulative rent and insurance, minus the investment growth on the cash you saved.
- Net cost of buying: upfront costs, cumulative payments, tax, insurance and maintenance, minus the cash you would receive on sale (home value, less selling costs, less the loan balance).
The break-even year is the first year in which buying's net cost drops below renting's. Because buying has large upfront and exit costs, it tends to lose in the first few years and may catch up later, if it does at all. That is why time horizon is the most important input. Our rent vs buy calculator builds this ledger year by year and reports the break-even point.
The assumptions that swing the answer
Change one of these and the winner can flip:
- How long you will stay. Under about five years, transaction costs often dominate. The longer the stay, the more time for equity to build.
- Home price growth. Try 0%, 2% and 4%. Prices can stall or fall in some places and periods, so a plan that only works at high appreciation is fragile.
- Mortgage rate. A one-point change shifts the payment by hundreds of dollars a month on a typical loan.
- Price-to-rent ratio. Where homes cost many years of rent, buying has a harder time paying off.
- Return on invested cash. A higher assumed return favors renting; a lower one favors buying.
- Rent growth. Fast-rising rents favor owning, since a fixed-rate payment does not rise.
Run a handful of scenarios: a pessimistic one, a middle one and an optimistic one. If buying wins in all of them, or loses in all of them, the choice is clear. If it flips, you know which assumption is carrying the decision.
What the numbers leave out
Not everything fits in a spreadsheet. Buying can bring stability, the freedom to renovate and protection from rent increases, and a fixed-rate payment may make budgeting easier. Renting offers flexibility to move for work, no responsibility for repairs and less money tied up in one asset. Tax effects, such as deductions for mortgage interest and property tax, only help if you itemize, and many households take the standard deduction. Our calculator leaves out those effects, along with mortgage insurance, HOA fees and moving costs, so add them mentally if they apply to you.
Check that you can afford the monthly cost with your actual take-home pay, and keep a cash reserve for repairs after you buy. If the decision is tied to a new job in another city, the relocation cost comparison and job offer comparison help put the housing choice in context.
This guide explains a method and is not financial advice. It does not predict what will happen to prices, rates or rents.
Frequently asked questions
How long do I need to stay for buying to make sense?
There is no fixed number, but buying and selling costs are large, so many analyses find that staying fewer than about five years favors renting. Your break-even year depends on prices, rates and rents where you live.
Is rent really throwing money away?
Not entirely, and owning is not free either. Rent buys housing, just as interest, taxes, insurance and maintenance buy housing for an owner. Only the principal portion of a mortgage payment builds equity.
How much should I assume for maintenance?
A common rule of thumb is around 1% of the home's value per year, but older homes and harsh climates can cost more. Newer homes may cost less in the early years.
Should I count my down payment as a cost?
Not exactly. It becomes equity that you recover on sale. The cost is the return you could have earned by investing that money instead, plus the closing costs you will not get back.
Does a 20% down payment matter?
On a conventional loan, putting down less than 20% usually means paying mortgage insurance, which adds to monthly cost. It can often be removed once you have enough equity; ask your lender about the rules.