Rent vs Buy: The Math Nobody Walks You Through

Somebody at a party, beer in hand, says the sentence every renter eventually hears: “Renting is throwing money away.” Heads nod. The person saying it usually bought a place recently.

The line survives because it contains a sliver of truth — rent buys no equity. But it quietly swaps one number for another. A mortgage payment is not the cost of owning a home; it is the opening bid. The rest of the math never gets said out loud, so let’s say it.

What the Payment Actually Covers

Take a $400,000 house with 20% down and a 6.5% rate on a 30-year loan. The loan is $320,000 and the principal-and-interest payment comes to about $2,023 a month — the mortgage calculator will reproduce that to the cent. Set it against $2,200 rent in the same neighborhood and buying already looks cheaper. That is the trap.

Because $2,023 is the payment, not the cost. A house bills you every month whether anything breaks or not, and these are the bills the party line skips. Here is the uncomfortable part: they add up faster than the mortgage.

• Property tax. Commonly 1% to 2% of the home’s value per year depending on the state. At 1%, this house owes $333 a month in taxes alone.
• Homeowners insurance. Budget around $1,800 a year, about $150 a month, and premiums have been climbing across much of the country.
• Maintenance. The old 1%-a-year rule puts it at $4,000 annually — $333 a month, averaged over quiet years and roof years.
• HOA dues, where they exist, which run anywhere from $50 to $400 a month and rarely move down.
• PMI, which applies until you hold 20% equity. A full 20% down dodges it here; smaller down payments do not.

Stack the first three and the true monthly cost of this house is about $2,840 — roughly $640 more than the rent next door in year one, before a single shingle curls. Of the $24,300 paid to the bank that first year, only about $3,600 touches the principal. The rest is interest — rent, just paid to a lender instead.

The Money You Never Put In

The down payment had a job. Hand the bank $80,000 and it stops earning anything, while 4% in a high-yield savings account would have paid about $3,200 a year — more than $17,000 across five years once it compounds. Nobody invoices you for that. It shows up as money you quietly did not make, and it belongs in any honest comparison.

The Cost of Leaving

Houses charge twice on the way out. The model behind our rent vs buy calculator charges 6% of the sale price when you sell — about $27,800 on a house worth $463,700 after five years. Buy-side closing costs take another 2% to 3% up front. Together, a round trip runs roughly 8% to 10% of the price: $32,000 to $40,000 on this house, whether you stay three years or thirty. Short stays spread those costs over fewer years of ownership, which is how a “great deal” on a starter home stops being one.

What the Numbers Say

Run this example as-is and buying pulls ahead somewhere around month seventeen — about a year and a half in, when the tool’s net cost of owning slips under the roughly $37,400 of rent you would have paid. Renting clearly wins year one. The tool says so itself in the fine print under the results: its model excludes property taxes, maintenance, insurance, and returns on the money tied up in the down payment.

Add those back at the amounts above — about $816 a month in tax, insurance, and upkeep, another $267 a month of forgone interest, plus $10,000 of buy-side closing — and the finish line moves. Buying no longer catches up until right around the five-year mark. Two years in, the simple model shows owning ahead by about $11,000; the fuller math shows it behind by about $25,000. Same inputs, different honesty.

The appreciation assumption deserves the same suspicion. Three percent growth on a $400,000 house adds about $12,000 in the first year, and every percentage point is worth roughly $4,000 a year. Cut appreciation from 3% to zero and the five-year net cost of owning jumps from about $65,000 to about $125,000 — a $60,000 swing on a single input. Rent increases cut the other way: faster-rising rents flatter owning just as much, so both sliders deserve a hard look.

When Renting Wins

None of this makes renting noble. It makes renting priced. What $2,200 a month actually buys is the thing owners consume but rarely count: the option to leave. A lease ends in twelve months; a house does not, and it cannot be sold without paying for the privilege.

Renting is usually the better call when the stay is short, when a job might relocate you, when the real $2,840 would strain the budget, or when a down payment would empty the account and leave nothing for the water heater. The home affordability calculator settles that last question fast — a payment you can technically make and a payment you can live with are different numbers.

None of this means buying is a mistake, either. Past the five-year line, ownership starts to compound in your favor, and rising rents only pull that line closer. The point is knowing which side of the line you will actually live on.

This is general education, not personalized financial advice — your taxes, your market, and your timeline are your own. But the next time the party line surfaces, ask what the roof costs, what the taxes cost, and what $80,000 would have earned. Then run your own numbers through the rent vs buy calculator and let the calendar make the call instead of the cliché.