Americans are told that rent is “throwing money away.” Interest, tax, insurance, maintenance, and a 6–10% sale (agent commissions plus closing) are also money leaving. Equity is real, but it is not free, and it is illiquid until you sell or refinance.
A useful comparison asks: if I stay N years, then sell, what did each path cost after the house is gone? Buying looks better when you stay long enough for appreciation and principal paydown to beat selling costs. Renting looks better when you may move in two years, or when the local price-to-rent ratio is stretched.
Do not forget the down payment’s other job
Cash that becomes a down payment cannot sit in an index fund. A fair model gives that cash a modest investment return on the renting side. If you ignore that, buying always looks cheaper than it is. The return you pick is a judgment call: a long-run stock assumption makes renting look stronger; a cash-like assumption makes buying look stronger. Use something you could actually hold, not a heroic 12%.
Closing costs on the way in are another silent down payment. They do not become equity dollar-for-dollar. If you need to move in year two, you are often selling at a loss after commissions even if the Zillow estimate ticked up.
Maintenance is not optional
A common planning placeholder is about 1% of home value per year for repairs and replacements. Roofs and HVAC do not care that your rate is 6.5%. Renters pay this inside the rent; owners meet it as surprise invoices. New construction can be kinder for a few years and then expensive when warranties end. Condos trade some of that risk for HOA dues — which still count as housing cost, even when they are not in the mortgage draft.
Property tax and insurance belong in the buy column every month, not only at closing. That is the same PITI lesson as the mortgage guide. A rent vs buy tool that uses principal and interest alone is arguing with a fictional landlord.
Appreciation is not a paycheck
House prices can fall. A constant 3% appreciation slider is a scenario, not a forecast. Coastal cities and small metros do not share a national average. If buying only “wins” at 5% annual gains and 30 years, you do not have a robust plan — you have a hope. Stress the slider down. If renting still loses only because you assumed huge gains, stay skeptical.
Rent is not frozen either. A 3% annual rent bump is a planning default, not your lease. Some markets reprice faster. Owners are not immune: escrow can jump when assessments catch up. Both paths have inflation. The question is which inflation you can live with.
Non-money reasons still belong in a money tool
Control over pets, paint, and school districts is real. So is the flexibility to leave a job in another state without selling. A calculator will not score those. It can only stop you from claiming that a three-year stay “builds wealth” when selling costs eat the equity. Use the number to veto a bad financial story. Use the rest of your life to pick among the remaining stories.
Refinancing later is not in the first comparison
Buyers sometimes assume they will refinance in two years to a lower payment. That may happen. It may not. A rent vs buy model that needs a future refinance to “win” is a bet on the bond market. Run the comparison at today’s rate. If you still want to buy, you can, but you are not entitled to a 2021 mortgage in 2026 clothing. HELOCs and cash-out refis are also not free money; they re-leverage the house.
A worked example
Open the rent vs buy calculator with a $425,000 price, 20% down, a realistic PITI, $2,000 rent, 3% appreciation, 3% rent growth, 8% selling costs, and a modest return on the down payment if you rented instead. Move the stay slider from 3 to 7 to 10 years. The winner often flips. That flip is the insight — not a slogan about the American Dream.
Then raise maintenance. Then cut appreciation to 1%. If buying still wins easily, you probably have cheap price-to-rent or a long stay. If it only wins in the optimistic cells, renting is the conservative financial choice even if you still buy for other reasons.
What the calculator will not do
- Mortgage-interest tax deductions (only valuable if you itemize, which many households no longer do after the large standard deduction).
- The value of forced savings if you would not invest the difference while renting.
- Landlord risk if you later rent the place out.
Sources and limits
Selling costs vary by market and brokerage model; 6% plus closing is a planning band, not a law. Opportunity-cost returns are assumptions. Compare with your lease, Loan Estimate, and a local tax bill. Not a recommendation to buy or rent.