Renting versus buying is one of the biggest financial decisions most people make, and it's also one of the most commonly oversimplified. "Buying builds equity, renting is throwing money away" is a slogan, not an analysis. The right answer depends on local prices relative to rent, how long you plan to stay, current mortgage rates, and what your money would otherwise be doing if it weren't tied up in a down payment. This guide walks through the actual math so you can run the numbers for your own situation instead of relying on a rule of thumb that may not apply to your market.
Start with the price-to-rent ratio
The price-to-rent ratio is a quick way to gauge whether a specific market favors renting or buying. Calculate it by dividing the median home price by the annual rent for a comparable property:
Price-to-rent ratio = Home price ÷ Annual rent
As a general guide:
- Below 15: buying tends to be favorable relative to renting.
- 15 to 21: it's close to a toss-up, and other factors (time horizon, rates, lifestyle) should drive the decision.
- Above 21: renting tends to be the financially stronger choice.
This ratio varies enormously by city and even by neighborhood, so it's worth calculating for the specific area you're looking at rather than relying on national averages. A market with a ratio of 25 can make renting the clearly better financial move even if buying "feels" like the more responsible adult decision.
The 5% rule: a fast monthly comparison
The price-to-rent ratio tells you about a market; the 5% rule translates that into a monthly number you can compare directly against an actual rent listing. Take the home's price, multiply by 5%, and divide by 12:
Monthly breakeven rent = (Home price × 5%) ÷ 12
That 5% figure is a rough stand-in for the annual cost of owning that isn't reflected in a mortgage payment alone: roughly 1% for property taxes, 1% for maintenance, and 3% representing the opportunity cost of having a down payment tied up in a house instead of invested elsewhere. If the rent on a comparable property is below that breakeven number, renting is likely the better financial move for now; if it's above, buying starts to look more attractive. Comparing your own numbers side by side is exactly what Cortex's Rent vs. Buy Calculator is built to do — it takes your specific home price, rent, rate, and time horizon and shows the full comparison rather than a single rule-of-thumb percentage.
How long you'll stay matters more than the mortgage rate
Buying comes with large transaction costs on both ends: roughly 2% to 5% of the purchase price in closing costs when you buy, and another 7% to 10% in agent commissions and transfer costs when you sell. Those costs get amortized over however many years you own the home, which means the breakeven point — the number of years before buying beats renting financially — is highly sensitive to how long you actually stay.
In most markets in 2026, buying needs roughly 5 to 7 years to outperform renting once transaction costs, maintenance, and opportunity cost are factored in. In high-cost markets with elevated price-to-rent ratios, that breakeven horizon can stretch toward a decade. If there's a real chance you'll relocate for a job, a relationship, or any other reason within the next few years, that alone can tip the decision toward renting even in a market where buying otherwise pencils out over the long run.
What a mortgage payment doesn't include
A common mistake is comparing a rent payment directly to a mortgage principal-and-interest payment. The full cost of owning includes several line items rent doesn't have:
- Property taxes, which vary widely by location and are billed on top of the mortgage.
- Homeowners insurance, required by every mortgage lender.
- Private mortgage insurance (PMI), required on conventional loans with less than 20% down, typically costing between roughly 0.2% and 2% of the loan amount per year until enough equity is built up.
- Maintenance and repairs, commonly budgeted at around 1% of the home's value per year, though older homes or major system failures (roof, HVAC, foundation) can exceed that in a given year.
- HOA fees, where applicable, which can run from modest to substantial depending on the building or community.
As of late July 2026, the average 30-year fixed mortgage rate has been hovering in the high-6% range — Freddie Mac's weekly survey put it at 6.58% for the week ending July 23, 2026. Because a 1-point change in rate can shift a monthly payment by hundreds of dollars on a typical loan, it's worth checking the current rate rather than assuming a number from a prior year still applies. Running your specific rate, taxes, insurance, and expected appreciation through the Rent vs. Buy Calculator will give a far more accurate answer than eyeballing the mortgage payment alone.
The opportunity cost of a down payment
Money used for a down payment stops being available to invest elsewhere, and that's a real cost even though it doesn't show up on a settlement statement. A 20% down payment on a $400,000 home is $80,000 that could otherwise be invested. Whether keeping that money invested instead would outperform the combination of home appreciation and avoided rent depends on assumptions about both housing appreciation and investment returns — neither of which is guaranteed in either direction. The Compound Interest Calculator is a useful way to see what that down payment amount could plausibly grow to over your expected time horizon if invested instead, which makes the trade-off more concrete than treating "equity" as an automatic win over "rent."
Building the decision around your own budget
Before comparing rent to a hypothetical mortgage payment, it helps to have an honest picture of what you can actually afford to put toward housing each month without straining the rest of your budget. Lenders often reference a 28/36 guideline — no more than roughly 28% of gross monthly income toward housing costs, and no more than 36% toward total debt payments — but that's a lending ceiling, not necessarily a comfortable target. Running your full monthly numbers through the Household Budget Calculator first gives you a realistic housing budget to plug into the rent-vs-buy comparison, rather than working backward from what a lender says you qualify for.
Frequently asked questions
Is it always better to buy if I can afford the monthly payment?
No. Affording the monthly payment tells you the purchase is possible, not that it's the better financial choice compared to renting and investing the difference. The price-to-rent ratio, your expected time in the home, and current mortgage rates all matter more than whether the payment fits your budget.
How much do I need for a down payment?
There's no fixed requirement — some conventional loans allow as little as 3% to 5% down, and other loan programs allow even less. Putting down less than 20% typically triggers PMI, which adds an ongoing monthly cost until enough equity is built. Putting down more reduces the mortgage balance and can eliminate PMI, but ties up more money that could otherwise be invested or held as a cash reserve.
Does renting really mean "throwing money away"?
Not necessarily. Renting pays for shelter and flexibility the same way a mortgage payment does, and it avoids property taxes, maintenance costs, PMI, and the transaction costs of buying and later selling. If a household invests the difference between renting and what a comparable mortgage payment would have cost, renting can be the financially stronger choice, especially over shorter time horizons.
What's a realistic minimum number of years before buying makes sense?
There's no universal number, but in most markets 5 to 7 years is a reasonable minimum before the transaction costs of buying and selling are likely to be offset by building equity and any appreciation. In expensive markets with high price-to-rent ratios, that horizon can be closer to a decade.
Should I wait for mortgage rates to drop before buying?
Timing rates precisely is difficult even for professional forecasters, and a lower rate later could come with higher home prices if buyer demand increases. Focusing on the price-to-rent ratio, your own time horizon, and what you can afford in your current budget tends to be a more reliable basis for the decision than trying to predict the direction of rates.
Disclaimer
This guide is for general educational purposes only and does not constitute personalized financial, tax, or legal advice. Every reader's situation is different — consult a licensed financial advisor, accountant, or attorney before making decisions based on this content. Figures and rules cited here reflect the most recent information available at time of publication and may change; verify current limits and regulations before acting.