The national median home sale price hit $427,000 in early 2026, and the average 30-year fixed mortgage rate has been sitting around 6.66% all month. Put those two numbers together with real property tax, insurance, and maintenance costs, and owning the median-priced home right now runs about $3,180 a month. The national median rent is $1,388 a month. That gap, more than $1,700 a month, is the actual starting point for this decision, not a vague "rent is throwing money away" talking point. Here's the full math, and where it breaks down when buying actually makes sense anyway.
The Real Monthly Cost, Worked Out in Full
Start with a $427,000 home, the median existing-home sale price as of Q1 2026 according to the National Association of Realtors, up 3.1% year over year. Put 20% down, $85,400, and finance the remaining $341,600 at 6.66%, the Freddie Mac 30-year fixed average for the week of August 27, 2026. That gives you a 30-year principal and interest payment of about $2,195 a month.
That's not the full cost of owning. Add in the pieces that a mortgage payment alone leaves out:
- Property tax: about $391/month, using the U.S. Census Bureau's national average effective rate of 1.1% of home value.
- Homeowners insurance: about $239/month, based on the industry-standard national average of roughly $2,872/year for a policy with $300,000 in dwelling coverage.
- Maintenance: about $356/month, using the widely cited rule of thumb of 1% of home value per year for upkeep and repairs.
Total: roughly $3,181 a month to own the median-priced home. Compare that to the national median rent of $1,388 a month as of July 2026, according to Apartment List's national rent report, and owning costs more than double what renting does on a pure monthly cash basis. That's a real gap of about $1,793 a month, or $21,516 a year, before either side puts a dollar toward anything else.
One honest caveat: national median rent figures skew toward apartments and smaller units, while a national median home sale price skews toward full single-family houses. You're not always comparing the exact same square footage. Run this same math with your own local rent and home price numbers before you treat the national gap as your personal one.
What Part of That Mortgage Payment Is Actually Yours
Not all of that $2,195 monthly mortgage payment is a pure cost. Part of it pays down principal, which is money that stays yours as home equity. In year one of this loan, roughly $3,700 of the roughly $26,300 you'd pay in principal and interest actually builds equity. The other roughly $22,600 is interest, and interest is a real cost with nothing to show for it later, exactly like rent. Add the property tax, insurance, and maintenance on top of that interest, and the true "cost with nothing to show for it" side of owning in year one is around $34,500, still well above the $16,656 a renter pays for the year.
That equity share grows every year as more of the payment shifts from interest to principal, which is the real financial case for staying in a home long enough for the math to turn in your favor. It just doesn't turn in year one, or usually in year two or three either.
The Down Payment's Opportunity Cost
The $85,400 down payment isn't free money either. It's cash that could otherwise be invested. At a 7% average annual return, roughly the long-run historical average for a diversified stock portfolio, that same $85,400 grows to about $167,995 after 10 years if it's invested instead of tied up in a down payment.
This doesn't mean buying is a bad financial move. Home equity can also appreciate, and a mortgage payment is a forced, automatic form of saving that a lot of people are honest enough to admit they wouldn't do voluntarily with a brokerage account. But treating a down payment as "free" because it's not a monthly expense skips a real cost. Money parked in home equity isn't compounding in the market, and it isn't easy to access without selling or borrowing against the house.
Why the 5-Year Rule Still Holds Up
Buying and then selling a home isn't free. Real estate agent commissions currently average around 5.7% of the sale price nationally, and buyer-side closing costs typically run another 2% to 5% on top of that. Round trip, that's commonly $35,000 to $40,000 in transaction costs alone on a median-priced home, money that has to be recovered through price appreciation and monthly savings versus renting before buying comes out ahead financially.
That's the real logic behind the common advice that you shouldn't buy unless you plan to stay put for at least five years. It's not a superstition. It's the rough amount of time it typically takes for the equity build-up and any price appreciation to outpace what a comparable renter would have kept by not paying those transaction costs and not paying the current ownership premium every month.
Where Buying Actually Wins
- Your monthly housing cost gets fixed. A 30-year fixed mortgage payment doesn't change. Rent does, typically every year at renewal, and rent growth compounds over a decade the way a mortgage payment never does.
- You're building equity in an asset you control, not paying down someone else's mortgage. Even the slow year-one equity build in the math above accelerates every year you stay.
- You're not exposed to a landlord's decisions to sell, not renew your lease, or raise rent to market rate. Renting carries its own version of instability that a pure cost comparison doesn't capture.
None of that changes the math above. It just means the decision isn't purely financial, and it shouldn't be treated as one.
What to Actually Do With This
- Rebuild this exact calculation with your own numbers. Your local home price, your local rent, your actual down payment, and the actual mortgage rate you'd qualify for will all move this math, sometimes by a lot.
- Be honest about your time horizon. Under about five years in one place, renting usually wins financially once transaction costs are counted. Longer than that, and the equity build-up has more time to catch up.
- Watch for FOMO driving the decision. A hot local market where everyone's talking about how fast prices are rising is exactly the environment where people skip this math entirely. Our breakdown of what FOMO actually costs investors applies just as much to a house as it does to a stock.
- If you're renting, don't let the down payment money just sit in cash. If home ownership isn't the right move for you right now, the money you'd have put toward a down payment can still work for you. Our plain-English guide to index fund investing covers the simplest way to do that.
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Spicy Investing