Mortgage vs renting: the real break-even math

Renting has a small, stable cost structure. Monthly rent is the headline — fixed for the lease term, typically 12 months, and subject to increase at renewal or per the market. Renter's insurance runs about $15 to $30 a month for most US markets, protects personal property and liability, and is sometimes required by the landlord. A deposit of one to two months' rent sits with the landlord as security; it is refundable minus damages when you leave. Moving costs kick in when you exit, averaging $1,000 to $4,000 for an intracity move.

That is essentially the entire structure. Notice what is missing: no property tax, no maintenance budget, no insurance on the building itself, no capital tied up, no selling costs. The opportunity cost of your capital is zero because you are not required to put any up. The rent figure is the full out-of-pocket. Budgeting is simple, and you can move without transaction friction.

Owning has a much larger and less visible cost structure. The headline is the mortgage payment (principal + interest), but it is only one line of several.

Property tax. US average is around 1.1% of home value per year, with wide variation by state and county. Texas averages 1.6–1.8%, California around 0.75%, New Jersey above 2.2%. On a $400,000 home at 1.2% — a mid-range number — that is $4,800 per year, or $400 per month.

Homeowner's insurance. $1,500 to $3,000 per year for most US homes, higher in coastal and wildfire-prone areas. Call it $200 per month as a mid-range.

HOA fees. Applicable to condos, townhomes, and planned communities. Range from $100 to $800+ per month depending on the property type and amenities. For a standalone single-family home, this line is zero.

Maintenance. Rule of thumb: 1% to 3% of home value per year, averaged over the long run. Some years are $0, some years are a $15,000 roof. On a $400,000 home at 1.5%, that is $6,000 per year, or $500 per month in expected maintenance reserve. Do not budget below 1%; older homes and coastal climates skew higher.

Closing costs. 2% to 5% of the purchase price, one-time, at the start. On $400,000, that is $8,000 to $20,000 paid at closing. Amortize it over your expected holding period when comparing to rent.

Opportunity cost on the down payment. The cash you put down could have been invested. At a 7% real return (long-run US stock market average), a $80,000 down payment foregoes about $5,600 per year of compounding, or $467 per month. This is the line that gets left out of most informal comparisons and changes the answer most dramatically.

Selling costs. 6% agent commission plus 1–2% in transfer tax, title fees, staging, and pre-sale repairs. Realistically 7–8% of sale price at exit.

Scenario: $400,000 home, 20% down ($80,000), 30-year fixed mortgage at 7% (representative for 2025–2026), 1.2% property tax state, no HOA, 1.5% maintenance reserve.

Mortgage principal and interest: $320,000 financed at 7% over 30 years = $2,129 per month.

Property tax: $400,000 × 1.2% ÷ 12 = $400 per month.

Homeowner's insurance: $2,400 per year ÷ 12 = $200 per month.

Maintenance: $400,000 × 1.5% ÷ 12 = $500 per month in reserve.

Out-of-pocket monthly cost: $2,129 + $400 + $200 + $500 = $3,229.

Opportunity cost on $80,000 down payment at 7% real return: $5,600 per year ÷ 12 = $467 per month.

True all-in monthly cost: $3,229 + $467 = $3,696.

Compare to renting a similar property at $2,400 per month. The monthly gap is $3,696 − $2,400 = $1,296 — the owner pays about $1,296 more per month than the renter, once you include opportunity cost.

The owner is also building wealth while paying that higher monthly cost. Two channels: principal paydown (forced savings via the mortgage payment itself) and home appreciation.

Principal paydown. On a 30-year mortgage at 7%, year-one principal paydown is about $3,260 total, or roughly $270 per month. The amount rises slowly — most of the first decade's payment goes to interest. Call it a $270–$400 per month savings equivalent across the first 5 years.

Appreciation. Historical US average is 3–4% nominal per year, but with huge regional variation and real (inflation-adjusted) appreciation closer to 1% over very long periods. Using 3% nominal on $400,000 = $12,000 per year = $1,000 per month in paper gain.

Rough year-one wealth accumulation: principal paydown ($270/mo) + appreciation ($1,000/mo) = $1,270/mo of wealth created by owning.

Compare to the renter: they save the $1,296 monthly gap and invest it at 7%. Year-one wealth accumulation: approximately $1,296 + growth = about $1,340 by year-end. Close to identical in year 1.

The comparison changes in later years. The owner's principal paydown accelerates as the mortgage amortizes; appreciation continues to grow on a larger base. The renter's investment portfolio also compounds, but the monthly gap narrows if rent rises faster than property costs (which happens in high-appreciation markets). The ownership lead typically builds year over year, but only after the closing and selling costs are earned back.

Selling costs of 7–8% of sale price plus 2–5% in closing costs at purchase mean an owner starts roughly 10% in the hole relative to a renter on transaction costs alone. You need enough appreciation and enough months of principal paydown to climb out of that hole before buying wins on pure financial terms.

At 3% annual nominal appreciation and the monthly numbers above, the typical break-even is 5 to 7 years of tenure. Shorter than 5 years, renting almost always wins financially because the transaction costs have not been earned back. Longer than 10 years, buying almost always wins (by a wide margin in strong markets, by a narrow margin in stagnant ones). The 5–10 year window depends heavily on local appreciation, your mortgage rate, your tax bracket (mortgage interest and SALT deductions for itemizers), and how aggressively you would invest the monthly gap as a renter.

This is why mobility costs compound on the renting side in a positive way: if you expect to move for work in the next 3 years, the math for buying is brutal, and you would have to assume well-above-average appreciation to break even. If you are planning to stay in one place for 10+ years, the math flips and buying becomes the better financial move in most markets.

Renting wins when: your expected tenure is under 5 years; career mobility matters more than stability; the local market has poor appreciation history or very high HOA fees eating the carrying cost; you lack the emergency fund to absorb a surprise $15,000 major repair; rent is significantly cheaper than the all-in ownership cost for a comparable property (price-to-rent ratio above 20).

Buying wins when: you expect to stay 7+ years; income is stable and sufficient to absorb both the monthly and the variance from unexpected repairs; the local market has a reasonable appreciation history (3%+ nominal over multiple decades); the non-financial benefits — school district, renovation control, stability of the same neighborhood — matter to you; price-to-rent ratio is under 15.

The framing that matters is not "renting throws money away." It is: "over my expected tenure, which costs more, including all lines and opportunity cost?" Sometimes the answer is renting, sometimes owning. The decision deserves spreadsheet-level honesty, not a folk saying.

Underestimating maintenance. 1% of home value per year is a floor for newer homes in mild climates. Older homes, coastal exposure, or deferred-maintenance purchases need 2–3% budgeted. "The inspector said the roof was fine" is not a maintenance plan — something expensive will happen in year 3, year 7, year 12, and year 15, and the reserves need to be there.

Counting a paid-off mortgage as "free housing." Even after the mortgage is gone, you still pay property tax, insurance, and maintenance — on the numbers above, that is $1,100 per month on a $400,000 home, or over $13,000 per year. A paid-off house is cheaper than renting, but it is not free.

Comparing monthly rent to monthly P&I only. This is the most common error in casual rent-vs-buy conversations. Mortgage principal and interest is only half the real cost of owning. Add tax, insurance, maintenance, and opportunity cost to get the number that actually compares.

The mortgage calculator on the site returns the full monthly payment including taxes and insurance (PITI) and an amortization schedule — the exact numbers to plug into a rent-vs-buy comparison. Pair it with the loan calculator when comparing different loan structures (15-year vs 30-year, fixed vs adjustable) to see how total interest paid changes with term. For the opportunity cost side of the equation, use the compound interest calculator to project what the down payment would grow to if invested instead.

The math is not hard, but it has to be complete. A break-even calculation with realistic assumptions (1.5% maintenance, full opportunity cost, honest appreciation) is the single most useful number you can produce before making a housing decision. Run it with your specific inputs, twice — once with optimistic assumptions, once with pessimistic — and see how sensitive the answer is.

This article is for educational purposes only and is not financial or legal advice. Real estate decisions depend on local market conditions, personal finances, tax situation, and factors beyond what any general model captures. Consult a licensed financial advisor, tax professional, and local real estate expert before making a major purchase decision.