Rent vs Buy Math 2026: The 5% Rule and When Buying Wins

Answer first: compare rent against the unrecoverable costs of owning — roughly 5% of the home's value per year (taxes, maintenance, cost of capital, risk). Rent below that line favors renting; above it favors buying — provided you stay put 5–10 years for transaction costs to amortize.

Worked example: $2,000 rent vs $2,400 PITI

A $400,000 home at 6.5% with 20% down runs ~$2,400/month PITI (about $2,023 P&I plus ~$380 tax and insurance). Comparable rent: $2,000. Buying costs $400/month more out of pocket — but ~$400 of the early mortgage payment is principal (forced savings), roughly a wash on cash flow. The real comparison:

Renting: $2,000 gone, $400/month free to invest, zero repair risk, move anytime.
Buying: $2,400 out, ~$400 becomes equity, ~$2,000 gone to interest/tax/insurance — plus maintenance surprises and 8–10% round-trip transaction costs eventually.

The 5% rule, precisely

Unrecoverable ownership runs ~3% yearly (1% property tax + 1% maintenance + ~1% cost-of-capital premium over renting's flexibility), plus ~2% for risk, illiquidity, and amortized transaction costs. So: annual rent ÷ home price below ~5% → lean rent; above ~5% → lean buy. A $400,000 home renting for $1,667/month sits exactly on the line.

Break-even horizon

Buying $400,000 costs ~$8,000–$20,000 in closing costs day one, and selling later costs ~6% broker plus transfer taxes. Against ~$400/month of early principal buildup, the math needs 5–10 years to turn positive — longer with low down payments (PMI) or high rates. Military, medical residents, and serial movers should default to renting.

Run your own numbers

Price the ownership side with the mortgage calculator (P&I + your local tax/insurance).
Check affordability against real take-home from the paycheck calculator, not gross salary.
Apply the 5% rule and the 5-year horizon test. If both point the same way, decide with confidence.

Conclusion

Rent is the maximum you pay; a mortgage is the minimum. Compare unrecoverable costs honestly with the mortgage and paycheck calculators, and let the math — not the mantra — choose.

Frequently Asked Questions

What is the 5% rule for rent vs buy?

Compare annual rent to 5% of the home price (roughly 3% unrecoverable ownership costs — taxes, maintenance, cost of capital — plus ~2% for risk and transaction friction). If rent is well below 5% of price, renting usually wins; well above, buying usually wins. A $400,000 home sets the line at ~$20,000/year or ~$1,667/month rent.

Is renting throwing money away?

No — rent buys flexibility and the maximum known cost. Owners "throw away" interest, taxes, insurance, and maintenance, which exceed principal paydown for the first decade of most mortgages. The wealth question is what each side does with the difference.

How long until buying breaks even?

Typically 5–10 years, driven by closing costs (~2–5% to buy, ~8–10% all-in to sell later) and early amortization being interest-heavy. Under ~5 years in one place, renting almost always wins mathematically.

What costs do buyers forget?

Closing costs, moving, immediate repairs, furniture, higher utilities, HOA special assessments, and 1% of value per year in maintenance. Budget 2–4% of price for year-one extras beyond the down payment.

How do I compare at my own numbers?

Get PITI from the mortgage calculator and true take-home from the paycheck calculator, then stack PITI + 1% maintenance against rent for the same quality of home. Whichever is lower — invested difference included — usually wins.

Does buying always win long-term?

Not always. In high price-to-rent markets, disciplined renters who invest the monthly savings often match or beat owners over decades. Buying wins reliably when you stay long, buy below means, and fix housing costs while rents rise.