📖 Guide

Rent vs Buy: The Real Math Behind the Decision

Break-even analysis, the 5% rule, opportunity cost of the down payment, and maintenance costs. When buying wins and when renting wins.

The Ownership Illusion: Why Buying Isn't Always Cheaper

A $400,000 home purchased with 20% down ($80,000) at 7% mortgage rate carries a principal-and-interest payment of $2,129 per month. Add property tax (1.2% nationally average = $400/month), homeowner's insurance ($150/month), and maintenance (1% of home value annually = $333/month), and total monthly housing cost reaches $3,012. A comparable rental in the same neighborhood might cost $2,400. The buyer pays $612 more per month, and that gap widens in high-tax, high-price markets.

Home equity does accumulate over time, and home appreciation has historically kept pace with inflation nationally. But the down payment also has an opportunity cost: $80,000 invested in a stock index fund at 7% real return grows to $307,000 over 20 years. That's the alternative your down payment forfeits. Buying builds equity; renting and investing the difference can build comparable wealth without illiquidity.

This guide walks through the full cost comparison framework, explains the 5% rule, calculates the break-even time horizon, and identifies the specific market conditions where buying clearly wins versus where renting and investing makes more financial sense.

The Basics: True Cost of Ownership vs True Cost of Renting

True cost of owning includes more than the mortgage payment:

Mortgage principal and interest (the quoted payment)
Property taxes (US average: 1.1% of home value per year)
Homeowner's insurance (0.5% of home value per year)
Maintenance and repairs (1–2% of home value per year)
HOA fees (where applicable, average $170–$300/month in communities with HOAs)
Mortgage interest cost (the interest portion of your payment builds no equity)
Opportunity cost of down payment (invested elsewhere)
Transaction costs: buying costs 2–5% of home price; selling costs 6–9% (agent commissions, closing costs)

True cost of renting is simpler:

Monthly rent (often includes some utilities)
Renter's insurance ($15–$30/month)
Lost opportunity of not building home equity

The comparison must account for what the renter does with the money saved versus buying. A renter who saves the down payment equivalent and invests it builds wealth differently from one who spends it all.

The 5% Rule: A Fast Rent vs Buy Estimate

Economist Ben Felix popularized the 5% rule as a quick annual cost estimate for home ownership:

Annual unrecoverable cost of owning ≈ Home Value × 5%

Broken down: 3% for opportunity cost of equity (what the down payment and equity could earn), 1% for maintenance, 1% for property tax (varies by location). The 5% represents the annual cost of ownership that doesn't build equity, equivalent to "rent" you pay to yourself as a homeowner.

Example: $500,000 home. Annual unrecoverable cost: $500,000 × 5% = $25,000, or about $2,083/month. If you can rent an equivalent home for less than $2,083/month, renting and investing the difference likely produces comparable or better financial outcomes over a medium time horizon. If comparable rent is $2,800/month, buying wins financially (assuming you stay long enough).

The 5% rule ignores appreciation and is sensitive to the local property tax rate. Use it as a quick filter, not a final answer.

Common Misconceptions

"Rent is throwing money away." Rent pays for housing, like mortgage interest, property taxes, insurance, and maintenance all pay for housing without building equity. In a $400,000 home at 7% for 5 years, the owner builds roughly $37,000 in equity through principal paydown, on mortgage interest payments alone of $130,000 over those 5 years. Both renters and owners "pay to live somewhere."
"Real estate always goes up." US national home prices rose in nominal terms over most decades, but they declined nationally from 2006 to 2011 (Case-Shiller national index fell 27%). Japan's property values fell for 15 consecutive years starting in 1991. Local markets can underperform inflation for a decade or more. Detroit home prices in 2024 remain below their 2005 peak.
"Building equity is always better than investing." Home equity has returned roughly 1% real per year nationally over the past century, about the same as inflation. Stock indices have returned 7% real. A renter who invests the equivalent of a down payment and the monthly cost difference in a stock index fund frequently outperforms the buyer financially over 10–20-year periods in high price-to-rent ratio markets.
"You should buy as soon as possible." Buying before you're financially ready, without a 20% down payment, without 3–6 months emergency fund remaining after purchase, without stable income, creates catastrophic downside risk. The 2008 housing crisis destroyed millions of households that bought at the edge of affordability. Financial readiness matters more than timing the market.
"A 15-year mortgage is always better than 30-year." A 15-year mortgage at 6.5% on $350,000 has a $3,051/month payment. The same balance at 7% for 30 years is $2,329/month. The $722/month difference invested at 7% for 30 years grows to $882,000. The 30-year borrower can finish wealthier than the 15-year borrower if they maintain investment discipline, though most don't.

Worked Example: Carlos Deciding Between Buying and Renting in Austin

A 10-year comparison with real numbers from one market

Carlos can buy a $450,000 home in Austin or rent a comparable home for $2,600/month. He has $90,000 saved (20% down). Mortgage: $360,000 at 7%, 30-year = $2,396/month P&I. Property tax: $5,400/year ($450/month). Insurance: $1,800/year ($150/month). Maintenance: $4,500/year ($375/month). Total ownership cost: $3,371/month.

Monthly cost difference (buying minus renting): $3,371 – $2,600 = $771 more per month to own.

After 10 years of buying: Principal paid down: ~$50,000. Assumed 3% annual appreciation: home worth ~$605,000. Home equity: ~$50,000 (paydown) + $90,000 (original down) + $155,000 (appreciation) = $295,000. Selling costs at 7%: –$42,350. Net equity realized: ~$252,650. Total extra paid vs renting: $771 × 120 = $92,520.

After 10 years of renting: $90,000 down payment invested at 7% = $177,000. $771/month invested at 7% = $134,000. Total invested wealth: $311,000.

In this scenario, renting and investing comes out $58,350 ahead over 10 years. Buying wins after year 13–15, when appreciation and equity accumulation outpace the investment portfolio. Carlos plans to stay 8–10 years, renting wins in this case. If he planned to stay 20+ years, buying would win.

When the Standard Approach Breaks Down

Very low price-to-rent ratios. In markets like Cleveland, Detroit, or Memphis, price-to-rent ratios fall below 10 (meaning a home sells for less than 10 years of equivalent rent). In these markets, buying becomes almost universally better than renting on purely financial terms within 3–5 years.
Homebuyer tax credits and first-time buyer programs. FHA loans allow 3.5% down payments. Some states offer down payment assistance grants of $10,000–$30,000 for first-time buyers. These programs shift the calculus by reducing the down payment opportunity cost and improving affordability. Run the numbers with the specific program terms.
High-appreciation markets during low-rate environments. In San Francisco from 2010–2022, home appreciation averaged 8–10% annually. Buyers who purchased in 2012 at 3.5% mortgage rates generated massive returns that no renter-investor strategy matched. Past appreciation in supply-constrained markets is not guaranteed to continue as rates rise and affordability erodes.
Rent control markets. In cities with strong rent stabilization (New York City, San Francisco, Los Angeles), long-term renters can lock in below-market rents indefinitely. A rent-stabilized apartment at $2,000/month in a market where comparable units cost $3,500/month tips the financial scale firmly toward renting, permanently.
Short stay horizons. Transaction costs to buy and sell a home run 8–12% of the home's value. On a $400,000 home, that's $32,000–$48,000 in friction. A home must appreciate at least that much before a short-term buyer breaks even. Buyers who stay fewer than 3–5 years in most markets lose money after transaction costs even if the home appreciates modestly.

Quick Reference: Rent vs Buy Break-Even by Market Type

Market Type	Price-to-Rent Ratio	Typical Break-Even	Financial Verdict
Affordable markets (Cleveland, Memphis)	8–12x	3–5 years	Buy if staying 4+ years
Mid-tier markets (Atlanta, Dallas)	13–18x	5–8 years	Buy if staying 7+ years
Expensive markets (Seattle, Denver)	18–25x	8–12 years	Rent if staying under 8 years
High-cost markets (NYC, LA, SF)	25–40x	12–20 years	Rent unless staying 15+ years
Ultra-premium (Manhattan co-ops)	40x+	20+ years	Rent almost always wins financially

Frequently Asked Questions

How long do you need to stay in a home for buying to make sense?

In most US markets with 7% mortgage rates, the break-even point falls between 5–8 years after accounting for transaction costs, maintenance, and the opportunity cost of the down payment. In low price-to-rent markets like the Midwest, break-even can come in 3–4 years. In high-cost coastal markets, break-even can take 12–15 years.

What is the price-to-rent ratio?

Price-to-rent ratio divides the home's purchase price by annual rent for a comparable home. A $300,000 home with $1,500/month comparable rent has a ratio of 300,000 / 18,000 = 16.7. Ratios below 15 generally favor buying; ratios above 20 generally favor renting from a pure financial standpoint. The national average in 2024 is approximately 17–18.

What is the 5% rule for renting vs buying?

The 5% rule estimates annual unrecoverable ownership costs at 5% of the home's value (3% opportunity cost, 1% maintenance, 1% property tax). Divide by 12 to get the monthly equivalent. If monthly rent costs less than this figure, renting is financially comparable or better. If monthly rent costs more, buying offers better value, assuming you stay long enough to amortize transaction costs.

Does renting build any wealth?

Renting builds wealth only if the renter invests the savings versus buying. A disciplined renter who invests the down payment equivalent and any monthly cost difference in a diversified stock index fund can accumulate comparable or greater wealth than a homeowner in high price-to-rent ratio markets. Renters who spend rather than invest fall behind buyers over time in all markets.

Is now a good time to buy a house?

Personal circumstances (job stability, planned tenure, family size) matter more than market timing. Historically, buyers who waited for a "better time" to buy in supply-constrained markets often waited indefinitely as prices continued rising. The more important question: can you afford the home at current rates without financial stress, and do you plan to stay at least 5–7 years?

What down payment do I need to buy a house?

Conventional loans require 5–20% down. FHA loans accept 3.5% with a 580+ credit score. VA loans (veterans) and USDA loans (rural areas) require no down payment. Putting down less than 20% on a conventional loan triggers PMI (private mortgage insurance) of 0.5–1.5% annually, adding $150–$375/month on a $300,000 loan. PMI cancels once equity reaches 20%.