Rent vs Buy Calculator — True Cost Comparison
Compare the true total cost of renting vs buying over any time horizon. Includes opportunity cost of the down payment, equity buildup, home appreciation, rent inflation, and break-even year.
Quick Scenarios
Home Purchase Details
≈ $80,000
Renting & Comparison
Return if down payment invested instead
What Is the Rent vs Buy Calculator — True Cost Comparison?
The rent vs buy decision is not simply about monthly payment size. It requires comparing the total cost of ownership against the total cost of renting over your intended time horizon, including the hidden cost of tying up capital in a down payment.
- ›Opportunity cost — The down payment could be invested. This calculator shows exactly how much that capital would grow if deployed in the market instead of into home equity.
- ›Break-even year — The year when net buy cost drops below net rent cost. Most studies show 5–7 years is the typical break-even horizon in average US markets.
- ›True buy cost — Monthly mortgage is only part of ownership. Property taxes, insurance, HOA, and maintenance (historically 1–2%/yr of value) add substantially to total cost.
- ›Rent inflation — Rent increases compound over time. A $2,000/month rent growing 3% annually becomes $2,688/month in 10 years — ownership provides a fixed principal payment that doesn't inflate.
Formula
True Cost to Buy (Year N)
Net Buy Cost = Σ(Annual Buy Costs) − Equity Accumulated
True Cost to Rent (Year N)
Net Rent Cost = Σ(Monthly Rent × Inflation Factor)
Opportunity Cost of Down Payment
OC = Down Payment × (1 + r)ⁿ − Down Payment
Home Equity
Equity = Home Value(1 + appreciation)ⁿ − Remaining Loan Balance
| Variable | Description |
|---|---|
| Annual Buy Costs | Mortgage P&I + property tax + insurance + HOA + maintenance |
| Equity | Market value of home minus remaining loan balance |
| Opportunity Cost | What the down payment would have grown to if invested in the market |
| Rent Inflation | Annual percentage increase in rent — national average ≈ 3–4%/yr |
| Home Appreciation | Long-run US average ≈ 3–4%/yr; varies significantly by market |
How to Use
- 1Enter home price: Use the purchase price you're considering, not the asking price. Adjust for negotiation.
- 2Set down payment: Enter the percentage. 20% avoids PMI; lower down payments are common but increase cost.
- 3Enter current rent: Your current or expected monthly rent for a comparable property.
- 4Set holding period: How many years you plan to stay. This is the most important variable in the analysis.
- 5Adjust property costs: Enter your local property tax rate, insurance cost, HOA, and assumed maintenance rate.
- 6Set opportunity cost: The return you'd earn investing the down payment. 7% reflects long-run S&P 500 inflation-adjusted returns.
- 7Toggle mortgage interest deduction: If you itemize deductions, check this box to account for the tax benefit of mortgage interest.
- 8Review the break-even year: If you plan to move before the break-even year, renting is likely cheaper.
Example Calculation
$400,000 home, 20% down, 7% mortgage, vs $2,000/month rent — 7 years
Buy scenario:
Down payment: $80,000 (20%)
Loan: $320,000 at 7%, 30-yr
Monthly P&I: $2,129
Property tax (1.1%):$367/mo
Insurance: $150/mo
Maintenance (1%): $333/mo
Total monthly: $2,979
7-yr buy total: $250,236
Equity built: ~$82,000 (prin + appreciation)
Net buy cost: ~$168,000
Rent scenario:
Starting rent: $2,000 growing 3%/yr
7-yr rent total: ~$162,500
Down payment grows: $80k → $128k (invested at 7%)
How to read the result
Over 7 years, net buy cost ($168k) and total rent ($162k) are nearly equal. This is exactly the break-even zone. Staying longer than 7 years tips the math toward buying; moving sooner favors renting. This is why "time horizon" is the most important input in any rent vs buy analysis.
Understanding Rent vs Buy — True Cost Comparison
The Hidden Costs of Homeownership
First-time buyers often compare their future mortgage payment directly to their current rent and conclude buying is cheaper. This comparison misses property taxes (typically 1–1.5% of value annually), home insurance, HOA fees, and maintenance. A well-maintained home costs roughly 1% of its value per year in upkeep — on a $400,000 home that's $4,000/year or $333/month that never appears in a mortgage payment.
Why the Down Payment Has a Real Cost
A $80,000 down payment deployed into a broad market index fund earning 7% annually would grow to approximately $130,000 in 7 years. That $50,000 gain is the opportunity cost — the return you sacrificed to put that capital into home equity. Home equity is not "free money"; it has a cost equal to what that capital would have earned in its best alternative use.
When Buying Almost Always Wins
- ›You stay in the home for 10+ years — transaction costs amortize, equity compounds, and rent inflation works against renters.
- ›You live in a below-average-appreciation market but also below-average-rent market — ownership is more competitive.
- ›You plan to rent out the property or have additional income from the asset.
- ›Your local price-to-rent ratio is below 15 — historically the threshold where buying becomes clearly advantageous.
When Renting Often Makes More Sense
- ›You plan to move within 3–5 years — transaction costs (realtor commissions, closing costs) typically eat 8–10% of home value.
- ›Your local price-to-rent ratio exceeds 20 — common in high-cost cities like San Francisco, New York, or Boston.
- ›You have high-rate debt that should be eliminated before deploying capital into an illiquid asset.
- ›Your career or life situation is uncertain — homeownership reduces mobility at a critical time.
The Price-to-Rent Ratio
Divide the home price by the annual rent for a comparable property. Below 15 generally favors buying; 15–20 is neutral; above 20 typically favors renting. Example: a $400,000 home comparable to a $2,400/month rental has a P/R ratio of 400,000 ÷ (2,400 × 12) = 13.9 — tilting toward buying if you plan to stay long-term.
Frequently Asked Questions
How many years should I plan to stay before buying makes sense?
Most financial analyses put the break-even at 5–7 years for average US markets at current interest rates. The exact number depends on your local market.
- ›Under 3 years: renting almost always wins — transaction costs alone (8–10% of home value) are not recovered.
- ›3–7 years: outcome depends on your specific price-to-rent ratio, return on down payment, and local appreciation.
- ›7+ years: buying generally wins as equity compounds and rent inflation makes renting increasingly expensive.
- ›10+ years: buying is strongly advantaged in most markets at most interest rate environments.
The break-even year is the single most important output to check before deciding.
What is the opportunity cost of a down payment?
The opportunity cost is the investment return you forgo by locking capital into a down payment instead of the market. It is a real cost that most buy-vs-rent comparisons ignore.
- ›An $80,000 down payment at 7% market returns grows to ~$130,000 in 7 years.
- ›The $50,000 foregone gain is the opportunity cost — it represents what the capital would have earned.
- ›Home equity is not "free" — it has a cost equal to its best alternative use.
- ›This calculator shows the net buy cost after accounting for equity built, offsetting the opportunity cost.
This doesn't mean buying is wrong — but the comparison must include this cost alongside mortgage interest, taxes, and maintenance.
Does this calculator account for the mortgage interest deduction?
Yes — toggle "Itemize mortgage interest deduction" to include a simplified tax benefit in the buy cost.
- ›The calculator assumes a 22% marginal rate and deducts mortgage interest above the standard deduction.
- ›Standard deduction in 2024: $14,600 (single) / $29,200 (married filing jointly).
- ›Only the interest exceeding the standard deduction produces additional tax savings.
- ›About 90% of taxpayers take the standard deduction — many homeowners receive no incremental tax benefit.
For most borrowers in the middle of their loan term (when interest is declining), the benefit is modest or zero.
What maintenance rate should I use?
The commonly cited rule is 1–2% of home value per year. On a $400,000 home that's $4,000–$8,000 annually — often the single most underestimated cost of ownership.
- ›New construction (under 10 years): ~0.5–1% annually.
- ›Mid-age homes (10–25 years): ~1–1.5% annually.
- ›Older homes (25+ years): 1.5–2%+ annually; major systems (roof, HVAC, plumbing) more likely to need replacement.
- ›High-cost markets: materials and labor inflate maintenance costs beyond the percentage.
Start with 1% and adjust based on your home's age, condition, and local labor costs.
Does the calculator include closing costs?
The current version models ongoing costs but does not add upfront closing or selling costs. Including them would push the break-even year later.
- ›Buying closing costs: typically 2–5% of purchase price (appraisal, title, origination, escrow).
- ›Selling costs: typically 5–6% realtor commission + 1–2% closing costs = 6–8% total.
- ›On a $400,000 home, combined transaction costs can be $30,000–$50,000.
- ›These costs create a substantial hurdle that only long holding periods can overcome.
When manually factoring these in, add them to the net buy cost in the first year of the analysis.
Why does buying look better over longer time horizons?
Three compounding effects simultaneously favor buyers the longer they hold:
- ›Fixed principal payment: your mortgage P&I never rises while rent inflates 3–4% annually.
- ›Equity growth: loan balance falls each month while home value (hopefully) appreciates.
- ›Rent inflation: $2,000/month rent growing 3%/yr becomes $2,688/mo in 10 years — ownership avoids this.
The longer you hold, the more these effects compound in the buyer's favor — and the more transaction costs are amortized over more years of benefit.