Quick answer
Use this calculator to compare the long-term financial cost of renting versus buying under your specific assumptions. It replaces rules of thumb like "buying is always better" with scenario-based analysis tied to your timeline, local costs, and opportunity cost of capital.
How to use this calculator
This model answers one practical question: given your assumptions about costs, growth rates, and time horizon, which path leaves you with more wealth at the end?
Use the first run as a baseline, then adjust assumptions to see how sensitive the result is to changes.
1. Set your rent inputs
Enter current monthly rent and expected annual rent growth. Include renter's insurance if applicable.
If you are unsure about rent growth, 3% to 4% per year is a reasonable starting range for most US metro areas, though local conditions vary.
2. Set your purchase inputs
Enter the home price, down payment percentage, mortgage rate, and loan term. Include property tax rate, homeowner's insurance, HOA fees if applicable, and estimated annual maintenance as a percentage of home value.
If you are unsure about maintenance, 1% to 2% of home value per year is a standard planning assumption. Older homes and larger properties tend toward the higher end.
3. Set shared assumptions
Enter your expected investment return rate (what your down payment and monthly savings could earn if invested instead), home appreciation rate, and your expected time horizon.
4. Compare scenarios, not single runs
Run at least two cases: one where buying looks favorable (longer horizon, strong appreciation) and one where renting wins (shorter stay, lower appreciation). If the result flips easily, the decision is close and non-financial factors may matter more.
High-impact assumptions
Some inputs shift the result far more than others. Focus calibration effort here first.
Time horizon -- the single biggest factor
How long you plan to stay in the home is usually the dominant variable. Buying involves large upfront costs (closing costs, moving, furnishing) and large exit costs (agent commissions, transfer taxes, staging). These fixed costs must be amortized over years of ownership to break even against renting.
In many markets, the breakeven point falls somewhere between 5 and 8 years. If your expected stay is shorter than the breakeven, renting often wins even with generous appreciation assumptions.
Home appreciation rate
Appreciation directly offsets the carrying costs of ownership. National long-run averages hover near 3% to 4% nominal, but individual markets vary widely. Some metros have sustained 5% or more over decades; others have been flat in real terms for long stretches.
If your plan only works with 6%+ annual appreciation, it depends on an optimistic outcome. Run a case at 2% to 3% and confirm the decision still holds.
Rent growth rate
Rent growth compounds against the renter over time. Even modest differences matter over a decade. If rent grows at 4% instead of 3%, a $2,000/month rent becomes roughly $2,960 versus $2,690 after ten years -- a difference of $270/month by year ten.
Use local historical rent growth if available. National averages may not reflect your specific market.
Opportunity cost of capital
The down payment and closing costs you put into a home cannot simultaneously be invested elsewhere. If a comparable home costs $400,000 and you put 20% down, that $80,000 plus perhaps $12,000 in closing costs is $92,000 of capital that could be earning returns in an index fund or other investment.
At a 7% annual return, $92,000 grows to roughly $181,000 over ten years. This opportunity cost is often the most underappreciated factor in the rent vs. buy calculation.
Maintenance and transaction costs
Ownership costs beyond the mortgage payment add up significantly. A standard planning model includes:
- *Maintenance and repairs*: 1% to 2% of home value per year. On a $400,000 home, that is $4,000 to $8,000 annually.
- *Buying transaction costs*: closing costs typically run 2% to 5% of purchase price.
- *Selling transaction costs*: agent commissions plus transfer taxes and preparation costs typically run 6% to 10% of sale price.
- *Property taxes*: vary widely by location, from under 0.5% to over 2% of assessed value annually.
- *Insurance*: homeowner's insurance is typically several times more expensive than renter's insurance.
These costs are real cash outflows that reduce the net financial benefit of ownership.
Common mistakes to avoid
These mistakes cause people to misjudge which option is better for their situation.
1. Comparing monthly mortgage payment to monthly rent
A mortgage payment is not the full cost of ownership. Property taxes, insurance, maintenance, HOA fees, and opportunity cost of the down payment all add to the true monthly cost. A $2,200 mortgage payment on a home comparable to a $2,000/month rental may actually cost $3,200 or more per month when all ownership costs are included.
2. Ignoring the opportunity cost of the down payment
The down payment is not "gone" in either scenario -- but it is deployed differently. When renting, that capital can be invested. When buying, it becomes home equity that only produces returns through appreciation. Failing to model the alternative investment return on the down payment biases the comparison toward buying.
3. Using national averages for local decisions
Home appreciation, rent growth, property taxes, and insurance vary enormously by metro area and even by neighborhood. A decision that makes financial sense in one city may not in another. Use local data whenever possible.
4. Underestimating maintenance and repair costs
New homeowners frequently budget too little for maintenance. Roofs, HVAC systems, appliances, and plumbing all have finite lifespans. Budget at least 1% of home value per year, and consider 1.5% to 2% for older homes.
5. Assuming you will stay longer than you actually will
Life changes -- job relocations, family size changes, neighborhood preferences -- frequently cause people to move sooner than planned. If you sell before the breakeven point, buying may have been the more expensive path. Be honest about your likelihood of staying.
Scenario playbook
Use these three reference scenarios to bracket your decision.
Short stay (3 years or less)
- High transaction costs relative to time in home.
- Unlikely to recoup closing costs and selling costs through appreciation alone.
- Renting usually wins unless appreciation is unusually strong or rent is unusually high relative to purchase price.
Test this case with your local numbers. If buying still loses at 5% appreciation, the short timeline is dominant.
Medium stay (5 to 8 years)
- This is the most sensitive range where small assumption changes flip the result.
- Run multiple scenarios varying appreciation (2% to 5%), rent growth (2% to 4%), and investment return (5% to 8%).
- If buying wins in most combinations, it is likely the better financial choice. If results are mixed, non-financial preferences (stability, customization, flexibility) should guide the decision.
Long stay (15+ years)
- Transaction costs are amortized over many years and become less significant.
- Mortgage payments become fixed while rent continues to grow, creating an increasing monthly cost advantage for ownership over time.
- Buying usually wins financially in this range unless the local market has poor appreciation or the opportunity cost of capital is very high.
Even in the long-stay case, confirm the result with a conservative appreciation assumption. A 15-year plan at 2% appreciation looks very different from one at 5%.
What this calculator does and does not model
Use the tool for what it is strong at and supplement with other tools where needed.
Strong at
- Side-by-side total cost comparison over a defined time horizon.
- Sensitivity testing across appreciation, rent growth, and return assumptions.
- Making the opportunity cost of the down payment explicit.
- Producing a clear breakeven timeline.
Not designed for
- Tax implications of mortgage interest deductions or capital gains exclusions (these vary by income, filing status, and state).
- Detailed mortgage amortization and refinancing scenarios -- use the Mortgage Calculator for that.
- Cash flow feasibility and monthly budget impact -- use the Budget Planner to validate affordability.
- Long-term portfolio projections for the renting-and-investing path -- use the FIRE Calculator for that.
Frequently asked questions
When does buying usually win financially?
Buying tends to win when you stay long enough to amortize transaction costs (typically 5 to 8+ years), when local appreciation is at or above the national average, and when the price-to-rent ratio in your area is moderate (roughly below 20). The longer you stay, the more ownership benefits from a fixed mortgage payment while rent keeps rising.
What about building equity -- isn't that an advantage of buying?
Equity accumulation is real, but it is not free. Each dollar of equity built through mortgage payments is a dollar that could have been invested elsewhere. The relevant question is whether home equity grows faster than your alternative investments after accounting for all ownership costs. This calculator makes that comparison explicit.
How does the appreciation rate change the math?
Appreciation is one of the most powerful inputs. On a $400,000 home, the difference between 2% and 4% annual appreciation is roughly $95,000 in additional home value over ten years. That alone can flip a result from "renting wins" to "buying wins." This is why running multiple appreciation scenarios is essential -- no one knows future appreciation with certainty.
Should I factor in the mortgage interest tax deduction?
The mortgage interest deduction benefits fewer households since the 2017 standard deduction increase. If your total itemized deductions (including mortgage interest, state and local taxes, and charitable giving) do not exceed the standard deduction, the mortgage interest provides no additional tax benefit. For those who do itemize, the benefit is real but often smaller than expected. This calculator does not model taxes directly, so if you itemize, you can adjust the effective mortgage rate slightly downward to approximate the benefit.
What if I am deciding between two specific properties or locations?
Run the calculator twice with location-specific inputs (local rent, local home price, local property tax rate, local appreciation estimate) and compare. The rent vs. buy math can look completely different across cities or even across neighborhoods within the same city.
Educational use note
This content is educational and scenario-based. It is not financial, legal, or tax advice. Use conservative assumptions, compare multiple scenarios, and consult qualified professionals before making irreversible decisions.