Rent vs Buy Calculator
A practical way to compare monthly cash flow, equity, and a simple “invest the difference” rent scenario, without a spreadsheet.
Show assumptions summary
This is an educational estimate. It ignores taxes, opportunity cost details, PMI, and local specifics. Use it to compare scenarios quickly, then validate with your actual quotes.
Quick recommendation: run 2-3 scenarios (conservative, baseline, optimistic) and see how sensitive the outcome is to your time horizon and assumptions.
What this rent vs buy calculator is doing
The rent vs buy question is really two questions at once: (1) what is your monthly cash flow, and (2) what assets do you end up with after a few years? Renting usually keeps your monthly obligations simpler, while buying turns part of your payment into home equity and exposes you to home price changes. This calculator compares both choices over a specific “time in home” horizon, because staying 2 years versus 12 years can flip the result.
For the buying path, we estimate a fixed-rate mortgage payment, add typical ownership extras (tax, insurance, HOA, and a maintenance allowance), and then estimate your net sale proceeds at the end of the horizon. That net proceeds number is your equity after paying selling costs and the remaining loan balance.
For the renting path, we sum rent (with a yearly rent increase) plus renter’s insurance. To keep the comparison fair, we also model a common strategy: invest the money you didn’t put into a down payment (and the ongoing monthly difference if buying costs more). That investment balance is subtracted from the rent cash outflows to form an estimated “net cost of renting.”
How to use it (the 60‑second method)
- Start with a realistic time in home (how long you expect to stay). If you’re unsure, try 5 and 8 years.
- Use your best current estimate for mortgage rate and closing costs. Even small fee changes can matter for short horizons.
- Enter property tax, insurance, and a maintenance percent. If you don’t know maintenance, 1%/year is a common planning placeholder.
- Set rent increase based on your local market (and your lease history), then choose a conservative investment return for the “invest the difference” model.
- Compare the net costs and then tweak one variable at a time (time horizon, appreciation, rate) to see what actually drives your outcome.
What the results mean (and what to watch for)
Buy: estimated net cost is the total cash you put in (down payment, buying closing costs, and monthly costs) minus what you get back when you sell (after selling costs and paying off the remaining loan). It is not the same as “total payments,” because equity comes back to you at sale.
Rent: estimated net cost is total rent + renter’s insurance minus the modeled investment balance (down payment money you kept plus any monthly difference you invested). This is a simplified lens on the common advice: “If you rent, invest the difference.” In real life, you might not invest every month, and returns aren’t guaranteed, so it’s smart to test a lower investment return too.
The difference is shown as rent minus buy. If the number is negative, the rent strategy is cheaper under these assumptions. If positive, buying is cheaper. When it’s close to zero, your decision is less about math and more about lifestyle, flexibility, and risk tolerance.
The biggest drivers: time horizon, appreciation, and transaction costs
Most rent vs buy outcomes are dominated by three inputs. First, how long you stay: buying has front-loaded costs (closing costs and selling costs), so short stays often favor renting. Second, home price change: modest appreciation can improve the buying case, while flat or negative appreciation can tilt toward renting. Third, transaction costs: buying and selling costs are real friction, and they matter more the shorter your horizon.
FAQ
Is this calculator telling me what I should do?
No, it’s a scenario tool. It shows which option looks cheaper under the assumptions you choose, over your time horizon. If the result is close, treat it as a sign that non-math factors (flexibility, stability, maintenance burden) matter more.
Why does “time in home” matter so much?
Buying has big one-time costs: closing costs upfront and selling costs when you exit. Those costs get “spread out” over time. If you move sooner, there’s less time for equity and appreciation to offset those transaction costs.
Does the buy calculation include principal as a cost?
Principal payments aren’t treated as a permanent cost. They reduce your loan balance and typically come back to you as equity when you sell. That’s why the buy result subtracts estimated sale proceeds after paying off the remaining mortgage.
What about PMI, taxes, and deductions?
This version does not model PMI, income taxes, itemized deductions, or local credits. Those can matter a lot. Use this page for a clean baseline, then adjust with your lender quote and tax situation.
How accurate is the appreciation and rent increase modeling?
It uses simple compounding. Real markets are uneven (flat years, jump years). The best approach is to test a low, mid, and high appreciation scenario and see whether your decision changes.