1. The simple comparison most people make
Most people compare their rent to a mortgage payment and stop there. But that's misleading, because buying involves costs that renting doesn't:
- Down payment — a large lump sum locked into the home
- Closing costs — 2%–5% of the home price, paid upfront
- Property tax — ongoing, and it rises with home value
- Home insurance — mandatory in most markets
- Maintenance — 1% of home value per year, sometimes more
- Selling costs — agent commissions, legal fees when you sell
On the other hand, buying builds equity — you own an appreciating asset and pay down principal every month.
2. The true cost comparison
The right comparison is what you spend and what you end up with in each scenario:
- Renting true cost: total rent paid − investment gains on the money you didn't spend on a home
- Buying true cost: total payments (mortgage + costs + maintenance) − home equity at the end
💡 This calculator computes both, along with the net worth you'd build in each scenario. The option with the higher net worth wins.
3. The opportunity cost — the biggest hidden factor
If you rent, you keep your down payment and don't pay closing costs. That money can be invested. Over 7–10 years, a $90,000 down payment invested at 7% grows to roughly $150,000.
If you buy, that same $90,000 is now home equity. It grows with appreciation — typically 3%–5% per year. Over the same period, $90,000 at 4% becomes roughly $123,000 in home equity (before selling costs).
⚠️ The investment alternative to buying is often underappreciated. In markets where rents are low relative to home prices, renting and investing can outperform buying — significantly.
4. The break-even point
Buying has high upfront costs — down payment, closing costs, and initial interest-heavy payments. It takes time for appreciation and equity to catch up.
Typical break-even horizons:
- Low-price, high-rent markets: 2–4 years
- Balanced markets: 4–7 years
- High-price, low-rent markets: 7–12+ years
If you'll move before break-even, renting usually wins. If you plan to stay well beyond it, buying usually wins.
5. What matters most in the math
| Factor | Favors buying | Favors renting |
|---|---|---|
| Home appreciation | High (5%+) | Low or negative |
| Rent vs price ratio | Rents are high relative to prices | Prices are high relative to rents |
| Investment returns | Low (4%–5%) | High (8%+) |
| Time horizon | Long (7+ years) | Short (under 5 years) |
| Mortgage rate | Low (under 5%) | High (7%+) |
| Maintenance & taxes | Low carrying costs | High carrying costs |
6. What the calculator doesn't capture
Money is only part of the decision. Buying also gives you:
- Stability — no landlord can ask you to move
- Freedom to renovate — make it your own
- Community roots — stay in the same neighbourhood long-term
- Forced savings — equity builds whether you're disciplined or not
- Leverage — you control a large asset with a small down payment
Renting gives you:
- Flexibility — move for a job, relationship, or opportunity
- No maintenance — the landlord handles repairs
- Lower transaction costs — moving is cheaper than selling
- Capital freedom — your money stays liquid and invested
7. Common mistakes
- Comparing rent to mortgage only. The full owning cost includes tax, insurance, maintenance, and opportunity cost.
- Ignoring closing costs. 2%–5% of the home price, paid upfront and rarely recovered quickly.
- Assuming appreciation. Home prices don't always go up. In real terms, some markets have been flat for decades.
- Forgetting selling costs. When you sell, agent commissions and legal fees take 5%–8% off the sale price.
- Buying for the wrong reason. "Renting is throwing money away" is a slogan, not a financial analysis.
- Not stress-testing. If rates rise or you lose your job, can you still afford the mortgage?
8. How to use this calculator
- Enter the home price and comparable monthly rent.
- Set how long you plan to stay — this is often the deciding factor.
- Enter the down payment %, mortgage rate, and term.
- Adjust assumptions: appreciation, rent inflation, investment return, maintenance, and carrying costs.
- See the true cost difference, net worth in each scenario, and the break-even year.
- Test different scenarios by moving the "how long you'll stay" slider.
9. Final thoughts
Renting is not "throwing money away," and buying is not automatically "building wealth." Both are financial tools. Which one works for you depends on your timeline, your market, and your life.
If you plan to stay for a decade or more, buying usually wins — especially if rents are high relative to prices. If you might move in 3–5 years, or if your market has very high prices relative to rents, renting and investing often comes out ahead.
Run the numbers. Then decide based on both the math and your life.