Rent vs Buy Calculator

About the Rent vs Buy Calculator

The rent vs buy calculator performs a rigorous financial comparison of two pathways to housing — ownership and renting — over a time horizon you choose, from 5 to 20 years. The decision between renting and buying is one of the most consequential financial choices most people make in their lifetimes, and it is also one of the most emotionally charged, which makes calm, data-driven analysis all the more valuable. The popular wisdom that 'renting is throwing money away' is a significant oversimplification. Renting is paying for the right to live somewhere — a service with real value. Buying involves borrowing an enormous sum of money at interest, paying stamp duty, paying maintenance, paying council rates and insurance, and only slowly building equity as the loan is repaid. In the early years of a mortgage, the vast majority of each payment is interest — on a $600,000 loan at 6.5%, approximately $3,250 of the first $3,790 monthly payment (86%) is interest, not equity. What makes buying financially powerful over time is the combination of compulsory saving through mortgage repayment, leverage (you control a $600,000 asset with a $120,000 deposit), and capital growth, where the asset's value grows on the full property price while your deposit was only 20% of it. The calculator models all of this with full transparency: it shows the buyer's growing equity position, the cumulative cost of ownership including maintenance, rates, and insurance, and compares this to what a renter would accumulate if they invested the equivalent deposit and any monthly cost savings into a diversified investment portfolio at a specified return rate. The rent vs buy break-even year — the point at which the buyer's net worth first exceeds the renter's investment portfolio — is a critically important output. In expensive markets like Sydney, London, and Vancouver, this break-even can be 10–15 years due to high entry costs (particularly stamp duty), low initial yields, and high property prices relative to rent. In more affordable markets, the break-even may be 3–5 years. If you plan to be in the same location for longer than the break-even year, buying is mathematically ahead. If you expect to move within the break-even period, renting may actually leave you better off financially — even without the property's capital growth. The calculator allows you to adjust the key assumptions that drive the outcome: property capital growth rate (historically 5–7% in major AU/NZ/UK cities over 20+ years, but highly variable by location and period), investment return rate (the S&P 500 has returned approximately 10% nominal over the long run, global diversified ETFs approximately 7–9%), annual rent increase, and the holding period. Changing the property growth rate from 3% to 7% dramatically affects the outcome — which is why transparency about your assumptions is essential when making this decision.

How It Works

Each year the calculator runs two parallel simulations. Buyer track: property value grows at the capital growth rate. Monthly mortgage payments reduce the loan balance (split between interest and principal using an amortisation schedule). Annual ownership costs (maintenance = 1% of current property value, council rates, insurance) are added to cumulative costs. Net worth = current property value minus remaining loan balance. Renter track: initial capital (deposit + stamp duty) is invested and compounds at the investment return rate. Each year, the difference between ownership costs and rent paid is added to (if owning costs more) or subtracted from (if renting costs more) the portfolio. Annual rent increases are applied. Net worth = investment portfolio value. Break-even year = first year when buyer net worth exceeds renter portfolio. Example: $650,000 home, 20% deposit, 6.5% mortgage rate, $2,400/month rent, 5% property growth, 7% investment return, 10 years. Year 1: Buyer net worth ≈ $172,500. Renter portfolio ≈ $185,000. Year 6: Buyer net worth ≈ $310,000. Renter portfolio ≈ $268,000. Break-even: Year 5-6.

Tips & Best Practices

• ✓The most important variable in the calculator is how long you plan to stay. Below the break-even year, renting is almost always financially competitive or ahead. Above it, buying typically wins — particularly in markets with strong capital growth.
• ✓Stamp duty is the single biggest reason renting beats buying in the short term. In Victoria, stamp duty on a $700,000 property is approximately $37,000 — money that must be recovered through capital growth before the buyer breaks even on transaction costs alone.
• ✓Be honest about property growth assumptions. The 6–7% long-run average in Australian capital cities includes compound growth over multiple decades that included periods of very high inflation. For planning purposes, 4–5% is a more conservative assumption for the next decade.
• ✓The investment return rate for the renting scenario significantly affects the outcome. Using 10% (historical US equities) versus 7% (global diversified, more conservative) changes the result materially. If you invest in savings accounts at 5%, buying looks better much faster.
• ✓Maintenance costs are systematically underestimated by buyers. Experienced property investors budget 1% of property value per year ($6,000 on a $600,000 home) for ongoing maintenance, repairs, and eventual capital works like roof replacement, painting, and appliance replacement.
• ✓The rent vs buy decision has significant non-financial dimensions: stability and security (owning provides certainty of tenure that renting does not), freedom (renting allows relocation without transaction costs), and community (owners tend to invest more in their neighbourhoods). The financial analysis should inform but not entirely determine this decision.
• ✓Negative gearing in Australia means that investment property losses (where interest and expenses exceed rental income) can be offset against other income, reducing tax. This improves the effective return on property investment beyond what the calculator shows for a primary residence.
• ✓Timing the market is extremely difficult. Many people who wait for 'the right time to buy' find that prices have grown faster than their savings rate during the waiting period. The break-even analysis is more useful than trying to predict market peaks and troughs.

Who Uses This Calculator

People who have been renting for years and feel social pressure to buy use the calculator to make a data-driven decision independent of the prevailing cultural narrative. Young professionals in expensive cities compare the break-even year against their likely tenure in that city — if they expect to relocate within 5 years for career reasons, the calculator may show renting is genuinely smarter financially for that period. Couples debating whether to buy now with a small deposit (and pay LMI) or wait another 2 years to save more use the calculator to model whether waiting costs more in missed capital growth than it saves in LMI. Investors comparing residential property versus shares as investment vehicles use the rent vs buy calculator to understand the leverage effect of property and the opportunity cost of capital tied up in a deposit. Retirees considering whether to sell their home, invest the proceeds, and rent compare the investment portfolio growth against the imputed rent value of owning their home outright.