How does a rent vs buy comparison work?

It compares your net wealth after a chosen period under two scenarios. Buying builds equity through mortgage repayments and home appreciation but incurs interest, rates, insurance and maintenance. Renting keeps your deposit invested, so the comparison weighs home equity against the grown investment less total rent paid.

What is the opportunity cost of a deposit?

If you buy, your deposit is tied up in the house. If you rent, you could invest that deposit elsewhere. The opportunity cost is the return that invested deposit would have earned, which this calculator grows at the investment-return rate you set.

Does New Zealand property always go up?

Historically New Zealand house prices have risen strongly over the long term, but values can fall or stagnate for years, as they did after 2021. The appreciation rate is the single biggest driver of the buy outcome, so test a conservative figure too.

What costs does buying add beyond the mortgage?

Owning adds council rates, house and contents insurance, and ongoing maintenance — commonly estimated at around 1% of the home's value per year combined. These are real cash costs that renting avoids, and the calculator subtracts them from the buy scenario.

Does this calculator store my data?

No. All figures are computed locally in your browser and nothing is uploaded, so your details stay private.

New Zealand Rent vs Buy Calculator

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This New Zealand rent vs buy calculator projects your net wealth after 10 years under both renting and buying, so you can see which path leaves you better off. It accounts for mortgage interest, ownership costs, home appreciation, and the opportunity cost of your deposit.

How it works

The calculator runs two parallel scenarios over the chosen horizon:

Buying — you pay the deposit upfront and make monthly mortgage repayments. Each month interest accrues on the balance while the rest reduces principal, building equity. The home appreciates at the growth rate you set. Ownership costs (rates, insurance, maintenance) are subtracted. Final buy wealth = home value − remaining loan − cumulative ownership costs.

Renting — you keep the deposit invested, growing it at your chosen return rate, while paying rent each month (rising with inflation). Final rent wealth = grown investment − total rent paid.

Net advantage = buy-scenario wealth − rent-scenario wealth

A positive number means buying wins; a negative number means renting wins over the period.

Example

A NZD 800,000 home with a NZD 160,000 deposit at 6.5% interest, versus renting an equivalent home for NZD 650/week, with 4% home appreciation and a 6% investment return. Over 10 years, strong appreciation typically pushes buying ahead — but at lower appreciation or higher investment returns, renting can win.

Notes

The result is highly sensitive to two assumptions: home appreciation and investment return. Small changes flip the verdict, so try optimistic and conservative figures. New Zealand has no stamp duty, which lowers the cost of buying, but transaction and ownership costs are still real. This is a planning estimate, not financial advice.