Borrow smart. Keep your capital working.

How does the Capital Reinvestment Calculator work?

When you purchase an asset — such as a vehicle, piece of equipment, or machinery — you typically have two options: use your own capital to buy it outright, or borrow the funds and keep your capital working elsewhere. This calculator helps you understand the financial difference between those two strategies.

Enter the amount you are considering borrowing, select a loan term of 36, 48, or 60 months, and enter the interest rate on your loan. The calculator will show your estimated repayments and total interest cost. On the right, you can then select an expected annual growth rate — representing what you believe your capital could return if reinvested — and see how that projected growth compares to the interest you would pay on the loan.

Let debt work for you — not against you

There is a common misconception that debt is always something to avoid. In reality, smart business owners and investors have long understood that borrowing at a lower cost than the return your capital can generate is one of the most powerful wealth-building strategies available. When managed well, debt is not a burden — it is a tool.

If you can borrow funds at, say, 9.95% per annum to finance an asset, and your freed-up capital is able to generate returns of 20%, 30%, or more through reinvestment into your business, the numbers are firmly in your favour. You are effectively using the bank's money to acquire the asset you need, while your own capital does the heavier lifting and compounds in value over the same period.

The key question is not whether to take on debt — it is whether the return on your capital exceeds the cost of the loan. When it does, borrowing is the smarter financial decision.

What could your capital achieve inside your business?

Capital deployed into a growing business often generates returns that far outpace the interest rate on a finance agreement. Here are just a few of the ways business owners reinvest their capital to create compounding value:

• Marketing and lead generation. Investing in digital advertising, content, SEO, or brand campaigns can generate a consistent pipeline of new customers. A well-run marketing strategy can return multiples on every dollar spent — far exceeding a typical loan interest rate.
• Hiring and growing your team. Bringing on the right staff at the right time can unlock capacity that your business simply cannot grow without. A skilled hire can generate revenue, improve efficiency, and free up the owner to focus on higher-value work — all of which compounds over time.
• Buying and selling products or stock. For product-based businesses, having capital available to purchase inventory in volume — or to move quickly on a buying opportunity — can dramatically improve margins. Buying at the right price and selling at the right time is one of the oldest and most reliable ways to generate strong returns on capital.
• Systems, technology, and efficiency. Investing in software, automation, or better tools often reduces operating costs and increases output — improving your bottom line in ways that continue to pay off year after year.
• Expanding into new markets or locations. Capital gives you the flexibility to move quickly when a growth opportunity arises — whether that is opening a new location, launching a new product line, or entering a new market before a competitor does.

In each of these scenarios, the capital you retain by financing an asset rather than buying it outright could be generating returns that significantly outweigh the cost of the loan. That is the core principle behind capital reinvestment — and why so many successful New Zealand businesses choose to finance their assets rather than deplete their reserves.

Why do New Zealand businesses borrow to preserve capital?

Many New Zealand businesses and investors choose to finance asset purchases rather than draw down on their capital reserves. By borrowing, they preserve liquidity, maintain a buffer for unexpected costs, and keep funds available for higher-returning opportunities. This approach is sometimes called leveraged asset acquisition or capital preservation finance.

The decision comes down to opportunity cost: if the return you expect on your capital is greater than the interest rate on the loan, borrowing is the smarter financial strategy — even after accounting for the total cost of the loan. This calculator exists to help you make that comparison clearly and confidently, so you can put your capital where it will work hardest for you.