How much equity do I have? A case study.
"How much equity do I have?" is one of the first questions every property investor asks. Sarah and Michael thought their answer was $510,000. They were $184,000 off the mark. Find out how to calculate equity and how it affects you as a property investor.
Sarah and Michael thought they had enough equity to buy their second investment property outright. The bank's number told a very different story - and the gap between the two is one every investor needs to understand before they go shopping.
What Equity Actually Is
Equity is one of the most talked-about words in property investment, and for good reason. It's the mechanism that lets most Kiwi investors move from owning one property to owning several, without needing to save an entirely new deposit from scratch each time.
At its simplest, equity is the difference between what your property is worth and what you still owe on it. Pay down your mortgage, or watch your property's value grow, and your equity grows with it.
It comes up constantly in property conversations because it drives most portfolio growth in New Zealand. Ask any established investor how they bought their second, third, or fourth property, and the answer almost always involves equity from an existing property, not a fresh pile of cash saved from salary.
That's why it gets talked about so much, and also why it gets misunderstood so often. The word gets used casually to mean "value minus debt," which is true in an accounting sense but isn't the number that determines what you can actually borrow against.
There's a difference between the equity you have on paper and the equity a bank will actually lend against, and that gap is where a lot of investors get their plans wrong before they've even started.
The clearest way to see that difference isn't through a formula. It's through a real example.
The Starting Point
Sarah (41) and Michael (43) bought their home in Christchurch in 2018 for $620,000. By 2026, homes.co.nz put its value at around $920,000. Their mortgage balance had been paid down steadily and now sat at $410,000.
By their own maths, that looked like this:
$920,000 (value) − $410,000 (mortgage) = $510,000 in equity
Half a million dollars. To Sarah and Michael, that number meant one thing: they were ready to buy an investment property, and a substantial one at that.
They booked a meeting with an adviser to firm up the plan.
The Number the Bank Actually Uses
Here's where the story changes.
Banks in New Zealand don't lend against the full value of your home. For an existing home used to fund an investment purchase, the standard limit is 80% of the property's current value - this is the Loan-to-Value Ratio (LVR) rule, and it applies regardless of how much your mortgage has reduced.
This is called useable equity.
Run Sarah and Michael's numbers through that rule:
Property value: $920,000
Maximum lending at 80% LVR: $736,000
Current mortgage: $410,000
Useable equity = $736,000 − $410,000 = $326,000
The gap - $184,000 - was equity that existed on paper but wasn't accessible for borrowing purposes. It doesn't disappear or get lost. It simply isn't usable equity in a bank's eyes until the mortgage reduces further or the property's value increases.
Why the Gap Catches So Many People Out
Sarah and Michael aren't unusual. This is one of the most common misunderstandings we see, and it's an easy one to fall into, because "equity" gets used loosely in everyday conversation to mean "value minus debt." That's a true statement about net worth. It's not the number a lender works with.
There's a second layer to this that made the picture even more important to get right: the $326,000 in useable equity isn't $326,000 in cash sitting in a bank account. It's the maximum a bank might lend against the home, but that lending still needs to be serviced.
Michael and Sarah's usable equity told them what deposit-equivalent they could bring to a purchase; their income and existing debt determined how much they could actually borrow on top of it.
This is one of the key gaps that catches investors moving from one property to two - not because the equity isn't real, but because "how much equity do I have" and "how much can I actually deploy" are two different questions with two different answers.
The Lesson, Generalised
If you take one thing from Sarah and Michael's numbers, make it this: the equity figure that matters is (property value × 80%) − mortgage owing, not property value − mortgage owing.
It's a two-minute calculation, and it's one every investor should run before they start looking at listings.
Paper equity tells you your net worth, but useable equity tells you what you can actually do with it. Your income and existing debt then tell you what you can actually service on top of that.
All three numbers matter. Confusing any two of them is how investors end up disappointed at the pre-approval stage, or worse, stretched thin after settlement.
Sarah and Michael's story isn't a cautionary tale about a deal gone wrong - it's a story about a deal that went right, because the real number was found before an offer was made, not after.
The $184,000 gap between what they thought they had and what they could actually use wasn't a loss. It was information. And used properly, that information is exactly what turns a rough idea into a plan that actually works.
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