
Property Investment
Good debt vs bad debt – can debt be good?
As a property investor, not only can debt be good, but it can also help you grow your wealth faster. Here you’ll learn the differences between good and bad debt.
Property Investment
6 min read
Author: Derry Brown
Financial Adviser in industry since 2007. Investor in Auckland & Christchurch. Previous COO of Global Brand
Reviewed by: Ed McKnight
Our Resident Economist, with a GradDipEcon and over five years at Opes Partners, is a trusted contributor to NZ Property Investor, Informed Investor, Stuff, Business Desk, and OneRoof.
A big mortgage seems great at the start.
You get the house you want without having to save the $600k+ you’d need to pay for it.
But apart from the downside of having to repay a large loan, there’s another dark side to having a big mortgage. One that can either help you build wealth … or potentially wipe it out.
In this article, you’ll learn about the ups and downs of taking on a large mortgage to invest.
Leverage is one of property’s super-powers.
That basically means you can borrow money against the house to buy it, and this can help you make more money.
For example, let’s say you buy a $500k rental property with a 20% deposit.
You only put in $100,000 of your own money, and borrow the other $400,000.
Let’s say this $500k property goes up in value by 10%. It’s now worth $550k and your equity has gone from $100,000 to $150,000.
You made $50k. That’s a 50% return on your original deposit.
So the market went up 10%, but you got a 50% return on your deposit.
That’s because you put in a fifth of the money to buy the house, so however much the market moves, you get 5x that.
I call this the Mortgage Magnifier. And the smaller the deposit (i.e. the more you borrow) the bigger that magnifier gets.
Let’s change the numbers to show what I mean. Let’s say you now buy that $500k property, but this time you use a 10% deposit.
You put $50k in, then the house goes up in value by 10%. It’s now worth $550k.
Your equity has gone from $50k to $100k.
So you’ve turned your $50k deposit into $100k of equity. You received a 100% return, even though the market only went up 10%.
So you got 10x the market return. Why? Because you only put in 1/10th of the money.
It’s this leverage that can make property outperform other investments, like shares or managed funds.
But leverage is a double-edged sword.
The more debt you have, the more risk you take on. Because while the Mortgage Magnifier makes your returns bigger … it also increases your losses.
Let’s come back to that $500k house. Again, you buy it with a 20% deposit ($100k).
But this time prices drop 10%. Your home is worth $450,000. Your equity shrinks from $100,000 to $50,000. That’s a 50% loss on your deposit.
The Mortgage Magnifier works great when house prices go up … but it also makes those losses bigger when house prices dip.
This is the dark side of leverage that many buyers don’t think about.
Yes, it can supercharge your returns, but it can also intensify your losses.
One of our investors at Opes Partners bought a high-end townhouse in Auckland.
She paid $1 million for the property and used a $250,000 deposit (25%).
Unfortunately, she bought at the peak of the market (November 2021).
Since then property prices have fallen by around 12.5%. And if she’d bought the same house in cash, she’d only be down 12.5%.
But because of leverage, she’s down 50% on her equity.
She put in ¼ of the money and borrowed the rest, so her mortgage magnifier is 4x.
Her wealth in the property gets 4x the market return.
The market fell 12.5%, but because of leverage, her equity dropped four times as much – a full 50%.
Naturally, that loss will hit you hard, but here’s what many people forget … while the short-term looks grim, the long-term could tell a different story.
Yes, property values fell 1.5% over the last 12 months (and more before that) but over the last 32 years, houses went up over 6% on average per year.
This investor bought the property for the long term. So, she’s still holding onto the property – and is starting to see signs of recovery.
That’s the upside of leverage … when the market turns, it can lift you just as fast.
Leveraged investments have higher risks. In other words, the value of your equity goes up and down way more than if you didn’t take on any debt.
So before you take on that big mortgage, you’ve got to be comfortable with these three things:
While a big mortgage magnifies your gains and your losses it also makes the potential outcomes wider.
So if you could buy a $500k property all with cash (no mortgage), you have no Mortgage Magnifier. You get the market return and therefore the return you can expect to get per year is pretty stable.
Your expected gain would likely fall somewhere within a bell curve.
But buy that same property with a lot of debt, and the Mortgage Magnifier kicks in.
That makes your potential returns more extreme, so your expected return each year is less certain.
In other words, your equity will bounce around a lot more.
Again, over the long term you’ll likely make much, much more money, but you’ve got to be comfortable with more of those ups and downs.
Investors and financial advisers often talk about minimum investment horizons.
The more risky the investment, the longer you want to hold it for.
For instance, you might want to be in a:
Property is a riskier asset (they go up and down in value more).
So you often want to be prepared to hold it for at least 7 years.
But add in the leverage aspect, and your wealth will go up and down even more.
So because there are more ups and downs (more risk), you really should be prepared to hold it for longer.
Here at Opes, we often recommend being prepared to hold the investment for at least 10-15 years.
If you can do that you’re more likely to make money through property. If you have a short-term focus, leveraged property is probably not for you.
Generally, people who hold on to their properties for longer make money. But, if you sell quickly, you could lose money. A lot of money.
In the last quarter of 2024 CoreLogic divided property sellers into 2 groups:
In one group are those who sold their properties for more than they bought them for. In other words, they made money from property.
On the other are those who lost money from property. They sold their houses for less than they bought them for.
91% of sellers made money. On average they made $289,500 in profit and they’d owned their properties for 9 years.
9% of sellers lost money. They lost an average of $55,000 and they only owned their properties for an average of 3 years.
What does this story tell us? People who panic sell tend to lose money. Those who stay in property for the long term tend to make money.
In theory, holding a property sounds easy. In practice, it’s much harder. Debt isn’t just a financial burden; it’s a psychological one too.
A big mortgage doesn’t just magnify returns (and losses) – it can magnify your stress and anxiety too.
That’s why you need to have a long-term approach if you invest in property. And you need to have an even longer-term approach if you use a big mortgage too.
Financial Adviser in industry since 2007. Investor in Auckland & Christchurch. Previous COO of Global Brand
Derry has been in finance and property since 2007 and was at the coal face through the Global Financial Crisis. I have helped Opes clients invest in over 140 Million Dollar’s worth of residential property. In investing my passion is for data and demographics.