You bought your first place a few years ago. The value has climbed, you have been chipping away at the loan, and now you are starting to wonder whether that growth could do more than just sit there on paper. That is the exact moment most investors start thinking about using equity to buy an investment property, and it is also the moment where a lot of good intentions quietly fall apart.

I get it. The idea of buying your next property without saving another deposit from scratch sounds almost too good. And in a lot of cases it genuinely works. But the gap between “I have equity” and “I own a second investment property” is wider than the brochures make out. I have seen this play out dozens of times, and the people who get it right treat the equity as the start of the conversation, not the end of it.

So let me walk you through how it actually works, what the banks are really looking at, and where folks get caught off guard.

What Equity Actually Is (And Why Usable Equity Is the Number That Matters)

Equity is the part of your property you truly own. If your home is worth $800,000 and you still owe $300,000 on the loan, your equity is $500,000. Simple enough.

The trap is thinking you can touch all of it. You cannot. Lenders work off what they call usable equity, and that is a smaller number. The common rule is that a bank will let you borrow up to 80% of your property’s value, then subtract what you still owe. On that $800,000 home, 80% is $640,000. Take away the $300,000 you owe, and your usable equity is $340,000.

Why 80%? Because once you borrow above that line, you start paying lenders mortgage insurance, which protects the bank, not you. More on that shortly.

Here is what most people get wrong: they see the $500,000 of total equity and start mentally spending it. The bank sees $340,000, and even that is not a blank cheque. Usable equity is your deposit and your costs, not the full purchase price of the next place.

One more thing worth understanding. Equity is created two ways: by paying down your loan, and by your property rising in value over time. If you want to understand what pushes that second lever, it is worth reading our breakdown of what actually drives capital growth in Australian property, because the quality of your equity depends entirely on the quality of the asset underneath it.

Using Equity to Buy an Investment Property: How Much Can You Actually Borrow?

This is where the two halves of the puzzle come together. Having equity is one half. Being able to service the debt is the other, and the second half is the one that stops most people.

Equity gives you the deposit. Borrowing capacity decides whether the bank will hand over the rest. You can have plenty of usable equity and still get knocked back because your income will not cover the repayments on the combined debt.

As a rough guide, some lenders talk about borrowing up to four or five times your usable equity for an investment purchase. On $100,000 of usable equity, that might get you to a $400,000 to $500,000 purchase price once the equity acts as your deposit and costs. These are rules of thumb though, not promises. The actual number comes down to your income, your expenses, your existing debts, and the lender’s own appetite.

The serviceability buffer, and why the bank cares more about income than equity

Right now, lenders have to test your loan against a serviceability buffer. The regulator, APRA, has kept that buffer at 3 percentage points, which means the bank assesses whether you could still meet repayments if your interest rate went up by three points from the actual rate. You can read APRA’s own explanation of the current serviceability buffer settings if you want the detail straight from the source.

On top of that, banks watch your debt-to-income ratio. They are limited in how much they can lend to borrowers whose total debt sits at six times their income or higher. So the more you borrow, the tighter that ratio gets, and the harder your next approval becomes.

To be honest with you, this is the bit that trips up ambitious investors. They assume equity is the hard part. It is not. Serviceability is. And that is where most people come unstuck, because they build a plan around the deposit and forget to check whether the bank will actually fund the loan sitting on top of it.

Getting the Loan Structure Right (Avoiding Cross-Collateralisation)

How you set up the loan matters almost as much as whether you get it.

When you release equity, the cleanest way to do it is through a separate loan split against your existing property. You take that split, use it as the deposit and costs on the new place, and then take a stand-alone loan for the rest of the investment purchase. Two properties, loans kept separate, each one able to stand on its own.

What you want to avoid, in most cases, is cross-collateralisation. That is where the bank ties both properties together as security for both loans. It feels harmless at settlement. It bites later. If you ever want to sell one property, refinance just one loan, or move a single property to a different lender, you have to untangle the whole structure first, and the bank holds all the cards while you do it.

Keeping loans separate also helps at tax time, because the deductibility of interest depends on what the borrowed money was used for. Investment debt should be clean and identifiable. This is exactly the kind of thing where having the right people around you pays for itself, and it is worth being clear on the team you actually need before you buy, especially a good broker and a switched-on accountant.

The Deposit, LMI and the Costs People Forget

Usable equity covers your deposit. It also has to cover the costs that come with buying, and those add up faster than people expect.

If you want to steer clear of lenders mortgage insurance on the investment property, you generally need a 20% deposit. Go below that and LMI kicks in, which can run into the thousands. It is not always a dealbreaker, and sometimes paying it to get into a good asset sooner makes sense, but you need to go in with your eyes open. The government’s MoneySmart site has a plain-English guide to how lenders mortgage insurance works if you want to understand the trade-off.

Then there is stamp duty, which varies by state and is often the single biggest upfront cost after the deposit. On an $800,000 purchase it can be north of $30,000 depending on where you buy. Add legal and conveyancing fees, building and pest inspections, loan setup costs, and a buffer for the first few months of holding the property. None of these are optional, and all of them come out of the equity you release.

The logic is fairly straightforward: your usable equity is not just the deposit, it is the deposit plus every cost of getting the deal done. Plan for the full number, not the headline one.

Using Equity to Buy an Investment Property Without Overreaching

Equity is a tool. Like any tool, it can build something solid or it can do real damage if you swing it carelessly.

When you borrow against your home to buy another property, your existing place is now securing more debt. If values dip, your equity shrinks on both properties at once. If rates climb or a tenant moves out and the place sits empty for a while, you are carrying more holding costs than you were before. That is not a reason to avoid it. It is a reason to build in a buffer.

I have watched people stretch to the absolute edge of what the bank would approve, with nothing left over for the quiet months. Then one repair bill or one vacancy lands and the whole thing turns stressful. The investors who last are the ones who leave themselves room to breathe. If you want a sobering look at how this goes sideways, we covered the most common ways it happens in our piece on avoiding property investment regret.

This approach works best when the next asset is genuinely a good one, bought at a sensible number, with a cash buffer behind it. It works worst when it is used to rush into a mediocre property just because the equity was sitting there.

A Simple Order of Operations

If you are weighing this up, here is the sequence I would run through.

First, get a realistic valuation of your current property. Not the figure you hope for; the figure a bank’s valuer would land on. Then calculate your usable equity: 80% of that value, minus what you still owe.

Second, talk to a broker about borrowing capacity before you fall in love with anything. Find out what you can actually service, not just what deposit you can scrape together. This one step saves people months of heartache.

Third, sort out the loan structure. Separate splits, no cross-collateralisation unless there is a specific reason, and investment debt kept clean for tax.

Fourth, add up every cost, deposit plus stamp duty plus fees plus a holding buffer, and make sure the equity covers the lot with something left over.

Only then do you go looking for the property. Getting the money right first means you can move quickly and confidently when the right deal shows up, and the good ones do not hang around. Many of the best never even hit the open market, which is why knowing how to find off-market property matters once your finance is sorted.

Frequently Asked Questions

How much equity do I need to buy a second investment property in Australia?

There is no single number, because it depends on the price of the property you are buying and your borrowing capacity. As a guide, you want enough usable equity to cover a 20% deposit plus stamp duty and costs on the new place. On a $500,000 purchase, that is roughly $100,000 for the deposit plus another $25,000 to $35,000 for costs. And remember, usable equity is only 80% of your current property’s value minus what you still owe.

Can I use equity to buy an investment property with no cash deposit?

Yes, this is one of the main reasons people use equity. The released equity acts as your deposit, so you may not need fresh savings for that part. What you still need is the income to service the larger total debt, because the bank assesses that separately. Equity solves the deposit problem; it does not solve the serviceability problem.

Is it better to use a line of credit or a loan split to access equity?

For most investors, a separate loan split is the cleaner option. It gives you a defined amount, keeps the investment borrowing identifiable for tax, and avoids tangling your properties together. A line of credit can suit some situations, but it often carries a higher rate and more temptation to dip into it. Talk to a broker about which structure fits your plan, because the right answer depends on your circumstances.

Will using equity affect how much I can borrow later?

It can. Every time you release equity and take on more debt, your debt-to-income ratio climbs and your serviceability tightens. That is why the order you buy in, and how much buffer you keep, affects your ability to keep growing. Building a portfolio is a sequence of approvals, not a single one, so each move should keep the door open for the next.

Key Takeaways: Using Equity to Buy an Investment Property

• Usable equity is roughly 80% of your current property’s value minus the amount you still owe, which is almost always less than your total equity.
• Equity gives you the deposit, but borrowing capacity and the 3 percentage point serviceability buffer decide whether the bank will actually fund the purchase.
• A separate loan split keeps your borrowing clean, while cross-collateralisation ties your properties together and causes problems when you later want to sell or refinance.
• You need a 20% deposit on the new property to avoid lenders mortgage insurance, and the equity must also cover stamp duty, legal fees and a holding buffer.
• Overreaching is the real danger, so leave yourself a cash buffer for vacancies, repairs and rate movements rather than stretching to the bank’s maximum.
• Get your finance and structure sorted before you shop, so you can move quickly when a quality property appears.

Using Equity to Buy an Investment Property: Final Thoughts

Equity is one of the most powerful ways to keep building a property portfolio in Australia, and most people who own a home for a decent stretch end up with more of it than they realise. The growth has already happened. The question is whether you put it to work thoughtfully or let it sit idle.

My honest take, after years of watching how this goes, is that the equity is rarely the hard part. The discipline is. The investors who do well are the ones who check their serviceability early, structure their loans properly, buy a genuinely good asset, and keep a buffer behind them. The ones who struggle are the ones who treat a growing balance on paper as permission to rush.

Done properly, this is not a shortcut around doing the work. It is a way of making the work you have already done count for more. Get the numbers right, get the right people around you, and make sure the next property is one worth owning for the long haul.

If you want a clear read on your own equity position and whether your next purchase stacks up, this is exactly what we help investors work through every week. Book a discovery call with Property Principles here.