How Does Equity Work When Buying A Second Home? (2026 Guide)

Thinking of leveraging your home’s value to grow your wealth? Understanding how equity works when buying a second home is the key to unlocking your next move without a cash deposit. As an expert mortgage broker in Brisbane, we’ve designed this guide to break down the difference between total and usable equity, the ‘Rule of Four’ for budgeting, and the tax implications of turning your first home into an investment.

Let’s dive in…

Equity refers to the difference between the value of your home and the amount you owe on your loan. For banks, this difference, along with their safety lending margin, determines how much you can borrow. For instance, if your home is valued at $1 million and you owe $500,000, a bank allowing an 80% loan-to-value ratio means that you could potentially borrow up to $800,000, which, in this example, means you have access to $300,000 in equity. 

You can utilise equity for various purposes, such as installing a swimming pool, buying a car, and, most commonly, buying an investment property. Many investors leverage this strategy to acquire another property without needing another deposit, effectively borrowing the entire purchase price plus associated costs.

If you’re thinking about using your equity for any major purchases, get in touch with the team here at Hunter Galloway – Mortgage Broker Brisbane. We can do a quick assessment and help you to make your equity work for you. 

It’s a common trap many homeowners fall into: looking at their property value, subtracting their loan balance, and assuming that the entire “pot of gold” is ready to spend.

While that big number represents your Total Equity, the bank has a slightly different perspective when it comes to actually handing over the cash. To avoid getting stuck with a “No” from the credit department, you need to understand the difference between what you have and what you can use.

Total equity is simply the market value of your home minus what you owe the bank. If your home is worth $1 million and your mortgage is $500,000, your total equity is $500,000.

This is a great number for your balance sheet, but you can’t actually walk into a bank and withdraw all of it. Why? Because the bank isn’t going to lend you 100% of your home’s value—they need a “safety buffer” in case the market takes a dip.

Usable equity is the amount of value you can actually “unlock” to put toward a deposit for your second home. In Australia, most lenders want to keep your Loan-to-Value Ratio (LVR) at 80% or below to avoid Lenders Mortgage Insurance (LMI).

Here is the simple formula our team uses to find your “real” budget:

Usable Equity = (80% of your property’s current value) – Your existing loan balance.

You might be expecting a baby in the next few months, and your house is getting too small for your growing family, so you need something bigger…

You could be with a partner, thinking about the next stage of your life and wanting to buy a house together.

Or you may be moving interstate for work and want to keep your existing home as an investment property.

Whatever the reason, your first home isn’t often your forever home, and you will eventually get to the point of upgrading your home.

While you might not have the cash for a deposit, you have something much more powerful: equity in your home.

If you have owned your property for over 5 years, you may have gained equity.

You can tap into this equity to create a bigger deposit for your second property and increase your overall budget.

Let’s go through an example of how equity works when buying a second home…

Karen bought her first home 6 years ago for $305,000 in Brisbane with a loan of $250,000.

Since Karen bought her home, she met Dave, fell pregnant, and now wants to move into a bigger home in a better school catchment area.

We got her first home valued today at $500,000, and Karen owes $250,000.

The awesome news is that Karen now has $250,000 equity in her first home, meaning she can withdraw up to $150,000 in home loan equity.

This $150,000 home loan equity can be used as a deposit on her second home.

Here we work through some of the numbers:

Read More: Equity Calculator: How to Work out Your Usable Equity?

You might have an existing home and be wondering: Can I use my property to buy a second home?

To qualify to buy a second home with no deposit, you need the following:

Let’s look at Karen’s example again.

If Karen and Dave wanted to buy a second home and didn’t own an existing one, they would need a cash deposit and savings to get the new place.

But Karen can get a loan against the $250,000 in equity available in her first home and put an 80% loan against this to take out $150,000 in new lending.

($250,000 + $150,000) (Existing Loan + New Loan)

This $150,000 can be used as a deposit to buy a second property!

In other words, Karen doesn’t need any cash or savings as a deposit. She can use the equity in her 1st property to purchase a 2nd home.

If you want to buy a second house or upgrade your first home, you might be wondering: can I rent the first?

The good news is, yes, you can! Let’s look at Karen’s situation again.

Karen has found a second home to buy for $700,000.

The plan is to keep her first home as an investment property and live in the second home.

So Karen wants to rent her first property while she lives in the 2nd one.

So, yes, you can rent out the first home. In fact, the banks might use the rental income from your 1st house towards your overall income.

It can also give you access to tax strategies like Negative Gearing.

Read More: What Is Negative Gearing? Here’s a Simple Plain English Answer

There could be tax benefits for renting and keeping your old home as an investment property.

Note: If you want tax advice, you must speak to your accountant.

But the steps involved in renting out your old home and keeping it as an investment are:

If you want to speak with someone about your situation, call our Home Loan Experts on 1300 088 065 or complete an Online Assessment to see your options.

Read More: How much home can I afford?

When you start moving equity around between your first home and your new one, it’s easy to get tangled in the tax implications. There is one golden rule you need to remember: The ATO looks at the purpose of the loan, not the property used as security.

You might decide to take out a loan against your first home (now an investment property) to fund the deposit for your new home (where you’ll be living).

Because that loan is secured by an investment property, you might assume the interest is tax-deductible. However, this is a common tax trap. Because the purpose of those funds was to buy a private residence (your new home), the interest on that specific portion of the loan is generally not tax-deductible.

If you aren’t careful with how you structure your “split” loans, you could end up with a large debt that offers zero tax benefits.

Expert Tip: To keep your tax affairs clean, we always recommend keeping your investment borrowings in a separate “split” or “sub-account.” This makes it crystal clear for your accountant at tax time which interest is deductible and which isn’t.

Note: Tax laws in Australia are complex and change often. Always chat with a qualified accountant before making final decisions on your loan structure.

While it might be possible to buy a second home, you might be looking at how much debt you are about to get yourself into and asking: can we afford the second property? This is ultimately going to come down to your income and cash flow, but here are a few things to consider:

Once you’ve calculated your Usable Equity, the next question is always: “So, what price range should I be looking at”

Instead of waiting days for a bank pre-approval, you can use a shorthand called the “Rule of Four.” It’s the quickest way to estimate your maximum purchase price while ensuring you have enough “buffer” for a 20% deposit and those pesky acquisition costs like stamp duty and legal fees.

To find your estimated budget, simply take your Usable Equity and multiply it by four.

The Formula: $Usable Equity x 4 = Maximum Purchase Price$

Why Four?

You might be wondering why we don’t multiply by five (since a 20% deposit is one-fifth of the value).

In the real world, buying a second home in Australia involves more than just the deposit. You have to account for:

By multiplying by four, you’re essentially setting aside 20% for the deposit and leaving roughly 5% of the property value to cover these “hidden” costs. This keeps your loan-to-value ratio (LVR) safe and helps you avoid the extra cost of Lenders Mortgage Insurance (LMI).

Example:

If you have $150,000 in usable equity, the Rule of Four ($150,000 x 4) suggests a maximum purchase price of $600,000. This gives you a $120,000 deposit (20%) and $30,000 (5%) to cover your stamp duty and costs.

Estelle is 32 weeks pregnant and has been looking for a new home for her family for the past 8 months.

She finally found the perfect home but isn’t sure if she will qualify for a loan.

She plans to take 5 months off after the birth of her new baby and then go back to work.

Now, let’s look at the income while Estelle is on maternity leave.

Estelle thinks she will have 5 months off work, but we suggest having a bit of a buffer to ensure you have enough money put away for a bit extra. 

So let’s assume 6 months off x $500 shortfall = $3,000 buffer. Plus, you want to add some living expenses.

So, if you have a baby, try to estimate how much time you’re having off and build a safety buffer for this.

Read More: Buying a Home While Pregnant or on Maternity Leave

There are two main ways to access your equity. The first is through a cross-securitisation loan, and the second is a standalone home loan. Let’s take a look at how each works.

Cross-collateralisation, also known as cross-securitisation, is a loan structure in which a loan or loans are secured by two or more properties. This approach allows borrowers to finance the entire purchase price of a property, providing equity permits. 

Imagine you’re interested in buying an investment property worth $500,000. Luckily, you already own a home outright valued at a million. Without the use of equity, typically, you need to provide the bank with a minimum 20% deposit plus additional monies for such things as stamp Duty. However, because you own your home— by cross-securitising both properties, you can borrow the entire purchase price plus the additional costs such as stamp duty. This means you could borrow $525,000 to cover all the costs, including the purchase price. This loan amount would be secured by both properties — that’s, both the existing property and the intended purchase property. 

In this example, we have two properties valued at $1.5 million. The first is an investment property we acquired for $500,000, and the second is the existing home we own for $1 million. Through cross-collateralisation, the bank now holds a combined value of $1.5 million in properties, and in this scenario, we are only borrowing $525,000. Based on our equity position, your loan-to-value ratio would be roughly 35%.

The major downside to cross-collateralisation is that it can limit your future options. For example, if you want to sell your existing home late, you will need to revalue your new home at that point, and if the valuation comes in lower, you might OWE the bank more money.

The main benefit of cross-collateralisation is that banks sometimes give you sharper interest rates.

Crossing your properties within your structure can have pros and cons, so we suggest speaking with a Mortgage Broker to determine what is best for you.

To discuss your situation, contact our Mortgage Brokers on 1300 088 065 or fill in our free online enquiry form to get a callback.

Unlike cross-collateralisation, where multiple properties secure a loan, standalone securities focus on securing loans with single properties. 

Let’s use a previous example to illustrate this. In this scenario, you would need to have two loans instead. The first loan is $400,000, which is secured against the investment property valued at $500,000. This loan represents 80% of the property’s value and, by doing so, allows you to avoid paying mortgage insurance. 

The second loan of $125,000 would be secured by your home, and, as before, you would still be borrowing a total of $525,000. But rather than being one loan secured by two properties, you have two loans separately secured by two different properties, allowing you to use two different banks if you so desire.

Both cross-securitisation and standalone home loans allow you to access the equity in your property, but they do it in two different ways.

You will want to talk to the bank or your Mortgage Broker about this before you sign any forms.

In a cross-collateralised structure, the bank will look at combining both loans and properties.

Let’s look at the cross-collateralised example:

The problem with this structure is if you go to sell your first home down the line, the bank can ask you to get a new bank valuation.

A better structure would be like this.

The 1st home and 2nd home would be standalone secured, meaning you could sell or refinance either and not need to get new valuations. So, if the market were to change, you’d be protected.

While different rates and products have an effect, the valuation makes the largest difference.

We have seen valuations make or break buying a second property.

For example, we recently helped this client, and we managed to get them a $130,000 increase in their property valuation by looking at another bank.

Assuming an 80% LVR loan, that is $104,000 in additional home loan equity they used towards buying a second home.

Read More: How to Challenge a Bank Valuation

Yes, you could be, depending on the valuation of your first home. If your lending is over 80% LVR, you would need to pay lenders mortgage insurance

To tap into the equity in your home, you have two primary options: refinance your mortgage or increase your current loan through a top-up application. Refinancing involves switching your mortgage to a different provider, while a top-up means you stay with your current bank but increase your loan amount.

The initial step in both processes is to get your bank to complete a valuation, which will ultimately determine how much equity is available in your home. It’s important to note that the banks use various third-party valuation firms to assess your property’s value. Companies like Heron Todd White, CBRE, and JLL are a few of the third parties that the banks use. Since these firms are independent of the banks, the same firm may conduct valuations for different banks, potentially leading to an identical valuation outcome regardless of the bank.

So, if you want to maximise the equity release, consider obtaining several valuations simultaneously. A skilled mortgage broker can facilitate this, helping you identify suitable lenders and arrange for cost-free valuations. After receiving the bank’s valuation, you’ll know how much equity you can access.

Read more: How to challenge a bank valuation.

To access equity, you must apply for financing via a home loan application. However, complexities can arise because each bank adheres to its own set of equity release policies. For example, say you have $100,000 in accessible equity you want to withdraw. This scenario is commonly referred to as a cash-out home loan, and Banks scrutinise these very closely, especially when the cash-out amount exceeds $50,000. 

In these cases, you may require evidence of the intended use. For example, the bank may ask for a purchase invoice if you’re looking to buy a car using equity in your home. Each bank’s approach to this situation varies significantly. A great mortgage broker can streamline this, connecting you with lenders whose requirements align with your circumstances, possibly even bypassing the need for such evidentiary information.

A common question we get asked often is: If I have a lot of equity in my home, why can’t I borrow more money? The answer lies in understanding that equity is not the same as borrowing capacity. Lenders analyse two key factors when considering your loan application: your capacity to repay the loan and the collateral you offer.

Firstly, they assess your borrowing capacity by calculating your income minus expenses. Essentially, the higher your income and the lower your expenses, the more you can borrow. Suppose you have $2 million in cash, which means you have ample collateral but no income. While you may satisfy their collateral criteria, in the absence of income, your borrowing capacity is nil, ultimately meaning that, in this scenario, the bank would be unable to assist you with a loan.

Secondly, collateral plays a critical role. This includes savings, deposits, equity, and property. Imagine you earn a million a year but lack collateral. That means you don’t have a deposit or equity despite having a huge income and high borrowing capacity. Banks couldn’t lend you any money because you actually don’t meet their collateral requirements.

In both scenarios, it’s clear that collateral and capacity are essential for the loan to be approved by the bank. This highlights how critical both are, and it doesn’t necessarily mean that the more equity you have, the more the bank can lend to you.

Remember, every home loan situation is different, and you need an expert to help you with your situation.

Our team of home loan experts at Hunter Galloway is here to help you buy a home in Australia. Unlike other mortgage brokers who are just one-person operations, we have an entire team of experts dedicated to helping make your home loan journey as simple as possible.

If you want to get started, please give us a call on 1300 088 065 or book a free assessment online to see how we can help.

Looking for more resources for homebuyers? We’ve got you covered. Here are a few we’d recommend you read next.