How to Use Home Equity to Build a Property Portfolio

If you’ve owned your home for a few years — whether it’s a house in Engadine, a townhouse in Menai, or a unit in Cronulla — there’s a good chance it’s worth more today than when you bought it. That difference between what your property is worth and what you still owe on it is called equity, and it could be the key to building a property portfolio without needing to save another massive deposit from scratch.

It’s one of the most common conversations I have with clients, and honestly, it’s one of my favourites. Let me walk you through exactly how it works, step by step.

What Is Home Equity?

Home equity is straightforward: it’s the current market value of your property minus your outstanding mortgage balance. If your home is worth $1,000,000 and you owe $400,000, you have $600,000 in equity.

Your equity grows in two ways — as you pay down your mortgage, and as your property increases in value. For many homeowners across the Sutherland Shire, rising property values over the past few years have built up significant equity without them even realising it.

But here’s the important part — you can’t use all of your equity. That’s where usable equity comes in.

What Is Usable Equity?

Usable equity is the portion of your home equity that lenders will actually let you borrow against. Most lenders will allow you to borrow up to 80% of your property’s current value without paying Lenders Mortgage Insurance (LMI). Anything above that 80% threshold and you’ll either need to pay LMI or find a lender with a specific policy for higher LVR lending.

The formula is simple:

Usable Equity = (Property Value × 0.80) – Current Loan Balance

So if your Miranda home is valued at $1,200,000 and you owe $500,000:

• 80% of $1,200,000 = $960,000
• Minus your loan balance of $500,000
• Usable equity = $460,000

That $460,000 could potentially serve as a deposit and cover purchasing costs on one or even two investment properties, depending on where and what you’re buying. That’s real purchasing power sitting inside your home.

Worked Example: How Equity Creates Buying Power

Let’s bring this to life with a realistic scenario.

Sarah and Mark bought a three-bedroom house in Caringbah seven years ago for $850,000. They put down a 20% deposit and have been making regular repayments. Today their home is valued at $1,250,000 and their remaining mortgage is $480,000.

Here’s how their usable equity stacks up:

• 80% of $1,250,000 = $1,000,000
• Minus their loan balance of $480,000
• Usable equity = $520,000

With $520,000 in usable equity, Sarah and Mark could use a portion — say $200,000 — as a deposit and costs for an investment property worth around $800,000 to $900,000 (putting down roughly 20–25%). They’d still have equity left over for future opportunities.

Another example at a lower price point: if your home is worth $850,000 and you owe $340,000, your usable equity is ($850,000 × 0.80) – $340,000 = $340,000. That could be enough to cover the deposit and costs on an investment property in a growth suburb — without touching your savings.

The key takeaway? You don’t need to save up another $100,000+ in cash. The equity you’ve already built is your deposit.

How Do You Access Your Equity?

It’s important to understand that accessing equity doesn’t mean you literally withdraw cash from your home. Instead, your equity becomes security for additional borrowing. There are a few ways to structure this, and the right option depends on your situation and goals.

Refinancing your home loan

This is the most common approach. You replace your existing mortgage with a larger one that accounts for the equity you want to access. The “extra” amount becomes available for your investment purchase. Refinancing often lets me negotiate a better rate for your existing loan at the same time, so you may end up with a lower rate on a larger loan — a genuine win-win.

Equity release or top-up loan

You keep your current home loan as it is and take out a separate loan secured against the available equity. This can be useful for keeping your investment borrowings clearly separated from your owner-occupied debt — which your accountant will appreciate come tax time.

Line of credit

You’re approved for a credit limit based on your equity and draw on it as needed. This offers flexibility but requires discipline, because interest is charged on whatever you draw down.

Each option has different implications for your interest rate, loan structure, and tax position. It’s not a one-size-fits-all decision, which is exactly why it’s worth having a proper conversation before you commit.

Using Equity to Buy an Investment Property

Once you’ve decided to use your equity for investment property, here’s the typical process I walk clients through:

1. Get a property valuation. Before anything else, we need to know exactly what your home is worth today. I can arrange a formal valuation through my lender panel — or in some cases, lenders will accept a desktop valuation, which is faster and cheaper.

2. Calculate your usable equity. Using the formula above, I’ll work out how much equity you can realistically access. I always build in a buffer so you’re not stretching yourself too thin.

3. Assess your borrowing capacity. Having equity is one thing — being able to service the additional debt is another. I’ll run the numbers on your income, existing commitments, and living expenses to confirm what lenders will approve. If you want a quick starting point, try the borrowing power calculator on my website.

4. Structure the loans correctly. This is where having a broker really matters. I always recommend keeping your investment borrowings separate from your owner-occupied loan. The typical structure is:

• Interest-only repayments on the investment portion — this maximises your tax deductions since all interest on an investment loan is tax-deductible
• Principal and interest on your owner-occupied loan — paying this down faster saves you non-deductible interest

5. Find and purchase your investment property. With your finance pre-approved and your structure in place, you can search with confidence. When you find the right property, you’ll be ready to move quickly — which is a genuine advantage in a competitive market.

6. Settle and manage. I coordinate with your solicitor and the lender to get everything settled. Once the property is tenanted, your rental income starts offsetting your holding costs.

What to Consider Before You Invest

Having accessible equity is a great starting point, but it’s not the only piece of the puzzle. Here’s what I work through with every client before we move forward.

Borrowing capacity matters as much as equity. Even if you have $400,000 in usable equity, lenders will still assess whether you can service the additional debt. Your income, existing commitments, and living expenses all factor in. I’ll run the numbers with you upfront so there are no surprises.

Rental income won’t cover everything (at first). Most investment properties are negatively geared in the early years, meaning the rent won’t fully cover the mortgage repayments and holding costs. You need to be comfortable covering the shortfall — and understand how the tax benefits work in your favour.

Loan structure is critical. Setting up the right structure from the start — typically interest-only on the investment portion — maximises your tax deductions and keeps things clean. Restructuring later is possible, but it’s far easier to get it right from day one.

Have a strategy, not just a goal. “I want an investment property” is a goal. A strategy is knowing whether you’re buying for capital growth, rental yield, or both — and understanding how that first purchase sets you up for the next one. I’ll often work alongside your accountant or financial planner to make sure everything is aligned.

Risks and Considerations

Using equity to invest in property can be a powerful wealth-building strategy, but it’s not without risk. Here’s what you need to think about carefully.

Property values can fall. If the market dips and your home’s value decreases, your usable equity shrinks — and in a worst case, you could end up owing more than your properties are worth. This is why I never recommend borrowing to your absolute maximum.

Higher total debt means higher repayments. You’ll be carrying two mortgages (or more). Make sure your cash flow can handle the combined repayments, including a buffer for unexpected expenses like repairs, vacancy periods, or strata levies.

Interest rate changes affect everything. If rates rise, your repayments increase on both your home loan and your investment loan. I always stress-test your numbers at a higher rate before we proceed — if you can’t comfortably afford repayments at 1–2% above current rates, it may be worth waiting.

LMI on the investment property. If you’re borrowing more than 80% of the investment property’s value, you’ll likely need to pay Lenders Mortgage Insurance on that purchase. LMI can add thousands to your upfront costs, so it’s worth factoring in.

Cash flow analysis is essential. Before committing, we’ll map out your full cash position — rental income, mortgage repayments, rates, insurance, property management fees, and maintenance. If the numbers don’t stack up, it’s better to know before you sign a contract.

Why Local Broker Knowledge Matters

Property values across the Sutherland Shire vary significantly — a three-bedroom house in Cronulla sits in a completely different bracket to a similar home in Engadine or Menai. I work with local valuers and understand how different lenders assess properties in our area, which means I can give you a realistic picture of your usable equity before we even lodge an application.

I also know which lenders are more favourable for investment lending right now, which ones offer better serviceability calculations, and which ones will move quickly when you find the right property. That kind of insight saves you time and money.

Frequently Asked Questions

How do I use equity in my home?

You access equity by refinancing your existing home loan to a higher amount, or by taking out a separate loan secured against your property’s value. The equity becomes security for the new borrowing — you don’t withdraw it as cash. A broker can help you choose the right structure for your goals.

How does home equity work in Australia?

Home equity is the difference between your property’s current market value and your outstanding mortgage balance. In Australia, most lenders let you borrow up to 80% of your property’s value without paying Lenders Mortgage Insurance. The portion you can access is called your usable equity.

How can I leverage equity in my home?

The most common way to leverage equity is to use it as a deposit for an investment property. You refinance your home loan or set up a separate facility, then use the released equity to cover the deposit and purchasing costs on a new property — without needing to save additional cash.

How can I use the equity in my home to buy another property?

First, get your home valued to determine your current equity position. Then apply to access your usable equity — typically through refinancing or an equity release loan. The released equity serves as your deposit for the new purchase. I’ll help you structure the loans so your tax position and cash flow are optimised.

How much usable equity do I need to buy an investment property?

Most lenders require a 10–20% deposit on an investment property, plus 4–5% for purchasing costs (stamp duty, legal fees, etc.). So for a $700,000 investment property, you’d typically need $105,000–$175,000 in usable equity. Use the stamp duty calculator to estimate your costs.

Can I use equity to buy a house if I still have a mortgage?

Yes — most homeowners who use equity to invest still have an existing mortgage. What matters is that you have enough usable equity (value above 80% LVR minus your current loan balance) and enough income to service both loans. I’ll assess both factors before we proceed.

Book Your Free Equity Assessment

If you’ve been thinking about using your equity to invest, the best first step is a quick chat. I’ll review your current loan, estimate your usable equity, and map out what’s realistically possible — no pressure, no obligations.

If you’re a first home buyer looking to get onto the property ladder first, check out my First Home Buyer’s Guide to the Sutherland Shire or learn about the grants and schemes available in NSW. And if you’re weighing up your rate options, my guide to fixed vs variable rates in 2026 is worth a read.

See what my clients say about working with me, then give me a call on 0424 175 869 or submit an enquiry at annawilliams.finance. I’d love to help you turn the home you already own into the foundation for something bigger.