Using Equity to Invest in Property: A Practical Guide for Homeowners
Key Takeaways
Usable equity is generally 80% of your home's value minus your loan balance, and it can cover the deposit and costs on an investment property without touching savings.
Equity gives you the deposit, but serviceability decides approval; your whole combined debt is stress-tested at the actual rate plus a 3 percentage point buffer.
Keep the equity release as a separate, clearly labelled split so the investment interest stays cleanly deductible, and weigh standalone security against cross-collateralisation.
Avoid using every dollar of equity; keep a buffer for rate rises, vacancies, and repairs, since you are borrowing against your own home.
For a lot of Australian homeowners, the deposit for a first investment property is not sitting in a savings account; it is already built into the home they live in. Years of repayments and rising property values can leave a meaningful amount of equity behind, and that equity can often be put to work as the deposit on an investment property, without waiting to save a cash lump sum. With property values having grown across many areas, more homeowners are in a position to consider this than they realise.
The appeal is obvious, but so is the need for care. Using equity means increasing your debt and, in most cases, borrowing against the roof over your head. The questions that matter are practical: how much of your equity is actually usable, can you afford the larger combined repayments, and how do you structure the borrowing so it stays clean and flexible? Getting these right is the difference between equity being a smart stepping stone and an overextension.
This article explains what usable equity is, how to calculate it, the ways to access it, and how lenders assess the extra borrowing. The goal is to give you a clear, realistic picture before you start looking at investment properties.
Can you use equity to buy an investment property?
The short answer is often yes. If you have built up enough equity in your home, you can usually use it to cover the deposit and purchase costs on an investment property, with the rest borrowed as an investment loan. This lets you invest without draining your savings or waiting years to accumulate a cash deposit.
The important caveat is that equity alone does not get you approved. You still have to service the larger combined debt under the lender's assessment, and that is where many plans run into their real limit. Equity gives you the deposit; your income and serviceability decide whether the loan is approved.
What home equity means
Equity is simply the difference between what your property is worth and what you still owe on it. If your home is worth $900,000 and you owe $500,000, your equity is $400,000. It is the share of the property you genuinely own.
That figure grows in two ways: as you pay down your loan, and as your property rises in value. The catch is that not all of your equity is available to borrow against. Lenders keep a portion as a safety margin, which is why total equity and usable equity are two different numbers.
Total equity versus usable equity
This distinction trips up a lot of homeowners, because the equity you can actually access is smaller than the equity you hold on paper. Lenders generally will not let you borrow against every dollar of equity, because they want to keep your home within a safe Loan-to-Value Ratio (LVR).
Usable equity is commonly calculated as 80% of your property's value minus your current loan balance. The 80% mark matters because borrowing beyond it usually triggers Lenders Mortgage Insurance (LMI). So while your total equity might be large, your usable equity, the part you can tap without paying LMI, is the figure that drives your plans.
How to calculate usable equity
Working out your usable equity takes one short calculation, and it gives you a realistic sense of what you have to work with. Using the same home worth $900,000 with a $500,000 loan, the steps look like this.
Take 80% of the property value: 80% of $900,000 is $720,000.
Subtract your current loan balance: $720,000 minus $500,000 leaves $220,000.
That $220,000 is your usable equity, available without moving above an 80% LVR on your home.
That usable equity can fund the deposit and purchase costs on an investment property, with the rest borrowed against the new property. As a rough guide, since a deposit plus costs on an investment is often around 25% of the purchase price, $220,000 could support an investment property somewhere in the region of $700,000 to $800,000, subject to serviceability. The valuation your lender uses also matters here, because it sets the property value in the calculation, and it can come in lower than you expect.
Ways to access your equity
There is more than one way to release equity, and the structure you choose affects your flexibility, your costs, and how clean your records stay for tax. The main options each suit different situations.
An equity top-up, or loan increase, adds a separate split to your existing loan to release funds for the deposit and costs.
A cash-out refinance replaces your loan, often with a new lender, and releases equity in the process.
A dedicated loan split keeps the equity release as its own clearly separate portion, which helps keep investment borrowing distinct from your home loan.
A line of credit gives you a flexible facility to draw on, though it usually carries a higher rate and needs discipline to manage.
For most investors, keeping the equity release as a separate, clearly labelled split is the cleanest approach. It avoids mixing your investment borrowing with your owner-occupied debt, which matters for both clarity and tax. The right structure depends on your circumstances, and it is worth setting up properly from the start rather than untangling later.
How lenders assess the extra borrowing
Releasing equity increases your total debt, and lenders assess the whole picture, not just the new loan. Understanding how they look at it helps you judge whether your plan is realistic before you commit to a property.
The serviceability buffer across all loans
The Australian Prudential Regulation Authority (APRA) expects lenders to test your repayments at the actual rate plus a buffer, currently 3 percentage points. This applies to your home loan, the equity release, and the new investment loan together, so your whole debt is stress-tested as though rates were higher. The more you borrow, the more this buffer constrains you.
How rental income is shaded
Lenders typically count only around 80% of the expected rent, holding back the rest for vacancies, management fees, rates, and maintenance. So the income from the investment property helps your case, but not as much as the full rent might suggest, which keeps the assessment conservative.
How existing commitments count
Your other liabilities matter too. Your living expenses, any personal or car loans, a Higher Education Loan Program (HELP) debt, dependants, and even unused credit card limits all reduce your capacity, because lenders assess credit cards on their limit rather than the balance. Tidying these up before you apply can lift what you are able to borrow.
Why equity is not the same as approval
This is the point worth holding onto: having usable equity tells you that you have a deposit, not that you will be approved. The loan still has to service under the buffer on your combined debt. Plenty of homeowners have ample equity but find serviceability is the real ceiling on what they can buy.
Costs to budget for
Using equity to invest brings the usual property purchase costs, plus the ongoing holding costs of being a landlord. Building these in from the start keeps your plan grounded.
Transfer duty, also known as stamp duty, on the investment purchase, which varies by state.
Legal or conveyancing fees and loan setup or valuation costs.
Lenders mortgage insurance, if either property moves above an 80% LVR.
Property management fees, commonly around 7% to 8% of rent if you use an agent.
Landlord and building insurance, council rates, water, and any strata fees.
Repairs, maintenance, and a buffer for periods between tenants.
Loan structure, tax and keeping records clean
How you structure the borrowing has consequences well beyond the rate, particularly for tax, so it is worth getting right at the outset. The guiding principle is to keep your investment borrowing clearly separate from your personal borrowing.
When you release equity to fund an investment, the interest on that portion may be deductible, because the borrowed money is used for investment purposes. Keeping the equity release as its own loan split, rather than blending it into your home loan, makes that purpose clean and easy to demonstrate. Mixing investment and personal borrowing in a single loan can muddy the deductibility and create headaches at tax time.
A note of caution on tying properties together. Cross-collateralisation, where your home and the investment property are both used as security for the loans, can simplify the setup but reduces your flexibility, making it harder to sell or restructure one property without involving the other, and giving the lender more control across both. Many investors prefer to keep securities standalone where possible. How all of this applies to your tax position is a question for a registered tax agent or accountant, who should be part of the plan from the start.
The risks of using equity to invest
Using equity can be a sound way to start investing, but it raises the stakes because you are increasing your debt and, in most cases, borrowing against your own home. Being clear-eyed about the risks is part of doing it well.
Rate rises now affect a larger total debt, so repayments can climb more than you expect.
Vacancies and repairs interrupt rental income while the costs keep running.
A fall in property values reduces your equity and can leave you more exposed, especially if you borrowed close to the limit.
Over-leveraging across two properties leaves little room for the unexpected.
Because your home is involved, financial trouble on the investment can put your family home at risk, particularly if the loans are cross-collateralised.
The way to manage these is not to avoid investing, but to keep a buffer, avoid using every dollar of usable equity, and structure the debt so your home is as protected as it reasonably can be.
Real homeowner scenarios
How using equity plays out depends on your equity, income, and goals. These four situations show the range.
First-time investor using equity
A homeowner with $220,000 in usable equity uses part of it as the deposit and costs on an investment unit, keeping some in reserve as a buffer. They set up the equity release as a separate split for clean records. The deciding factor is not the equity, which is ample, but whether their income services the combined debt under the buffer.
Upgrader keeping the old home
A family upgrading to a larger home decides to keep their current house as an investment rather than sell. They use equity to help fund the new home, convert the old loan to investment terms, and structure the two so the borrowing stays clean. Their capacity depends on how the rent on the retained property is counted alongside both mortgages.
Strong equity but tight cash flow
A homeowner has plenty of usable equity but limited spare cash each month. On paper they can fund a large deposit, but once the combined repayments and a buffer for rate rises are factored in, the serviceability does not stretch as far as the equity suggests. They scale the purchase to what their cash flow genuinely supports.
Homeowner close to 80% LVR
A homeowner still owes close to 80% of their property's value, so their usable equity is small. Releasing equity would push them above 80% and into lenders' mortgage insurance, which changes the maths. For them, waiting to build more equity or saving alongside may be the more sensible path for now.
Common mistakes to avoid
Most regrets with equity-funded investing come from stretching too far or structuring the borrowing poorly. These are the missteps worth guarding against.
Using every dollar of usable equity, leaving no buffer for rate rises, vacancies, or repairs.
Assuming equity guarantees approval, when serviceability is usually the real constraint.
Blending investment borrowing into the home loan, which can complicate tax deductibility.
Cross-collateralising both properties without understanding how it limits flexibility and exposes your home.
Relying on an optimistic valuation, when the lender's figure may come in lower.
Skipping accounting advice and discovering structural problems at tax time.
How a mortgage broker can help
Using equity well is as much about structure as it is about the loan itself, and lender policies on equity release, rental income, and cross-collateralisation vary widely. A broker's role is to match your plan to a lender whose approach suits it, and to set the borrowing up cleanly.
In practice, a broker can calculate your usable equity, model your borrowing capacity across the combined debt, and show you what you can realistically afford once rent is shaded and holding costs are included. They can recommend a structure that keeps your investment borrowing separate and your properties on standalone security where appropriate, compare lenders before you apply to avoid unnecessary credit enquiries, and coordinate with your accountant so the setup supports your tax position. Getting this advice before you make an offer means you buy with a clear plan rather than discovering the limits afterwards.
If you are considering using home equity to buy an investment property, speaking with a mortgage broker in Albury & Wodonga can help you understand how much equity is actually usable before you make an offer. This is especially useful when you need to compare lender policies, model the combined repayments, and structure the borrowing so your investment debt stays clear and manageable.
Frequently Asked Questions (FAQs)
How much equity do I need to buy an investment property?
There is no single figure, but as a guide, your usable equity needs to cover the deposit and purchase costs on the investment, often around 25% of the price if you want to keep both properties at or below an 80% LVR. Usable equity is generally 80% of your home's value minus your current loan, and your serviceability then determines how much you can actually borrow.
Can equity replace a cash deposit, or do I still need savings?
Equity can take the place of a cash deposit, which is what makes it so useful, so you may not need separate savings for the deposit itself. That said, keeping some cash or unused equity as a buffer for rate rises, vacancies, and repairs is sensible, so using every dollar is rarely the wisest approach.
Will I pay lenders mortgage insurance when using equity?
You can avoid it if both your home and the investment property stay at or below an 80% LVR. If releasing equity pushes your home above 80%, or the investment loan exceeds 80% of the new property's value, lenders mortgage insurance generally applies. Knowing your usable equity tells you quickly whether LMI is part of your plan.
Can I use equity without refinancing my whole loan?
Yes. You do not have to refinance everything to access equity. An equity top-up or a separate loan split can release the funds while leaving your existing loan in place, which is often the cleaner approach. Whether to top up or refinance depends on your rate, your lender, and your wider plans.
What is cross-collateralisation?
Cross-collateralisation is when more than one property is used as security for your loans, tying them together under the one lender. It can look simpler, but it reduces your flexibility, making it harder to sell or restructure one property independently, and it exposes your home more directly. Many investors prefer to keep their securities standalone.
Is the interest tax-deductible when I use equity to invest?
The interest on the portion you borrow for investment purposes may be deductible, which is why keeping that borrowing as a clean, separate split matters. Mixing it with personal borrowing can complicate the deduction. How it applies to you depends on your circumstances, so a registered tax agent or accountant is the right person to confirm it.
Should I speak to a broker before making an offer?
It is worth doing. Knowing your usable equity, your borrowing capacity, and the right loan structure before you make an offer means you bid with confidence and avoid surprises. It also lets you set the borrowing up cleanly from the start, rather than reworking it after the purchase.
The Bottom Line
Using the equity in your home can be a practical way to step into property investing without waiting years to save a deposit. The key numbers are your usable equity, generally 80% of your home's value minus your loan, and your serviceability, which decides whether the combined debt is actually approved. Equity gives you the deposit; your income and structure decide the rest.
Before you commit, calculate your usable equity, keep a buffer rather than using all of it, structure the borrowing to keep your investment debt clean and your home protected, and confirm the tax side with an accountant. Approached this way, your equity becomes a considered move toward building wealth rather than a stretch that puts your home at risk.
This article is general information only and does not take your personal, financial, or tax circumstances into account. Using equity to invest involves financial and tax decisions, so consider seeking advice from a licensed mortgage broker, a financial adviser, and a registered tax agent or accountant before acting.