If you already own property in Melbourne, you may be sitting on a powerful resource without realising it — the equity built up in your home. Rather than saving for a separate deposit from scratch, many Melbourne homeowners are using their existing home equity to fund the deposit and purchase costs on an investment property, allowing them to enter the market sooner and start building a portfolio.
But how does it actually work? How much equity do you need, and what do lenders look for when you apply? With APRA's new 2026 debt-to-income rules now in effect and interest rates holding at 4.35%, the rules of the game have changed slightly for investors. This guide from Integrated Finance Group breaks it all down clearly so you can make an informed decision.
Key Takeaway: Usable equity = 80% of your property's current value minus your outstanding loan balance. Melbourne homeowners who purchased several years ago may have access to considerably more equity than they realise — and it can be used as the deposit on an investment property without touching your savings.
What Is Usable Equity — and How Much Do You Have?
Equity is simply the difference between what your property is currently worth and what you still owe on your mortgage. But lenders don't let you access all of it. Most will only lend up to 80% of your property's value to avoid triggering Lenders Mortgage Insurance (LMI) on the top-up amount. The amount you can actually borrow against is called your usable equity.
Here's the formula:
| Your Situation | Example A | Example B |
|---|---|---|
| Current property value | $800,000 | $1,050,000 |
| 80% of property value | $640,000 | $840,000 |
| Minus outstanding loan balance | $350,000 | $520,000 |
| Usable equity available | $290,000 | $320,000 |
In Example A, the homeowner has $290,000 in usable equity — potentially enough to fund a 20% deposit on an investment property priced around $600,000 to $650,000, plus stamp duty and purchasing costs. In Example B, $320,000 could cover a deposit on a property up to approximately $700,000 to $750,000.
Keep in mind these are indicative figures only. Your actual borrowing capacity depends on your income, existing debts, the investment property's expected rental income, and how lenders assess your application under APRA's current guidelines.
How Lenders Assess Your Application in 2026
Accessing equity for an investment is not simply a matter of having the numbers stack up on paper. Lenders apply a rigorous serviceability assessment before approving any equity release — and the rules tightened further at the start of 2026.
The 3% Serviceability Buffer
APRA requires lenders to stress-test your repayments at 3 percentage points above your actual loan rate. If your investment loan rate is 6.5%, lenders assess your ability to repay at 9.5%. This is the primary reason borrowing capacity is tighter than the headline rate suggests — you need to demonstrate income that comfortably services both your existing home loan and the new investment loan, even at significantly higher rates.
Every lender also assesses your total debt position relative to your income — the higher your existing debts relative to what you earn, the fewer lenders will be able to approve a new investment loan. This is an area where working with an experienced Melbourne mortgage broker adds significant value — we know which lenders are most investor-friendly right now and can match your situation to the right lender before you even submit an application.
Two Ways to Access Your Equity
There are two main approaches to unlocking equity for an investment property purchase. The right option depends on your existing loan structure, your lender, and your longer-term portfolio plans.
Option 1: Refinance to a New Lender and Top Up
You refinance your existing home loan to a new lender, borrow the additional equity amount as a separate loan split, and then use those funds as the deposit and costs for the investment property. The investment property then has its own separate investment loan with the same or a different lender.
This approach works well if your current lender is uncompetitive on rate or restrictive on investor lending, or if you want to consolidate your borrowing under a more flexible lender.
Option 2: Top Up With Your Existing Lender
If your current lender offers good rates and is happy to lend to investors, you can apply for an equity release (sometimes called a "top up" or "loan increase") directly. This avoids the cost and process of refinancing but may limit your options if your lender's investor rates are not competitive.
In either case, we recommend structuring the equity release and the investment loan as separate, standalone loan facilities rather than cross-collateralising both properties under a single loan. See below for why this matters.
Why You Should Avoid Cross-Collateralisation
Cross-collateralisation is when a lender uses both your home and your investment property as joint security across a single loan or group of loans. Banks often prefer this structure — it gives them more control over your assets. But for the borrower, it creates significant long-term problems:
- Reduced flexibility: If you want to sell one property, your lender must revalue and reassess both, which can delay settlement and complicate negotiations.
- Equity access restrictions: If the properties are crossed, your equity is pooled across them — making it much harder to draw equity from one property to fund a third purchase.
- Lender dependency: You're locked to one lender for both properties, reducing your ability to switch to a better deal if rates move.
- Complication on sale: Lenders decide how sale proceeds are allocated across your loans — not you.
The cleaner structure: keep your home loan as Loan 1, access your equity as Loan 2 (separate split or sub-account), and take out the investment property loan as Loan 3 — ideally secured only against the investment property, once you have sufficient equity and deposit.
What About Rental Income — Does It Help Serviceability?
Yes — most lenders will include a portion of projected rental income in their serviceability assessment, which helps your borrowing capacity. The proportion varies by lender, but typically ranges from 70% to 80% of the gross weekly rent (the discount accounts for vacancy, maintenance, and property management costs).
This means that a well-chosen investment property — one that returns strong rental income relative to its price — can meaningfully improve your ability to qualify for the investment loan. Melbourne's gross dwelling yield is currently around 3.9%, with units in high-demand areas consistently outperforming this benchmark.
If you're considering buying through your SMSF, different rules apply — see our dedicated guide to SMSF property lending in Melbourne.
Tax Considerations: What to Discuss With Your Accountant
Using equity to purchase an investment property has tax implications that are outside the scope of this article — you must speak to a qualified accountant before proceeding. Key areas to discuss include:
- Interest deductibility: The interest on the equity loan used to fund the investment property deposit is generally tax-deductible, but the interest on your home loan is not. Your accountant can help structure this correctly and ensure the purpose of each loan is properly documented.
- Negative gearing: If your investment property generates a tax loss (expenses exceed rental income), you may be able to offset this against your other income. Note that negative gearing rules were subject to proposed changes in the 2026 Federal Budget — speak to your accountant for the latest status.
- Capital gains tax (CGT): The 50% CGT discount applies to investment properties held for more than 12 months. Budget 2026 also proposed changes here — your accountant will have the current confirmed position.
- Depreciation: A tax depreciation schedule (from a quantity surveyor) can generate additional deductions on the building and fixtures.
Steps to Take If You're Ready to Explore This Strategy
- Get your home valued: An up-to-date property valuation gives you an accurate usable equity figure. Your broker can often arrange a free desktop valuation through their lender panel.
- Check your income position: Calculate your current DTI ratio and understand where you sit relative to the 6x threshold. Your broker will do this as part of a borrowing capacity assessment.
- Get pre-approval: Before you start searching for an investment property, confirm your borrowing capacity. Pre-approval means you can move quickly when the right property comes up — particularly important in Melbourne's competitive auction market.
- Choose the right structure: Your broker will help you decide between refinancing and topping up, and will recommend a standalone loan structure to protect your future flexibility.
- Engage your accountant: Before settlement, confirm with your accountant how the equity and investment loans should be structured and documented for tax purposes.
If you're already investing and want to explore how Melbourne's northwest — including Essendon, Moonee Ponds and Keilor — is performing for investors right now, see our Melbourne northwest investment property guide. And if you're unsure whether refinancing first makes sense before accessing equity, that's a conversation we're happy to have with you.
Want to Know How Much Equity You Can Access?
Our Melbourne mortgage brokers can run a free borrowing capacity assessment — we'll calculate your usable equity, check your DTI position under the 2026 APRA rules, and recommend the right loan structure for your investment goals. No obligation.
Book a free consultation or call 0401 333 636
Credit services provided by Integrated Finance Group, Credit Representatives of BLSSA Pty Ltd ACL 391237. MFAA members: Brian #716100 · Frank #242075.