Australia
Most homeowners who want to invest in property assume they need to save a cash deposit from scratch. Many already have the deposit sitting in their home — they just haven't calculated how much of it is accessible.
Usable equity is not the same as total equity. Understanding the difference, and how to structure access to it correctly, is what separates investors who move quickly from those who wait years unnecessarily.
How Usable Equity Is Calculated
Total equity is the difference between your property's current value and your outstanding loan balance. Usable equity is the portion a lender will release while keeping your total borrowing at or below 80% of the property's value.
The formula is straightforward:
Usable equity = (Property value × 80%) − Existing loan balance
- Property value: $1,050,000
- Existing loan balance: $480,000
- Usable equity: ($1,050,000 × 80%) − $480,000 = $840,000 − $480,000 = $360,000
This $360,000 is the maximum that can typically be released without crossing 80% LVR — the threshold above which lenders mortgage insurance applies.
A homeowner who bought ten years ago, paid down the mortgage steadily, and watched the property grow may have more usable equity than they realise.
LVR limits vary by lender and are subject to individual assessment.
The Two Ways to Access Home Equity
There are two common structures for releasing equity. They produce different outcomes for tax deductibility, and choosing the wrong one creates accounting complexity for the life of the loan.
Option 1 — Top-up on your existing home loan
the equity release and the existing home loan are in the same account. Interest on the home loan portion is not tax-deductible (it funded a primary residence). Interest on the equity release portion is deductible (it funded an investment). Mixed in one account, the calculation becomes messy and open to ATO scrutiny.
Option 2 — Standalone equity release loan
A separate loan, secured against your existing home, used solely as the investment deposit. This keeps deductible and non-deductible debt cleanly separated. Your accountant can clearly identify each borrowing's purpose. Interest on the standalone equity loan is fully deductible as investment-related borrowing.
The standalone structure is the recommended approach in almost every case.
Tax treatment varies by individual circumstance — speak with your accountant before making any decisions based on tax considerations.
Talk to Key Choice Lending about your options.
Key Choice Lending has access to 72+ lenders and has supported Australian borrowers through more than $1 billion in transactions. Founder Matthew Clark is a two-time Amazon bestselling author and Better Business Awards Award winner. Book a Strategy Session — no obligation, focused on your situation.
Cross-Collateralisation: The Risk Most Investors Miss
Some lenders offer to secure both the equity release and the investment property loan under a single mortgage, using both properties as combined security. This is called cross-collateralisation — and experienced property investors almost universally avoid it.
When properties are cross-collateralised, the lender holds security over both for both debts. If you want to sell one property, access equity in either, or refinance to a different lender, you need that lender's full cooperation — including a new valuation of both properties. You lose negotiating leverage and operational flexibility.
A clean structure keeps each property as security for its own loan only. Even if this means using two different lenders, the long-term flexibility is worth the slightly more complex setup.
Worked Example: From Equity to Investment Property
Sarah owns a home in Melbourne worth $1,150,000 with a $510,000 mortgage remaining. Her usable equity is $410,000 ($1,150,000 × 80% minus $510,000).
She wants to buy a $790,000 investment property. She needs a 20% deposit ($158,000) plus costs of approximately $40,000 (stamp duty, conveyancing, and building inspection) — $198,000 total.
Sarah takes a standalone equity release loan of $200,000 secured against her Melbourne home. This funds the deposit and purchase costs. She takes a separate investment property loan of $632,000 (80% of $790,000) secured against the investment property only.
Two loans. Two securities. No cross-collateralisation. Clean deductibility. The interest on the $200,000 equity release loan is fully deductible as investment-related borrowing.
The One Step Before You Access Equity
Before releasing equity for investment purposes, have your accountant confirm the structure in writing. The method of access determines whether the interest on the equity loan is tax-deductible. Getting this wrong from the first drawdown is harder to unwind than setting it up correctly at the start.
The 30-second calculation to check your usable equity takes seconds. The conversation with your accountant about the right structure takes an hour. That hour is the most valuable part of the process.
Book a Strategy Session. Make the Move.
The information provided in this blog is for educational purposes only and should not be considered financial advice. Always consult with a professional financial advisor or lender for specific lending decisions.
