Using your home's equity to buy an investment property
Your home is probably worth more than you realise. Tapping that equity to fund an investment deposit is the most common path to a second property — and the easiest to get wrong.
If you've owned your home for more than three or four years in most Australian markets, you're sitting on equity you probably haven't fully counted. Using that equity to buy an investment property is the textbook path to a portfolio. But the mechanics matter — there are several ways to do it, and only one or two will be right for you.
Understanding usable equity
Equity is the difference between your property's current market value and your outstanding loan. Usable equity is the portion lenders will let you borrow against, typically 80% of the market value minus your current loan.
Example:
- Home value: $1,200,000
- Current loan: $500,000
- 80% of value: $960,000
- Usable equity: $460,000
That $460,000 can fund deposits on potentially two investment properties.
The two main structures
Option 1: Equity release (top-up). You increase your existing loan, draw the difference, and use the funds toward the investment property deposit and costs. The loan stays with the same lender; the increase is approved like a refinance.
Option 2: Separate loan, separate property. You take out a fresh loan secured against your home for the deposit portion, plus a standalone loan against the investment property for the rest. Two loans, two clean structures.
Why the structure matters
Tax effectiveness is the main reason. Interest on a loan used to acquire an investment property is generally deductible. Interest on a loan used to buy your home is not. Mixing the two in a single loan creates a "contaminated" loan where the deduction calculation gets complicated and audit-prone.
Best practice: keep the loan portions separate even if they're secured against the same property. Most lenders allow a split-loan structure that makes this clean.
Cross-collateralisation: usually a trap
If you stay with one lender for both purchases, they may default to securing both properties against one another. This is called cross-collateralisation. It looks tidy but causes real problems later:
- Selling one property requires the lender's consent and may trigger revaluation of the other.
- Refinancing becomes harder because you have to unwind the cross-secure.
- Your borrowing power can be capped because the lender sees concentration risk.
We avoid cross-collateralisation for investor clients almost without exception.
The order of operations
- Get an independent valuation of your home — not a desktop estimate, an actual market valuation. The difference between an optimistic estimate and the lender's number can be $100k+.
- Confirm usable equity with a broker who can model multiple lenders.
- Structure the investment loan correctly — separate, ideally with a different lender, with interest-only as the typical starting position for tax efficiency.
- Apply for the investment loan before you go to auction, not after.
The equity is already there. The work is in releasing it cleanly, in the right structure, at the right lender.
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