Equity is the difference between what your property is worth and what you owe. Usable equity is a smaller number, and confusing the two is the most common reason an equity release disappoints.
Equity and usable equity are different figures, and both the security test and the income test must pass. How the release is structured decides deductibility later.
There is a second trap. Having usable equity does not mean you can borrow it, because the lender applies a separate income test to the increased loan.
This guide explains both tests, what lenders ask about the purpose of the money, and how to structure the release so interest stays traceable and deductible where it should be.
Total equity is value minus debt. Usable equity is what a lender will actually release, and it is calculated differently.
The standard approach takes eighty per cent of the property’s assessed value, then subtracts the existing loan. The twenty per cent that stays untouched is the buffer that keeps you below the level at which mortgage insurance applies.
| Step | Calculation |
|---|---|
| Property value | As assessed by the lender’s valuer, not by an online estimate |
| Multiply by 80 per cent | This is the lending ceiling without insurance |
| Subtract the current loan balance | What remains is usable equity |
| Subtract costs | Valuation, legal and any lender fees come out of the release |
Two practical points. The valuation is the lender’s, and a result below your expectation reduces the release directly, so an indicative valuation before applying is worth getting. And borrowing above eighty per cent is possible, but mortgage insurance then applies to the increased amount, which frequently outweighs the benefit.
The usable equity calculation australia lenders apply is consistent in method and inconsistent in valuation, which is where the variation between lenders comes from.
Usable equity answers how much security there is. Serviceability answers whether you can afford the larger loan. Both have to pass, and plenty of applications clear the first and fail the second.
This is the point most homeowners find counter-intuitive. The equity is genuinely there, and the lender still says no, because the question was never only about the security.
The mechanism is explained in the serviceability buffer and how borrowing capacity is calculated.
Every equity release requires a stated purpose, and above modest amounts lenders want evidence of it rather than a description.
The reason is responsible lending. A lender has to be satisfied the borrowing suits your circumstances, and that assessment depends on what the money is for.
| Purpose | Lender appetite | Evidence usually wanted |
|---|---|---|
| Renovation | Strong | Quotes or a builder’s contract |
| Deposit for an investment property | Strong | A statement of intent, then the contract |
| Debt consolidation | Moderate | Statements for the debts being cleared |
| Business use | Varies | Often referred to a commercial assessment |
| Investing in shares | Cautious | Detailed questions about suitability |
| Personal spending | Weakest | Harder to support at larger amounts |
Providing cash out purpose evidence up front shortens the process. Being vague invites questions, and questions invite a more conservative assessment.
One caution on debt consolidation. Moving short-term debt onto a thirty-year mortgage lowers the monthly payment and usually increases the total interest paid, unless you keep the repayment at the old level. That is a decision to make deliberately.
How the release is structured decides whether your accountant can cleanly separate deductible from non-deductible interest. Get this wrong once and it persists for the life of the loan.
Before applying. The whole release depends on this number and online estimates are not what the lender uses.
Eighty per cent of value, less the current loan, less costs. Use the borrowing power calculator to sanity check the second test at the same time.
At the buffer rate, with your existing commitments counted. If this fails, the equity is academic.
Quotes, contracts or statements depending on the use. Have them ready at application rather than producing them on request.
This is the critical step. Do not simply increase your existing home loan. Create a distinct loan split for the released amount so the interest on it is separately identifiable.
Deductibility follows the purpose the borrowed money was used for. Mixing an investment deposit into the account carrying your own home debt means apportioning interest every year, permanently. The ATO sets out the principle in its guidance on interest expenses on rental properties.
It seems efficient and it can contaminate the deductibility of the investment portion. Ask your accountant before moving the funds anywhere.
A clean line from the split to the end use is what makes the position defensible years later when nobody remembers the detail.
Illustrative only. Not a client file, not tax advice, and not a quote. Your position depends on the lender’s valuation and your own circumstances.
| Line | Amount |
|---|---|
| Assessed value | $1,300,000 |
| Current loan balance | $520,000 |
| Total equity | $780,000 |
| 80 per cent of value | $1,040,000 |
| Less current loan | $520,000 |
| Usable equity before costs | $520,000 |
| Less valuation, legal and lender fees | Deducted from the release |
| Subject to | Serviceability on the increased loan at the buffer rate |
Total equity is $780,000. Usable equity is $520,000. The $260,000 difference is the buffer the lender keeps, and it is the gap that surprises people who worked from the first number.
Then the second test applies. If the household can service $1,040,000 at the buffer rate the full release is available. If it can service $800,000, the release is capped at $280,000 regardless of the equity sitting in the property.
People arrive with the equity number from a property app and a plan built on it. The first conversation is usually explaining that the lender keeps a fifth of the value back, and the second is whether the income supports the rest.
Paritosh Wadhwani, Director and Principal Broker, APW Finance
Generally eighty per cent of the lender’s assessed value less your current loan balance, with costs coming out of the release. The remaining twenty per cent stays untouched because borrowing above that level triggers mortgage insurance. Total equity and usable equity are different figures, and the gap between them on a Sydney property is often substantial.
Only if you can service the larger loan at the assessment buffer rate with your existing commitments counted. Rising property values increase usable equity without increasing income, so it is entirely possible to have significant equity and still be declined. Both the security test and the serviceability test have to pass independently.
Yes, and above modest amounts you will need to evidence it. Renovation generally requires quotes or a builder’s contract, an investment deposit requires a statement of intent and later the contract, and debt consolidation requires statements for the debts being cleared. Providing the evidence at application rather than on request shortens the process.
It depends entirely on what the borrowed money is used for, not on which property secures the loan. Interest on funds used to buy an income-producing asset is generally deductible, while interest on funds used for personal purposes is not. This is why the release should be taken as a separate split, and why you should confirm your position with your accountant.
It can reduce the monthly payment substantially, but it usually increases the total interest paid because a short-term debt is being stretched over a thirty-year term. If you consolidate, consider keeping your repayment at the previous combined level so the debt still clears quickly. Also address whatever caused the debt, or it rebuilds.
Because interest deductibility follows the purpose the money was used for, and mixing an investment release into the account that carries your own home debt makes the interest impossible to separate cleanly. Your accountant then has to apportion it every year for the life of the loan. A separate split costs nothing extra and avoids that permanently.
Equity releases fail for two reasons. People work from total equity rather than usable equity, and they forget the income test applies to the larger loan.
Get an indicative valuation first, confirm serviceability second, and take the release as its own split so the interest stays traceable.
Read more about equity release, investment lending or refinancing. You can also read using equity to buy an investment or offset compared with redraw.
Ask us what your usable equity really is.
Paritosh Wadhwani | Director and Principal Broker, APW Finance
Member of the Finance Brokers Association of Australia (FBAA). Arranging residential, commercial and specialist lending for Sydney clients across a panel of more than 50 lenders.
APW Finance Pty Ltd, 304/20a Lexington Drive, Bella Vista NSW 2153. Email: info@apwfinance.com. Phone: +61 447 959 546.
ACN 620 646 479 | ABN 79 620 646 479
This guide is general information only. It does not take into account your objectives, financial situation or needs, and it is not financial or credit advice. Lending criteria, interest rates, duty thresholds and government schemes change, and every application is subject to lender approval. Consider whether this information suits your circumstances and seek independent advice before acting. Figures quoted are current at the date below and should be confirmed before you rely on them. Last reviewed: October 2026.
APW Finance Pty Ltd delivers expert lending solutions with personalised service, empowering clients across residential, commercial, and business sectors.