Usable Home Equity Calculator
Work out how much of your home equity a lender will actually let you use, and what that funds as the deposit on your next investment property. Banks frame equity as room to borrow more. For an investor, it is the deposit on the next purchase.
Where your property value sits
| Property value | $950,000 | |
| × | Lender LVR cap (80%) | $760,000 |
| − | Current loan balance | $520,000 |
| = | Usable equity | $240,000 |
| ÷ | 25% (20% deposit + ~5% purchase costs) | $960,000 purchase budget |
Know your usable equity. Not sure what to buy with it?
That is the part we do all day. We find investment-grade properties, many off-market, negotiate the price, and stay involved after settlement. Flat fee, no commissions from anyone.
Book a Free Discovery CallHow usable equity works
Equity is the share of your property you actually own: the current value minus what you owe. But lenders will not let you borrow against all of it. Almost every lender caps total lending against a residential property at 80% of its value before lenders mortgage insurance kicks in. The last 20% stays locked as the bank's buffer against a price fall and the costs of a forced sale.
That cap is where usable equity comes from. The formula is short:
Usable equity = (property value × lender LVR cap) − current loan balance
On a $950,000 home with $520,000 owing, an 80% cap allows $760,000 of total lending. You already owe $520,000, so the difference, $240,000, is the equity you can actually put to work. The bank's valuation drives the number, and bank valuations run conservative. If your figure depends on an optimistic agent appraisal, expect the usable amount to come in lower.
Usable equity vs total equity: the mistake everyone makes
The same $950,000 home has $430,000 of total equity. It has $240,000 of usable equity. Those are very different numbers, and plans built on the wrong one fall over at the bank.
Total equity is what you see in casual conversation: "the house is worth $950k and we owe $520k, so we're sitting on $430k." True, but $190,000 of it is locked behind the 80% cap. You only reach it by selling the property, or by paying LMI to push past 80%. When you are working out what you can buy next, the usable figure is the only one that matters.
The gap gets bigger the higher your existing loan sits. A home at 75% LVR has plenty of total equity on paper and almost nothing usable. This is why paying the loan down (or letting the value grow) quietly builds your next deposit even when nothing looks like it is happening.
The four ways to access it
Once you know the number, there are four common structures for getting the money out:
- Loan top-up. Your existing lender increases your current loan to release the equity. Simple and cheap, but it mixes the investment borrowing into your home loan unless the lender splits it, which muddies the interest deduction at tax time.
- Supplementary loan or split. A new, separate loan account secured against your home, used only for the investment purchase. This is the clean structure: the investment debt is separately identifiable, so the interest is clearly deductible, and your home loan stays untouched.
- Refinance. Move the whole loan to a new lender and borrow more in the process. Worth it when your current lender's valuation or rate is the problem, but factor in discharge and setup costs, and a full new application.
- Cross-collateralisation. One loan secured by both your home and the new investment property. Avoid this one.
From equity to deposit: the worked example
The prefilled numbers in the calculator are a common position for an Australian homeowner five to ten years into a mortgage:
| Step | Amount |
|---|---|
| Home value | $950,000 |
| Loan balance | $520,000 |
| Total equity | $430,000 |
| Maximum lending at 80% LVR ($950,000 × 0.80) | $760,000 |
| Usable equity ($760,000 − $520,000) | $240,000 |
| Purchase budget at 20% deposit + 5% costs ($240,000 ÷ 0.25) | $960,000 |
Why divide by 0.25? Every dollar of investment property needs about 25 cents of your own money: 20 cents of deposit to stay under the 80% cap on the new loan, and roughly 5 cents for stamp duty, legals, and inspections (it varies by state; check the stamp duty calculator for yours). $240,000 of usable equity covers 25% of roughly $960,000 of property.
In practice that could be one $900,000 house with margin to spare, or two properties around $450,000 to $500,000 in different cities. The two-property route diversifies your market risk and often rents better per dollar. That decision is a strategy question, not a maths question, and it is exactly what a buyers agent engagement works through.
What lenders actually assess
An equity release application gets tested on two independent fronts, and you need to pass both:
- The security side (LVR). This is what the calculator models. The lender values your property, applies its LVR cap, and subtracts your debt. The value of the asset sets the ceiling.
- The income side (serviceability). The lender adds the proposed new debt to everything you already owe and tests whether your income covers repayments at your actual rate plus a 3 percentage point buffer, the assessment floor APRA requires of Australian lenders. Around a 6% actual rate, that means being assessed as if you were paying about 9%. Rental income from the new property counts, but lenders typically shade it to about 80% to allow for vacancy.
- Debt-to-income. Most lenders also look at total debt against gross household income. Ratios above about six times income face extra scrutiny at many banks, and some cap lending at that line regardless of equity.
Plenty of homeowners have six figures of usable equity and fail serviceability; plenty of high earners pass serviceability with no equity to deploy. You need both, which is why the honest description of this calculator's output is "the most the value side will allow."
Costs and risks worth naming
- LMI above 80%. Push the release or the new purchase loan past 80% LVR and lenders mortgage insurance applies. It can run from a few thousand dollars to tens of thousands, it protects the lender rather than you, and it is usually capitalised onto the loan where it accrues interest for decades.
- Your home is on the line. The released equity is a loan secured by your home. If the investment fails and you cannot service the debt, the security the bank moves on is the house you live in. This is also the core reason to avoid cross-collateralisation: keep the failure modes separated.
- Rate rises hit twice. After an equity release you carry more debt on the home plus the new investment loan. A 1% rate rise on $700,000 of combined new debt is about $7,000 a year before tax. Stress-test the position with the cash flow calculator at a rate 2% above today's.
- Valuation risk. The bank's valuation can land under your expectation and shrink the usable figure overnight. Get the valuation done before you commit to anything unconditional.
- Loan structure at tax time. Interest is deductible based on what the borrowed money was used for, not which property secures it. Blend the equity release into your home loan redraw and you create an apportionment headache. Keep the investment borrowing in its own split.
Frequently asked questions
Multiply your property's current value by your lender's maximum LVR (most lenders cap at 80% without lenders mortgage insurance), then subtract your current loan balance. Example: a $950,000 home with $520,000 owing gives $950,000 x 0.80 = $760,000 of maximum secured lending, minus $520,000 = $240,000 of usable equity. Your total equity is $430,000, but the bank keeps the last 20% of the property value as its buffer.
Total equity is your property's value minus what you owe on it. Usable equity is the portion a lender will actually let you borrow against, normally capped so that total lending stays at or below 80% of the property value. On a $950,000 home with $520,000 owing, total equity is $430,000 but usable equity at 80% LVR is only $240,000. Plans built on the total figure fall over at the bank.
Budget around 25% of the purchase price: 20% for the deposit plus roughly 5% for stamp duty, legal fees, and other purchase costs. For a $600,000 investment property that is about $150,000 of usable equity. A 10% deposit needs less equity but adds lenders mortgage insurance to the loan.
Four main structures: a top-up on your existing home loan, a supplementary loan or split against the same property, a full refinance to a new lender, or cross-collateralisation where both properties secure one loan facility. Most investors are best served by a separate split or supplementary loan, which keeps the investment borrowing cleanly separated for tax purposes. Cross-collateralisation ties both properties to the same lender and is best avoided. Our home equity guide walks through each structure.
Cross-collateralisation is when one loan is secured by two or more properties, typically your home plus the investment property. It gives the lender security over both assets, makes it harder to sell one property without the bank revaluing the whole position, and reduces your flexibility to move lenders or release equity later. A separate equity split against your home plus a stand-alone loan for the investment property achieves the same purchase without tying the properties together.
No. Usable equity is only the ceiling set by the value of your property. The bank also has to pass your income through a serviceability assessment. APRA requires lenders to test your repayments at your actual interest rate plus a 3 percentage point buffer, and your income, expenses, and existing debts decide the outcome. Treat usable equity as the upper bound, not a pre-approval.
Some lenders allow equity release up to 90% LVR, but lending above 80% normally triggers lenders mortgage insurance (LMI). LMI can run from a few thousand dollars to tens of thousands depending on the loan size and LVR, and it protects the lender, not you. Going above 80% also thins out the buffer protecting you from a market dip.
Not necessarily for the purchase itself. An equity release can cover the full deposit and purchase costs, so investors regularly buy with no cash contribution. You should still hold a cash buffer for vacancies, repairs, and rate rises. Most lenders also want to see clean account conduct and enough income to service both loans.