Key Takeaways
- Using equity to buy an investment property starts with 80% of your home’s value less the balance owing, and is capped again by what a lender assesses you can repay.
- A top-up mixes home and investment borrowing in one account, and the Australian Taxation Office requires that mix to be apportioned for the life of the loan.
- A split keeps the investment portion in its own account, so repayments, redraws and records stay separated.
- Cross-collateralising ties both titles to one lender and narrows your options when you sell or refinance.
Take 80% of what the home is worth, subtract the balance still owing, and what is left is the working number. It tells you whether the purchase is possible. It says nothing about how the borrowing should be arranged, and that is where using equity to buy an investment property either stays clean or turns into years of untangling.
The existing home loan is topped up and the extra sits inside it. A new loan is split off and kept separate. Both properties are pledged to the one lender. Or the second loan goes somewhere else entirely. The paperwork looks similar in each case, and the loan amount can be identical.
The difference surfaces at tax time, and again the day you want to sell one of the two properties. Sorting it out before the loan documents are drawn is far easier than restructuring afterwards, which is the conversation worth having with an equity loan broker while the numbers are still on paper.
What Your Usable Equity Actually Funds
Releasing equity does not buy the property. It funds the deposit and the costs that would otherwise come from savings, and a second loan does the rest. Six things set how far a release goes:
The Deposit and Costs Drawn From Your Home
Equity used for an investment deposit generally has to cover the 20% lenders look for, so the new loan sits at 80% of the property’s value. On a $900,000 purchase, that is $180,000 before a single fee is paid.
A release for a Sydney purchase typically needs to cover:
- Deposit, commonly 20% of the purchase price.
- Transfer duty payable to Revenue NSW.
- Conveyancing or solicitor fees.
- Lender application, valuation and settlement fees.
- Building and pest inspection costs.
- Cash buffer for early holding costs.
Amounts differ by lender, by purchase price and by property, so treat this as a general guide.
The Loan Secured Against the New Property
The remaining 80% is borrowed against the investment property itself. It is priced as investment lending, it is secured by the new title alone, and it stands or falls on the rental income and your capacity to service it.
The Release Pushed Beyond 80%
Going past 80% is possible with some lenders, at a price. Moneysmart, run by the Australian Securities and Investments Commission, notes that lenders mortgage insurance (LMI) is usually payable once the amount borrowed exceeds 80% of the property’s value, and that the cover protects the lender, not you or any guarantor. The premium attaches to whichever loan crosses the line, so a release that lifts your home to 88% can trigger a cost on the home side while the investment loan sits comfortably at 80%.
The Limit Set by Repayment Capacity
Valuation sets one ceiling. Servicing sets another, and it usually binds first. The Australian Prudential Regulation Authority (APRA) confirmed on 28 May 2026 that the mortgage serviceability buffer stays at three percentage points, so both loans are assessed at a rate well above the one you will pay. The same update kept debt-to-income limits in place, allowing banks to write up to 20% of new owner-occupied and investment lending at six times income or more, which is where higher earners with existing debt often find the ceiling.
The Evidence Required for Larger Releases
Lenders ask what the money is for, and above an amount each lender sets for itself, they ask for proof. That can mean a contract of sale or a declaration of intended use. A release described loosely may be reduced or declined, and the purpose recorded on the application is worth matching to what actually happens, since the same trail supports your deduction later.
The Equity Left Untouched as a Buffer
A valuation that comes in under expectation, or a soft patch in the local market, can push the combined position close to the lender’s limit and complicate any later application. Many buyers release less than the maximum for that reason, though how much room to leave depends on your income, your holding costs and how long you plan to keep both properties.
How Lenders Structure an Equity Release
What changes between the options is the account the money lands in and the titles the lender holds. Six arrangements are commonly offered:
Absorbing the Release Into the Existing Home Loan
The lender increases the limit on your current home loan and the extra funds are drawn from it. This top-up is the quickest arrangement to put in place and the one most often offered by default. It also means the money that bought your home and the money that bought your investment share a single account for as long as that loan exists.
Splitting the Release Into Its Own Loan
The lender writes the released amount as a separate loan account against the same security. It has its own balance, its own statement and often its own rate and repayment type. The Australian Taxation Office (ATO) describes this structure, referring to two loans managed separately under a facility with sub-accounts while secured by the one property.
Drawing the Release Through a Line of Credit
Some lenders offer the release as a revolving limit you draw down and repay at will. The flexibility that makes it attractive is the same feature that makes the trail hard to follow, since every deposit and withdrawal moves the balance. The ATO points to Taxation Ruling TR 2000/2 for apportioning interest on line of credit and redraw facilities.
Cross-Collateralising Both Properties With One Lender
Here the lender takes both titles as security for both loans. It can remove the need for a formal release, because the equity in your home is already supporting the new borrowing. The loans may still be separate accounts, so the mixing is of security and not of purpose. Cross-collateralisation causes few tax problems and a lot of practical ones.
Refinancing the Home Loan for the Release
Where your current lender caps the release, declines the purpose or prices it poorly, the whole home loan may need to move. That brings a discharge, a fresh valuation and a full credit assessment, and it takes longer than a top-up. It also hands you a clean sheet, since the new loan can be written as separated splits from day one instead of being retrofitted later.
Placing the Second Loan With a Different Lender
The release is done with your existing lender and the purchase loan is written elsewhere. Each property secures its own debt. The cost is two applications, two sets of fees and a settlement timetable that has to line up across two institutions.
Why Separate Loans Matter at Tax Time
Tax treatment does not follow the name on the account. It follows what the borrowed money was used for, and the account structure decides how hard that is to demonstrate and how long any mixing lasts. Eight points decide how cleanly that holds:
Deductibility That Follows Purpose, Not Security
Money released against your home is investment borrowing when it is spent on an investment. The ATO treats the use of the funds as the deciding factor, not the property offered as security. Its example describes a loan secured against a rental property but used to buy a new home, where the interest is not deductible because the new home produces no income.
Repayments That Reduce Both Portions
Once one account holds both private and investment borrowing, the ATO’s guidance on interest expenses states that you cannot repay only the private portion, and that all repayments must be apportioned across both portions for the length of the loan. Every extra dollar you put toward paying off your home also pays down the deductible investment debt in the same ratio. A separate split lets you attack the non-deductible balance on its own.
Redraw That Resets the Deductible Ratio
The ATO gives a worked example of an investor redrawing $9,500 from an investment loan for a television and a lounge suite. The deductible share of that loan drops to 97.4%, and the ATO states the investor must continue apportioning interest and principal repayments at that ratio for the life of the loan. One convenient redraw from the wrong account creates a calculation you carry forward every year afterwards.
Funds That Miss the Purchase
Interest starts on the released amount from the day it is drawn, whether or not it has bought anything. In the ATO’s example, a borrower leaves $70,000 of an investment loan sitting in a savings account for private use, and the interest on that portion is not deductible because those funds are not earning assessable income. Releasing a round number that comfortably covers everything can leave a private tail attached to an investment loan.
Refinancing That Preserves the Original Purpose
Deposits are often paid from a home loan redraw before the investment loan settles, which looks like contamination and usually is not. The ATO describes a deposit funded by redraw from a personal home loan and later repaid out of the investment loan, where the interest remains deductible because funds used to refinance a drawdown take on the character of that drawdown. The sequence has to be documented and the amounts have to match.
Interest That Precedes the First Tenant
Settlement rarely lines up with the first rent payment. The ATO’s condition is that the property is rented or held to produce assessable income, which can extend deductibility to a period before a tenant moves in, depending on what you do with the property and how you hold it out for rent. Vacancy for private use is treated differently.
Ownership That Determines the Deduction Split
Deductions follow legal ownership, not the loan paperwork. The ATO’s examples show joint tenants each claiming half the interest on a jointly held apartment, and a sole owner claiming all of it despite a lender requiring a spouse as co-borrower, supported by a written agreement and bank records showing who paid. Whose name goes on the title is a structure decision made before exchange, not after.
Records That Survive a Later Review
A split produces its own statement showing a single drawdown that went to a single purpose. The ATO requires rental income and expense records to be kept for five years from 31 October, or from the date you lodge if that is later, with purchase and sale records held at least five years after you dispose of the property. Reconstructing a mixed account across that period is the work a split removes.
What Cross-Collateralisation Costs You Later
Tying both titles to one lender rarely bites on the day it is arranged. It shows up in six places:
The Sale That Needs Lender Approval
Selling one of two cross-secured properties requires the lender to release its interest in that title, and it will assess whether the remaining security still supports the remaining debt. Lenders can direct part of the sale proceeds to reduce the other loan as a condition of that release.
The Refinance That Becomes All or Nothing
Moving one loan to another lender usually means moving both, because the security is shared. Better pricing on the investment loan can only be taken up by refinancing the home loan alongside it, with two discharge processes, two applications and fresh valuations on both properties.
The Equity That Disappears Into One Pool
Cross-secured properties are assessed as a combined position. Growth in one property can be absorbed by flat or falling value in the other, and the equity you thought you had built in your home is not readily accessible on its own. Releasing against a single property later becomes an exercise in unwinding the arrangement first.
The Default That Reaches Both Properties
Arrears arising from a long vacancy or a rate rise sit against a security pool that includes the roof over your head. Separate securities do not remove the obligation to repay, though they keep the lender’s recovery rights pointed at the property that caused the problem.
The Unwind That Depends on Servicing
Separating cross-secured loans later is a fresh credit decision, not an administrative request. The lender reassesses both loans on current income, current rates and current valuations, and a position that was approved three years ago may not stand up today.
The Case That Suits Cross-Collateralising
It is the workable option where the deposit and costs cannot be covered without pushing past 80% on one property and LMI would otherwise apply. Treated as a deliberate trade-off with an exit in mind, it can make sense. Accepted by default because the application was easier to submit, it usually does not.
Setting the Structure Before You Buy
Structure is decided in the weeks before you bid, not at settlement. Seven decisions sit in that window:
Valuation Ordered Before Application
The release rests on the lender’s valuation, not a property portal estimate or a neighbour’s sale price. Some lenders accept desktop valuations on established homes while others send a valuer. Valuations on the same property can differ between lenders and between methods, and a low one reshapes everything downstream.
Pre-Approval Held on Both Loans
Two approvals are needed, one for the release and one for the purchase. Approval of the release says nothing about the second loan, since the second is assessed with the first already counted as a commitment. Both are conditional and subject to valuation, credit assessment and the lender’s policy at the time.
Repayment Type Set Per Loan
Splitting allows a different repayment type on each account, which a topped-up single loan does not. Principal and interest on the home portion reduces the non-deductible balance directly. What suits the investment portion depends on your income, your holding costs and your tax position, and principal repayments are not deductible in any case.
Applications Sequenced Across Two Lenders
Where two lenders are involved, the release generally needs to settle first so the deposit funds are available on exchange. Each lender assesses independently and neither waits for the other, so the slower application sets the timetable. Building the sequence backwards from the date you intend to bid is more reliable than lodging both at once.
Auction Timing Matched to Finance
NSW Fair Trading confirms there is no cooling-off period where you buy at auction, or where contracts are exchanged on the same day after a property is passed in. A private treaty purchase carries a five business day cooling-off period, extending to 10 business days for off-the-plan contracts, and withdrawing inside that window costs 0.25% of the purchase price. Settlement usually follows around six weeks after exchange, which sets the window for your second loan.
Security Schedule Checked Before Signing
Loan offer documents name the security property for each loan, and that schedule is where cross-collateralisation appears whether or not anyone used the word. Two loans listing both properties as security make a cross-secured arrangement. Reading that page before signing is the last cheap moment to change it.
Drawdown Timed to Deposit Payment
Funds released weeks early sit in an account costing you money and, depending on where they sit and what else moves through that account, can blur the line between the borrowing and the purchase. Drawing close to when the money is needed keeps both the cost and the record clean.
A Second Property Without Tying Up Your Home
The equity calculation was never the hard part. What you were weighing up is whether buying a second property means your home gets pulled into it, and whether the interest you pay on the investment portion will still be identifiable as investment interest in five years. Both are settled by how the accounts and the security are arranged, and both are far cheaper to arrange correctly than to correct.
Structures that look identical on an approval letter behave very differently once you sell, refinance or lodge a return. Knowing which one you have signed, and why, is the part worth pinning down before the documents are issued.
Where you are working out how to release equity for an investment purchase, the team at DIY Lending can talk you through the options that suit your circumstances.
Frequently Asked Questions (FAQs)
1. Can I use equity in an investment property I already own?
Generally yes, where the lender will accept that property as security and the numbers support it. Release limits, acceptable security types and maximum lending percentages differ between lenders, and investment properties sometimes attract tighter policy than owner-occupied homes.
The purpose of the funds still determines deductibility, and tying a third property into a cross-secured arrangement compounds the same sale and refinance problems.
2. What happens if the valuation comes back lower than I expected?
The release shrinks by the same amount, and the shortfall has to come from somewhere else, usually savings, a smaller purchase or a longer wait. Occasionally the structure changes as a result, since a smaller release can push the new loan above 80% of the purchase price.
A broker with access to more than 40 lenders can look at where a second valuation may be worth ordering before the plan is abandoned, though there is no way to know the outcome in advance.
3. Can I fix the rate on one split and leave the other variable?
With most lenders, yes, since each split is a loan account in its own right. Fixed rates usually limit additional repayments and restrict redraw during the fixed term, which matters if the split you fix is the one you intend to pay down.
4. Does a split loan cost more than topping up my existing loan?
Many lenders create splits within an existing facility without an additional fee, while others charge per account or apply different pricing to each split. The amounts involved are usually modest when set against the effect of apportioned repayments running for the remaining term of a mixed loan.
5. What happens to the structure if I later move into the investment property?
Deductibility follows use, so interest relating to any period the property is used privately is not deductible, even where the loan arrangement stays exactly as it was. The loan does not restructure itself.
A split structure makes that transition easier to account for, because the balances attached to each purpose remain identifiable. A registered tax agent can confirm how the change applies to your return.
This article is general information only and does not take your objectives, financial situation or needs into account. You may wish to speak with a qualified professional, such as a licensed credit representative or a registered tax agent, before acting on anything set out here.