Yes. If your loan is in good standing and the borrower names stay the same, you can usually keep your existing home loan and simply substitute the property securing it. This is called security substitution, a security swap, or loan portability, and it means you skip the paperwork, valuation costs, and possible break fees that come with refinancing.
Before you get excited, check these three things:
- Are the borrower names on your new purchase identical to your current loan?
- Is your loan account in good standing, with no arrears?
- Are you borrowing the same amount or less (not upsizing)?
Pro Tip: Pull out your loan contract or product disclosure statement and search for "portability" or "substitution of security" before you call your lender. Knowing the exact clause name saves you a runaround with the call centre.
Key Takeaways
Security substitution lets eligible borrowers keep their existing loan rate and features by swapping the property securing it, avoiding refinancing costs and fixed-rate break fees.
| Point | Details |
|---|---|
| Check eligibility first | Same borrower names, no arrears, and no increase in loan amount are the core filters lenders apply. |
| Same-day settlement is simplest | Coordinating both settlements on one day avoids the need for temporary security arrangements. |
| Term deposits bridge gaps | Lenders may hold sale proceeds as temporary security for a limited period, conditions apply. |
| Fees are usually lower than refinancing | Expect valuation, registration, and possible portability fees, but no fixed-rate break costs. |
| Get broker support early | ZENRG Finance coordinates valuations, solicitor liaison, and lender submissions to keep your swap on schedule. |
This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.
Table of Contents
- What is security substitution (loan portability) in Australia?
- Am I eligible? Lender restrictions to check first
- How does the settlement timing actually work?
- What does substitution cost, and what happens to your loan features?
- What documents and steps does the process involve?
- When is security substitution not an option?
- A broker's practical checklist for a smoother swap
- Sources
What is security substitution (loan portability) in Australia?
Security substitution is when you ask your lender to swap the property securing your existing home loan without opening a new loan. It's the same request whether your lender calls it a "security swap," "substitution of security," or "portability" (the terms are used interchangeably across Australian banks).
What changes: the physical property standing behind your mortgage. What stays the same: your interest rate, your loan account number, your existing features, and in most cases your offset or redraw arrangements, according to Macquarie's help centre. You'll typically find the relevant clause under "changes to your home loan" or "portability" in your loan contract or product disclosure statement, not in the general terms and conditions.
Am I eligible? Lender restrictions to check first
Most lenders apply a consistent set of filters before approving a substitution request. Run through these before you contact anyone:
- Same borrower names. You generally can't add or remove a person from the loan as part of a substitution. That needs a separate application.
- Loan type matters. Construction loans, certain fixed products, and loans on specific BSB ranges may be excluded, as Macquarie notes for some of its own products.
- Good standing required. Loans in arrears are almost always declined for substitution until the account is brought current.
- LVR and valuation. The new property needs a valuation, and your loan-to-value ratio must sit within the lender's policy.
- No borrowing increase. You can't use substitution to top up your loan. ANZ and Macquarie both confirm a swap won't stretch to cover extra funds without a separate approval process.
How does the settlement timing actually work?
Timing is where most of the stress in a property swap lives, and lenders offer a few different pathways depending on how your sale and purchase line up.
Same-day settlement is the cleanest option. Your solicitor or conveyancer coordinates both settlements to happen on the same day, so the lender releases the old title and registers the new one almost simultaneously. This avoids any gap in security altogether.
Deferred settlement using a term deposit covers you when your sale settles before your purchase. Lenders will often accept the sale proceeds held in a term deposit as temporary security, commonly for up to three to six months depending on the lender's policy, according to St.George. Ask for the exact maximum period in writing, because this varies more than most borrowers expect.
Buy first, then sell suits people who find their next home before their current one is under contract. This usually means a bridging or relocation loan, carrying two properties (and sometimes two sets of repayments) until the sale settles, at which point substitution completes the process; learn how specialised commercial finance services can support such complex lending scenarios.
- Book your valuer and solicitor early, especially if you're chasing a same-day settlement.
- Confirm your lender's maximum holding period for term-deposit security before you sign a deferred settlement contract.
- Ask whether bridging finance is arranged through the same lender or requires a separate facility.
What does substitution cost, and what happens to your loan features?
Substitution is generally cheaper than refinancing, but it isn't free. Expect some combination of a portability or administration fee (some lenders charge one, some don't, per St.George), a valuation fee for the new property, mortgage registration or transfer costs, and your solicitor or conveyancer's fee.
The bigger financial win is on your loan features. Because you're keeping the same facility rather than closing it, you avoid fixed-rate break costs entirely, a real saving if you're locked into a competitive rate. ANZ confirms your balance, rate, and most features carry across unchanged.
Two things can push costs up:
- If your new property's LVR is higher than your old one, you may trigger Lenders Mortgage Insurance, even if you didn't pay it originally.
- If you're using bridging finance while you wait to sell, you'll wear dual interest costs until settlement, which adds up faster than most borrowers budget for.
What documents and steps does the process involve?
Substitution applications follow a fairly consistent shape across lenders, even if the exact forms differ.
- Gather your paperwork first: contracts of sale for both the property you're selling and the one you're buying, current title details, photo ID, and confirmation of your settlement dates.
- Submit your request: most lenders want this via a specific form or dedicated email address. Macquarie, for example, has a specific submission process and flags that some products or BSB ranges aren't eligible.
- Valuation and credit assessment: the lender orders a valuation on the new property and runs a fresh credit check, even though your loan already exists.
- Sign the variation documents: once approved, you'll receive updated mortgage documents to sign, which your solicitor typically handles alongside the settlement paperwork.
- Settlement day coordination: your solicitor liaises with the lender to make sure the security swap is registered at the same time your purchase settles.
Pro Tip: Ask your broker to submit the substitution request the moment you exchange contracts on your sale, not after. Valuation and credit assessment windows can run for weeks, and starting early gives your solicitor room to move if anything gets delayed.
When is security substitution not an option?
Substitution isn't always available, and knowing the blockers early saves you a wasted application.
- Upsizing. If your new property needs a bigger loan, a straight swap generally won't work. You'll need a top-up approved first or a fresh loan altogether.
- Changing borrowers, construction loans, or arrears. Any of these usually rules out a standard substitution.
- Valuation shortfalls. If the new property values in lower than expected, you may need extra deposit funds or face LMI, a common reason applications get delayed or declined.
- Long settlement gaps. If the gap between your sale and purchase exceeds your lender's term-deposit holding limit, you'll need bridging finance instead.
A broker's practical checklist for a smoother swap
A good broker earns their keep in the weeks before settlement, not after something goes wrong. Here's what that looks like in practice:
- Start the conversation with your lender or broker as soon as you list your property, not after you've found your next one.
- Ask your lender directly for the exact maximum term they'll hold sale proceeds as security, in writing.
- Let your broker coordinate valuer bookings and solicitor contact so nothing falls through the gaps between parties.
- If your numbers don't fit a swap (you're upsizing or your loan type is excluded), a fresh comparison against refinancing usually makes more sense than forcing a substitution that isn't suited to your situation.
Why early planning with a broker matters
Every delay in this process comes from something that should have been sorted weeks earlier: a valuation booked too late, a form submitted the day before settlement. Getting a broker involved early protects your rate and your sanity. If you're not sure where to start, ZENRG Finance's team can walk you through it.
— Allen
How ZENRG Finance keeps your substitution on track
ZENRG Finance exists for exactly this moment. You get one person coordinating your valuation, your solicitor, and your lender, instead of chasing three separate parties yourself while trying to settle two properties at once.
Our mortgage relationship managers handle the parts that usually go wrong: booking valuations early enough to avoid settlement clashes, liaising directly with your solicitor on variation documents, and setting up bridging arrangements if your sale and purchase don't line up neatly. If your situation turns out to need a fresh loan rather than a swap, whether you're upsizing or your current lender excludes your loan type, we'll walk you through the refinancing eligibility criteria as well, so you're not stuck guessing which path fits.
Property investors juggling multiple settlements often find this coordination even more valuable, particularly when timing across several properties gets tight, a scenario our property investment specialists handle regularly.
Ready to find out if substitution suits your sale and purchase? Book a session with our mortgage relationship manager and get your timeline sorted before you exchange contracts.
Sources
- Substituting the security of your home loan | Macquarie Help
- Substitution Of Security | St.George Bank
- New home, same loan – the security swap option | ANZ