You found a new place. The offer’s accepted, the boxes are mentally already packed — and then a thought lands: what happens to my home loan? You’ve got a rate you’re reasonably happy with, an offset balance you’ve worked hard to build, maybe a fixed term you’re partway through. Does all of that just… disappear when you sell and buy again?
Not necessarily. There’s a feature built into many loans called loan portability, and a lot of borrowers don’t know they have it. It’s one of those quietly useful things that can save you time, paperwork, and in some cases real money — but like most things in finance, whether it suits you depends on your situation.
Here’s how it works, when it’s worth considering, and the trade-offs to weigh before you decide. No pressure, no one-size-fits-all answer — just the full picture, so the call is yours.
What loan portability actually is
Loan portability lets you keep your existing home loan — same loan, same rate, same terms — and move it from the property you’re selling to the property you’re buying. Instead of discharging your old loan and applying for a brand-new one, your lender effectively “substitutes” the security on the loan: the new home replaces the old one as the asset the loan is secured against.
In plain English: the house changes, but the loan stays the same.
That’s the part people miss. You’re not refinancing and you’re not necessarily starting from scratch. If the numbers line up, you can carry your current arrangement across to the new address.
Why it can be appealing
A few reasons borrowers find portability attractive:
- You keep your current rate. If you’re on a rate you’re comfortable with, porting means you don’t have to give it up and re-enter the market.
- You may avoid some fees. Breaking a loan and setting up a new one can trigger discharge fees, application fees, and — if you’re on a fixed rate — potential break costs. Porting can sidestep some of these. (Emphasis on can — fees vary by lender, so this is one to check.)
- Less paperwork and disruption. Substituting security is often a lighter process than a full new application, though it’s not automatic.
- You hold onto your offset or redraw structure. For borrowers who’ve built up an offset balance, keeping the loan intact can be genuinely valuable. (Not sure how much yours is doing for you? Our guide to how offset accounts actually work breaks it down.)
The trade-offs — where portability might not suit
Balance is everything here, so let’s be straight about the catches.
The timing usually has to work. Many lenders require the sale of the old property and the purchase of the new one to settle on the same day — or within a short window. In the real world, that’s not always how moves play out. Some lenders offer more flexibility (a “bridging” arrangement or a short security-substitution period), but you can’t assume it.
The loan amount may need to stay the same. Portability typically moves your existing loan balance. If your new home costs more and you need to borrow extra, that often means a “top-up” — which can be assessed more like a new application, with its own approval requirements.
Your existing rate might not be the best one available. This is the big one. Keeping your current rate feels like a win, but it’s only a win if that rate is still competitive. If you locked it in a while ago, the market may have moved — and porting an uncompetitive rate just carries the uncompetitive rate to a new address. That’s exactly the kind of thing worth checking before you decide.
Lender approval still applies. The new property has to meet the lender’s criteria (valuation, location, type). Porting isn’t a guarantee — it’s a feature, and it’s subject to the lender’s assessment.
A worked example (example only)
The figures below are illustrative and not a quote or a prediction.
Say you have a $480,000 loan on your current home and you’re upgrading to a place that needs a $560,000 loan. Portability could carry the $480,000 across — but the extra $80,000 would generally be treated as additional lending, assessed on its own merits. So in practice you might end up with your original ported loan plus a top-up component, possibly on different terms.
Compare that with simply refinancing the whole $560,000 with a fresh loan, where everything sits under one new arrangement. Which path comes out ahead depends entirely on the rates, the fees, and how the two structures stack up for your circumstances — which is the part no online article can answer for you.
Questions worth asking yourself
- Is my current rate still competitive against what’s available across the market today?
- Will my sale and purchase settle close enough together for porting to be practical?
- Am I borrowing more for the new place — and if so, how would the top-up be treated?
- How do the costs of porting compare with the costs of refinancing?
- Does my offset or loan structure matter enough to want to preserve it?
If you’re not sure how to answer the first one — is my rate still competitive? — that’s actually the easiest place to start.
Your call — and how to make it with the full picture
Loan portability is a genuinely useful feature, but it isn’t automatically the right move just because it exists. The honest answer is: sometimes porting your loan is the smart play, and sometimes you’d be better off comparing the whole market and starting fresh. The only way to know is to look at the actual numbers side by side.
That’s where we come in. As an independent broker working across 50+ lenders, our job isn’t to push you toward porting or refinancing — it’s to lay out what each option looks like for you, so you can decide. We don’t process loans. We unlock options.
Want a quick indication of where your current rate sits before you do anything? Our free Rate Review Tool takes 60 seconds — no login, no personal data. It shows you the gap between your rate and the market, so you’ve got real information before you make a move.
Or, if you’d rather talk it through, a free 15-minute chat with one of our brokers gives you clarity on whether porting or refinancing makes more sense for your move. Your call.
Your Rate, Your Choice, Your Call — That’s Unlocked.
