An offset account is one of those mortgage features that’s supposed to just quietly do its job in the background. Keep money in it, and the bank reduces the interest calculated on the equivalent portion of your loan. That’s the whole appeal – set it up once, and let it work for you.
Except a review released by ASIC in late July has shown that, for a meaningful number of borrowers, it isn’t quite that simple.
ASIC reviewed eight banks covering more than 70% of Australia’s home loan market – genuinely widespread, not a niche issue – and found weaknesses in how every single one of them set up, monitored and managed offset accounts. Between September 2023 and August 2025, those banks paid out more than $55 million in compensation to affected customers, and ASIC has said further compensation is expected as banks keep working through the scale of the problem.
Why This Is So Easy to Miss
Here’s the frustrating part: an offset failure doesn’t announce itself. Your repayment amount stays exactly the same each month. Your statement still looks perfectly normal at a glance. So what’s actually going wrong?
Every repayment you make is split into two parts: some covers interest, the rest reduces what you actually owe. An offset account works by lowering the balance your interest gets calculated on in the first place.
Here’s the actual maths: say you’ve got a $750,000 loan and $50,000 sitting in a linked offset account. The bank subtracts your offset balance from your loan balance, then only charges interest on the difference – $700,000, not $750,000. That $50,000 gap is where your savings come from.
If the link breaks, that subtraction stops happening. The bank goes back to charging interest on the full $750,000, even though your $50,000 is still sitting in the offset account, untouched.
To put that in real numbers: ASIC’s review shows a borrower in exactly that position – a $750,000 loan, $50,000 unlinked from the offset – would pay more than $3,000 in extra interest in the first year alone, money that should have been reducing their loan instead. Left unfixed for the life of the loan, that gap compounds to almost $230,000 in lost interest savings, and roughly four extra years spent paying off a mortgage that should already be cleared.
What Actually Went Wrong
So how does an offset account end up broken in the first place? ASIC’s review found the single biggest culprit, accounting for more than half of all cases, was an account that had been opened but never actually linked to the home loan. Other failures involved accounts that weren’t opened at all despite being requested, or accounts linked well outside the timeframe customers were told to expect.
In most cases, the root cause came down to manual processing errors – particularly around refinancing or loan changes, when the handover between systems and staff creates exactly the kind of gap where something can slip through unnoticed. No grand conspiracy, just ordinary admin slipping through the cracks at scale.
What to Check on Your Own Loan
The good news is this takes a few minutes, not a financial review:
- Confirm the link. Log into your banking app or check a recent statement to verify your offset account is actually linked to your specific home loan – not just that you’ve got an account with the same bank.
- Look for the interest savings. Your bank should be able to show you how much interest your offset balance has saved you. If you genuinely can’t find that figure anywhere in your app or statements, that’s worth asking about directly.
- Double-check after any loan change. Refinancing, switching products, or restructuring your loan is exactly when these links tend to break. Make it a habit to check every time your loan structure changes, not just once.
- Don’t sit on a doubt. If something looks off, raise it with your bank sooner rather than later – plenty of banks were slow to act until someone flagged it.
Key Takeaways
- ASIC found weaknesses in offset account management across all eight banks it reviewed, covering more than 70% of the home loan market.
- Banks paid out over $55 million in compensation for offset failures between September 2023 and August 2025, with more expected.
- Most failures trace back to manual errors, especially around linking accounts or handling loan changes.
- The only reliable way to know your offset is working is to check it directly – your repayment amount won’t tell you.
If you’re not sure how your offset should be working, or you’d just like a second set of eyes on your loan structure, that’s exactly the kind of thing we can work through together. We’re based in Richmond, Melbourne, but we help borrowers right across Australia. Get in touch and we’ll take a look at your loan.
