ASIC's Mortgage Offset Account Warning: What Australian Homeowners Need to Know in 2026

Quick answer: ASIC has identified widespread failures in how lenders apply mortgage offset accounts, meaning thousands of Australian borrowers may be paying more interest than they should. Check your loan statements, confirm your offset is correctly linked, and understand exactly how your lender calculates the benefit.

Australia's financial regulator has put lenders on notice over a problem that's been quietly draining money from homeowners' pockets: mortgage offset accounts that don't work the way borrowers think they do. The Australian Securities and Investments Commission (ASIC) has flagged that failures in how offset accounts are set up, linked, and calculated are costing Australians millions of dollars in interest savings they were entitled to. If you have a home loan with an offset facility, this is one of the most important things you can check right now.

What Is a Mortgage Offset Account, and Why Does It Matter?

A mortgage offset account is a transaction or savings account linked to your home loan. The balance in that account is "offset" against your outstanding loan balance for the purpose of calculating daily interest. You don't earn interest on the offset account itself — instead, you pay less interest on your mortgage.

Here's a simple example: if you owe $500,000 on your mortgage and you have $30,000 sitting in your offset account, you only pay interest on $470,000. Over the life of a loan, even a modest offset balance can save tens of thousands of dollars and shave years off your repayment term.

How the interest saving actually works

Home loan interest in Australia is typically calculated daily and charged monthly. The daily interest formula is:

Daily interest = (Loan balance − Offset balance) × Annual interest rate ÷ 365

Using our example above, at a rate of 6.20% p.a.:

Scenario	Balance Interest Is Charged On	Daily Interest	Annual Interest
No offset account	$500,000	$84.93	$31,000
$30,000 in offset	$470,000	$79.84	$29,132
Saving	—	$5.09/day	$1,858

That's nearly $1,858 saved in a single year just by parking $30,000 in an offset account — and that's on the conservative end. Over a 25-year loan, the compounding effect of that saving is dramatically larger, potentially shaving two to four years off your mortgage and saving well over $50,000.

Use the Mortgage Calculator to model how your own offset balance affects your total loan cost and repayment timeline.

What ASIC Found: The Key Failures

ASIC's review identified several categories of failure that are preventing borrowers from receiving the full benefit of their offset accounts. These aren't edge cases — the regulator found the problems occurring across multiple lenders, suggesting systemic issues rather than isolated errors.

1. Offset accounts not correctly linked to the loan

In some cases, borrowers opened an offset account and deposited funds, believing their mortgage interest was being reduced. In practice, the account was never properly linked to the loan in the lender's system. The money sat there earning nothing (since offset accounts don't pay interest), while the full mortgage balance kept accruing interest at the standard rate.

This is arguably the most damaging failure because it's completely invisible on the surface. Your account balance looks fine. Your repayments continue. You have no reason to suspect anything is wrong — unless you dig into the detail.

2. Incorrect daily balance calculations

Some lenders were not applying the offset balance correctly in their daily interest calculations. This might involve using yesterday's balance rather than today's, rounding errors that consistently favour the bank, or delays in reflecting deposits and withdrawals. Over months and years, systematic miscalculation accumulates into significant overcharging.

3. Package fee structures eating the benefit

Many lenders offer offset accounts only as part of a home loan "package" — a bundled product that includes the offset facility, a credit card, and discounted rates in exchange for an annual fee (commonly $300 to $400 per year). ASIC found cases where the annual package fee was not being adequately offset by the interest savings delivered, meaning some borrowers were effectively paying for a benefit they weren't fully receiving.

4. Partial offset accounts

Not all offset accounts work the same way. Some lenders offer a "100% offset," where every dollar in the account reduces the loan balance dollar-for-dollar. Others offer a "partial offset" — say, 40% or 50% — meaning only a fraction of your balance is used in the calculation. ASIC found evidence that borrowers were often not clearly told they had a partial offset product, or were switched from a 100% offset to a partial offset without adequate notice.

Important: If your lender's product disclosure statement (PDS) says "partial offset," you need to factor this into your calculations. A $30,000 balance in a 50% partial offset account reduces your effective loan balance by only $15,000, not $30,000.

5. Offset not applying during fixed-rate periods

Many borrowers split their home loan into a fixed-rate portion and a variable-rate portion. Offset accounts generally only apply to the variable portion. ASIC found some borrowers were not clearly informed of this limitation, leading to misplaced expectations about their interest savings. Worse, some lenders were charging for an offset account that technically applied to zero of the loan balance during a fixed period.

The Scale of the Problem

ASIC's findings pointed to millions of dollars in lost savings across Australia's borrower population. When you consider that Australia has approximately 6 million mortgages outstanding and that offset accounts are one of the most common loan features promoted by banks, even a small per-account discrepancy scales up quickly.

For context, if just 200,000 affected borrowers lost an average of $500 per year due to offset failures, that's $100 million annually flowing to lenders that should have stayed with borrowers. The actual figure ASIC assessed is likely higher, given the regulator described the losses as running into "millions" without providing a precise tally at the time of its initial announcement.

Lenders found to have underpaid savings will likely be required to remediate affected customers — but remediation programmes are typically slow, and not every affected borrower will be identified automatically. The onus is partly on you to check.

How to Check Whether Your Offset Account Is Working Properly

You don't need to wait for your lender to contact you. Here's a practical checklist you can run through right now.

Step 1: Confirm the account is actually linked

Log into your online banking and look at your home loan account. There should be a clear indicator showing which offset account is linked to your mortgage. If you can't find this, call your lender and ask them to confirm in writing which account number is linked to which loan account number, and the effective date from which the offset began applying.

Step 2: Run the maths yourself

Get your most recent monthly statement and find:

The loan balance at the start of the month
Your average offset account balance for the month
The total interest charged

Then calculate what the interest should have been using the formula above. Your lender's stated interest rate is in the loan contract or on their website. If there's a meaningful discrepancy — say, more than a few dollars — ask your lender for a detailed daily interest calculation.

Step 3: Check whether you have 100% or partial offset

Read the product disclosure statement (PDS) for your home loan package. Search for the word "offset" and look for whether it says "100%" or specifies any limitation. If you're not sure, call the lender and get the answer in writing.

Step 4: Check the offset applies to the correct portion

If you have a split loan (part fixed, part variable), confirm which portion the offset is applied to and whether there were any periods where it applied to nothing.

Step 5: Review annual fees against benefit received

Add up all the fees associated with your home loan package — annual package fees, offset account fees, any monthly account-keeping charges. Then calculate your actual annual interest saving from the offset (Step 2). If the fees are close to or exceed your savings, the product may not be delivering value.

What to Do If You Think You've Been Affected

If your own calculations suggest your offset hasn't been applied correctly, take these steps:

Document everything. Gather statements going back as far as possible. Calculate the discrepancy month by month if you can.
Lodge a formal complaint with your lender. Use their official complaints process — this creates a record and triggers a formal response timeline. Under the Australian Financial Complaints Authority (AFCA) rules, lenders have 30 days to respond to a complaint (or 45 days for complex matters).
Escalate to AFCA if unsatisfied. If your lender doesn't resolve the complaint satisfactorily, you can escalate to AFCA at no cost to you. AFCA can order lenders to pay compensation, including for losses caused by systematic errors.
Report to ASIC. If you believe there is a broader systemic problem with how your lender is handling offset accounts, you can report it to ASIC directly at asic.gov.au. Reports from consumers form part of the evidence base regulators use to take action.

Maximising Your Offset Account: Getting the Most From What You Have

Assuming your offset is working correctly, here are practical strategies to maximise its benefit.

Park your salary in the offset, not a savings account

Many people keep their everyday money in a transaction account and put "spare" cash in a savings account. If you have an offset account attached to a mortgage, depositing your salary directly into the offset and drawing it down as needed means your money is working against your mortgage interest every day — effectively earning you the equivalent of your mortgage interest rate, tax-free.

Compare that to a high-interest savings account paying 4.50% p.a., where you'd pay income tax on the interest earned. If you're in the 34.5% marginal tax bracket (including Medicare), your after-tax return from a savings account is around 2.95% p.a. But if your mortgage rate is 6.20%, having money in your offset effectively earns you 6.20% p.a. — tax-free, because it's a reduction in interest paid rather than income earned.

Keep your emergency fund in the offset

Most financial planning guidance suggests keeping three to six months of expenses in an accessible emergency fund. Rather than sitting in a savings account earning taxable interest, this money does better work inside your offset account. It remains instantly accessible (offset accounts are usually full transaction accounts) while simultaneously reducing your mortgage interest every day.

Avoid redraw confusion

Offset accounts and redraw facilities are different things. A redraw facility lets you access extra repayments you've made above the minimum — but the money is technically inside the loan, and lenders can impose conditions on accessing it. An offset account sits separately and is legally your money at all times. ASIC has previously flagged that some borrowers conflate these two products, which can lead to poor decisions. If your lender pushes redraw instead of offset, understand the distinction before agreeing.

Fixed vs Variable: What the ASIC Findings Mean for Split Loan Holders

Split loans — where you fix a portion of your mortgage for certainty and leave a portion variable — are common in Australia, particularly when rate movements are uncertain. The offset account issue matters here because:

The offset only reduces interest on the variable portion. If you've fixed $400,000 and left $100,000 variable, only the $100,000 benefits from your offset balance.
During a fixed term, if the entire loan is fixed, your offset does nothing. The fee you pay for the offset package may be dead money during this period.
When your fixed term expires and rolls to variable, the offset should automatically start applying again — but some lenders require you to re-link the account or notify them. Confirm this process with your lender before your fixed term expires.

A Note on Lender Remediation

Following ASIC's findings, affected lenders will be expected to conduct remediation — identifying customers who were overcharged, calculating the correct amount, and refunding the difference plus interest. However, remediation programmes vary in quality and completeness. Some lenders are proactive and contact affected customers directly. Others take a narrower view of who qualifies.

The best thing you can do is check your own numbers and not wait for a letter that may never arrive. If you're owed money, lodging your own complaint starts the clock on the formal response timeline.

Comparing Offset Accounts Across Lenders

If ASIC's findings lead you to question whether your current lender is the right one, it's worth comparing the offset account structures available. Key questions when comparing:

Feature	What to Ask
Offset type	100% offset or partial?
Applicable loan type	Variable only, or fixed too?
Number of accounts	Can you link multiple offset accounts?
Annual package fee	What is the total annual cost?
Minimum balance	Is there a minimum to activate the offset?
Account access	Can you use it as a full transaction account?
Linked debit card	Does it come with a card for everyday spending?

Most major banks and many non-bank lenders now offer 100% offset on variable rate loans with no minimum balance. If your current product falls short of this, it may be worth refinancing — though you'll need to factor in the cost and effort of switching, including potential discharge fees and stamp duty implications in some circumstances.

The Borrowing Power Calculator can help you understand your refinancing options, while the Mortgage Calculator lets you model the long-term impact of getting your offset working as it should.

Frequently Asked Questions

What is the difference between a 100% offset and a partial offset account?

A 100% offset account reduces your loan balance dollar-for-dollar for interest calculation purposes. A partial offset (e.g. 40% or 50%) only applies a fraction of your deposit balance to reducing the loan. Always check your product disclosure statement to confirm which type you have — the difference can be worth thousands of dollars per year.

Can ASIC force my lender to refund me if my offset wasn't working?

ASIC can direct lenders to conduct remediation programmes, but individual borrowers typically need to lodge a formal complaint with their lender first. If the lender doesn't resolve it satisfactorily, escalating to AFCA (the Australian Financial Complaints Authority) is the appropriate path. AFCA can order compensation.

Does an offset account work the same way for investment loans?

Yes, the mechanics are the same — your offset balance reduces the interest charged on the investment loan. However, there are tax implications: interest on an investment loan is generally tax-deductible, so reducing that interest also reduces your deduction. Talk to a registered tax agent about whether an offset or redraw strategy makes more sense for your investment property.

Is my offset account balance protected under the government guarantee?

Yes. Offset accounts are deposit accounts held with authorised deposit-taking institutions (ADIs). Balances up to $250,000 per account holder per ADI are protected under the Australian Government's Financial Claims Scheme. If your offset balance exceeds this threshold, consider spreading funds across accounts.

What if my lender says my offset is working but I'm not sure I believe them?

Request a detailed daily interest calculation in writing for at least one full month. This should show the daily opening loan balance, the daily offset balance, the net balance on which interest was calculated, and the interest charged. Run those numbers yourself using the formula in this article. If anything doesn't add up, lodge a formal complaint.

Should I always choose an offset account over making extra repayments?

It depends on your circumstances. Extra repayments also reduce your loan balance (and therefore interest), but once paid in, they're harder to access than an offset account balance. An offset gives you the same interest benefit while keeping funds accessible. For most borrowers, an offset account is more flexible — but only if it comes without excessive fees and is implemented correctly.

How long does lender remediation typically take?

Remediation programmes following ASIC enforcement actions can take anywhere from several months to over a year, depending on the scale of the problem and the lender's internal processes. Don't wait — if you believe you're owed money, start the formal complaint process with your lender now.

Related Calculators and Guides

Mortgage Calculator — model how your offset balance changes total interest paid and loan duration
Borrowing Power Calculator — explore refinancing options to a lender with a better offset product
Usable Equity Calculator — understand the equity available in your property if you're considering restructuring
Rent vs Buy Calculator — compare the long-term financial outcomes of owning versus renting

This article is for general information only and does not constitute financial, tax or legal advice. Individual circumstances vary. Consult a registered tax agent or licensed financial adviser before making decisions based on this information.