Both features reduce the interest you pay. Both let you access money you have put toward your home loan. But they work differently, they cost differently, and for investors especially, they are taxed differently. Getting this wrong can cost you thousands — not just in interest but in avoidable tax complications.
Here is a plain breakdown of how each works and when one is the better choice.
An offset account is a transaction account linked to your mortgage. The balance sitting in it is offset against your loan balance before interest is calculated. You do not earn interest on the offset account. Instead, you avoid paying interest on the equivalent portion of your loan, which is worth more because mortgage rates are higher than deposit rates.
With a $500,000 loan at 6.70% and $50,000 in your offset, you pay interest on $450,000. That saves you $3,350 per year compared to having nothing in offset. The money stays in your name, accessible like any bank account, with a card and BSB.
A redraw facility lets you access extra repayments you have already made on your loan. If your minimum repayment is $3,000 a month and you have been paying $3,500, that extra $500 per month builds up as available redraw. The money has already been applied to your loan balance, so it is reducing the interest you pay in the same way offset does. The difference is in how you get it back.
To access redraw funds, you submit a request through your bank's app or branch. The bank processes it, usually within one to three business days. And here is the part most borrowers do not find out until it matters: the bank can restrict or refuse redraw access during financial hardship, or change the terms of the facility entirely. It is not your money sitting in an account. It is equity in the property, and the bank has discretion over it.
Offset funds are genuinely liquid. They sit in a transaction account. You can tap them with a debit card, transfer them out overnight, use them for an emergency at 10pm on a Sunday. There is no application, no processing time, no bank discretion involved.
Redraw is slower and less certain. For most borrowers in normal circumstances this is fine. But if you lose your job, suffer a health crisis, or find yourself under financial pressure at the exact moment you need those funds, you may find the bank has tightened access. This has happened. The banking royal commission documented cases where lenders changed redraw terms without adequate notice. ASIC has flagged redraw access risk as a consumer concern.
This is the issue financial planners most commonly flag, and it catches investors off guard.
For investment loans, the interest is deductible only to the extent the loan was used to produce income. If you take out extra repayments via redraw and spend that money on personal expenses, a holiday, or buying a car, you have created what the ATO calls a mixed purpose loan. You cannot simply deduct 100% of the interest anymore. You need to apportion it, and apportioning a single loan account between investment and private use is a compliance nightmare that can persist for the life of the loan.
Offset accounts do not have this problem. The money stays yours, in your account, entirely separate from the loan. There is no commingling of funds. If you later convert your home to an investment property and want the full interest deduction, having savings parked in offset rather than redrawn into the loan is the cleaner position. The ATO's guidance on this is consistent: mixed purpose loans are a red flag and are harder to justify at audit.
Lenders charge for offset accounts. The fee is typically $10 to $15 per month (around $120 to $180 per year), or they price it into a slightly higher interest rate on the loan product. Some package deals bundle the offset fee with annual fees of $300 to $400 alongside other features.
Redraw is almost always free. There is no facility fee, no ongoing charge, and no rate premium for having access to it.
So if you have a small balance sitting in offset and you are paying $15 a month for the privilege, you may be paying more in fees than you are saving in interest. On a $10,000 offset balance at 6.70%, you are saving about $670 a year, well clear of the fee. On a $2,000 balance, you are saving $134 and paying $180 in fees. Do the maths for your own situation.
Here is the comparison most people want. On a $600,000 loan at 7% with $50,000 parked against the loan:
Offset: you pay interest on $550,000. Annual interest saving = $3,500.
Redraw (extra repayments of $50,000): your loan balance is $550,000. Annual interest saving = $3,500.
Same number. The interest reduction is mathematically identical. The difference is everything else: access, tax treatment, and what happens if your circumstances change.
Offset wins for owner-occupiers with variable income — freelancers, commission earners, business owners, anyone who might need a large cash buffer at short notice. It also wins for anyone who has even a small chance of converting their home to an investment property later, because keeping funds in offset avoids the mixed-purpose loan trap. And it wins for anyone who values knowing with certainty that their savings are accessible without bank approval.
Redraw works well for borrowers who are disciplined, have a separate emergency fund elsewhere, and are owner-occupiers with no plans to ever rent the property out. If you have three months of expenses in a separate savings account, you are not relying on redraw as a liquidity backstop. In that case, avoiding the offset fee is a reasonable call.
The ATO does not tell you which structure to use. But its guidance on mixed-purpose loans, and the compliance risk that comes with redrawn investment loan funds being used privately, makes the offset position significantly cleaner for investors and for anyone who might one day have an investment property. Keeping your savings in offset means the loan balance and the nature of the loan never change. The deductibility position stays clean indefinitely.
Most financial planners recommend offset for owner-occupiers. The $10 to $15 monthly fee is worth paying for the access certainty and the tax cleanliness, particularly if you have a meaningful balance to park there. Redraw is not a trap, but it comes with conditions that most borrowers do not read until they are inconvenient. If you are unsure which structure your current loan has, check your loan documents or call your lender. Many borrowers assume they have offset when they only have redraw.
At the current average variable rate of around 6.70%, the interest saving from either feature is real and material. But the structure around that saving matters too. Do not let the bank decide that for you by default.
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