Offset vs Redraw in 2026: a decision framework for variable-rate Australian mortgage holders

An offset account and a redraw facility each let borrowers reduce the effective interest cost of a home loan by parking spare cash against the loan balance. On paper they look interchangeable. In practice the tax treatment, refinance portability, and access mechanics differ enough that choosing the wrong one can cost a mortgage holder four or five figures over a five-year holding period. Per ABS October 2025 housing finance data, around 72% of new owner-occupier loans written through brokers in Australia are variable-rate products, and roughly half of those include an offset account or redraw facility as a standard feature. Getting the choice right matters.

Data note: Interest rate and product feature references in this piece are as of April 2026 per each lender’s official product pages. Tax commentary reflects FY25-26 ATO guidance. Figures change; confirm with the current lender schedule before acting.

What each feature actually does

An offset account is a separate transactional bank account linked to your home loan. The balance sitting in the offset account is subtracted from the loan balance for daily interest calculation. A $500,000 loan with $50,000 in an offset account accrues interest as if the loan were $450,000, but the loan balance itself stays $500,000. Your regular repayment is unchanged, but a larger share goes to principal because the interest portion shrinks.

A redraw facility is a feature of the loan itself: you make extra repayments into the loan account, which reduces the principal immediately, and the lender lets you pull those extra repayments back out if you need them later. A $500,000 loan with $50,000 extra repaid has a true balance of $450,000, and interest is calculated on $450,000 directly.

Both reduce the interest bill by the same amount if the parked cash is the same. The question is what happens around that mechanical equivalence.

Where the tax treatment splits

The critical difference: interest deductibility for investment property loans.

If you own an investment property and you park cash in an offset account, the loan balance stays $500,000. All interest on $500,000 (minus the offset effect) is on an investment loan — deductible. If you later withdraw the $50,000 to buy a car, the loan balance is still $500,000, and interest deductibility remains intact because the purpose of the original loan hasn’t changed.

If instead you park cash as extra repayments on the same investment loan, the loan balance drops to $450,000 and interest is calculated on $450,000. Deductible interest is on $450,000. If you later redraw the $50,000 to buy a car, you’ve effectively borrowed $50,000 for a private purpose. The ATO’s view (Taxation Ruling TR 2000/2 and subsequent guidance) is that interest on that $50,000 becomes non-deductible because the borrowed funds were used for a private, not income-producing, purpose. You end up with a “mixed purpose” loan where tracking deductible vs non-deductible interest becomes genuinely painful.

Practical rule: If the loan is against an investment property, or there’s a real chance it will become one (e.g. you currently live in the home but may move out and rent it), an offset account is vastly preferable. Redraw on an investment loan is a tax trap waiting to happen.

Where the refinance portability splits

When you refinance a mortgage — switch from Bank A to Bank B — what happens to the cash?

Offset account: typically portable. You close the offset account at Bank A, move the cash to a new offset account at Bank B, and the offset effect continues. The offset balance is your money, held in your name, not locked to the specific loan.

Redraw: the funds are already applied to the loan as extra repayments. When you refinance, Bank A pays out the current net loan balance ($450,000 in the running example) to Bank B. The $50,000 buffer is effectively returned to you at refinance through the loan payout process — but if you wanted to keep the $50,000 sitting as a redraw buffer against the new loan, you’d need to make the $50,000 of extra repayments again at Bank B. Functionally not catastrophic, but it’s an extra administrative step and a timing gap.

Where the access mechanics split

Offset accounts typically work like a standard transaction account — debit card, BPAY, direct debit, ATM access, same-day transfers. For most offsets attached to owner-occupier loans this is instant or near-instant.

Redraw access is more variable. Some lenders provide online redraw with 24-hour availability; others require a written request or a 2–3 business day processing window. A handful of products limit redraw to a maximum number of transactions per year or set a minimum redraw amount (often $1,000 or more). If you’re using the buffer as a genuine emergency fund, the slower access can matter.

The fee economics

This is where lender business models show through. Offset accounts are expensive for lenders to maintain — they require a separate transaction account infrastructure — so lenders typically charge a monthly or annual fee for loans with an offset feature. Current April 2026 market pricing sits around $10–$15 per month or $300–$400 per year in ongoing package fees for mainstream bank products with offset attached. Discount banks and non-banks often waive offset fees but may charge slightly higher interest rates.

Redraw is essentially free — it’s built into the loan mechanics. No separate account, no separate fees. If you’re disciplined about not withdrawing the money for private use on an investment loan, redraw is cheaper to operate.

Annual cost math example: Suppose you can park $50,000 either way. Variable rate is 6.10% p.a. The interest saving is $50,000 × 6.10% = $3,050 per year in both cases. If the offset account carries a $360 annual package fee and the redraw is free, the net saving favours redraw by $360 per year — unless you lose $360+ in tax deductibility by mixing investment and private purposes, in which case offset pulls ahead.

A 2026 decision framework

Use this logic in order:

Is this loan now or potentially an investment loan? If yes → offset. Tax treatment alone justifies the fee.
Will you likely refinance in the next 2–3 years? If yes → offset has a small edge for portability, but not decisive.
Do you want frictionless emergency access to the buffer? If yes and your lender’s redraw is slow → offset.
Is this a pure owner-occupier loan with no investment possibility and you want the cheapest running cost? Redraw, assuming the package fee saving exceeds any rate premium.
Are you a disciplined saver who will actually park $30,000+ in the offset consistently? If no → neither feature earns back its fee; consider a simpler no-frills variable loan.

Most Australian borrowers default to offset because their broker recommends it; for genuine owner-occupier loans with no investment future, that default is often over-specced. But for anyone even considering investment property, for anyone with a partner who might take over the house as an investment, or for anyone with a “might move out and keep this as a rental” pattern, offset is the safer structural choice.

FAQ

Q1: Can I have both an offset account and use redraw on the same loan? A: Yes, most packaged variable loans allow both. The offset account is a separate transaction account; the redraw works on any extra repayments you make beyond the minimum. The two features don’t cancel each other out — they reduce interest on the combined basis (loan balance minus offset balance minus any redraw credit). In practice, most borrowers use one actively and ignore the other.

Q2: Does an offset account earn interest? A: No, the offset balance doesn’t earn interest (if it did, that interest would be taxable income). Instead, it saves interest on the loan, which is economically similar but with better tax treatment — the saved interest isn’t taxable. For a borrower paying 6.10% on a loan, parking $50,000 in offset is equivalent to a taxable savings account paying roughly 6.10% gross — which would be hard to find at that rate outside the mortgage-linked context.

Q3: How much cash do I need in an offset for it to be worth the fee? A: For a $360 annual package fee and a 6.10% variable rate, the break-even offset balance is $360 ÷ 6.10% ≈ $5,900. If you’re consistently holding at least $6,000 in the offset throughout the year, the feature pays for itself. Many borrowers pay the offset fee while holding less than break-even balances for months at a time — essentially subsidising the feature. If your cash position is lumpy and you can hold $30,000+ most months, offset is clearly worth it.

Q4: On a new purchase, should I pay a smaller deposit and keep more in offset, or make a larger deposit? A: Economically, for a given total loan balance they’re nearly equivalent (larger deposit saves at the variable rate; more in offset saves at the same variable rate). But a larger deposit may reduce Lenders Mortgage Insurance (LMI) if you cross the 80% LVR threshold, which is a one-time saving of potentially $10,000–20,000 — that’s worth prioritising. Above 80% LVR, keeping the cash in offset lets you redeploy it later (e.g. to a deposit on an investment property) without refinancing. A structured approach: use enough deposit to hit 80% LVR, then keep remaining cash in offset.

Q5: My lender calls it an “offset” but it’s actually 100% of the balance offset each day. Is that the same? A: Yes, “100% offset” is the standard Australian offset account. A small number of products offer “partial offset” (e.g. 50% or 75% of the balance counts against the loan), which is worse and should be priced accordingly. Always confirm the offset percentage on the product disclosure statement.

Q6: Can I have multiple offset accounts against one loan? A: Some lenders allow up to 5, 10, or unlimited linked offset accounts (useful for budgeting buckets — one for tax savings, one for holiday fund, etc., all offsetting the same loan). Others allow only one. If multi-offset is a priority, confirm with your lender; it’s a differentiated feature and worth shopping for.

Closing thought

The choice between offset and redraw is usually presented as a tradeoff between flexibility and simplicity. In reality the tax treatment on investment loans, the refinance mechanics, and the small fee difference all push toward a reasonably clear recommendation for most borrowers. If you’ve been using redraw on an investment loan for years and haven’t thought about the tax impact, it’s worth a conversation with your accountant before tax year end.

If you’d like a walk-through of how this applies to your specific loan structure, feel free to reach out to my team for a tailored look.

Disclaimer

This article is general information and is not personal financial, tax, legal or credit advice. Interest rate, product feature, and tax references are sourced from each lender’s official product pages and ATO guidance (see the data note above for the as-of date). Arrivau Pty Ltd (ABN 81 643 901 599) acts as an ASIC Credit Representative (CRN 530978) under its licensee’s Australian Credit Licence. Speak to a licensed broker and a registered tax agent before acting on anything discussed here.