Park $40,000 against a $650,000 loan and you save about $2,400 a year in interest. Offset or redraw, that number is the same. Identical, to the cent.
That surprises people, and it means the offset vs redraw home loan decision was never about the interest maths. It comes down to three things no comparison calculator shows you: who controls the money, what the account costs, and how the ATO treats each dollar on the day you move it. Get those three right and the same $40,000 can be worth thousands more over the life of the loan.
The timing matters more than usual. The RBA lifted the cash rate in February, March and May 2026, held it at 4.35% in June, and meets again on Tuesday 11 August 2026. Rising rates cut both ways for borrowers: less competition at auctions and more room to negotiate, but also a bigger reward for structure. At a variable rate above 6%, a parked buffer saves you more interest, tax-free, than most savings accounts pay after tax. Where you park it is the whole question.
Same interest saving, so why does the choice matter?
Both features do one job. Interest on a variable home loan is calculated daily, and both an offset account and a redraw facility shrink the balance that calculation runs on. Money in a 100% offset account is netted against your loan balance each day. Extra repayments sitting in redraw reduce the balance directly. Either way, $40,000 parked against a $650,000 loan at 6.00% saves roughly $2,400 a year. (If the mechanics are new to you, start with our offset account explained guide.)
The differences live everywhere else.
| Offset account | Redraw facility | |
|---|---|---|
| Where the money sits | A deposit account in your name | Inside the loan, as extra repayments |
| Whose money it is | Yours | Prepaid to the lender; access is a loan feature |
| Interest effect | Identical | Identical |
| Typical cost | Package fee of roughly $300 to $400 a year, or a rate loading | Often free on basic loans |
| Getting it out | Transfer, card, ATM. Anytime | Subject to the lender's redraw terms |
| Tax when you withdraw | Loan untouched; deductibility preserved | Treated as new borrowing; purpose test applies |
Notice the cost row. Offsets usually ride on package loans that charge an annual fee or a slightly higher rate, while basic loans with free redraw tend to price sharper. If the contest were interest alone, redraw on a basic loan would win most head-to-heads. It isn't, so keep reading before you pick the cheap option.
Your redraw isn't your money
Read that again, because it is the single most misunderstood line in Australian home lending. Money in redraw is not sitting in an account with your name on it. You made extra repayments. The lender now owes you access to them, on the lender's terms, and those terms let it change minimum redraw amounts, add processing delays, or reduce the available balance.
This is not a theoretical risk. In April 2020 one mid-sized Australian lender cut the redraw limits of around 20,000 borrowers overnight, entirely within its contract terms, and most of those borrowers found out after it happened. Lenders tighten features when arrears tick up, and they don't always tell you the rule changed before it applies to you.
Follow the chain. Redraw access can be varied. If your buffer doubles as your emergency fund, the redraw clause decides whether you can reach it in the week your income stops, which is exactly the week a nervous lender is least keen to hand money back. An offset is a deposit account, legally your money, available at the ATM on a Saturday. The practical rule: genuine emergency savings belong in offset; surplus you are happy to lock away can go to redraw.
There is a flip side, and it favours redraw. Easy access cuts both ways. If a debit card linked to $40,000 sounds like a renovation waiting to happen, the friction of a redraw request is a feature, not a bug, and channelling surplus into extra repayments rather than an offset balance can be the structure that saves you from yourself.
What does the ATO see when you pull money back out?
This is where the two products stop being cousins and become strangers, and almost nobody prices it in at settlement.
Pull $40,000 out of an offset and nothing happens to the loan. The balance, the purpose and the paper trail are untouched, because you moved your own savings. Pull the same $40,000 out of redraw and the ATO treats it as new borrowing. Deductibility then follows what the redrawn money buys, not the property securing the loan. Spend it on a car or the deposit for your next home and that $40,000 slice of the loan is private borrowing: the interest on it can never be claimed, even if the property becomes a rental, and your accountant now apportions a mixed-purpose loan for as long as the loan exists.
Chain it through. Around one in three Australian owner-occupied homes eventually earns rental income, and since the 12 May 2026 federal budget, rental losses on established properties bought after budget night are quarantined from 1 July 2027: still deductible against property income and carried forward, but no longer offset against wages (existing holdings keep full negative gearing, and new builds are untouched). The deductions you can still legitimately claim are worth protecting harder, not less. If there is any chance your current home becomes an investment property, or you plan to build a portfolio through debt recycling, the offset preserves your options. Redraw quietly burns them.
Mel and Dan: same $40,000, two different endings
Mel is a primary school teacher, Dan is a sparky. They owe $650,000 on a townhouse in Stafford, on Brisbane's northside, and they hold a $40,000 buffer. Assume an illustrative 6.00% variable rate throughout (not a quoted offer; actual rates and comparison rates vary by lender as at July 2026).
Path A: basic loan, free redraw. The basic product prices about 0.10 percentage points sharper and charges no annual fee. They save the same $2,400 in interest on the buffer, plus roughly $650 from the lower rate. Against an offset package with a $395 annual fee, Path A runs about $1,050 a year ahead. After five years they are roughly $5,200 in front. Then, in 2031, they upgrade to a house in Everton Park, keep the townhouse as a rental, and redraw the $40,000 for the new deposit. The ATO calls that new private borrowing. Interest on the $40,000, about $2,400 a year, is no longer deductible against the rent, which at a 37% marginal rate costs them roughly $890 a year in lost tax benefit, plus an apportionment headache every tax return. Within six years the tax leak has swallowed the entire five-year head start. Ten years after the conversion they are about $3,700 behind, and the gap keeps widening for the rest of the loan; on a 25-year tail, call it $8,900 and counting.
Path B: offset package, $395 a year. Same interest saving each year. Come 2031 they sweep the $40,000 from the offset into the new deposit. The townhouse loan is still $650,000, still 100% original purpose, so the full interest bill becomes deductible against the rent from day one. Clean books, no apportionment, options intact.
The gap: the cheaper structure won every year until the year that mattered.
Based on typical scenarios. Individual outcomes vary.
Offset vs redraw: which one should you pick?
There is no universal winner, but there is usually a clear winner for your situation.
| Your situation | Lean towards |
|---|---|
| Any chance this home becomes a rental later | Offset |
| Forever home, lowest possible cost | Redraw on a basic loan |
| Big balances that would tempt you | Redraw, for the friction |
| Self-employed, lumpy income, tax set aside | Offset |
| Planning debt recycling or a portfolio | Offset |
| Buffer under about $10,000 | Redraw; the fee likely eats the benefit |
Plenty of borrowers should hold both: an offset for the emergency fund and tax money, redraw for surplus you can afford to lock away. Split loans make that easy, and the same conversation should settle interest-only vs principal and interest for any future investment slice, because the two decisions interact.
Structure like this belongs in the loan design, not as a tick-box at settlement. The WityLoanPlan, the digital proposal your Wity broker builds before anything goes to a lender, maps it explicitly: which split carries the offset, where redraw sits, what the fee buys, and what happens if the townhouse becomes a rental in five years. Versioned, digitally accepted, and yours to interrogate before you commit. And if you are already on a loan where a $395 package fee buys an offset holding $3,000, that is a structure problem refinancing can fix, quite apart from the rate. Whichever way you go, a well-placed buffer remains one of the fastest levers to pay off your home loan faster.
Not sure which structure fits your next five years? Start the Wity questionnaire → Free, no credit check, two minutes, and you'll leave with the numbers either way.