Offset vs redraw: costs, access and tax questions

The balance may look similar while the arrangement is different

A fictional borrower has a $500,000 home loan and $40,000 of spare cash. With a fully linked 100% offset, interest may be calculated on $460,000 while the loan principal and separate account remain distinct. If the borrower instead makes a $40,000 extra repayment, the loan balance falls to $460,000. The lender may allow some extra repayments to be redrawn under its conditions.

MoneySmart explains this basic distinction: an offset is an account linked to the loan, whereas redraw is access to extra loan repayments. The fact that both can reduce interest does not establish identical access, fees or tax outcomes.

Check the product documents rather than assuming every bank uses the same arrangement. An offset might be partial, linked to only one loan split or unavailable on a particular fixed-rate product. “Offset available” is not enough information to calculate the benefit.

Source: MoneySmart: mortgage offset accounts

Use a simple interest illustration before comparing products

At an illustrative 6% annual loan rate, a constant $40,000 reduction in the interest-bearing balance corresponds to about $2,400 less interest over one year. That is $40,000 multiplied by 6%. It assumes the balance and rate remain unchanged and ignores daily timing, compounding and fees.

The average balance matters more than the highest balance shown in an app. If the money sits in the account for only part of the year or is regularly spent, the benefit is smaller. If the linked loan is smaller than the offset balance, ask how any excess is treated; do not assume it creates additional mortgage savings.

This is an illustration of interest avoided, not a promised return or a quote from a lender. The actual lender calculation should show the applicable daily balances, rate and account linkage.

A higher loan rate can outweigh the account benefit

Suppose an offset-eligible loan costs 6.1% while an otherwise comparable loan costs 6.0%, and the loan balance averages $500,000. The extra 0.1 percentage point costs about $500 a year before amortisation. Add a fictional $300 annual package fee and the feature needs to overcome about $800 of extra yearly cost.

At 6.1%, an average offset balance of roughly $13,115 would produce $800 of simple annual interest savings. That is $800 divided by 0.061. A borrower averaging only $8,000 in offset would save about $488 under the same simplified calculation, less than the additional $800 cost.

This comparison is deliberately narrow. Actual rates, balances and other features may differ. Its value is showing why an offset should be assessed as part of the whole loan package, rather than selecting the product because the account itself sounds useful.

Access is a practical question, not just a screen balance

An offset account often operates like an everyday account. Redraw access depends on the loan terms, which can include restrictions, processing requirements or fees. Read the lender’s current agreement and ask how access works when the loan changes or approaches its end.

Think about the purpose of the money. A household may need cash for a rental bond, urgent repair or a period without work. A displayed available redraw figure is not a substitute for understanding the contractual access conditions. Check whether joint account or borrower approvals affect your ability to move funds.

MoneySmart also warns borrowers to confirm that the offset is actually linked correctly, particularly after a loan change. A labelled account that has not been linked to the intended loan may fail to deliver the expected interest reduction. Inspect the statement or ask the lender to demonstrate the calculation.

Sources: MoneySmart: mortgage offset accounts · MoneySmart: pay off your mortgage faster, extra repayments and redraw conditions

Why a future rental property raises a separate tax question

Tax deductibility depends on the use of borrowed money and the relevant circumstances, not simply on which property secures the loan. The ATO’s Taxation Ruling TR 2000/2 explains that a redraw is treated as a further borrowing and that the use of those redrawn funds matters for interest deductions.

Consider a deliberately simplified situation: someone pays extra into a loan, then redraws money for a private purchase. Later the original home becomes a rental. It is unsafe to assume that all interest on the resulting loan is deductible merely because the property now produces rent. Mixed uses can create an ongoing apportionment problem.

This is a reason to obtain advice before transfers, refinancing or changing a property’s use. It is not a debt-recycling instruction or a claim that an offset guarantees a tax outcome. A tax agent needs the transaction history, ownership details, actual purposes and current law.

Source: ATO: Taxation Ruling TR 2000/2, redraw and mixed-purpose borrowing

Keep a usable record of what actually happened

Download loan statements and retain records showing the original borrowing, additional repayments, redraws and the use of any borrowed funds. If there are several loan splits, identify which transaction belongs to each. A short note written at the time is often easier to interpret than reconstructing a series of transfers years later.

For the product comparison, record the loan rate, package fee, account fee, offset percentage and expected average cash balance. Add a separate access question rather than converting convenience into an invented dollar benefit. If a lender changes the rate or product, review the comparison again.

Elaris’s loan calculator estimates a conventional monthly principal-and-interest repayment. It does not replicate daily offset balances, lender redraw conditions or tax deductibility. Use it to understand the base repayment, then request the feature-specific calculation from the lender.

Check fixed-rate and refinance conditions before moving a large amount

MoneySmart’s fixed-versus-variable guidance notes that fixed loans may restrict extra repayments or have break costs. A borrower can therefore create a fee by acting on a general “pay more into the mortgage” suggestion without checking the agreement.

Ask for a written explanation of any limit, how the lender measures it and the consequences of exceeding it. If a loan is split, verify which part receives the offset benefit and which part accepts extra repayments. When refinancing, check what happens to the old offset linkage and automatic payments.

Avoid changing several things at once without a record. A rate change, transfer and new account can make it difficult to tell whether the feature is working. Confirm the result on the next statement and raise any mismatch promptly.

Source: MoneySmart: fixed vs variable home loan interest rates

Avoid counting the same cash as both spent and offsetting

An annual bill reserve can sit in an offset until the bill is paid, but it cannot continue reducing interest after the payment leaves. If $12,000 is gradually accumulated and then used for a renewal, modelling a constant $12,000 offset over the whole year overstates the benefit.

Use a rough month-by-month balance when the cash varies substantially. Start with the available balance, add expected receipts and subtract dated spending. The resulting average is a better input than the peak amount just before a bill. Keep a separate record of what the money is earmarked for so the apparent offset balance does not encourage spending it twice.

The same discipline helps an emergency reserve. Money allocated to a known school fee or insurance premium is not also an uncommitted emergency fund. Account labels can organise cash, but a household plan must still identify the commitments attached to it. Keep the lender’s response with the comparison so a future review can distinguish agreed conditions from an assumption.

FAQ: Is redraw just my savings in another account?

Extra repayments have reduced the loan debt; redraw is governed by the lender’s facility. That differs from keeping money in a separate offset account. Before using redraw as an emergency reserve, confirm the access conditions and what happens when your loan circumstances change.

FAQ: Is an offset always better than a savings account?

No universal answer follows from the feature name. Compare interest avoided against after-tax savings interest, any extra loan rate and fees, access and the purpose of the cash. Rates can change. A higher-rate loan with a small average offset balance may cost more overall.

FAQ: Can I deduct interest after redrawing for a holiday?

A private holiday does not become an income-producing purpose merely because the borrowing is secured against a rental property. The ATO ruling requires attention to the use of the redrawn money. Ask a registered tax agent to assess the actual borrowing history rather than assuming deductibility.

Source: ATO: Taxation Ruling TR 2000/2, redraw and mixed-purpose borrowing

FAQ: What is the first question to ask my bank?

Ask the lender to show which loan the account is linked to, the offset percentage, the fees and an example using your expected average balance. For redraw, ask what access is permitted under the contract. Then compare the complete annual cost against the alternative loan.

Sources and editorial notes

Sources checked 23 October 2026. Worked examples are fictional illustrations. Rules, eligibility and product terms can change; use the official source for your circumstances.

• MoneySmart: mortgage offset accounts ↗
• ATO: Taxation Ruling TR 2000/2, redraw and mixed-purpose borrowing ↗
• MoneySmart: fixed vs variable home loan interest rates ↗
• MoneySmart: pay off your mortgage faster, extra repayments and redraw conditions ↗

General information, not an individual financial or legal assessment. AI-assisted drafting with source checks; independent professional review has not been completed. How we prepare our guides · Suggest a correction