Offset Account vs Redraw Facility: Which Actually Saves More Interest?

It’s a common question for anyone with a home loan: should I park my extra cash in an offset account or use a redraw facility? Both can reduce the interest you pay, but they operate differently and suit different financial habits and goals. The short answer is that an offset account generally offers more flexibility and clearer tax treatment, while a redraw facility can be a simpler, lower-cost way to reduce interest if you’re disciplined about leaving the money alone.

How each option works

An offset account is a transaction account linked to your home loan. The balance in that account is ‘offset’ against your loan balance when interest is calculated. For example, if you have a $500,000 loan and keep $20,000 in the offset, you’ll only be charged interest on $480,000. Your repayments stay the same, so more of each repayment goes toward reducing the principal, and you pay off the loan faster.

A redraw facility lets you make extra payments into your loan and then withdraw those extra funds later, subject to the lender’s conditions. When you put money into the redraw, your loan balance drops and so does the interest calculated. The key difference is that the money is inside the loan, not in a separate account you can spend from like everyday savings.

Interest savings: which comes out ahead?

In purely mathematical terms, both an offset account and a redraw facility can deliver the same interest saving, provided the same surplus amount is applied and withdrawn at the same times. The real difference lies in what happens when you take money back out.

• With an offset, removing some of the balance immediately increases the amount of your loan subject to interest, but the loan account itself is untouched. It’s clean and predictable.
• With a redraw, withdrawing extra payments is effectively re-borrowing that money. The lender may charge a fee, impose a minimum redraw amount, or restrict how often you can access it. Some lenders also treat regular redraws as a sign of financial stress, which could affect future lending decisions.

Tax implications — an important distinction

Tax treatment is often the deciding factor between the two structures.

• Offset account: Because the money sits in a separate deposit account, it hasn’t reduced the loan principal. If you later turn the property into an investment, the original loan amount remains intact for tax purposes. This is a major reason why many investors and people who might convert a home to an investment property prefer an offset account.
• Redraw facility: Every extra payment you make permanently reduces the loan balance. If you later redraw that money for personal use (not investment purposes), the portion of the loan’s interest that relates to the redrawn amount may no longer be tax-deductible. This can create a messy loan split where only part of the interest is deductible, and you’ll need careful record-keeping.

The Australian Taxation Office’s rules around loan purpose and deductibility are strict — an offset account avoids this headache because the loan value never changes.

Practical differences and costs

Feature	Offset Account	Redraw Facility
Access to funds	Instant, via card or transfer (like everyday banking)	Subject to lender process; may take days and incur fees
Typical cost	Often packaged with a professional or annual fee	Usually included at no extra cost, though some lenders charge per redraw
Interest-saving mechanism	Reduces the loan balance daily for interest calculation	Reduces the loan balance directly as extra repayments are made
Impact on loan principal	Does not alter the loan principal	Permanently reduces the principal until redrawn
Tax clarity	Clear separation between loan and savings	Can complicate deductibility if redrawn for non-investment purposes

Lenders may also apply different interest rates to loans with offset versus basic loans with redraw. It’s common to pay a slightly higher rate or a package fee for a full offset account. If your offset balance is consistently low (say under $10,000), the extra cost might outweigh the interest saved. The Moneysmart guide on choosing a home loan points out it’s worth checking whether you’ll really use the feature and whether a more basic loan could be better value.

Using OzLoan’s calculators to model the numbers

Your personal numbers will dictate which option delivers the better result. OzLoan’s free calculators let you model scenarios without guesswork:

• The Offset Account Savings Calculator shows how different offset balances reduce your total interest and loan term.
• The Home Loan Repayment Calculator helps compare basic loan repayments with and without extra contributions.

You can run both types of scenarios side by side to see the dollar difference over your remaining loan term. No sign-up or email is needed.

When one might be better than the other

Consider an offset account if:

• You want daily access to your surplus funds for living expenses or emergencies.
• There’s a chance the property could become an investment down the track (preserving tax deductibility).
• You value simplicity in tax record-keeping.

A redraw facility may suit you if:

• You’re disciplined and don’t need to touch the extra money often.
• Your loan doesn’t charge for redraws and you avoid higher package fees.
• You’re certain the property will remain owner-occupied and you won’t need to split loan purposes.

A note on professional advice

The information OzLoan provides is general in nature and doesn’t take into account your personal objectives, financial situation or needs. OzLoan isn’t a lender and doesn’t promise any particular interest rate, loan approval or savings outcome. If you’re uncertain about tax deductibility or which structure aligns with your long-term plans, speaking with a licensed financial adviser or tax professional is a sensible step.

What to look for in a loan comparison

When you compare home loans, pay attention to more than just the headline interest rate. Check the comparison rate, any monthly or annual fees tied to offset accounts, and redraw conditions such as minimum amounts or processing time. Smaller lenders and online-only providers sometimes offer basic loans with free redraw that rival offset accounts on net interest savings, especially if your offset balance would be modest.

Ultimately, both features are tools to reduce interest — the right one depends on how you manage money day to day and your future plans for the property.