How an offset account works and how much you could save

An offset account is a transaction account linked to your home loan. The balance in the offset account reduces the loan amount on which interest is charged. For example, if you have a home loan of $750,000 and $50,000 in your offset account, you’ll only be charged interest on $700,000.

That means a greater share of each repayment goes towards paying off your loan rather than interest. Over time this can help you pay off your mortgage sooner and reduce the total interest you pay.

How an offset account works day‑to‑day

An offset account works like an everyday bank account. You can have your salary paid into it, pay bills, set up direct debits and use a debit card.

Interest on most home loans is calculated daily. Each day your lender subtracts your offset balance from your loan balance before calculating interest. The more money you keep in the offset and the longer it stays there, the more interest you save.

Potential savings: an example

Even an average offset balance can deliver meaningful savings. In a case study published by ASIC, a couple borrowed $750,000 over 30 years at 6.25% p.a. and kept an average balance of $50,000 in their offset account. After one year they found the offset had not been linked properly and they had paid over $3,000 in additional interest. Had the error gone undetected for the life of the loan, ASIC estimated they would have missed nearly $230,000 in interest savings and taken an extra four years to repay the loan.

This example shows that an offset account can significantly reduce interest costs when the loan is large and the offset balance is consistently maintained.

Is an offset account worth it for you?

An offset account may be worth considering if you have a large loan and regularly keep a savings balance, and you want flexible access to your money.

It may not be worth it if you usually keep a low balance, the loan charges higher fees to include an offset feature, or the interest rate is noticeably higher than comparable loans without an offset.

Some lenders charge for offset features through higher interest rates, account fees, or both. It’s important to weigh the cost of the fees against the interest you realistically expect to save. The higher your loan and the larger your offset balance, the greater your potential savings.

Offset versus redraw

Both an offset account and a redraw facility can help you save on interest, but they work differently:

• An offset account is a separate transaction account linked to your mortgage. Your savings reduce the balance on which interest is charged while remaining fully accessible.
• A redraw facility lets you make extra repayments directly onto the loan. You may be able to withdraw those extra repayments later, depending on your loan terms.

Before deciding which option suits you, check the lender’s fees, interest rate and access rules.

Using a credit card with an offset account

Some people use a credit card alongside an offset to maximise interest savings—salary goes into the offset, everyday spending is put on the card, and the card balance is paid in full by the due date. This keeps more money in the offset for longer.

However, this strategy only works if you can reliably repay the credit card in full each month. The average credit card interest rate is much higher than a typical home loan rate.

What type of loan offers an offset?

Offset accounts are generally available with variable rate home loans. They are less common with fixed‑rate loans, though some lenders offer partial offset arrangements on fixed portions.

Four things to check with your offset account

1. Make sure the offset is linked properly – don’t assume it’s working just because you’ve requested one. Check via your bank’s app, online banking or statements.
2. If you can’t see your interest savings, contact your bank and ask questions.
3. Refinancing or switching loan products can break the offset link—you may need to re‑link the account.
4. Act quickly if something looks wrong. Offset failures can cost you money over time.

How to estimate your own savings

You can use a mortgage calculator that allows you to model an offset balance. Enter your loan amount, interest rate, loan term and an estimated average offset balance to see how your total interest changes and how much sooner you could pay off the loan. HomeLoanAI’s calculators let you compare scenarios side‑by‑side so you can test different offset balances and loan features.

All calculator results are estimates only and do not constitute a loan offer, approval or personal financial advice. If you’d like personalised help comparing home loan features, you can request an optional handoff to a human broker. HomeLoanAI does not provide personal financial advice, and individual circumstances should be discussed with a qualified professional.