How Does an Offset Account Work: How to Save on Your Mortgage with Go Mortgage

Every dollar sitting in your everyday bank account could be quietly chipping away at your home loan interest, while still being there the moment you need it. That’s the idea behind an offset account.
So, how does an offset account work in good practice, and is it actually worth the extra fees some lenders charge for it? As a Gold Coast mortgage broker who structures these loans every day, here’s the honest breakdown: the maths, the traps, and the best way to use an offset account properly.

Key Takeaways:

• An offset account is a transaction account linked to your home loan. Its balance is subtracted from your loan before interest is calculated daily.
• On a $500,000 loan at 6%, an average $30,000 in offset can save roughly $90,000 in interest and shave around 3 years off the term.
• Most come with a package fee. A free offset account exists with selected lenders; a broker can compare what’s best after fees.
• Offsets work best on variable rate home loans and are available on owner-occupier investment and most SMSF lending.

How Does an Offset Account Work?

An offset account is a type of bank account linked to your mortgage. The balance in this account is ‘offset’ against the remaining loan balance when calculating the interest you owe. Interest on Australian home loans is calculated daily. Each day, your lender subtracts your offset balance from your loan balance and only charges interest on the difference.

For example, if your mortgage balance is $400,000 and you have $50,000 in your offset account, interest is calculated on $350,000 instead of the full $400,000. Done consistently over the years, that single change saves tens of thousands and shortens your loan.

You don’t earn interest on the offset balance itself. Instead, you avoid paying interest on the equivalent amount of your loan, which is generally a much higher rate. Unlike in a regular savings account, the interest you save isn’t treated as taxable income.

100% Offset Vs Partial Offset: Know What You’re Signing Up For

Not all offset accounts are the same. There are two main types:

• 100% (Full) Offset: Every dollar in the account reduces the balance on which interest is calculated. This is the gold standard, what most people mean when they talk about an offset.
• Partial Offset: Only a portion of the balance counts; often a set percentage. Sometimes attached to lower-rate basic loan products. Worth doing the maths before assuming it’s a good deal.

Very few lenders also offer offset on fixed-rate loans, and the benefit is sometimes capped (often at the first $100,000). If you’re weighing up fixed vs variable home loan rates, the offset feature often tips the scale towards variable for borrowers who keep healthy savings.

What an Offset Account Could Save You: A Real Example

Numbers tell the story better than theory. Two Gold Coast buyers with identical loans: $500,000 over 30 years at 6% p.a. variable:

These figures are illustrative and assume the offset balance and interest rate stay constant. Plug your own numbers into our mortgage offset calculator to see the savings for your situation. Even modest balances make a meaningful dent over 25-30 years. Every day that money sits there compounds your interest savings.

How to Use an Offset Account Properly (And Make the Most of Your Offset Account)

Plenty of borrowers have offset accounts they barely use. To make the most of your offset account, the goal is simple: keep the balance as high as possible, for as long as possible. Here’s how to use an offset account properly so it actually pulls its weight:

1. Have your salary paid in. Deposit your income and savings into the account to keep the balance as high as possible.
2. Use it as your everyday transaction account. Use the account for daily expenses, but keep as much money in it as possible to maximise interest savings.
3. Run a credit card alongside it (carefully). Pay everyday expenses on a credit card and clear the balance in full each month, ensuring cash stays in the offset for longer. (This only works if you never carry a balance).
4. Park lump sums in offset. Tax refunds, bonuses, and inheritance; send them straight in while you decide. Every day in there will save you interest on your home loan rate.
5. Use multiple offsets to bucket your money. Some lenders allow up to 10. One for emergency funds, one for tax, and one for a holiday. The combined balance offsets your loan.

Offset Account Vs Redraw Facility: Which is Better?

Both reduce the interest you pay, but they’re not the same, especially if you might one day turn your home into an investment property.

• Offset Account: A separate transaction account. Funds remain yours and move freely. Cleaner for tax if the property later becomes an investment.
• Redraw Facility: Extra repayments paid into the loan that you can pull back. The money has technically reduced the loan, which can complicate interest deductibility if you ever convert the property.

For owner-occupiers staying put, redraw is fine, however note that a redraw facility can technically be ‘turned off’ by the lender jeopardising access to these funds. For anyone eyeing property investment loans or upgrading and renting out their first home, a 100% offset is usually the smarter long-term choice.

Common Mistakes that Cancel Out the Benefit

• Paying for an offset you don’t use. If you keep $2,000 in there and the package fee is $400 a year, you’re losing money. Build the balance up, switch to a free offset account on a basic product, or restructure entirely.
• Assuming all offsets are 100%. Read the product disclosure or ask your broker. A partial offset on a small balance is rarely worth a higher rate.
• Mistaking a redraw account for an offset. Some online lenders market “offset-style” sub-accounts that are actually redraws. The tax and accessibility differences can bite later.
• Choosing an offset on a fixed rate without checking caps. Many lenders cap the offset benefit on fixed loans, sometimes to the first $100,000. Above the cap, you’re paying for a feature that does nothing.

Getting the Right Loan Structure from Day One

Choosing the right home loan isn’t about chasing the lowest advertised rate; it’s about matching the structure to your life. With over two decades in the industry, the team at GO Mortgage on the Gold Coast compares offset products from Australia’s leading lenders to find the one that genuinely saves you money after fees.

Buying your first home, your next one, or refinancing with a Gold Coast mortgage broker for a better offset product? We’ll run the numbers; call our Arundel office on 1300 855 244 today.

Frequently Asked Questions