Putting your Australian tax refund into your mortgage offset account is one of the smartest ways to reduce your home loan interest while keeping your money accessible. Every dollar in your offset account works to reduce the balance on which you pay interest, potentially saving you thousands over the life of your loan. The process is straightforward: simply deposit your tax refund into the linked offset account, and the savings begin immediately without locking the funds away.

What an Offset Account Does

A mortgage offset account is a transaction or savings account linked to your home loan. The balance in this account offsets your loan balance when your lender calculates interest charges. According to ASIC MoneySmart, if you have a $400,000 home loan and $20,000 in your offset account, you only pay interest on $380,000.

Offset accounts are typically available with variable-rate home loans. The key advantage is that your money remains fully accessible for everyday expenses or emergencies while simultaneously reducing your interest costs.

How Your Tax Refund Reduces Interest

When you deposit your tax refund into your offset account, the interest savings start from the day the funds clear. Here is how the numbers work:

Imagine you have a $400,000 home loan at a 6.50 per cent variable rate and you receive a $3,000 tax refund from the ATO. By placing that $3,000 in your offset account for the full year, you avoid paying interest on that portion of your loan. At 6.50 per cent, that saves you roughly $195 in interest over 12 months. If you leave the refund there for five years without withdrawing it, the compounding effect could save you close to $1,000, depending on rate movements.

The savings are greater if you already have funds in your offset account. A $3,000 refund added to an existing $15,000 balance brings your total offset to $18,000, reducing your effective loan balance to $382,000 and amplifying your interest savings.

Steps to Deposit Your Tax Refund

The process is simple and takes minutes:

  1. Lodge your tax return through the ATO’s myTax portal or via a registered tax agent. Most refunds are processed within two weeks if you lodge online.
  2. Provide your offset account BSB and account number as the refund destination when lodging your return. Confirm with your lender that your offset account can receive direct deposits (most can).
  3. Once the ATO processes your refund, the funds are deposited directly into your offset account. You will see the interest savings reflected in your next loan statement, as your lender recalculates interest daily based on your offset balance.

There are no penalties, fees, or restrictions for depositing a tax refund into an offset account. The money remains yours to withdraw at any time.

Read also: How to Use Your Tax Refund in a Mortgage Offset Account in Australia

When It Makes Sense

Using your tax refund for your offset account makes the most sense when you already have an emergency fund and no high-interest debt. If you carry credit card balances or personal loans with interest rates above 10 per cent, paying those off first typically delivers greater savings than offsetting a 6 to 7 per cent home loan.

If you do not yet have an offset account, speak with your lender about adding one to your loan package. Some lenders offer offset accounts at no extra cost, while others charge an annual fee of $200 to $400. According to Finder Australia, the fee is usually worthwhile if your offset balance saves you more in interest than the fee costs.

Be aware that offset accounts are less common with fixed-rate loans. If your loan is fixed, your lender may allow a partial offset or offer a redraw facility instead, though redraw does not provide the same daily interest reduction.

Important Considerations

Offset account balances fluctuate as you deposit and withdraw funds. Your interest savings depend on your average daily balance, not just the balance at month-end. Keeping your refund in the account year-round maximises the benefit.

Interest rates change frequently, particularly variable rates which are influenced by the Reserve Bank of Australia cash rate. As of July 2026, verify current home loan rates and offset account terms with your lender before deciding, as advertised rates differ from the comparison rate (which includes most fees and charges).

Eligibility, fees, and offset account features vary by lender and loan product. Confirm your offset account setup and any associated costs with your lender or a licensed mortgage broker for your personal situation.

General Advice Warning

The information provided is general in nature only and does not consider your objectives, financial situation, or needs. You should consider obtaining personal advice from a licensed mortgage broker or financial adviser before acting on it. This is not personalised financial or tax advice. For personal tax advice, consult the ATO or a registered tax agent. For home loan advice, speak with a licensed lender or mortgage broker.