How to Use Offset Accounts to Reduce Home Loan Interest in Australia
An offset account is one of the most powerful tools Australian homeowners can use to reduce their mortgage interest and pay off their loan faster. By linking a transaction or savings account to your home loan, you can effectively reduce the balance on which interest is calculated, without actually paying down the principal. This guide explains everything you need to know about offset accounts—how they work, the different types available, their benefits and drawbacks, and practical strategies to maximize your savings.
What Is an Offset Account and How Does It Work?
An offset account is a bank account linked to your home loan. The balance in this account is “offset” against your outstanding loan balance daily, reducing the amount of interest you pay. For example, if you have a $500,000 home loan and $50,000 in your offset account, you will only be charged interest on $450,000. The interest saved is effectively a tax-free return on your savings, equivalent to your mortgage interest rate.
Offset accounts are typically offered with variable rate home loans, though some lenders also provide them with fixed rate loans (often with partial offset or caps). They function like a regular transaction account—you can deposit your salary, pay bills, and withdraw funds as needed. The key difference is that every dollar in the account works to reduce your interest costs.
How Interest Is Calculated with an Offset Account
Interest on home loans is usually calculated daily. With a 100% offset account, the full balance is deducted from the loan principal each day before interest is applied. This means even short-term deposits, like a pay cheque sitting in the account for a few days, can save you interest. The more money you keep in the offset, and the longer it stays there, the greater the savings.
It’s important to note that offset accounts do not reduce your required monthly repayments unless your lender recalculates them based on the reduced balance. Instead, a larger portion of your repayment goes toward the principal, helping you pay off the loan faster.
Types of Offset Accounts
Not all offset accounts are created equal. Understanding the different types can help you choose the right one for your financial situation.
1. Full (100%) Offset Account
A full offset account offsets the entire balance against your loan. This is the most common type and offers the maximum interest-saving potential. It’s typically linked to a variable rate home loan and may come with a monthly or annual fee.
2. Partial Offset Account
A partial offset account offsets only a portion of the balance—for example, 50% or 70%. This means if you have $50,000 in a 50% partial offset, only $25,000 is deducted from your loan balance for interest calculation. Partial offsets are less common and may be offered with basic home loan products.
3. Fixed Rate Offset Account
Some lenders allow offset accounts on fixed rate loans, but often with restrictions. You might only be able to offset up to a certain amount (e.g., $30,000) or for a limited period. Fixed rate offsets are less flexible and may not provide the same level of savings as variable rate offsets.
Comparison Table: Offset Account Types
| Feature | Full Offset | Partial Offset | Fixed Rate Offset |
|---|---|---|---|
| Offset percentage | 100% | 50%-70% typically | Usually capped |
| Interest savings | Maximum | Reduced | Limited |
| Flexibility | High | Moderate | Low |
| Typical fees | Higher | Lower | Varies |
| Best for | Savers with high balances | Budget-conscious borrowers | Borrowers wanting fixed rate security |
Benefits of Using an Offset Account
Offset accounts offer a range of advantages beyond simple interest savings.
1. Tax-Free Interest Savings
The interest you save isn’t considered income, so it’s completely tax-free. This makes an offset account an attractive alternative to a savings account, where interest earned is taxable. For a homeowner in the 32.5% tax bracket, a 6% mortgage rate equates to a pre-tax return of about 8.89% on a savings account—far higher than most deposit rates.
2. Faster Loan Repayment
By reducing the interest charged, more of your repayment goes toward the principal. Over time, this can cut years off your loan term and save tens of thousands of dollars. For instance, on a $500,000 loan at 6% over 30 years, maintaining a $20,000 offset balance could save over $80,000 in interest and reduce the loan term by 4 years.
3. Flexibility and Liquidity
Unlike making extra repayments, funds in an offset account remain accessible. You can withdraw money for emergencies, renovations, or investments without needing to redraw or refinance. This liquidity is a key reason offset accounts are popular among Australian borrowers.
4. Potential Tax Benefits for Investors
For investment properties, using an offset account rather than paying down the loan can preserve tax-deductible debt. If you redraw funds for personal use, the interest on that portion may no longer be deductible. An offset account avoids this issue, as the loan balance remains unchanged.
Offset Account vs. Redraw Facility
Both offset accounts and redraw facilities can reduce interest, but they work differently and have distinct pros and cons.
- Offset Account: A separate account linked to your loan. Funds are yours to use anytime. Interest is calculated on the loan balance minus the offset balance.
- Redraw Facility: Allows you to access extra repayments you’ve made on your loan. You can withdraw these funds, but the process may involve fees or delays. Redraws are not available on all loans and may have minimum withdrawal amounts.
Key Differences
| Feature | Offset Account | Redraw Facility |
|---|---|---|
| Access to funds | Instant, via transaction account | May have delays, fees, or minimums |
| Interest calculation | Daily offset reduces interest | Interest reduced only on extra payments made |
| Tax implications | Better for investors (preserves loan deductibility) | Redrawing for personal use may affect deductibility |
| Fees | Often higher monthly/annual fees | Usually no ongoing fees |
| Suitability | Borrowers wanting flexibility and high savings | Borrowers focused on disciplined extra repayments |
For most owner-occupiers, an offset account provides greater flexibility. Investors, in particular, benefit from the tax treatment of offset accounts.
How to Maximize Savings with an Offset Account
To get the most out of your offset account, consider these strategies:
1. Deposit Your Salary Directly
Arrange for your salary to be paid into the offset account. Even if you transfer money out for expenses, the average balance over the month will be higher, maximizing interest savings.
2. Consolidate Savings
Instead of keeping savings in a separate account, pool them into the offset. This includes emergency funds, holiday savings, and even money set aside for tax bills.
3. Use a Credit Card for Daily Expenses
Pay for everyday purchases with a credit card and keep your cash in the offset until the credit card bill is due. This strategy keeps your offset balance high for most of the month, but requires discipline to avoid interest on the credit card.
4. Link Multiple Accounts
Some lenders allow multiple offset accounts linked to one loan. You can use separate accounts for different savings goals while still offsetting interest.
5. Avoid Unnecessary Withdrawals
Treat your offset account like a savings account. Frequent withdrawals reduce the average balance and erode interest savings.
Eligibility and How to Set Up an Offset Account
Most lenders require you to have a variable rate home loan to qualify for a full offset account. Some basic or low-rate loans may not offer offset, or only offer partial offset. Setting up an offset account is usually straightforward:
- Check your loan eligibility: Confirm your loan product supports offset. If not, you may need to refinance or switch products.
- Apply with your lender: Many lenders allow you to open an offset account during the loan application or add one later.
- Link the account: The lender will link the offset account to your loan. You’ll receive account details and can start using it immediately.
- Review fees: Offset accounts often come with package fees (e.g., $395 per year) or monthly account-keeping fees. Ensure the interest savings outweigh the costs.
Things to Watch Out For
- Fees: A $10 monthly fee might negate savings if your offset balance is low.
- Interest rate: Some loans with offset may have a higher interest rate than basic loans. Compare the effective rate after offset savings.
- Deposit limits: Some fixed rate offsets cap the offset amount.
- Tax advice: Consult a tax professional if using an offset for an investment property.
Real-World Example: How Much Can You Save?
Let’s look at a typical scenario. Assume a $600,000 home loan at 6.00% p.a. over 30 years, with an offset balance of $40,000 maintained throughout the loan.
- Without offset: Total interest paid over 30 years = $695,000 (approx.)
- With $40,000 offset: Interest calculated on $560,000. Total interest = $647,000 (approx.)
- Savings: $48,000 in interest and the loan is paid off 3 years earlier.
Using a mortgage offset calculator can help you estimate your own savings based on your loan amount, rate, and offset balance.
FAQ
1. Is an offset account better than making extra repayments?
It depends on your goals. Extra repayments permanently reduce your loan balance and can’t be easily accessed, while an offset account gives you flexibility. For disciplined savers who want liquidity, an offset is often better. For those who want to lock in savings and avoid temptation, extra repayments may be preferable.
2. Can I have an offset account on a fixed rate loan?
Some lenders offer partial or capped offset on fixed rate loans. However, full 100% offset is typically only available with variable rate loans. Check with your lender for specific products.
3. Does an offset account reduce my monthly repayments?
Usually not. Your minimum repayment remains the same, but more of it goes toward the principal, reducing the loan term. Some lenders may recalculate repayments if you request it.
4. Are offset accounts worth the fees?
It depends on your offset balance. If the interest saved exceeds the fees, it’s worth it. For example, a $395 annual fee requires an average offset balance of about $6,600 at 6% interest to break even. Higher balances yield net savings.
5. Can I have multiple offset accounts?
Yes, many lenders allow multiple offset accounts linked to one loan. This can help you organize savings for different purposes while still reducing interest.
References
- Australian Securities and Investments Commission (ASIC) – MoneySmart: “Offset accounts and redraw facilities” (2024). https://moneysmart.gov.au/home-loans/offset-accounts-and-redraw-facilities
- Reserve Bank of Australia – “Household and Business Finances” data (2025). https://www.rba.gov.au/statistics/tables/
- Australian Taxation Office – “Rental properties – interest deductions” (2024). https://www.ato.gov.au/individuals-and-families/investments-and-assets/rental-properties/rental-property-expenses/interest-expenses
- Canstar – “Offset accounts vs redraw: Which is better?” (2025). https://www.canstar.com.au/home-loans/offset-account-vs-redraw/
- Mortgage Choice – “What is a mortgage offset account?” (2025). https://www.mortgagechoice.com.au/home-loans/features/offset-account/