Offset accounts are popular among mortgage holders for their potential to reduce interest payments, yet they come with tax implications that are crucial to understand, especially from an accounting perspective. In this blog, we explore how offset accounts function, their pros and cons, and, most importantly, the tax-related considerations accountants and financial decision-makers need to evaluate.
How Does an Offset Account Work?
An offset account is a transaction account linked to a home loan. Instead of earning interest, the account’s balance reduces the mortgage balance when calculating interest.
Example: With a $500,000 mortgage and $50,000 in an offset account, interest is calculated on $450,000 rather than the full loan amount.
Key Tax Consideration: While this structure reduces interest, which might otherwise be tax-deductible on investment properties, it is essential to maintain clear, purpose-driven transactions to avoid tax complications.
Need help structuring an offset account to protect tax deductions? Book a consultation with New Leaf Advisory today.
Offset Tax Aspects
1. Mixed-Use Funds: Preserving Interest Deductibility
One key tax issue with offset accounts is the risk of mixed-use funds—combining personal and business-related transactions. When personal funds are mixed with business-related or investment funds, it can dilute tax-deductibility on the interest saved through the offset account.
- Example: If an offset account linked to an investment mortgage includes funds used for personal expenses, the ATO may view this as reducing the investment purpose, limiting deductibility.
- Best Practice: Keep business and personal funds separate, ideally with a clear agreement at arm’s length, documenting fund usage to support deductibility.
Unsure if your offset account meets tax requirements? Speak to our team for tailored advice
2. Division 7A and Part IVA: Borrowing from a Company to Reduce Mortgage Interest
Offset accounts often involve funds sourced from a company to reduce mortgage interest. Division 7A and Part IVA of the tax law govern such arrangements to prevent misuse of company assets by shareholders.
- Division 7A: This rule applies when a company lends to a related party. If a loan from a company is used in an offset account to reduce personal mortgage interest, it should follow a complying loan agreement. Otherwise, the ATO may consider the loan as a taxable dividend.
- Part IVA: Intended to prevent tax avoidance, this rule could apply if the company’s loan to a related party appears structured mainly to gain a tax benefit. To avoid this, ensure that there are loan terms, and they are met. Ensure you document any salary, wages, or dividends that may apply to such loans, so they are declared as income when necessary.
Tip: Document salary, wages, or dividends where necessary, and consult a tax professional to minimise risk.
Offset Account Benefits
Offset accounts provide several significant benefits:
- Interest Savings: Reduce mortgage interest and save substantially over the loan’s lifetime.
- Flexible Access to Funds: Funds remain accessible for personal or business use.
- Potential Tax Benefits: When structured correctly, interest savings can remain tax-deductible for investment loans.
Example: Over a 30-year loan, an offset balance of $50,000 could save thousands in interest and reduce the loan term by several years.
Want to maximise your mortgage savings while maintaining tax efficiency? Contact us today.
Offset Account Disadvantages
While offset accounts offer many benefits, they are not for everyone. Here are some potential drawbacks:v
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Fees and Costs: Higher fees or interest rates may offset savings.
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Opportunity Costs: Funds do not earn interest elsewhere.
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Tax Complexity: Mixed-use funds and compliance with Division 7A add complexity
Pro Tip: When considering an offset account, weigh the savings on mortgage interest against potential account fees and the tax implications.
What is the Difference Between Redraw and Offset Accounts?
- Offset Account: Reduces mortgage interest by offsetting the mortgage balance but does not generate interest on the account balance.
- Redraw Facility: Allows repayment above the minimum mortgage amount, with the option to withdraw (redraw) funds as needed. The downside is less flexibility, as some lenders restrict redraws or charge fees for access.
- Tax Angle: Using redraws on investment loans can impact tax-deductibility differently than offsets. When redrawn funds are used for personal purposes, deductibility of interest may be lost.
- Which to Choose: Offset accounts tend to be more suitable for those needing flexible access to funds without affecting tax-deductibility on investment loans, while redraw facilities suit those focusing on faster mortgage repayment without immediate access needs.
Do Offset Accounts Earn Interest?
Funds in an offset account typically do not earn interest. Instead, their value lies in the reduction of mortgage interest. The key is to compare the potential savings in mortgage interest to what you might earn in a high-interest savings account, keeping in mind you have to account for the tax on any interest earnings in a savings account.
Example: If you save $2,000 in interest through an offset, but a high-interest savings account would yield only $1,500, the offset account remains the better choice.
Tax Tip: For investment properties, maximising the offset on interest expenses without impacting tax-deductibility offers a unique benefit that a traditional savings account can’t provide.
Is an Offset Account Worth It?
Deciding on an offset account should be based on both financial and tax factors:
- Advantages: For those with investment properties, offset accounts can yield significant tax advantages if structured properly. Savings over a mortgage’s lifetime can also be considerable.
- Drawbacks: For those with limited funds to keep in an offset account, the cost of maintaining such an account could outweigh the interest savings, especially on lower-balance mortgages.
- Ideal for Investors: When linked to an investment property loan, it enables potential tax deductions.
- Less Beneficial for Low-Balance Loans: In such cases, fees and limited savings might make standard savings accounts more appealing.
Making the Right Choice for Your Financial Future
Choosing an offset account is a nuanced decision that involves careful consideration of both financial goals and tax obligations. Here is a recap:
- Preserve Tax Benefits: Avoid mixed-use of offset funds to keep interest savings tax-deductible where applicable.
- Understand Division 7A and Part IVA: Loans from companies can be advantageous if structured correctly, but failing to comply risks costly tax implications.
- Weigh Costs vs. Savings: Higher fees for offset accounts mean they are only worthwhile when interest savings are substantial.
Connect with New Leaf Advisory: If you are considering an offset account, our team at New Leaf Advisory can provide tailored advice to help you understand how an offset fits into your tax strategy.

