Thinking About Turning Your Home Into an Investment? Don't Make This Costly Tax Mistake
- Trish Matusiak
- Jun 29
- 2 min read
Many Australians work hard to pay down their home loan as quickly as possible. But if you think you might one day turn your family home into an investment property, there is an important tax rule you should understand before making extra repayments.
The ATO Doesn't Care What Property Secures the Loan
One of the biggest misconceptions is that if you later rent out your home, you can simply redraw the extra repayments you've made and claim the interest as a tax deduction.
Unfortunately, it doesn't work that way. The Australian Taxation Office looks at the purpose of the borrowed funds, not the property that secures the loan.

Here's an Example
Let's say:
You buy your home with a $600,000 loan.
Over several years, you make extra repayments and reduce the loan to $400,000.
You then decide to move out and rent the property.
At the same time, you redraw $200,000 to use as the deposit on your new family home.
Many people assume the entire $600,000 loan is now tax deductible because the original property has become an investment.
It isn't.
The original $400,000 loan relating to the purchase of the rental property may remain deductible (subject to your personal circumstances).
However, the $200,000 redraw was used to purchase your new home. Because those borrowed funds were used for a private purpose, the interest on that portion is generally not tax deductible, even though it's secured against the investment property.
Why This Matters
This mistake can cost property owners thousands of dollars over the life of the loan.
Once money has been paid into a loan and later redrawn, the tax treatment depends on why that money was borrowed the second time, not why the original loan existed.
Planning Ahead Can Save You Thousands
If there's a chance you'll convert your home into an investment property in the future, it's worth getting advice before making large extra repayments.
In many situations, using an offset account instead of paying additional money directly into the loan can preserve flexibility. Money sitting in an offset account reduces the interest you pay today while allowing you to access your savings later without changing the purpose of the original home loan.
Every situation is different, and tax outcomes depend on your individual circumstances. Always seek advice from your accountant or tax adviser before implementing a strategy.
At Dash Finance, we work closely with your accountant to help structure your lending with both your current needs and future plans in mind.




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