Tax Q&A: Refinancing and claiming mortgage interest

By Contributor | 30 Oct 2019

Q: We plan to move out of our principal place of residence in about 12 months, after which we will rent it out. We want to refinance this year to release some equity so we can purchase a caravan and finance holidays.

My question is: if we refinance now while we’re still living in the property and then later rent it out, can we still claim the mortgage interest on the whole loan, or only part of it? 

Thanks, Claudia

A: A common question for investment property owners is the relationship between types of borrowings, the security for those borrowings, and tax deductions. The general principle is that interest is a tax deduction to the extent that it relates to borrowings used to acquire income-producing assets.

If you borrow money solely for the purchase of an investment property, the interest on the loan will be 100% tax deductible. However, if the property is rented out for half the year and used privately for the other half, the “extent” of the income-producing purpose is 50% and you can claim 50% of the interest on the loan.

It is only the purpose of the borrowings that determines income tax deductibility. The legislation does not consider the security for those borrowings, or what the fi nancier has called the loan. You could have a loan solely to purchase an investment property, which is secured by the family home and called a home loan by the fi nancier. This loan would still have interest that is 100% tax deductible, as only the purpose of the borrowing is taken into account.

The same principle applies to the situation you have outlined. You are contemplating new borrowings that will be for a private purpose. The fact that those borrowings will be added to a loan used to buy an income-producing property is irrelevant. Deductibility is determined by the extent of borrowings used for the acquisition of the property. The additional borrowings for a caravan and a holiday are not for a deductible purpose, so that part of the interest will not be tax deductible.

If you proceed as you have proposed, your loan will not be entirely for investment purposes, with the benefit of 100% tax deductible interest when the property is rented out. A calculation will instead need to be done to determine the extent of your deductible borrowings, which is the percentage of the loan balance before the private draw-down to the total loan amount afterwards. The interest on this percentage will be tax deductible. 

Aside from the impact on your tax deductions, you might reflect on whether it is desirable to have longterm borrowings to finance a holiday and a depreciating asset. There is some merit to aligning the length of your borrowings with the life of the asset being acquired. Car loans are typically three to fi ve years for this reason. Another thought is whether you really want to use up your equity, which you could use for real estate purchases, when other forms of finance that don’t do that are available for your private expenditure.

Need to know

  • The purpose of borrowings is what determines income tax deductibility.
  • Deductibility is related to the extent that the borrowings are used to acquire an income producing property.
  • There is some merit in aligning the length of borrowings with the life of the asset being acquired.

Daniel Rands
is partner at PKF Chartered
Accountants and Business
Advisers Tasmania

Have you got tax queries regarding your property investments and wealth creation strategies? Our experts are on hand to answer them.
If you would like your tax question answered in our magazine or on our website, please email your question to:

Top Suburbs : geelong west , alderley , sunshine , alexandra hills , lockridge


Get help with your investment property

Do you need help finding the right loan for your investment?

When investing in property, it is important to make sure that you not only have the lowest available rate that you can get, but also have the correct loan features for your needs.

Just fill in a few details below and we'll then arrange for a local mortgage broker to contact you and work out what features or types of loans are right for your needs. We'll even help with the paperwork. Plus an appointment is free.

How soon would you like a mortgage?
What is your Annual Household Income i $
Do you currently own any Investment Properties?
Do you own your own residence?
How much equity do you have in all your current properties?
First Name
Last Name
Where do you live?
What number can we reach you on?
E-mail address
We value your privacy and treat all your information seriously - you can check out our privacy policy here