Media Release

730,000 interest-only mortgages a ticking time bomb

        • 730,000 interest-only loans expiring in 2020
        • Repayments to increase by $3,600 per year on average
        • Benefits and risks of interest-only loans

25 February 2020, Sydney, Australia – Hundreds of thousands of borrowers on interest-only loans will be hit with higher repayments this year according to new research by Finder, Australia's most visited comparison site.

A Finder analysis of Australian Prudential Regulation Authority (APRA) data revealed that 730,000 interest-only home loans will convert to principal and interest loans in 2020.

Of all the home loans granted in 2015-2016, a worrying 39% ($295 billion) were interest-only (IO).

Graham Cooke, insights manager at Finder, said that borrowers on IO loans need to financially prepare for their interest-only period to expire.

"Interest only home loans allow borrowers to only repay the interest portion of their mortgage for a set period of time, usually between three and five years.

"This means repayments tend to be lower because you're only paying off the interest on your loan, rather than the principal as well.

"But borrowers can be hit hard once their mortgage converts to principal and interest, as their repayments can increase significantly. If you know your IO loan is expiring this year, it's important to factor this into your budget," Cooke said.

If the average loan size during the 2015-2016 period was $395,000, interest-only borrowers can expect to pay an extra of $3,600 per year if forced onto a standard variable loan with an interest rate of 4.80%.

Owner-occupiers or investors who borrowed above the $395,000 average could be hit even harder, with the increased cost for a million-dollar loan clocking in at $789 per week, or $9,468 annually.

Cooke said that interest-only borrowers don't need to stick with the same lender once their loan converts.

"If your interest-only loan is due to expire in the coming months, start comparing your options now. There are hundreds of principal and interest loan products to choose from.

"Banks will sometimes offer a discounted variable rate on a case-by-case basis in a bid to keep your business. It's therefore worth negotiating with your lender for the biggest rate discount you can get.

"The lowest rate available on Finder is currently 2.84%, and there are more than a dozen variable home loans that start with a "2". If your current lender can't match this, there's no need to stick around," advised Cooke.

Extra cost per month for a principal and interest loan

Loan sizeMonthly interest only repayments (based on 5.35%)Monthly principal and interest repayments (based on 4.80%)Extra cost per month

Source: Finder

Risks and benefits of interest-only loans

  • Benefit: lower repayments. IO repayments are cheaper at first, which can help if you're struggling to make ends meet. But this won't last forever, so be prepared for your payments to increase.
  • Benefit: high-growth investment. IO loans are popular with property investors. You can buy a property, make low interest repayments, watch the property increase in value, then sell at a profit.
  • Risk: no equity. If your property doesn't increase in value, you won't get much benefit on an interest-only loan. You may even end up with negative equity.
  • Risk: reverting. Once the interest-only period expires, your payments will increase once they revert to principal and interest. This can take a big toll on the household budget.


For further information


The information in this release is accurate as of the date published, but rates, fees and other product features may have changed. Please see updated product information on's review pages for the current correct values.

About Finder

Every month 2.6 million unique visitors turn to Finder to save money and time, and to make important life choices. We compare virtually everything from credit cards, phone plans, health insurance, travel deals and much more.

Our free service is 100% independently-owned by three Australians: Fred Schebesta, Frank Restuccia and Jeremy Cabral. Since launching in 2006, Finder has helped Aussies find what they need from 1,800+ brands across 100+ categories.

We continue to expand and launch around the globe, and now have offices in Australia, the United States, the United Kingdom, Canada, Poland and the Philippines. For further information visit

12.6 million average unique monthly audience (June- September 2019), Nielsen Digital Panel

Go to site