Aussie Firebug

Financial Independence Retire Early

Credit Card Trick To Knock Off Thousands From Your Interest Repayments

Credit Card Trick To Knock Off Thousands From Your Interest Repayments

SHOUT-OUT: This post was inspired by reddit user ‘CallMeSobriquet’ who wrote a great piece on /r/fiaustralia


If you have a home loan in Australia at the moment, odds are your interest rate is sitting anywhere between 4-6%.

As I’ve already mentioned before in how much does it really cost to buy a house, interest repayments for a loan over 25+ years can sometimes cost more than the actual house.

Ain’t that some shit?


There are a few ways you can lower the costs of interest repayments:

  • Refinance to another bank at the lower interest rate
  • Pay off the loan quicker
  • Dump money into an offset account

What’s an offset account? Basically an account that reduces the principal that the banks calculate the interest repayments on.

Say you have a loan for $100K and the interest rate was 7%

You would have to pay $7K in interest every year.

If you had the same loan and interest rate but also had an offset account with $20K sitting in it, the banks would calculate your interest repayments in the following way:

Loan amount ($100K) minus offset ($20K) * 7% =  $5,600

You essentially saved $1,400 bucks of interest repayments by just having your spare cash ($20K) sitting in the offset account.



Enter Credit Card Tarting/Stoozing

Some credit cards in Australia have the ability to transfer the balance (usually up to 80% of the credit limit) to another banking institution without a fee.

This is relatively unique to Australia and whilst I have read some other country being able to do it, it seems like most banks overseas won’t allow you to.

Credit card tarting/credit card stoozing is where you basically use a credit limit that has a 0% interest free period and dump that amount into your offset account to lower your interest repayments on your home loan.

Here’s a break down on how it works:

  • Open a low or zero fee credit card with a financial institution different to the main bank where you hold your home mortgage loan and mortgage offset account. You also need an existing credit card with your main bank.
  • When applying, ask for the largest credit limit they’ll give you.
  • Immediately balance transfer the maximum amount to your CC in your main bank, and then internally transfer this to your mortgage offset account.
  • Set up an automatic monthly payment from your mortgage offset account to the new credit card for the minimum repayment amount the card requires (usually 2% of the current balance).
  • You’ve now effectively got yourself a fee-free one-year loan at 0% interest, which you are using to offset (tax free) your mortgage!!!
  • One month before the interest-free period on the balance transfer expires, transfer the entire amount back from your mortgage offset account to the new credit card, and either (a) close the CC account, or (b) ring the bank and ask them to give you a new 0% balance transfer on the same card.
  • Wash, rinse, repeat.


How Much Could This Actually Save You?

Imagine that you and your partner both applied for CC’s with a max credit limit of $50K on each.

Following the strategy you both transfer 80% of the combined balance ($80K) into the offset account that is offsetting your home loan of $400K that currently has an interest rate of 7%.

Without the offset you would be paying $28K in interest every year

With the extra $80K offsetting your loan you would now be paying $22.4K in interest!!!

That’s $5,400 dollars every year in interest repayments saved without paying a cent!

And who said there’s no such thing as a free lunch?


Things To Be Aware Of

  • This strategy works best if you have a home loan. You could transfer the money into a high savings account and make money instead of saving it on interest repayments. But the interest rate on a HISA is lower than a home loan and you would have to pay tax on money earn’t so it’s not as effective.
  • Need to be earning a high income and have good credit rating. The bigger the limit is on your CC the better. And to get a big limit you usually have to be a high income earner with little debt already.
  • This may affect your credit rating! This is a big one. Applying for too many CC’s can negatively affect your credit rating which could affect your ability to get credit in the future such as home loans.
  • MUST STAY ON TOP OF THE GAME! If you stuff something up like not reading the fine print on balance transfers or missing your interest only period this strategy can very quickly cost you more than it saves you. You must  be on top of everything. Not that hard to do but the banks are aware of credit tarting and the only reason they allow it is because they have statistical data that says that even though this is possible, odds are that the majority of people won’t have the discipline to stick to the plan and will end up paying more in fees than they save.
    Have you ever wondered why CC’s offer big sign up bonuses for free even if you cancel the card straight away? What’s the catch right? There is no catch, they just have the data that verifies that the majority of people are not financially savvy enough to stick to their budgets and they will most likely blow out their spending of their CC and incur CC interest fees which is where the banks clean up! They would much rather be charging you 22% (CC rate) interest than 7% (home loan rate) and are willing to give out freebies (CC sign up bonuses) in order to suck you into the trap.


Credit card tarting can be an easy way to ‘beat the system’ and knock thousands off your interest repayments, but to the undisciplined home owner who is not prepared to strictly stick by the plan it can end up costing you more than what it’s worth…
Photo credit: Sean MacEntee via / CC BY

7 Responses to Credit Card Trick To Knock Off Thousands From Your Interest Repayments

  1. Specifically in relation to ‘Sticking to the plan’, a big risk is that there is $30,000 sitting in your offset account, tempting you every day for 12-18 months.

    The temptation of all that cash just sitting there can be hard to resist sometimes.

    Also, if an ’emergency’ comes up, part of the $30,000 might be spent on that expense.

    • Yep defiantly.

      And that’s what the bank play on. They know that smart and disciplined people can ‘cheat’ their system but for every 1 person who does this, there are 1000 others who don’t pay off their CC in time and incur the fees.

  2. I was intrigued by this and just applied for a St George credit card. They are currently offering 18 months interest free on balance transfer. (Best offer found through compare not sure if the transfer will work as our credit card is with a different bank to the mortgage, but calculated that we could have the card sitting in credit and pay our monthly spend into the mortgage offset instead until it reaches the 30k balance transfer limit. Not as efficient but I am considering this an experiment that worst case scenario is that I save $1000, and might go as high as $2000. Thanks!

  3. Hello Aussie Firebug!

    Thanks for all your awesome blog posts and podcasts – my girlfriend and I are very big fans 🙂

    I have a quick question about credit card applications and credit ratings. People frequently guard against cancelling credit cards and applying for new ones, arguing that the credit checks performed when opening a new card damages your credit rating.

    Given that I know you like to take advantage of credit card bonuses and open cards a number of times a year, do you know if any of this is having an impact on your credit rating?

    Thanks in advance – and again, thank-you so much for your blog and podcasts. Your enthusiasm is infectious!


    Price Crusher

    • Hi Price Crusher,

      I’m glad you and your girlfriend have been enjoying the blog 🙂

      I can only speak from my own experiences, but I have not had any issues with my credit ratings from opening and closing over 5 CC’s during the last 5 years. It does make it annoying if I was to go for a loan or withdraw equity. But since I’m looking at ETF’s moving forward it’s not going to affect me as much. As long as you pay off your card each month you should be good.

      If I knew I was going to be applying for a loan within 12 months. I’d probably close the CC and wait until the loan was approved but that’s it.

      Hope that helps.

      • Thanks Aussie Firebug! That ceetainly makes sense. I am happy to be credit card free at the moment but could be swayed if I saw an opportunity too good to refuse.

Leave a reply


Nothing on this site is legal financial advice only the opinion and thoughts of an anonymous blogger. Always seek a licensed professionals advice when dealing with personal finance

Copyright © 2015 Aussie Firebug

Australian FIRE Calculator
Send it!
Get Calculator!
Join My Mailing List
Join over 1,000 others who get FREE Aussie Firebug updates, tips and tricks, and exclusive content!
No spam. Unsubscribe anytime.