Take one of your existing credit cards and pay it off so it has a zero balance (call it "CARD #1").
Then apply for a low rate balance transfer credit card ("CARD #2") with a $20k limit and as part of the application, do a $15k balance transfer to CARD #1 (NB: Most cards only let you balance transfer up to a certain % of the card limit).
CARD #1 will then have a credit balance of $15k which you can then withdraw to your bank account (should be no cost) and you can then use the cash to pay the stamp duty.
You then have a $15k debt on CARD #2, but the Balance Transfer interest rate will be way cheaper than a personal loan and cheaper than paying the Stamp Duty by credit card at your Purchases interest rate.
There are a range of low rate balance transfer deals out there at the moment, from 0% for 9months to 5.9% for 24 months and various in between. See here:-
http://www.creditcard.com.au/balance-transfers/duration/desc
Really just up to you to work out how quickly you could clear the debt on CARD #2. If you think it will take longer than the balance transfer rate period, look for a balance transfer card that reverts to the PURCHASE interest rate, not the CASH ADVANCE rate at the end of the balance transfer rate period.
Good luck.
Awesome thinking Mike R. but credit card application scoring is very sensitive to recent credit file activity and a "real mortgage application" shortly before the credit card one would be a potential deal killer me thinks. Worth a shot perhaps.
An easier way would surely be to go with another lender, sounds like a deal to me and CBA are notorious for their harsh scoring of 95% deals. Suncorp or ING perhaps to name a few.
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