The extension fee is calculated at 1% of the order value at checkout.
For example, a $600 order with a guaranteed interest free period of 3 months is extended to 6 months interest free.
1% of $600 is $6, this fee is then multiplied by the 3 month extension period, giving a total of $18.
The $18 extension fee will be split evenly across all instalments meaning you only pay an additional $3 per instalment if on a monthly schedule.
If you are on a fortnightly or weekly repayment, fees will be automatically adjusted to match the schedule.