How would you go about setting the GST for an item where it is not obvious what the GST portions are. For example I have a phone bill that has a total of $249.37 and under it, there is a GST charge of $20.40. The GST in Australia is 10%, however, any of the calculations i do cannot work out what portion of the charges are actually gst free and which are (this has a credit card fee of $5.55)
Is there a way to manually set the GST amount without having it as a %, yet still allow it to show up in the BAS.
Thanks
Brad