I am starting a project that will allow CiviCRM to support the needs of an Australian non-profit. This non-profit is subject to the Australian Goods & Services Tax rules (GST) for some but not all transactions.
The GST requirements apply whenever the non-profit provides a tangible good or service in exchange for a payment. This is most common with their dinners, selling DVDs, and items from their gift shop.
I have written up the requirements and possible approaches on the CiviCRM wiki at:
http://wiki.civicrm.org/confluence/display/CRMDOC41/Taxes+and+Fees+for+CiviCRM
I would love to get feedback from anyone who would like to participate or later use the new module.
- Sarah