A change to the GST rate.
We don't need it in at the moment, but I had some old JIWA 6 breakout code to address this from the last GST rate change here in NZ:
When copying a sales order or quote, if there has been a change in the GST rate since the source document was created, then the new document should get the new GST rate.
Ideally, GST should be a bit like currency - have a table of 'Start Date', 'End Date' and 'Rate'.
But given the slow rate of GST rate change, it might be easier be to add a 'Start Date', 'End Date' and 'Replacement TaxID' field. So if a tax code has 'expired', you can look up its replacement - in a kind of linked-list.
| Description | Rate | Effective From | Effective Until | Replaced By |
| GST In (10%) | 10.00 | 2000-01-01 | 2003-12-31 | GST In (12.5%) |
| GST In (12.5%) | 12.50 | 2004-01-01 | 2009-12-31 | GST In (15%) |
| GST In (15%) | 15.00 | 2010-01-01 |
(note: not the actual dates
)
