Every tax carries its official code, and it is frozen onto the document
In VIA ERP a tax isn’t a rate on its own. It carries its official code, its category and the level it applies at, and that whole set is copied onto the line at the moment the invoice is issued.
The day a rate changes, your old documents don’t move: they keep the code and the rate that were applied to them, with the date they were applied on. That is exactly what electronic filing will ask of a three-year-old invoice.
- 01 Tax configured
official code, rate, category
- 02 Invoice line
the tax applies
- 03 Issue
code, rate and date copied onto the document
- 04 Three years on
the document still states what was applied
A rate change doesn’t rewrite your history.