I just tried this and something has not worked for some reason.
I have edited the invoice.php (override) so that the tax column is headed GST instead of Tax and I have edited the Invoice Number to include the word Tax in front of it (a tax office rule) - nothing else. This new store will have Australian customers only so there will be no sales where GST is not applied.
On a test order I get this:
Total (ex) Total (inc)
$230.00 $253.00
Sub-Total: $253.00
Zones Table Rate (1 x 6.00kg) (Best Way): $13.20
GST (10%) + GST (10%): $24.20
Total: $266.20
Any idea why the GST (10%) part is repeating - even though it is calculating correctly, it looks like it is being added twice (it isnt) which I think might be confusing.
I have tried editing the tax description as you suggest but what I enter in there is not being displayed in my invoice. Any suggestions on this ??
However, for Australia, your suggestion is maybe not so good as businesses will have an ABN number but not be registered for the GST. A tax invoice needs to show GST being collected (if applicable) and the ABN number. I prefer this to be near my store address so my work-around solution works best for me rather than having it near the tax calculations within the invoice. It would be easier to have it as a separate display setting (on/off set in admin) hence my suggestion as it is involved with tax but not exactly IS tax IYKWIM.
cheers
Leah
(new store not live)