Ah, no problem! It seems like the tax logic is different in the edit sheet from when it is saved on the page. The below test case will produce you a 0.01 penny

Ah, no problem! It seems like the tax logic is different in the edit sheet from when it is saved on the page. The below test case will produce you a 0.01 penny tax pre-save, and a 0.00 penny tax post-save. If you click between them the value changes: Line item 1: £10, tax @ 0.04% Line item 2: £10, tax @ 0.04% Result pre-save (correct) is 1p Result post-save (incorrect) is 0p