I've tried searching and posting on the reward point thread, and contacting one of the original coders of the mod, to no avail.

Do I need to update code that calculates tax to take reward points in to account?

Sub-Total : £20.00
Reward Points : -£10.00
VAT @ 20% : £4.00
Total £14.00


It should obviously be a total of £12 and with a VAT total of £2 where am I going wrong?