Coupons & Tax [RESOLVED]

[b3n]

Couldn't find anything relevant with my search skills, but this seems too glaring an issue to not have come up before so I apologise if it's been discussed already.

Basically, I'm trying to figure out why Coupons dno't quite work as I'd expect; for example, an item costs £5 and is subject to 20% VAT, making a total of £6. If I add this item to the basket and then apply a coupon with a discount value of £6, only £5 is deducted, leaving the £1 (of tax) as a payable balance.

Is this intentional? Is it to do with a modification that has been made to this shop specifically? (running 7.0.5)

Any insights would be greatly appreciated, thanks.

[jmestep]

It could be because in some states in the US, if not all, sales tax is charged on the total amount of the purchase before deducting anything that might be considered a payment. In other words, the total of products in the order.

[b3n]

Ahh, I didn't know that, thanks jmestep. I've managed to put together a new TaxProvider that works the way I need now; couldn't find any other way round it, for anyone else having the same issue.