It has occurred to me that it might be beneficial to add tax on a per-product rather than a per-cart basis.

The reason for this are 2 fold:

1. that different types of products can attract different tax rates
2. it makes sending tax information to some payment gateways simpler

Additionally, I think perhaps a control panel option to indicate whether prices are entered into the products weblog with or without tax. Then again, this may be better served simply by the creation of a custom field - then tax can be turned on and off at will on a per product basis.

Good request. Moved to feature requests for now.

As a workaround I did a quick reverse calculation to send the proper amounts to SagePay.
For UK VAT at 17.5% the calculation is:

(gross price * 7) / 47 = net price

So at the moment, it’s not possible to have products with different tax rates?
I’m selling t-shirts for adults and kids, but kids clothing is rated at 0%, while adults is at 17.5%.

How would I achieve this?

IC360, you can set items to “no_tax” when you add them to the cart.

http://cartthrob.com/docs/tags_detail/add_to_cart_form/#par_no_tax

I currently have something very rough, but it does work for our case, if anyone is interested I can share.

Please share H&O

This would be great, H&O. In Germany we have different tax rates depending on the product. Maybe this will help until cartthrob 2.1 is released. I’m a designer and not that much into developing, so I would be glad to not end up with some really hacky selfmade solution.