Can this tax problem work with Zen Cart?

Hi everyone,

I've been trying to do this for over a fortnight now. It's just not working, and I wonder if I'm missing something?

Basically there's two types of customers - retail and wholesale. Retail customers need to see their price including tax at all times from start to finish. It's important that any tax is included in the price - even as a guest.

Wholesale customers should see an excluding tax price throughout, and see a line at the end of their checkout which details the amount of tax being added on.

To get dual pricing I'm using that mod which works fine. With various settings I can get it to work on retail, and not wholesale and visa versa.

Also, when ever I have the tax enabled on a product the ex VAT appears when someone turns up as a guest. I don't know if this can be worked around?

Put simply, my idea is to not use tax settings on products. Insert an if statement in to functions_taxes.php to do one action or another based on the customer. So, if retail do nothing, have only one price including tax and use that.

If a wholesale customer add a tax as per usual - will this be called if tax isn't set up on a product?

Any ideas are much appreciated!

Thanks in advance.