Tax Exemption

[photox]

Hi, all.

I am trying to create either a "script" or a "calculation" but, I have forgotton how to do such and was hoping someone could help.

I would like to create a Tax Exemption "text" which relates to the Tax Number (7%). What I mean is that I have an set amount lets say $1.00 and the tax calculated is .07 totalling $1.07, but, if I entered a tax exemption number, than that $0.07 is now $0.00 because of the tax exemption.

How would I go about doing such.

Thanks.

[comment]

Try:

Tax =

Amount * TaxRate * IsEmpty ( Tax Exemption )