How I handle it is that In the shipto state selection drop-down, I put an option, like, "MNtaxexempt".
I also add a message to the form about the tax exempt status and to support it they need to submit a completed certificate. Then, I provide a link to the .pdf tax exempt certificate for them to complete and either email it to me, print, complete, and fax or mail to me.
If they do not provide a tax exempt cert, and they selected the "MNtaxexempt", I add the tax back in and charge them that amount. Of course, I use the Offline gateway, so it makes it easier to add the tax back in and charge the full taxed amount.
HTH!
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God Bless!
Bonnie - AgoraCart Moderator
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