A way to alter Tax settings for logged in customers only?

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Hi all,

I am wondering if there are any changes I can make to the code which will allow me to add the tax to products automatically if you are a normal customer. But if your logged in with a certain tag it adds the tax in checkout. I've tried playing around with the IF and UNLESS function but I can't find where to put it or what to use. Hopefully someone can help? Thanks