Translation questions

I am one of the Dutch GTE staff, and have discussions about “class” you use this word in combination with “Tax” What is the intention of that, beacuse the translator suggests to translatie it into “tarief”. But that is a different original. Is it the “rate” you refer to, or is it indeed a VAT class (software term)
Also there is a term in “excluded” which is used differently:
“Products excluded” and the single term “excluded” One of those is in my opinion referring to the product, but the other I am not sure of
So please alter the term “class” into “rate” and both terms “Excluded” into “Exclusive” , “Included” into “Inclusive” if those terms are related to VAT

Thanks for your help

Peter