Setup of Non Taxable Customer - Best practice?

If a customer is not taxable, is it best practice to set the tax group to Exempt, Nontaxable or just leave the field Blank? (If customer provides a tax exempt certificate, I would assign them to exempt, but what if they have not supplied a certificate?)

Or should a Nontaxable code be setup with the state they are in, for example New York - Nontaxable?

Thanks for any input!

I believe leaving the tax field blank may some time gives wrong impression that you missed the data entry. I prefer setting up the “non-taxable”.

I think just having a tax code as “Nontaxable” is fine instead of having the state. I can use the code for all the customers regardless of the city they are.