Hello @EHT101 ,
You can toggle on and off sales taxes for your products in the store's settings, but there isn't really a way for customers to mark whether or not they're tax-exempt, let alone prove it through the store. You'd either need to charge taxes for everyone that checks out, or charge no one taxes.
You could charge taxes, and then send out an X% discount code specifically to email addresses of the institutions as a potential alternative.
If this store is predominantly available through a site built in the Website Builder, then you may wish to reach out to their support, to see if they have any additional insight regarding the online store and the automated sales text calculators.
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