Tax Exempt options help you waive sales tax for customers who are certified exempt. These override automatic calculations and help to track certification and exempt status.
Automatic calculations, using a Tax Status or service like TaxJar, may determine that no sales tax is collected because a transaction is out-of-state or items are non-taxable.
Tax Exempt applies to taxable transactions where tax is calculated and would normally be collected, but overrides so no sales tax is collected for the customer who is exempt.