Tax Exempt for WooCommerce provides you a proper system through which you can give tax exemption to selected customers and user roles. the tax will be

WooCommerce Tax Exempt Features

• Allow all or selected user roles to claim tax exemption
• Display tax exemption form in “my account”
• Customize form fields
• Display tax exemption status in “my account” – pending, rejected or approved
• Review submitted tax exemption requests from the back-office
• Approve or disapprove tax exemption requests
• Add expiry date for tax exemption
• Allow guest users to claim tax exemption
• Grand tax exemption status to selected customers and user roles from the back-office (no need to submit tax info)
• Display tax exemption detail in admin order detail page, customers order detail page, and order email
• Customizable email notifications for admin and customer