How to Set-up Sales Tax?
Your PayPal account processes your sales therefore tax settings should be applied via your PayPal account settings. Please consult PayPal help content on setting your account to charge taxes for your sales processed.
Please refer to this PayPal Help - https://www.paypal.com/al/cgi-bin/webscr?cmd=xpt/Marketing/shipping/EasyCalculateShipAndTax-outside