Sales tax on donation products
By default, donations don't normally attract a sales tax.
If you wish to charge sales tax on your DonateMate products, visit Settings to activate this.
Go to Shopify Admin > Apps > DonateMate > Settings, and select Add Sales Tax to Donation products. Click Save
Sales tax is automatically calculated by Shopify. For more information, visit https://help.shopify.com/en/manual/taxes/location-based