- Make sure you are logged in with your admin account
- Go to Settings > Admin > Store settings
- Edit your Sales Tax % and select whether you want the tax to be inclusive or on top of product prices
- You can also add a secondary and tertiary tax below this. For example an Environmental Tax.
- Press Update button below
After setting your tax rate you will be able to specify if certain products are tax exempt using the checkboxes on the Settings->Products page