This video will demo:
0:06 - Setting up sales tax on the global level
1:59 - Overriding tax on event level
2:46 - Setting up sales tax on merchandise only

NOTE: Tax is not calculated in the system, it is built into the price of the item (tax included) and then tax is shown on the final checkout page. If you'd like to add tax it must be added into the item price. If the item is $10 + 10% tax for example. the item price needs to be set to $11. To display the sales tax on receipts you must edit the sales tax percentage in SET UP > PROFILE > FEES.

NOTE: If tax is set up, service fees are including tax as well.