Setting a Master Service List item as 'Taxable' is easy:

FROM THE WEB APP
Step 1: Go to Settings > Master Service List
Step 2: Click on an item in your master service list.
Step 3: Select the 'This item is taxable' box.
Step 4: Save


FROM THE MOBILE APP
Step 1: Tap on Menu > Settings > Master Service List
Step 2: Tap on an item in your master service list.
Step 3: Tap "This item is taxable".
Step 4: Save

