You can add tax on an order in Moon POS easily by following the steps below.

1. Open the Moon POS application on your device or tap on this link
2. Go to POS ➜ Menu, click on New Order on your right-hand side.
3. On the order screen, click the six-dot icon (⋮⋮) on the right-hand side and enable the toggle for the tax rate you want to apply.
4. Click on Save to apply the changes.
5. Once selected, the tax will be automatically applied to the order.