# When do I call for tax?

Source: https://developer.avalara.com/avatax-for-vat/wqj0629548200981/

# When do I call for tax?

Learn when to call for tax during your workflow to optimize performance and accuracy.

When you call for tax depends on where you are in the workflow. As a best practice, don't call for tax every time a user adds or removes an item from the cart. Some implementations loop in an explicit Calculate Tax button, or they incorporate the tax calculation in the Save function. You can also call AvaTax for tax calculation upon receiving shipping information.