@rwom1217 wrote:
When you say voluntary, does that mean it isn't legally required?
It is legally required, but Arizona has not created a specific form to collect the tax. You must declare and pay it yourself.
Other states have made the declaration part of their state tax return, and have created a "safe harbor" formula so that if you pay what they estimate for you, they won't come after you for more if it turns out you made more un-taxed purchases than they estimated.
