Vendors charge sales tax on Payment Vouchers. Unless you have a Status tax exemption and purchase from a vendor on Reservation land.
When I first signed up with Public Mobile no tax was charged on the account at any time. I purchased a $100 Payment Voucher, it became a $100 balance on my PM Self-Serve account, I chose a $90/90-day plan, and $90 was then deducted from my balance. No taxes were explicitly charged by PM at any time.
But when I recently signed a couple friends up with Public Mobile, taxes were charged when their accounts were activated. So a $120/90-day plan actually cost something like $135.60, at least the first time. (As a side note, PM offered different payment options but - at the time, anyways - would not allow mixed or combined payments and would not allow multiple Payment Vouchers, and this was a bit of a hassle when the largest Payment Voucher denomination was $100.)
I've since renewed my 90-day plan twice and haven't been charged any taxes. I'm not sure if my friends will pay taxes since their 90-day plans haven't yet been renewed.
