That's a really good question. That would depend on if you have a tax exempt account. If not, then there'll be a tax charge with the purchase.
Hey, magenta5450845! Mike is correct, but I wanted to offer a little clarification -- with a regular EIP, you'll pay the full tax on the device up front. With a JUMP! On Demand lease, you'll pay the tax on the down payment up front, and then see tax monthly on the lease installments on your bill. Unless, as Mike said, you have a tax-exempt account, in which case -- lucky you!