How much tax and fees are being added to the data plans? If I purchase the $20/month 1 GB Verizon plan or the $25/month Att plan, what is the final bill for the month?

I am on the Verizon $20/mo plan and my bill each month is exactly $20.

I've never paid tax or fees on the AT&T data plan. Price is as advertised.

AT&T charges a few dollars on Postpaid data plans but does not charge any tax or fees on Prepaid plans.