I pay about $12 for my line in taxes. I get a discount through work for 20% off (the data plan and rate plan...not off the unlimited texting option). My wife and brother in law (on my family plan) also get 20% off their data plans, but not the rate plans.
Before taxes I pay $102 per month. With taxes, it is about $117. My wife pays about $40 for her family line with iPhone, my brother in law pays about the same ($1 more, I am not sure why he has different fees and taxes), and my parents both pay $14 a month for their non-iPhone lines (with no data). So all together the bill comes to about $225 per month.