You don't always get paid--a lot of programs require 2-3 semesters of TA duty, even if you don't need the funding. That said, I found teaching to be pretty fun

You don't always get paid--a lot of programs require 2-3 semesters of TA duty, even if you don't need the funding. That said, I found teaching to be pretty fun and helpful in solidifying my own understanding so it was helpful (but I'm sure the school also likes the free labor).