The only thing I seem to print these days is a yearly tax form or two. I don't even waste the space with a printer - I just go to 7/11 for my printing needs and pay a couple cents per page.
In the US very sensitive. Mostly because they contain all the personal information you would need to commit identity fraud. They also us information from prior year returns to positively identify you on subsequent years. ie: your AGI from last years form is used to verify your identity for the next year.
