I have been doing some research on the internet into the USA tax system for the self employed. I have a friend in Nevada. I work in the UK system every day but I am not sure if things like taxable deductions for costs are the same here and there. Also I believe there is an extra tax for the self employed but that half of this is reclaimable. I am also not sure if paying into Medicare via tax will entitle my friend to medical treatment as he curently thinks he doesnt qualify. Any help appreciated or even a link to a decent website.