J1 visa holders are generally only entitled to the personal exemption which was $3800 in 2012. Income in excess of this is subject to federal income tax.
The state tax may not be recoverable. Depends on the state.
With the federal tax i looked at the instructions and it gave a table where you had to find you gross pay and then it showed the tax that was payable for that figure.
How does the 3800 exemption work. Has it been included in the table. Or do you subtract it from your gross pay and look for that figure, or if you go over 3800 does it apply.