I have several tax related questions concerning short term capital gains added to my yearly income. I am in Iraq, and I will qualify for the IRS tax free break on the first $91,400 earned, due to the 330 days out of US. Between me and my wife, we will both contribute our max to our 401K’s, which will shelter an additional $33,000. Our remaining taxable income will be around $35,000. Can anyone tell me what percentage my taxable income will be taxed at? Does the IRS look at our total earned income for our tax percentage bracket or only at the taxable amount? We file jointly and we have three kids to claim. Do I need to show a loss in my trading to benefit from not being taxed heavily? Do I need to pay Quarterly Estimated Tax to avoid penalty? I’m having all tax withheld currently.