i filed my tax for 2012 only for 1099G and unemployment (i have received unemployement compensation till May 2012). i forgot i had income of $3,800 in August 2012 as i didnt receive 1099-misc. IRS sent me a letter that this income was not reported. This was commission i provided a service as business consultant. when i filed my tax, i didnt have any 1099-misc income, i didnt claim any business expenses deductions.
is it ok to attach schedule c for my business expenses deduction as well as 1040x to amend? my expenses are easily go up to $3,800 as I went to Japan to conduct this service (no per diem was reimbursed from the company i provided a service) and I want to report per diem + some non reimbursed mileage, office supplies, tel / internet expenses. at the end, my tax has no change. but i need to pay interest...? that is shown on the letter they sent. It was only $30.00 or so... Please advise me....