<prompt> Human: My wife and I just received a letter from the IRS today essentially notifying us that they adjusted our earned income by 40,000 and that we now owe them 11,000 by the 29th of July for the year 2013. What is happening!? We religiously track our earning and tax information and have never had issue with doing our taxes. There is absolutely no way we earned over 100,000 in 2013! What do we do?  <response>: Look over your 2013 tax return, to make sure there are no issues - maybe you hired someone who turned out to be completely incompetent to file your taxes?If everything looks good on your tax return, ask the IRS for the source of all the reported income, so you can find the discrepancy. Do this in writing. 