According to Tax  Prof, in the case of Jellen v. Commissioner, the U.S. tax court ruled that unclear instructions  from the IRS is not a valid excuse for a taxpayers mistake. Check out  a quote from the ruling below.
Petitioner's only argument is that respondent's  instructions and guidance to taxpayers as to the taxability of Social  Security benefits are confusing and unclear and therefore that the Social  Security disability benefits he received in 2004 and 2005 should not  be subject to taxation under section 86(a).
