When it comes to abatement of penalties regarding late filing of international information returns, the voluntary disclosure system adopted by the I.R.S. in its Delinquent International Information Return Submission Procedures suggests that penalties may be assessed but that there is a procedure to have them abated. In practice, penalties always seem to be assessed and the standard that must be met in order to have them abated is high. Reasonable cause from the viewpoint of a taxpayer need not be reasonable when reviewed by an I.R.S. Appeals Officer. Wooyoung Lee looks at the decided cases and the approaches taken by the I.R.S. to reduce penalties without fully abating them. He also comments on the facts of a case that has been filed in U.S. District Court challenging the apparent policy of mitigation rather than full abatement.