No, under the U.S. Internal Revenue Code, there would be no requirement that you be classed as a "taxpayer" in an action to enforce a summons. An IRS summons can be issued to anyone -- and validly enforced with respect to anyone -- regardless of whether that person is a "taxpayer" or not, or whether that person happens to be "the taxpayer" in that particular case.GaryBale wrote:.....The references from the Powell case refer to a "taxpayer" facing a heavy burden of proof if they wish to oppose an IRS application for enforcement of a summons, while the IRS are only required to produce an affidavit from an IRS agent. Marc Stevens would be objecting to the IRS claim that the defendant is a "taxpayer", but in the Powell case this has already been established. Perhaps is seems odd to question that, but if we imagine the IRS brought a case against me (I've never worked in the US) the case should never reach a point where I could be classed as a "taxpayer".
Further, the term "taxpayer" as used in the Internal Revenue Code essentially means a person who is "subject to" a U.S. internal revenue tax. Everyone on the Planet Earth is potentially "subject to" U.S. internal revenue taxes -- even a monk living on top of a mountain in Tibet who has never been an U.S. citizen or U.S. resident, and who has never visited the U.S. It's a peculiar feature of U.S. law.
If the U.S. government claims that someone owes a U.S. internal revenue tax, that person will not get far in a U.S. court by arguing that he is not "the taxpayer" with respect to that court proceeding, unless he is claiming that the case is one of mistaken identity (such as "My name is John Smith, but I'm not the same John Smith that the government is talking about; it's a different John Smith").