To sum up the proceedings in a slightly snarky but completely fair way:
- The taxpayer files a petition for review of a tax deficiency, along with a motion to dismiss that same petition for lack of jurisdiction.
- The IRS files an opposition to the taxpayer's motion to dismiss for lack of jurisdiction, along with a motion to dismiss for lack of jurisdiction.
- The taxpayer opposed the IRS's motion to dismiss for lack of jurisdiction, and insists that the petition should be dismissed for lack of jurisdiction.
- The Tax Court denies the taxpayer's motion to dismiss for lack of jurisdiction, grants the IRS's motion to dismiss for lack of jurisdiction, and dismisses the case for lack of jurisdiction.
- The resulting order determines the rights of the parties.
- The IRS issues a notice of deficiency and mails it to a certain address.
- The taxpayer doesn't challenge within the 90-day window, either because they didn't receive the notice, or because they received it and blew it off.
- The taxpayer then files a petition with the Tax Court, saying "I know this petition is late, but the notice of deficiency was sent to the wrong address, which means that it's not valid. So you should dismiss on the grounds that the notice of deficiency was invalid, which means that you don't have jurisdiction, but which also means that the IRS can't collect until they issue another notice properly."
- The IRS files a response that says "The notice was sent to the right address and so it's valid. The taxpayer's petition is late and you should dismiss on those grounds, which means that you don't have jurisdiction, but which also means that we can go ahead and collect."
- The Tax Court sides with the IRS (or in other cases with the taxpayer), finds that the petition was late (or that the notice was invalid), and dismisses for lack of jurisdiction.