Letter 3978 is a Supplemental Notice of Determination issued by the IRS Office of Appeals after a United States Tax Court case remands a Collection Due Process matter back to Appeals for further consideration. It is the formal document that closes the supplemental proceeding and gives you another opportunity to seek Tax Court review on the remanded issues.
Why a Remand Happens
Tax Court remands a CDP case when it finds that Appeals abused its discretion or failed to consider something properly, but is not ready to decide the ultimate collection outcome on the existing record. Rather than reverse outright, the court sends the case back for Appeals to do additional work: consider a new collection alternative, review additional financial information, address an argument that was overlooked, or verify compliance with a procedural requirement.
What Letter 3978 Contains
The letter explains the specific issues Appeals addressed on remand and the resulting determination. Compare it carefully against the original Notice of Determination (Letter 3193) and the Tax Court remand order. The supplemental determination should address what the court directed Appeals to reconsider.
Return to Tax Court
Letter 3978 does not restart the 30-day Tax Court petition clock. Instead, the case returns to the same Tax Court docket under the court's remand jurisdiction. The court then determines whether Appeals' supplemental work corrected the problem identified in the remand or whether further action is required. Procedural guidance here is specific; follow your tax attorney's directions on timing.
Why This Matters
A CDP case that reaches the Supplemental Notice of Determination stage is usually a serious case with meaningful amounts at stake. The procedural posture is unusual. Representation that understands both the Tax Court docket and the Appeals process is important at this stage.
If you received Letter 3978, call us at (813) 229-7100.