Shafmaster v. United States, 707 F.3d 130

1994 personal income tax liability; IRS audited 1993-1998 with large deficiencies and penalties totaling over $14 million.
2001 Tax Court stipulations for 1993-1995; 1994 penalty for late filing noted, but no explicit failure-to-pay penalty waiver.
2001–2002 Stay of collection; Form 3552 balance due issued; dispute over whether six-month stay prevented balance due notice.
2003 carryback adjustments reducing 1994 liability; Form 870-AD and installment agreement used, but penalty waiver not stated.
2004 installment plan (Form 433-D) required payment of taxes plus penalties and interest; 2005 Brown letter acknowledged accrual of failure-to-pay penalties.
2006 penalty assessment of $261,189.50; 2007 full payment of 1994 tax; 2008 administrative refund claim denied; 2009 district court suit filed seeking refund and equitable relief.
2011–2012 district court summary judgments; focus on equitable estoppel, reasonable cause, and notice-and-demand issues; final appellate affirmation of government’s summary judgment.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether equitable estoppel against the IRS lies in this informal settlement context.	Shafmasters—equitable estoppel due to oral promises by IRS agents.	IRS not bound by informal settlements; no definite misrepresentation.	Equitable estoppel fails; no affirmative misconduct proved.
Whether reasonable cause excused failure to pay within 10 days.	Relying on promises to delay collection constitutes reasonable cause.	No inability to pay or undue hardship proven; argument is repackaging of estoppel.	No reasonable cause; penalty stands.
Whether the October 7, 2002 Notice of Tax Lien satisfied notice and demand requirements.	Notice did not properly demand payment and may have been inaccurate.	Notice complied with statute; lien itself contained demand language and consequences.	Notice and demand satisfied; lien valid for accrual.
Whether earlier September 2001 notices could toll or relate back to the 2002 penalty.	Premature penalty assessment based on earlier, potentially improper notices.	Relation back acceptable; accrual timing supported by later notices and plan.	Relation back proper; accrual timing valid.
Whether the government’s notice and demand timing invalidates the penalty claim.	Prematurity or improper notice undermines penalty accrual.	Proper notices issued; penalties accrue if not timely paid.	Notice timing not fatal; penalty valid.

Botany Worsted Mills v. United States, 278 U.S. 282 (U.S. 1929) (informal settlements not binding; estoppel possible in limited circumstances)
United States v. Roccio, 981 F.2d 587 (1st Cir. 1992) (notice practice not requiring a specific form)
Ramírez-Carlo v. United States, 496 F.3d 41 (1st Cir. 2007) (affirmative misconduct required for estoppel)
Dickow v. United States, 654 F.3d 144 (1st Cir. 2011) (affirmative misconduct requirement reaffirmed)
Heckler v. Cmty. Health Servs., 467 U.S. 51 (Supreme Court 1984) (definition of willful neglect; required showing for reasonable cause)
U.S. v. Boyle, 469 U.S. 241 (Supreme Court 1985) (reasonable cause standard for reliance on payment)
Simon v. Comm'r of Internal Revenue, 248 F.2d 869 (8th Cir. 1957) (carryback does not relieve due date payment duty)
Manning v. Seeley Tube & Box Co. of N.J., 338 U.S. 561 (1950) (carryback does not cancel duty to pay interest)
Rev. Rul. 72-484, 1972-2 C.B. 638 (N/A) (carryback does not affect penalties)