I have written several times on the Wartime Suspension of Limitations Act (“WSLA”), 18 U.S.C. § 3287, here. In part relevant to tax crimes, the WSLA suspends “the running of any statute of limitations applicable to any offense involving fraud or attempted fraud against the United States or any agency thereof in any manner, whether by conspiracy or not.” (Cleaned up.) The statute of limitations is suspended from the date of the “specific authorization for the use of the Armed Forces until 5 years after the termination of hostilities as proclaimed by a Presidential proclamation, with notice to Congress, or by a concurrent resolution of Congress.” (Cleaned up.)
Where the WSLA is applicable, there are several authorizations that might establish the starting point for the suspensions. Authorizations that have never been revoked were passed in 2001 and 2002 related to the activity after the 9/11 event. So, for purposes of this discussion, I assume that the WSLA authorizes tax crimes prosecutions with the general 6-year statute of limitations for conduct back to 1995 or 1996 and the statute continues until 5 years after the authorizations are terminated.
Caveat: There could be even earlier starting dates under the WSLA for earlier authorizations not yet revoked: (1) a 1991 authorization incident to the Gulf “War”; and (2) a 1957 authorization (although it might not meet the “specific authorization” required by the WSLA. Matthew Waxman, Remembering Eisenhower’s Middle East Force Resolution (LawFare 3/9/19), here. The House has recently passed resolutions to revoke these authorizations. See Karoun Demirjian, House votes to repeal military authorizations dating to Gulf War, Cold War (WAPO 6/29/21), here.
I have stated my belief that tax evasion under § 7201 is within the literal language of the WSLA. That would mean also that the offense conspiracy to commit tax evasion would likely be within the literal language of the WSLA. (The defraud conspiracy, in my view, would not be within the WSLA because the defraud conspiracy for some strange reason does not require fraud per Hammerschmidt v. United States, 265 U.S. 182, 188 (1924); see John A. Townsend, Tax Obstruction Crimes: Is Making the IRS's Job Harder Enough, 9 Hous. Bus. & Tax. L.J. 255 (2009), here; I think (perhaps speculation) that if the crime’s elements do not include fraud in the traditional sense of the term (defraud conspiracy does not), the WSLA would not apply.)
However, for some reason as yet unnanounced, at least in recent memory, DOJ Tax has asserted only the traditional six-year tax crime statute of limitations. The CTM’s discussion of statutes of limitations does not even mention the WSLA. DOJ CTM 7.00 STATUTE OF LIMITATIONS, here. So how long DOJ Tax will forebear asserting the WSLA is open. Further, in cases where the defendant challenges the normal statute of limitations, a court might sua sponte invoke the WSLA to deny the challenges.