The memo summarizes the requirements for a valid consent as follows:
To be valid, an agreement by the taxpayer to extend the statute of limitations on assessment must be (1) in writing; (2) entered into before the expiration of the original collection period or a previously agreed upon extension; and (3) executed by the taxpayer and an authorized delegate of the Commissioner. I.R.C. § 6502(a); Treas. Reg. § 301.6502-1(a)(2)(i). In an Action on Decision regarding Rohde v. United States, 415 F.2d 695 (9th Cir. 1969), the Service acceded that, under applicable Treasury Regulations, the Commissioner (or his delegate) must counter-sign a waiver form prior to the expiration of the period of limitations for the waiver to be effective. AOD-1973-442, 1973 WL 35098 (IRS AOD). Although Rohde only addressed the validity of a waiver of the six-year period of limitations on collection after assessment, the AOD states that the signature requirement also applies to extensions of time for the assessment of income tax (i.e. Form 872). Id.This requirement of valid signatures by the taxpayer and the IRS within the open period of limitations applies to the types of consents tax controversy practitioners usually deal with - such as most prominently the regular Form 872, here. We recommend that taxpayers check their consents to make sure that they are signed by a person with proper authority.