31.3406(a)-3—Scope and extent of accounts subject to backup withholding.
A payor who is required to withhold under § 31.3406(a)-1 must withhold—
(b)
On the accounts subject to withholding under § 31.3406(a)-1(b)(1)(ii) or (b)(2)(i), as described under § 31.3406(d)-5 (relating to notification of incorrect TIN) or § 31.3406(c)-1 (relating to notified payee underreporting), respectively.