Notified payee underreporting
If—
(A) the Secretary determines with respect to any payee that there has been payee underreporting,
(B) at least 4 notices have been mailed by the Secretary to the payee (over a period of at least 120 days) with respect to the underreporting, and
(C) in the case of any payee who has filed a return for the taxable year, any deficiency of tax attributable to such failure has been assessed,
the Secretary may notify payors of reportable interest or dividend payments with respect to such payee of the requirement to deduct and withhold under subsection (a)(1)(C) (but not the reasons for the withholding under subsection (a)(1)(C)).