Payee underreporting defined
For purposes of this section, there has been payee underreporting if for any taxable year the Secretary determines that—
(A) the payee failed to include in his return of tax under chapter 1 for such year any portion of a reportable interest or dividend payment required to be shown on such return, or
(B) the payee may be required to file a return for such year and to include a reportable interest or dividend payment in such return, but failed to file such return.