The term payor has the meaning set forth in §§31.3406(a)-2 and 1.6049-4(a)(2) and generally includes a withholding agent.
§ 31.3406(a)-2 Definition of payor.
(a) In general. Payor means the person that is required to make an information return under section 6041, 6041A(a), 6042, 6044, 6045, 6049, 6050A, 6050N, or 6050W with respect to any reportable payment (as described in section 3406(b)), or that is described in paragraph (b) of this section.
(b) Persons treated as payors. The following persons are treated as payors for purposes of section 3406—
(1) A grantor trust established after December 31, 1995, all of which is owned by two or more grantors (treating for this purpose spouses filing a joint return as one grantor);
(2) A grantor trust with ten or more grantors established on or after January 1, 1984 but before January 1, 1996;
(3) A common trust fund; and
(4) A partnership or an S corporation that makes a reportable payment.
§1.6049-4(a)(2) Definition of payor.
For payments made after December 31, 2002, a payor is a person described in paragraph (a)(2)(i) or (ii) of this section.
(i) Every person who makes a payment of the type and of the amount subject to reporting under this section (or under an applicable section under this chapter) to any other person during a calendar year.
(ii) Every person who collects on behalf of another person payments of the type and of the amount subject to reporting under this section (or under an applicable section under this chapter), or who otherwise acts as a middleman (as defined in paragraph (f)(4) of this section) with respect to such payment.