Sec. 52 Special rules
(a) Controlled group of corporations. For purposes of this subpart, all employees of all corporations which are members of the same controlled group of corporations shall be treated as employed by a single employer. In any such case, the credit (if any) determined under section 51(a) with respect to each such member shall be its proportionate share of the wages giving rise to such credit. For purposes of this subsection, the term "controlled group of corporations" has the meaning given to such term by section 1563(a), except that--
(b) Employees of partnerships, proprietorships, etc., which are under common control. For purposes of this subpart, under regulations prescribed by the Secretary--
(1) all employees of trades or business (whether or not incorporated) which are under common control shall be treated as employed by a single employer, and
The regulations prescribed under this subsection shall be based on principles similar to the principles which apply in the case of subsection (a).
(c) Tax-exempt organizations.
(1) In general. No credit shall be allowed under section 38 for any work opportunity credit determined under this subpart to any organization (other than a cooperative described in section 521) which is exempt from income tax under this chapter.
(2) Credit made available to qualified tax-exempt organizations employing qualified veterans. For credit against payroll taxes for employment of qualified veterans by qualified tax-exempt organizations, see section 3111(e).
(d) Estates and trusts. In the case of an estate or trust--
(1) the amount of the credit determined under this subpart for any taxable year shall be apportioned between the estate or trust and the beneficiaries on the basis of the income of the estate or trust allocable to each, and
(e) Limitations with respect to certain persons. Under regulations prescribed by the Secretary, in the case of--
rules similar to the rules provided in subsections (e) and (h) of section 46 (as in effect on the day before the date of the enactment of the Revenue Reconciliation Act of 1990) shall apply in determining the amount of the credit under this subpart.