(1) income derived from sources within any specified possession, and
(2) income effectively connected with the conduct of a trade or business by such individual within any specified possession.
(1) as a deduction from gross income any deductions (other than the deduction under section 151, relating to personal exemptions), or
(2) any credit,
For purposes of this section, the term “specified possession” means Guam, American Samoa, and the Northern Mariana Islands.
Amounts paid for services performed as an employee of the United States (or any agency thereof) shall be treated as not described in paragraph (1) or (2) of subsection (a).