nonqualified entity

(1) any foreign corporation unless substantially all of its income is—

(2) any partnership unless substantially all of its income is allocated to persons other than—

(1) any foreign corporation unless substantially all of its income is—

(A) effectively connected with the conduct of a trade or business in the United States, or

(B) subject to a comprehensive foreign income tax, and

(2) any partnership unless substantially all of its income is allocated to persons other than—

(A) foreign persons with respect to whom such income is not subject to a comprehensive foreign income tax, and

(B) organizations which are exempt from tax under this title.

(1) In general

If the amount of any compensation is not determinable at the time that such compensation is otherwise includible in gross income under subsection (a)—

(A) such amount shall be so includible in gross income when determinable, and

(B) the tax imposed under this chapter for the taxable year in which such compensation is includible in gross income shall be increased by the sum of—

(i) the amount of interest determined under paragraph (2), and

(ii) an amount equal to 20 percent of the amount of such compensation.

(2) Interest

For purposes of paragraph (1)(B)(i), the interest determined under this paragraph for any taxable year is the amount of interest at the underpayment rate under section 6621 plus 1 percentage point on the underpayments that would have occurred had the deferred compensation been includible in gross income for the taxable year in which first deferred or, if later, the first taxable year in which such deferred compensation is not subject to a substantial risk of forfeiture.

For purposes of this section—

(1) Substantial risk of forfeiture

(A) In general

The rights of a person to compensation shall be treated as subject to a substantial risk of forfeiture only if such person's rights to such compensation are conditioned upon the future performance of substantial services by any individual.

(B) Exception for compensation based on gain recognized on an investment asset

(i) In general

To the extent provided in regulations prescribed by the Secretary, if compensation is determined solely by reference to the amount of gain recognized on the disposition of an investment asset, such compensation shall be treated as subject to a substantial risk of forfeiture until the date of such disposition.

(ii) Investment asset