Subpart F Love Machine 16 years ago Subpart F A category of unearned income from a foreign source, which is presently taxed by the IRS regardless of whether or not it is sent back to the United States. Random Finance Terms for the Letter S Structured Portfolio Strategy Structured Settlement Subject Subject to Opinion Subjective Probabilities Subordinated Debenture Bond Subordinated Debt Subordination Clause Subpart F Subperiod Return Recommended for you: Structured Settlement Subjective Probabilities Subject to Opinion Subordination Clause