It depends. It's usually reported on a supplemental disclosure form or on a k-3 if you have it. If you know how much your total gross income is and how much gross income is sourced at the beneficiary level-US Sourced income, Foreign Source Income is automatically calculated in this section.
Other than this, there is no calculation on your part that must be done. The information must be disclosed somewhere in order for you to complete your return.
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