K1 worksheet estates and trust is source income

[Dhughe3]

How is us source income calculated on box 14B?  We have searched everywhere regarding how this value is calculated and can find it. It is the one thing holding up our filing. Very frustrated with turbo tax.  We have a very small amount of foreign income as passive income (under $300).

[DavidD66]

Line 14b of a (1041) K-1 is for Foreign Tax.   js this what you are referring to?  What worksheet are you referring to.  Can you clarify what you are asking and/or what you are trying to do.