There's no known issue with line 4a of Form 8960.
However, it's important to realize that line 4 is populated with information from several sources.
According to Line 4a—Income From Passive Trades/Businesses, Rental Real Estate, Royalties, Partnerships, S Corporations, and Trusts in the Instructions for Form 8960:
Enter the following amount from your properly completed return.
- Schedule 1 (Form 1040), line 3.
- Schedule 1 (Form 1040), line 5.
- Form 1041, line 3.
- Form 1041, line 5.
- Form 1041-QFT, the portion of line 4 that’s income and loss that properly would be reported by a trust filing Form 1041 on Form 1041, line 5.
- Form 1040-NR, the amount properly reported on the attachment to your Form 1040-NR representing the amount that you would properly include on Schedule 1 (Form 1040), line 5, if you were filing Form 1040 or 1040‐SR and including income and loss only for your period of U.S. residency.
Please see the instructions linked above for more details.
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