Income and adjustments that cannot be entered directly on Form 1040-NR are reported on Schedule 1 of Form 1040. For your Self-Employment, you should use Schedule C to to determine your "effectively connected income and expenses" and report this amount on line 3 of Schedule 1 (Form 1040). This amount is then reported on line 10 of Form 1040-NR. If your are not subject to self-employment tax, you do not need to file Form SE. @Sam Hopi
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