Solved
Social Security says they don't send an SSA 1099 for people who get SSI (here: https://faq.ssa.gov/link/portal/34011/34019/article/3706/how-can-i-get-a-form-ssa-1099-1042s-social-security-benefit-statement). What am I supposed to do with that section, then?
SSI (Supplemental Security Income) is welfare and is not taxable. It is not entered anywhere on your tax return. It is not the same as social security benefits (either retirement or disability) which is reported on an SSA-1099 and is potentially taxable.
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