If SSI or Social Security (which are not the same thing) is your ONLY income, you are not required to file a tax return at all unless you have a 1095A for marketplace health insurance. If you have a SSA1099 for Social Security benefits AND you have other income from working, retirement accounts, investment income, etc.etc. etc., then you may need to file a a tax return.
You need to file a federal return if half your Social Security plus your other income is $25,000 when filing single or head of household, or $32,000 when filing married filing jointly, $0 if you are filing married filing separately.
Who has to file?
http://www.irs.gov/uac/Do-I-Need-to-File-a-Tax-Return%3F
WHAT IS THE DIFFERENCE BETWEEN SOCIAL SECURITY BENEFITS AND SSI?
https://www.ssa.gov/ssi/text-over-ussi.htm
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