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"...the one income under $12000 does not file correct?..."
No, Not correct.
MFS must file a tax return if gross income was more than $5.00.
If you file separately and you lived with your spouse anytime during 2018 then up to 85% of Social Security can be taxable.
https://www.irs.gov/pub/irs-pdf/p17.pdf page 21.
https://www.irs.gov/pub/irs-pdf/p17.pdf page 21.
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