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Paying for someone's health insurance does not make them a dependent.

If you are legally married and living together you can only file as Married Filing Jointly or Marrried Filing Separately.  You can never claim a spouse as a dependent.  You should file as MFJ even if one spouse has little or no income.  You receive the highest standard deduction of $12,700 and you each receive a personal exemption of $4,050

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