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Do I owe taxes if my deductions are higher than my income?
No, it's not possible. Even if you had no deduction or credits, your federal tax on $16,604 would be: $9075 @ 10% = $907.50 +  $7529 @ 15% = $1129.35 = $2036.85 That assumes you are filing as single. There must be more to the story.  Typo in your income numbers?  Also, what do you mean by a self-employment tax deduction? Maybe update your question to include a breakdown of everything you entered? Edit: As noted in Loren's answer, it seems that it is indeed possible in at least one case (self-employment taxes).