Were you divorced by the end of 2017? If so you can file Single for 2017. As for the 2016 joint return: Your 2016 tax return shows your 2016 Adjusted Gross Income (AGI) If you filed a joint return then the AGI is the same for each of you.
Form 1040EZ line 4
Form 1040A line 21
Form 1040 line 37
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