Level 20
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Get your taxes done using TurboTax

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