Your 2017 Form W-2 will include wages that your employer paid
to you in 2017. It's very common
that you have wages included on your 2017 W-2 for work performed at the tail
end of 2016, if you were paid in 2017 for your 2016 labor. The key is the date that you were paid, not
the dates that you performed the labor.
Several items can be included in the Wages box (box 1) of your Form
W-2... besides just wages, your employer
can include tips, prizes and other compensation, and even taxable fringe
benefits, if you received any.
