It's hard to tell. If you had a split on your city withholding then that means part of your income was in/for City A ad the other part for City B. It would have affected your either your state and/or your city taxes depending on where you live and how they handle local taxes. You'll need to review your state/city returns to determine whether or not you'll need to amend them. If you have additional questions about how to deal with the change/correction of your city tax, please post a new question.
