Wrong state on W-2/state returns
I'm seeking some guidance on a situation involving the incorrect state reported on a W-2 and on state returns. In 2016 an employee was in a branch location in IL instead of where he actually worked, OH. Everything for 2016 for him was filed under IL. He called to let us know he just caught that and now he owes the state of OH and is expecting a refund from IL. Considering the employee did not realize the issue until 2 years later and also that the payroll team now is entirely new so we can't speak to why he was put in IL, do we still need to issue a W-2C for 2016 and also amend our returns for those two states for the 2 quarters he was employed here in 2016?