Q. What should I do?
A. Make quarterly estimated payments to Springfield. It is very common that Ohio employers will only withhold for the work location city.
See: https://springfieldohio.gov/city_services/general-tax-information/
https://springfieldohio.gov/city_services/2024-income-tax-filing-information/
Springfield will give you a credit, when you file your tax return, for half the tax you paid to Union through withholding. So, you can reduce your quarterly payments by that much.
