Work-location state tax
Most states tax wages earned within their borders, regardless of where the employee lives. If you physically perform work in a state, that state can tax those wages. You usually file a non-resident return there at year-end.
Convenience-of-employer rule
New York, Connecticut, Delaware, Nebraska and Pennsylvania (in some scenarios) apply this rule. Even if you work remotely from another state, if it is for the employer's convenience and not your own necessity, the employer's state can still tax you. New York is the most aggressive.
You moved but did not update payroll
If you moved states and did not tell payroll, your employer continues withholding for the old state. Update your residence address with HR or payroll immediately.
Reciprocity not applied
If your state and the work state have a reciprocity agreement (PA-NJ for some, IL-IN, MD-VA), you can usually file an exemption form so payroll only withholds for your residence state. If you did not file the exemption, both states show on your stub.
What to do
- Confirm your residence address with payroll.
- Ask which state(s) they are withholding for and why.
- If reciprocity applies, file the exemption form.
- If you moved mid-year, file part-year resident returns in both states.
- Talk to a CPA if you have multi-state work or income.