How Do You File Taxes If You Worked in Multiple States?
Changing jobs mid-year, taking on remote work for an out-of-state employer, or relocating partway through the year can all leave someone staring at more than one state tax return come filing season.
The short answer
Generally, income is taxed by the state where it was earned and by the state where the person lives, which means someone who worked in more than one state during the year may need to file a resident return in their home state and one or more nonresident (or part-year resident) returns in the states where they worked. Most states offer a credit to prevent the same income from being taxed twice.
How income gets allocated across states
Each state return generally only taxes the portion of income connected to that state — wages earned while physically working there, for instance — rather than every dollar earned all year. Someone who moved partway through the year typically files as a part-year resident in both the old and new states, splitting income based on when the move occurred. Someone who kept a permanent home in one state but worked temporarily in another may instead file as a resident in one and a nonresident in the other, with different allocation rules depending on the state.
How the resident credit prevents double taxation
The resident state usually taxes all of a person’s income regardless of where it was earned, which on its own would create double taxation on income also taxed by a work state. To offset this, most states allow a credit for taxes paid to another state, applied on the resident return. The mechanics vary by state, and the credit generally can’t exceed what the resident state would have taxed on that same income, so it doesn’t always fully cancel out a difference in tax rates between the two states.
When reciprocity changes the picture
Some neighboring states have a state tax reciprocity agreement that lets a resident of one state who works in the other skip filing a nonresident return altogether, as long as the proper form is on file with their employer. Where reciprocity doesn’t apply, filing multiple returns and claiming the resident credit is the more typical path.
Common complications worth knowing about
- Withholding doesn’t always match reality. An employer may only withhold for one state even when work happens across state lines, which is closely related to what happens when withholding goes to the wrong state.
- Remote work adds its own wrinkles. Some states tax income based on where an employer is located rather than where the employee physically sits, which can create overlapping claims between two states.
- Filing status can differ by state. A filing status chosen for the federal return doesn’t automatically carry over identically to every state return, since state rules don’t always mirror federal ones.
- Deadlines can vary. Multiple state returns often mean multiple due dates and documentation requirements to track, rather than one unified deadline.
What to weigh
Filing in multiple states adds real complexity, but the underlying idea is fairly simple: income generally gets taxed once by the work state and once by the resident state, with a credit designed to prevent double taxation from being permanent. Because state tax rules vary widely and change over time, working through each state’s specific requirements — rather than assuming they all work the same way — tends to save the most confusion later.