Most people discover multi-state tax the hard way: a W-2 arrives with two states in box 15, or a letter shows up from a state they left two years ago asking where their return is. If you moved this year, took a remote job with an out-of-state employer, or picked up a rental across a border, this is worth ten minutes now.
Residency isn't just where you sleep
States care about two different ideas, and they don't have to agree. Domicile is your true home: the place you intend to come back to. Statutory residency is colder math: keep a place to live in a state and spend more than a set number of days there (183 is the common line) and that state can treat you as a resident regardless of your intentions. Get careless and two states can both claim you as a resident in the same year. I've seen it, and it isn't fun to unwind.
The year you move
In a moving year, you generally file a part-year resident return in each state, splitting income by when you earned it. That sounds simple until real life shows up: the exact date your domicile changed, which side of the move your bonus landed on, how each state treats the capital gain you took in October. Keep records as you go: day counts, lease dates, when the family and the furniture actually moved. Those details decide the split.
Remote work and the convenience rule
The default rule is that wages are taxed where the work is physically performed. A handful of states (New York is the famous one) layer a convenience of the employer rule on top: if your job is based there and you're remote because you prefer it, rather than because the employer requires it, the state may tax the income anyway. Plenty of people take a remote role with a New York company, never set foot in the state, and still end up filing there.
The credit that mostly fixes it
Your home state usually gives you a credit for taxes paid to other states, and most of the time that kills the double tax. Not always. The credit is generally capped at your home state's rate on that income, so if you worked in a higher-tax state, the difference stays out of your pocket. Convenience-rule situations can leave gaps too.
One more wrinkle for anyone with equity comp: RSUs and options are typically sourced to where you worked while they vested. Move to Texas in June, and the shares that vest in December can still be partly taxable in the state you left.
Tell your CPA before the move or before you sign the remote offer. Not in April. Day counts, work locations, the date the moving truck actually showed up: those facts get set during the year, and there's no reconstructing them at filing time.
This article is general information, not tax, legal, or accounting advice, and reading it does not create a CPA-client relationship. Tax rules change and depend on your specific facts. Please consult a qualified professional about your situation before acting.