You moved. Two states want a return.
The year you move to Utah is the one year your return is genuinely hard. Utah taxes what you earned after you got here, your old state taxes what came before, and the income that straddles the move date is where the money is won or lost.
The part-year year.
Utah is a flat 4.45% for tax year 2026, down from 4.5% for 2025, which makes the rate the easy part. The hard part is deciding what the rate applies to. A part-year resident files Form TC-40 with the TC-40B schedule attached, and TC-40B splits your year in two: Column A is Utah income, Column B is everything on the federal return. Get Column A wrong and the error scales through the whole calculation.
A few situations where this stops being a data-entry exercise:
- You moved to Utah partway through the year and have two W-2 states on one return
- Your old state is still withholding, or stopped withholding too early
- You kept the job and the employer never changed your work state
- RSUs vested after the move on a grant you earned somewhere else
- You sold the house you left behind
- A bonus or commission landed after the move for work you did before it
Both sides of the move.
Filing two state returns is not the same as filing one twice. The two have to be built from a single allocation, because each state reads what you told the other one.
The Utah part-year return
Form TC-40 with the TC-40B schedule, Column A built from where the income was actually earned rather than from a move date typed into software.
The departure-state return
The nonresident or part-year return for the state you left, filed to the same allocation as the Utah return so the two sides agree instead of contradicting each other.
Income allocation across the move
Wages, bonuses, commissions, RSU vests, deferred comp, and self-employment income assigned to the right side of the move date by the method each state actually applies.
Credit analysis
Whether the TC-40S credit for income tax paid to another state applies at all, and what it's capped at. For most clean moves the honest answer is that it does nothing, and knowing that early beats finding out in April.
Withholding and estimate reset
New Utah withholding at 4.45% for 2026, the old state's withholding shut off, and safe harbor estimates set so the first full Utah year doesn't arrive as a penalty.
Residency documentation
What to keep if the state you left comes back with questions. High-tax departure states audit this, and the file you build in year one is the file you defend with later.
The state you left still matters.
Utah's side of a part-year return is roughly the same work no matter where you moved from. The departure state is what changes, and some of them do not let go quietly.
From California
The biggest corridor into Utah, and the hardest exit. California taxes the part-year period on Form 540NR, computes the rate on your worldwide income, and keeps a claim on equity you earned there.
Kept a New York job
New York's convenience-of-the-employer rule taxes the whole paycheck as New York income even though you now work in Utah. Utah taxes it too, and the credit does not close the gap.
From Washington with RSUs
No income tax in Washington, so the vest schedule decides everything. Shares that vest after you land in Utah get taxed at Utah rates on income you earned while living somewhere that wouldn't have taxed it.
The part-year return itself
How TC-40B Column A and Column B work, what the Utah flat rate applies to, and why the credit for taxes paid to another state usually pays a part-year resident nothing.
No state line to stop at.
Most people search for a CPA, which is a fine instinct and a slightly wrong one for this particular problem. A CPA license is issued by a single state board. An Enrolled Agent is licensed federally by the Treasury and has unlimited rights to represent taxpayers before the IRS in every state, which is the credential that matches a return spanning two of them. If you want the longer version, we wrote it up at CPA vs EA.
The depth here comes from an odd corner of the practice. A large share of our clients are overemployed, running two or more full-time remote W-2 jobs at once, often for employers in three different states. That is the hardest multi-state return that exists: concurrent wages, competing withholding, duplicate Social Security tax, and convenience-rule states claiming the same dollars. A single move across one state line is a simpler version of a problem we work on all year. You can see the same math in our free overemployed tax estimator.
Ewan Morkel is an Enrolled Agent based in Mapleton, Utah, working with clients in Utah County, along the Wasatch Front, and in the states they moved from. If your situation is the recurring kind rather than the one-time kind, start at multi-state tax returns instead.
What people ask first.
- Do I have to file two state tax returns if I moved to Utah mid-year?
- Usually yes. You file a part-year return in Utah on Form TC-40 with the TC-40B schedule attached, and a nonresident or part-year return in the state you left, unless that state has no income tax. Texas, Nevada, Washington, Florida, Wyoming, South Dakota, Tennessee, Alaska, and New Hampshire have no tax on wage income, so a move from one of those means Utah is your only state return.
- What is Form TC-40B and do I need it?
- TC-40B is the Utah non and part-year resident schedule. Column A is your Utah income, meaning everything you earned from any source while you were a Utah resident plus any Utah-source income earned while you were not. Column B is your total income from all sources on the federal return. The ratio between them is what scales your Utah tax. Anyone who was a Utah resident for only part of the year needs it.
- Will Utah give me credit for the tax I already paid to my old state?
- Rarely, and this is the part that surprises people. The TC-40S credit for income tax paid to another state only covers income that both Utah and the other state taxed on the same dollars, which for a clean move is almost nothing: your old state taxes the months before, Utah taxes the months after. The credit matters when income overlaps the two, like a bonus paid after the move for work performed before it, or a remote job in a convenience-rule state.
- Is hiring someone for a part-year return actually worth it, or can software handle it?
- Software handles a clean W-2 move reasonably well. It handles income that straddles the move date badly, because it allocates from the dates you type in rather than from where the work was performed. RSUs vesting after the move on a grant earned before it, a bonus, deferred compensation, a home sale, and self-employment income are the items where the software answer and the correct answer diverge, sometimes by five figures.
- How does Utah decide when I actually became a resident?
- Utah Code §59-10-136 turns on domicile, which is where you have voluntarily fixed your habitation with the intention of making a permanent home. You are also a resident if you are not domiciled here but keep a permanent place of abode in Utah and spend 183 or more days of the year in the state, counting a day as one where you spent more time in Utah than in any other state. Utah Admin. Code R865-9I-2 lists the factors the Tax Commission weighs.
Get the first Utah year right.
Bring the move date, both states, and last year's return. Thirty minutes is enough to know what the part-year year costs and where the exposure sits.