RSU State Tax After a Move: How One Engineer Owed Two States

RSU State Tax After a Move: How One Engineer Owed Two States

Illustrative anonymized composite, drawn from recurring patterns rather than a single engagement. No person or employer described is real, and the firm named below was not involved. Every figure is made up for illustration. Nothing here is guaranteed or predictive.

RSU state tax after a move rarely arrives as one clean bill. In this composite, a software engineer changed states midway through a multi-year vesting schedule, kept vesting shares, and learned the next spring that her new employer's payroll had withheld for the new state only. The state she had left still wanted its share of the income she earned while she lived and worked there.

A firm to ask about this kind of situation is Doug Johnson CPA, a Los Angeles firm that lists Equity Compensation among its specialties. Doug Johnson CPA is a vetted Sam's List member and a paying member of our featured program; payment does not buy the language we use or its reviews. It is covered near the end. The story comes first.

The Engineer Behind This RSU State Tax After a Move

Our composite engineer accepted a transfer within her company and moved to a new state in the middle of the year. She held restricted stock units her employer had granted while she lived in the old state, on a multi-year schedule, and they kept vesting after the move. She had never filed in two states in one year and assumed her new payroll provider would sort it out.

She sold enough shares at each vest to cover withholding and kept the rest. The first vest after the move looked like any other: a line on her pay stub, a smaller net share count and a vest that looked like any other on the stub. Nothing on the stub said "ask your accountant about your old state."

The limitation: this is one composite, and a move can look very different depending on the states involved, the dates, the type of equity and where the work was performed. Nothing here describes what any particular state does.

Why Payroll Withheld for One State Only

Payroll systems generally withhold based on where an employee lives and works now. On the day of the vest, the engineer lived in the new state, so the employer withheld for the new state on the whole vest. The old state was not in the picture, because from payroll's view she no longer had a connection to it.

That is a common gap, not an error by the employer. Withholding is an estimate made with the information on file. It does not decide what is owed. The final answer comes from the returns, and the returns can ask a different question: how much of this income did each state have a claim to?

Some states look to the period over which the equity was earned, not just the date it vested. Under that kind of approach, the part of a vest tied to time spent living or working in the state can be treated as income of that state, even if the shares vested after the person left. Whether a given state does this, and how it counts the time, differs. Check each state's rules.

The limitation: a short withholding is not a sign that anything was done wrong, and a correct withholding is not a sign that the return will match. The two can diverge in either direction.

Multi-State Equity Compensation: How the Income Gets Split

With multi-state equity compensation, the central question is allocation. Some states allocate equity pay across the period from grant to vest, which means that a single vest can be divided between states based on the share of that period spent in each. Other states use different methods, and some use none that is easy to summarize. Federal tax follows its own rules and is a separate matter from state allocation.

In our composite, one vest was the focus. The numbers below are made up and are not rates or rules from any state.

Item (all figures made up)	Amount
Value of the vest at the vest date	$90,000
Months from grant to vest	36
Months of that period in the old state	24
Share the old state treats as earned there	$60,000
Share earned after the move	$30,000
State withholding taken, new state only	$4,500
State withholding taken, old state	$0

The old state's share was two thirds of the vest on these made-up months, and none of it had any tax withheld. The new state had withheld on the full $90,000, and the old state never saw the vest at all.

The limitation: a split by months is a simplified illustration. A real allocation can depend on where the work was done, how the grant was structured, how the state counts days and whether it follows grant-to-vest at all. The CPA who prepares the returns decides the method, and a state's own rules control.

Filing a Part-Year Resident Return in Each State

For the year of the move, the engineer needed a part-year resident return in each state. A part-year resident return generally covers the part of the year a person lived in that state, and it may also pick up income from sources in that state for the rest of the year. Her old state's return reported income from the months she lived there, plus the share of the vest the state treated as earned there. Her new state's return reported income from her residency months onward.

Each part-year resident return asks for dates: when the move happened, when residency changed and sometimes where she worked on which days. That is the paperwork she did not expect. Moving dates, a lease, a start date and payroll records all became evidence, and she was glad she had saved them.

The returns also had to line up with each other and with her federal return. Income that one state allocated to itself could not be ignored by the other, and the credit discussed below depends on getting that right.

The limitation: part-year resident filing rules, residency tests and the definition of source income differ by state. Do not assume a return in one state works as a model for another, and do not assume that a move date on a lease is the only date a state will look at.

The Credit for Taxes Paid to Another State, and Its Limit

When two states tax the same income, many states allow a credit for tax paid to another state. In general, that credit cannot exceed the tax the credit-giving state imposes on that same income. If the other state's tax is higher, the extra generally is not refunded by the credit. So double tax can remain even when everything was filed correctly.

In the composite, the new state taxed her as a resident on the full vest, and the old state taxed the $60,000 it treated as earned there. The new state allowed a credit for tax paid to the old state, but only up to what the new state itself charged on that same $60,000.

Item (all figures made up)	Old state	New state
Tax on the income that state taxes	$3,400 (on $60,000)	$4,500 (on $90,000)
New state's tax on the same $60,000	n/a	$3,000
Credit for tax paid to the old state	$0	$3,000
Tax after credit	$3,400	$1,500
Withholding and payments made	$0	$4,500
Result before penalty	$3,400 due	$3,000 refund

On these made-up numbers, the old state charged $3,400 but the credit was capped at $3,000, the new state's tax on the same income. The $400 difference was double tax that the credit did not remove.

The limitation: credit rules differ. Some states restrict which kinds of income qualify, some require particular forms and some limit the credit based on how the other state's tax was computed. A credit is a reduction, not a refund of everything paid twice, and it can be reduced to zero by its own limit.

RSU State Tax After a Move: Where the Balance Due and Refund Landed

The engineer owed $3,400 to her old state and expected a $3,000 refund from her new state. The refund was real money, but it was not an offset. Each state processes its own return, and the refund was paid on the new state's timetable while the balance was due on the old state's deadline.

There was one more line. Because no tax had been withheld for the old state and she had made no estimated payments to it, the old state's return could carry an underpayment penalty for the year. On the made-up figures, that penalty was $100. The new state had been paid too much, and the old state too little, and the penalty followed the old state's shortfall, not the net.

Made-up outcome	Amount
Balance due, old state	$3,400
Underpayment penalty, old state	$100
Refund, new state	$3,000
Net cash out of pocket, once the refund arrives	$500

The limitation: the net figure is only a simple subtraction of made-up amounts. Timing, interest, the penalty method and any federal effects were not modeled, and a real return could come out better or worse.

A Balanced Outcome, Not a Promised One

The result was not a clean win. The engineer paid money to a state she had left, waited for a refund from the state she had joined and absorbed a small penalty because withholding had been short. She also paid a CPA to prepare two part-year returns and to document the allocation. She did not have to pay twice on all of it, because the credit carried part of the load, but she paid twice on some.

What she changed afterward was practical. For later vests, she asked her CPA to estimate the old state's likely share before the next vest and to check whether estimated payments made sense. She also set aside part of each vest rather than treating the net share count as hers to spend.

Another engineer with the same facts could do better or worse. A different move date, a different pair of states, a different grant structure or an earlier conversation with a CPA would change the result. Nothing in this composite predicts what a given person will find, and the advice from a CPA who has the actual documents controls.

Where Doug Johnson CPA Fits for Multi-State RSU Questions

Doug Johnson CPA is based in Los Angeles, serves clients nationwide and was founded in 2024. It has 3 employees and lists minimums of $250,000 in income and $250,000 in revenue. Its live profile positions the firm for growing businesses with $250,000 to $10 million in revenue and for high earners with equity compensation, and lists Equity Compensation, Growing Companies and HENRYs (High Earners, Not Rich Yet) as specialties.

For someone in the engineer's position, the equity compensation specialty is the relevant part: RSU vests, withholding gaps and how they show up at filing. A person with a similar situation could bring the vest schedule, grant dates, pay stubs and moving dates to a first conversation.

Doug Johnson CPA has 15 verified client reviews on Sam's List as of 2026-11-03. Each review is submitted by an individual who identifies as a client of the firm and rates it on communication, subject-matter knowledge, and overall satisfaction. Reviews reflect those individual experiences and do not represent an endorsement by Sam's List. Doug Johnson CPA is a paying member of our featured program, and payment does not buy its reviews. Ratings and rankings are not indicative of future performance or results.

The limitation, plainly: the profile does not name multi-state returns, part-year resident returns or state credits, so ask whether and how the firm handles them for the states involved, and whether it prepares the returns itself. The income and revenue minimums may put some households outside what the firm takes on. The CPA named decides what applies to you, not this article.

Frequently Asked Questions

Can two states tax the same RSU income after I move?

Yes, it can happen. Some states allocate equity pay across the period from grant to vest, so a state you left may claim part of a vest that happens after you move. A credit for tax paid to another state may reduce the overlap, but it is usually limited. Check each state's current rules with a CPA.

What is a part-year resident return?

A part-year resident return is a state return for a year in which you lived in that state for only part of the year. It generally reports income from your months as a resident, and it may include income sourced to the state for the rest of the year. Forms and rules differ by state, so confirm the details for each.

Does the credit for taxes paid to another state remove double tax?

Not always. In general, the credit cannot exceed the tax the credit-giving state imposes on that same income, so some double tax can remain. It also may not apply to every kind of income. Whether it helps, and by how much, depends on both states' rules and the facts, and your CPA can check it.

Should I make estimated payments to my old state after a move?

Possibly, if a vest is likely to be treated as partly earned there and no tax is withheld for it. Short withholding can lead to a penalty. Whether payments make sense depends on both states' rules and your numbers, so ask a CPA before the next vest, not after you file.

If you have RSUs and changed states this year, check one thing this week: gather your vest dates, grant dates and move date, and ask your CPA whether each state may claim a share of the income. You can browse accountants on Sam's List, including the firm above, and your CPA decides what applies to you.

---

About the author: Kimberly Green is the cofounder of Sam's List, where business owners and high earners find vetted CPAs, financial advisors, and fractional CFOs. She's met one-on-one with 400+ financial professionals and writes from the real data behind thousands of client-advisor matches. Ask her anything about finding an accountant - she's heard it all, including the questions people are afraid to ask.