Moved From Washington to Utah With RSUs: The Vest That Was Free Until You Got Here.

An engineer at a Seattle company takes a role in Lehi, keeps the same unvested grant, and closes on a house on the first of July. Nobody mentions the vesting schedule during the relocation conversation, because at the old address it never mattered. Washington has no personal income tax, so every tranche that vested there was a payroll event and nothing else. Moved from Washington to Utah, RSU taxes appear for the first time, and they attach to the whole tranche rather than to the part you earned after arriving.

Someone leaving California carries a California tail on unvested equity, since California claims the share of each tranche attributable to California workdays between grant and vest. That claim is a cost, but it comes with a credit: Utah gives back its own rate on the doubly-taxed slice. Leaving Washington produces the opposite shape. No state is claiming the pre-move workdays, so nothing offsets and nothing credits. The tranche simply moves from a 0% jurisdiction to a 4.45% one on the day you establish Utah residency.

Practically, the vest date is the whole game. A tranche vesting on June 15 while you still live in Bellevue costs nothing at the state level. The same tranche vesting on July 15 after you close in Lehi costs 4.45% of its full value. Relocation timing is often negotiable by a few weeks, and vest dates occasionally are too. That is a rare case where a calendar conversation before the move is worth more than any work done on the return afterward.

Most grants vest quarterly or monthly, so a mid-year move splits the schedule rather than moving all of it. On a standard quarterly schedule with February, May, August, and November vest dates, a July move leaves two tranches on the Washington side and two on the Utah side, and only the second pair is taxable. Run the schedule before you set a closing date. On a large grant, the difference between arriving in late July and arriving in early August can be one tranche, and one tranche is often five figures of Utah tax.

The same logic reaches other equity, with different mechanics. Nonqualified stock options are taxed at exercise rather than at vest, so the controllable date is the day you exercise, and holding unexercised options through the move hands Utah the entire spread. Incentive stock options generate no regular tax at exercise but do create an alternative minimum tax adjustment, and Utah is not one of the six states with an individual AMT, so that particular exposure stays federal wherever you live. A qualified §423 employee stock purchase plan is different again: nothing is taxed at purchase, and the ordinary income piece is recognized at sale, which for most people falls well after the move and lands squarely in Utah.

Vested shares you are holding follow a different rule and it runs the other way. Washington's capital gains excise tax under RCW 82.87 charges 7% on long-term gains above an inflation-indexed standard deduction, with an additional 2.9% tier on gains above $1,000,000 added for sales from January 1, 2025 forward. For intangible property such as stock, RCW 82.87.100(1)(b) allocates the gain to Washington only if you were domiciled there when the sale occurred. Change your domicile to Utah and sell, and Washington has no claim.

That does not automatically make selling from Utah cheaper, because the two systems are shaped differently. Washington charges a higher rate but exempts a large first slice: the standard deduction was $278,000 for 2025, indexed annually. Utah charges 4.45% from the first dollar with no equivalent exemption, since it taxes capital gains as ordinary income. On a moderate gain, Washington is the cheaper place to sell. On a large one, Utah is.

The crossover sits at roughly $763,000 of long-term gain. Below it, Washington's $278,000 exemption beats Utah's lower rate and selling before you change domicile wins. Above it, Utah's 4.45% on everything beats Washington's 7% on the excess, and waiting until you are a Utah resident wins. Above $1,000,000 the gap widens further, because Washington's second tier applies and Utah's rate does not move. Knowing which side of $763,000 a position sits on is a five-minute calculation that occasionally reorders an entire year.

Washington has no individual income tax return, so there is no Washington part-year filing to worry about. If you triggered the capital gains excise tax while still domiciled there, that is its own return with its own deadline, filed with the Department of Revenue rather than as part of an income tax return. Everything else lands on the Utah side: Form TC-40 with Schedule TC-40B, where Column A picks up all income received while you were a Utah resident. The mechanics of that schedule are covered in moved to Utah part-year resident taxes.

Watch the withholding on the first post-move vest. Brokers withhold at supplemental federal rates and at whatever state the payroll record shows, and a stale Washington work state means zero Utah withholding on a fully taxable tranche. That produces a clean-looking confirmation and an underpayment penalty. The residency-planning angles on the Washington side, including what SB 5813 changed, are in Washington capital gains tax on RSU sales.