California RSU Tax Rate: How Your Vested Shares Are Taxed

Your shares vested in March. Your employer sold a portion to cover the tax. Then April arrived and the number on your return was a balance due, not a refund. The first question most people ask is not why it happened. It is simpler: what rate is California actually charging me on my RSUs?

There is no single RSU rate. What you owe depends on when the shares vested, how much other income you had that year, and where you lived and worked. But the framework is fixed, and once you understand it, you can see why the withholding often comes up short and start closing that gap.

At vest, your RSUs are wages, not investment income

When a restricted stock unit vests, the fair market value of the shares on that day is reported as compensation on your W-2. That is the entire story for tax purposes: the vest is wages, taxed as ordinary income in the year it happens. It is not a capital gain, and it is not deferred until you sell.

That distinction drives every number that follows. Because the vest is wages, federal income tax, Social Security and Medicare, and California income tax all apply. Because it is not investment income, the preferential long-term capital gains rates do not touch the shares themselves. Those rates only matter later, on any growth between vest and sale.

The California side: ordinary income, top rate 12.3 percent

California taxes RSU vest income exactly the way it taxes your salary, because for California that is what it is. There is no special rate for equity compensation and no preferential rate to lower the bill. California's top income tax bracket is 12.3 percent. On taxable income above $1 million, a 1 percent surcharge applies, for a combined top rate of 13.3 percent. California also taxes long-term capital gains as ordinary income, which matters if you hold the shares and they rise before you sell.

The practical effect is that a large vesting year lands in California's highest brackets on the portion of income that reaches them. Most employees never see those rates in their paystub, which is precisely why the April balance due shows up.

The federal side: 22 percent withholding is not your rate

When an employer withholds on RSUs, bonuses, or severance, the default is a flat 22 percent, plus a mandatory 37 percent on supplemental wages above $1 million in the year. Your actual federal marginal rate can be higher or lower depending on total income, and for a senior tech executive it is often higher. The federal brackets still top out at 37 percent, and a large vest can push a meaningful slice of income into the higher brackets.

That gap, between the flat 22 percent withheld and your real marginal rate, is the single most common reason people owe in April. It is also why a bigger filing-year income can quietly reshape your whole tax picture, from brackets to phaseouts.

The taxes that apply, and the one that does not

On the vest itself, here is what applies: federal income tax, California income tax, Social Security up to the $184,500 wage base, Medicare, and the 0.9 percent Additional Medicare Tax on wages above $200,000 for single filers and $250,000 for married filing jointly.

Here is the one many people get wrong: the 3.8 percent net investment income tax does not apply to the vest. That tax applies to investment income, meaning gains on shares sold after vesting, dividends, and interest, not the wage income the vest itself produces. If you sell the shares later at a gain, the growth is investment income and the 3.8 percent can then apply on top of the capital gains tax.

When you sell, the tax changes character

Once the shares vest, they become ordinary stock in your account and you move into the world of capital gains. Hold them more than a year and sell at a gain, and the growth is long-term capital gain, taxed federally at rates that top out at 20 percent, plus the 3.8 percent net investment income tax when it applies. In California, the gain is still ordinary income, taxed at the state's regular rates.

None of that changes the vest itself. The wage income was recognized the day the shares vested. If a large position in one employer's stock has quietly become most of your net worth, unwinding it is a separate decision with its own tax consequences, and diversifying without a tax catastrophe is a plan, not a single sell order.

If you leave California, where the work was done matters

California sources RSU income based on where you worked between the grant date and the vest date. Move to Texas or Florida midstream and a portion of a later vest can still be California income, even after you have left. The split turns on your workdays in and out of California over the vesting period, not on where you live on the vest date.

It is one of the most expensive misconceptions in the leaving-California playbook, and it carries its own deadlines. If a move is part of your plan, the timing of grants, vests, and the move itself should be coordinated before the year closes. The same is true of a layoff or job change, which can surface deadlines on options and vesting that most people are never told about.

Bring the numbers to a strategist

If your RSUs are pushing you into California's top brackets and the withholding is not keeping up, the fix is not a bigger refund. It is a plan, and RSU tax planning for California is where the real moves get made. The first step is a free 15-minute discovery call, where we look at what you hold, what vested, and what is coming, and talk through whether a full strategy engagement is a fit. We are tax strategists and an enrolled agent firm, not preparers and not asset managers.

Call (619) 280-2700 or email info@RoadmapTax.com to book. We do not promise an answer on that first call. The goal is to sort out which questions matter for your own numbers.

FAQ

What is the California RSU tax rate?

There is no single RSU rate. RSU vest income is taxed as ordinary income in California, with a top bracket of 12.3 percent and a 1 percent surcharge on taxable income above $1 million, for a combined top rate of 13.3 percent. What you actually pay depends on your total income for the year.

Are RSUs taxed as ordinary income or capital gains?

At vest, RSUs are taxed as ordinary wage income, not capital gains. The shares only produce capital gains later, on any growth between the vest date and when you sell them.

Why did my RSU withholding not cover my tax bill?

Employers typically withhold a flat 22 percent on RSU vests, while your actual federal marginal rate may be 32, 35, or 37 percent, with California added on top. The difference between the flat withholding and your real rate is what shows up as a balance due in April.

Does California tax RSUs differently than the federal government?

Yes, in one important way. California taxes all RSU income as ordinary income and also taxes capital gains as ordinary income, with no preferential capital gains rate. The federal government applies separate, lower rates to long-term capital gains.

Do I pay the 3.8 percent net investment income tax on my RSUs?

Not on the vest itself. The 3.8 percent net investment income tax applies to investment income, such as gains on shares sold after vesting, dividends, and interest, not to the wage income from an RSU vest.

What happens to my RSU taxes if I move out of California?

California can still tax a portion of a later vest if you worked in California between the grant and vest dates, based on your workdays during that period. The allocation is decided by where the work was performed, not where you live on the vest date.

This article is for educational purposes only and does not constitute tax, legal, or investment advice.