Restricted Stock Units Tax Guide: From Vesting Through Disposition
RSUs have become the dominant equity compensation vehicle at large public technology companies, financial institutions, and corporations of every type — and they are also among the most frequently misunderstood instruments in personal tax planning. Every year, we work with executives and employees who discover they dramatically overpaid taxes on their RSU income because they did not understand the basic mechanics of how RSUs are taxed, or who missed the opportunity to convert post-vesting appreciation into long-term capital gains by selling too quickly. Understanding the RSU tax treatment from vesting through disposition is the foundation of effective equity compensation planning.
How RSUs Are Taxed: The Fundamental Mechanics
RSUs are taxed as ordinary income at the moment of vesting. The taxable amount equals the fair market value of the shares on the vesting date — regardless of whether the employee has sold any shares, regardless of what price the shares were granted at, and regardless of whether the shares subsequently decline in value. Because RSU income is treated as compensation, it is subject to federal income tax, FICA taxes (social security and Medicare), and applicable state and local income taxes, all withheld by the employer at the time of vesting.
The employer's withholding rate on RSU income is typically 22% for federal taxes (the supplemental wage rate for income under $1 million), which is below the 37% top marginal rate applicable to executives earning above the top bracket threshold. This creates an immediate tax liability gap: if a senior executive's RSUs vest and generate $500,000 in income, the employer withholds 22% ($110,000), but the actual federal tax due at the marginal rate may be $185,000 — a $75,000 underpayment that becomes due with the annual return, accompanied by potential underpayment penalties if quarterly estimated taxes were not paid. Our tax planning specialists build quarterly estimated tax schedules for every executive with significant RSU vesting activity to prevent this outcome.
Post-Vesting Strategy: Holding vs. Selling and the Long-Term Capital Gains Opportunity
After RSUs vest and the ordinary income tax is paid on the vesting-date value, the shares become an asset held by the employee with a tax basis equal to the vesting-date price. Any subsequent appreciation in value is taxed separately as capital gain — short-term if the shares are sold within twelve months of vesting, and long-term if held for more than twelve months.
For a New York executive whose RSUs vest in January and who then holds the shares for thirteen months before selling in February of the following year, the post-vesting appreciation is taxed at the preferential long-term capital gains rate — 20% federal — rather than as ordinary income at 37%. In New York's combined tax environment, where short-term gains are taxed at rates approaching 50% and long-term gains at rates approaching 34%, this thirteen-month hold can produce a 16-point rate differential on every dollar of post-vesting appreciation. Whether this rate differential justifies the concentration and market risk of holding employer stock is the central planning judgment that we help every executive make with their specific RSU vesting profile in mind.
RSU Income and the Net Investment Income Tax
RSU income itself — the ordinary income recognized at vesting — is not subject to the 3.8% Net Investment Income Tax (NIIT) because it is treated as wages. However, the post-vesting capital gain on shares that have been held beyond vesting and subsequently appreciated is subject to the NIIT for taxpayers with modified adjusted gross income exceeding $200,000 (single) or $250,000 (married filing jointly) — thresholds that virtually every executive with meaningful RSU income breaches routinely. The NIIT adds 3.8 percentage points to the effective federal capital gains rate, pushing the federal long-term capital gains rate from 20% to 23.8% at the high-income level.
When combined with the employer stock concentration risk dynamic, the post-vesting planning decision for high-income executives becomes a multi-dimensional optimization across tax rates, market risk, diversity objectives, and estimated tax cash flow. We model all four dimensions simultaneously for our HNWI clients with significant executive compensation to ensure the holding decision is made on a complete analytical basis rather than a reflexive sell-immediately approach.
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