Rsu Tax Calculator
Estimate taxes owed when restricted stock units vest based on share price and income bracket. Enter values for instant results with step-by-step formulas.
Reviewed for accuracy by Sahil, Senior Finance & Tax Editor
Rsu Tax Calculator
Calculator
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Formula: Vest Tax = Shares x Vest Price x (Federal Rate + State Rate + SS Rate + Medicare Rate)
Worked example — Vest Tax: $18,325 | Shares Received: 390 | Capital Gain: $7,800 | Effective Rate: 36.7%
Formula
Vest Tax = Shares x Vest Price x (Federal Rate + State Rate + SS Rate + Medicare Rate)
At vesting, the full fair market value of RSU shares is taxed as ordinary income. Federal income tax, state income tax, Social Security (6.2%), and Medicare (1.45%) all apply. Capital gains tax applies separately on any appreciation after the vesting date.
Worked Examples
Example 1: Tech Employee RSU Vesting Event
Problem:500 RSUs vest at $100/share. Employee is in the 24% federal bracket with 5% state tax. Sell-to-cover at 22% withholding. Shares later sold at $120.
Solution:Vest value: 500 x $100 = $50,000 Federal tax (24%): $50,000 x 0.24 = $12,000 Social Security (6.2%): $50,000 x 0.062 = $3,100 Medicare (1.45%): $50,000 x 0.0145 = $725 State tax (5%): $50,000 x 0.05 = $2,500 Total vest tax: $18,325 Shares withheld (22%): ceil($11,000 / $100) = 110 shares Shares received: 390 Capital gain on sale: 390 x ($120 - $100) = $7,800 LTCG tax (15%): $7,800 x 0.15 = $1,170
Result:Vest Tax: $18,325 | Shares Received: 390 | Capital Gain: $7,800 | Effective Rate: 36.7%
Example 2: Large RSU Vest in High-Tax State
Problem:1,000 RSUs vest at $200/share. Employee is in the 35% federal bracket with 10% state tax. Sell-to-cover at 22%.
Solution:Vest value: 1,000 x $200 = $200,000 Federal tax (35%): $200,000 x 0.35 = $70,000 Social Security (6.2%): $200,000 x 0.062 = $12,400 Medicare (1.45%): $200,000 x 0.0145 = $2,900 State tax (10%): $200,000 x 0.10 = $20,000 Total vest tax: $105,300 (52.65% effective) Shares withheld at 22%: ceil($44,000 / $200) = 220 Shares received: 780 Additional tax owed: $105,300 - $44,000 = $61,300
Result:Vest Tax: $105,300 | Shares Received: 780 | Additional Tax Owed: $61,300 | Effective Rate: 52.7%
Frequently Asked Questions
How are RSUs taxed when they vest?
When restricted stock units vest, the full fair market value of the shares on the vesting date is treated as ordinary income and is subject to federal income tax, state income tax, Social Security tax, and Medicare tax. Unlike stock options, there is no exercise price or cost basis decision involved because you receive the shares for free as part of your compensation. For example, if 500 RSUs vest when the stock price is $100 per share, you have $50,000 of ordinary income added to your W-2 for that year. Your employer is required to withhold taxes on this income, typically by selling a portion of the vesting shares (sell-to-cover) or by withholding from your paycheck. The fair market value at vesting becomes your cost basis for calculating any future capital gains or losses when you sell the shares.
What is sell-to-cover and how does it work with RSUs?
Sell-to-cover is the most common method companies use to handle tax withholding when RSUs vest. Under this approach, your employer automatically sells enough of your vesting shares to cover the required tax withholding, and you receive the remaining shares in your brokerage account. For example, if 100 RSUs vest at $100 per share and the withholding rate is 22%, the company would sell approximately 22 shares to generate $2,200 for tax withholding, and you would receive the remaining 78 shares. The default federal supplemental withholding rate of 22% is often insufficient for employees in higher tax brackets, which can lead to an unexpected tax bill at filing time. Some companies allow you to elect a higher withholding rate or choose alternative methods like net settlement or paying the tax in cash from your paycheck.
What is the difference between RSUs and stock options?
RSUs and stock options are both forms of equity compensation but differ fundamentally in structure and tax treatment. RSUs represent a promise to deliver actual shares of stock at a future vesting date at no cost to the employee, meaning they always have value as long as the stock price is above zero. Stock options give you the right to purchase shares at a predetermined strike price, meaning they only have value if the stock price exceeds the strike price. For tax purposes, RSU income is recognized automatically at vesting based on the full share value, while stock option income is only recognized when you choose to exercise. RSUs are simpler because there are no exercise decisions or timing strategies required. However, stock options provide more control over when you recognize income and can be more valuable if the stock appreciates dramatically, since your effective cost basis is the strike price rather than zero.
Why is my RSU tax withholding often not enough?
The default federal withholding rate on RSU vesting is 22%, which applies to supplemental wages. However, many tech workers and professionals who receive significant RSU compensation are in the 32%, 35%, or even 37% federal tax bracket, meaning they are substantially underwithheld. When you add state taxes of 5% to 13%, Social Security at 6.2%, and Medicare at 1.45%, the actual total tax rate on RSU income can range from 35% to over 50%. For example, a California resident in the 35% federal bracket faces a combined rate of approximately 50% (35% federal + 13.3% state + 1.45% Medicare), but only 22% was withheld at vesting. This means they could owe an additional 28% when filing their tax return. Many financial advisors recommend either electing higher withholding or setting aside additional funds to cover the expected shortfall.
What happens to RSUs if I leave the company before they vest?
Unvested RSUs are almost always forfeited when you leave a company, whether you resign, are laid off, or are terminated for cause. This is because RSUs are designed as a retention tool, and the vesting schedule is structured to incentivize employees to stay with the company. Most RSU grants follow a four-year vesting schedule with a one-year cliff, meaning no shares vest during the first year, and then shares vest quarterly or monthly over the remaining three years. If you leave before the cliff, you receive nothing. If you leave after the cliff but before full vesting, you keep the shares that have already vested but forfeit all unvested shares. In some cases, such as acquisition or change of control events, RSU vesting may be accelerated under the terms of the grant agreement or a negotiated severance package.
How do I calculate capital gains on RSU shares I sell?
When you sell RSU shares, your capital gain or loss is calculated as the difference between the sale price and your cost basis, which is the fair market value of the shares on the vesting date. For example, if your RSUs vested at $100 per share and you sell at $120 per share, your capital gain is $20 per share. The holding period for determining short-term versus long-term capital gains treatment begins on the vesting date, not the grant date. If you sell within one year of vesting, the gain is taxed as a short-term capital gain at your ordinary income tax rate. If you hold for more than one year after vesting, the gain qualifies for the preferential long-term capital gains rate of 0%, 15%, or 20% depending on your income level. If the stock price has declined since vesting, you may have a capital loss that can offset other gains.
Should I sell my RSU shares immediately or hold them?
This decision depends on your financial situation, tax bracket, risk tolerance, and views on the company's stock prospects. Selling immediately eliminates the risk of the stock price declining and converts your compensation into cash that can be diversified into other investments. From a tax perspective, selling immediately means any gain or loss is minimal since the sale price is close to the vesting price, simplifying your tax situation. Holding the shares means you are making an active investment decision to increase your concentration in your employer's stock, which carries both company-specific risk and market risk. Many financial advisors recommend selling RSUs promptly to maintain portfolio diversification, especially since your human capital (salary and future RSUs) is already tied to the company's success. If you hold and the stock appreciates, you benefit from long-term capital gains rates after one year.
How does the additional Medicare surtax affect RSU income?
The Additional Medicare Tax of 0.9% applies to combined wages, compensation, and self-employment income exceeding $200,000 for single filers or $250,000 for married filing jointly. Since RSU vesting income is treated as wages and added to your W-2, it contributes to your total compensation for purposes of this threshold. For example, if your base salary is $180,000 and $100,000 worth of RSUs vest in the same year, your total compensation is $280,000, putting $80,000 over the single filer threshold and triggering an additional $720 in Medicare surtax (0.9% of $80,000). Your employer is required to begin withholding the additional Medicare tax once your wages exceed $200,000 in a calendar year, regardless of your filing status. If your spouse also earns income, you may owe additional surtax at filing that was not withheld during the year.
Can I defer RSU income to reduce my current tax burden?
Standard RSUs cannot be deferred because the income is automatically recognized on the vesting date per IRS Section 409A regulations. However, some large companies offer deferred stock units (DSUs) or allow employees to make an irrevocable election to defer RSU delivery to a future date before the vesting period begins. This election must typically be made at least 12 months before the vesting date under Section 409A rules. Deferred RSUs delay the income recognition and tax liability until the shares are actually delivered, which could be at a specified future date, upon separation from service, or at retirement. Another indirect strategy is to maximize pre-tax retirement contributions in years when RSUs vest, using 401(k) contributions to offset some of the additional taxable income. However, 401(k) contributions reduce your salary withholding basis, not the RSU income directly.
How do RSU taxes work for employees in states with no income tax?
Employees in states with no income tax, such as Texas, Florida, Washington, Nevada, Wyoming, South Dakota, Alaska, Tennessee, and New Hampshire, enjoy a significant tax advantage on RSU income because they avoid the state tax component entirely. In a high-tax state like California with a top rate of 13.3%, an employee vesting $100,000 in RSUs would owe approximately $13,300 in state tax alone. In Texas, that same employee saves the entire $13,300. However, there are important nuances for employees who move between states or work in multiple states. If you earned RSUs while working in California but moved to Texas before vesting, California may still claim a portion of the RSU income based on the ratio of time the RSUs were earned in California. This allocation methodology varies by state, and some states are particularly aggressive about taxing deferred compensation earned within their borders.
References
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Reviewed for accuracy by Sahil, Senior Finance & Tax Editor · Editorial policy
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