RSU Vesting After-Tax Calculator
See how many shares you actually keep after RSU vesting tax, and whether the standard withholding covers your real tax bill.
RSU Vesting Tax Breakdown
Shares You Keep (after sell-to-cover)
316.75
Net Value After Tax
$25,340
Vested RSUs are taxed as ordinary income at your marginal rate, withheld here at the flat 22% supplemental-wage rate. Based on your actual salary and bracket, you truly owe about $9,600 in federal tax on this vest — more than the $8,800 withheld, so you'll owe about $800 more at tax filing time.
What Is the RSU Vesting After-Tax Calculator?
When Restricted Stock Units (RSUs) vest, the full fair market value of the shares on that date counts as ordinary W-2 income — taxed at your marginal rate and subject to FICA, exactly like a cash bonus. It doesn't matter whether you sell the shares or hold them; the moment they vest, that value is taxable income. Most employers handle the tax bill through "sell-to-cover" — automatically selling a portion of the vesting shares to pay the withholding, and depositing the remaining shares into your account. This calculator shows how many shares you actually keep, and — just as importantly — whether the standard withholding rate covers what you truly owe.
This matters a lot for RSU-heavy compensation, because the IRS lets employers withhold federal tax on this kind of income at a flat 22% rate, regardless of your real bracket. For many salaried tech and finance employees, RSU income stacks on top of a salary that's already well into the 24%, 32%, or 35% brackets — meaning the flat 22% withholding significantly undershoots the real tax bill, creating a common, unpleasant surprise at filing time.
This calculator covers the vesting event only — if you hold shares after they vest and their price changes before you sell, that's a separate capital gains event (short or long-term depending on how long you hold), not modeled here. For the related question of what it costs to exercise stock options, see the Stock Option Exercise Cost calculator planned for this category.
RSU Vesting After-Tax Calculator Formula
Vested Value = Shares × Fair Market Value at Vesting
Federal Withheld = Vested Value × 22% (37% above $1,000,000)
Actual Tax on Vest = Tax(Salary + Vested Value) − Tax(Salary Alone)
How Is the RSU Vesting After-Tax Calculator Calculated?
The actual federal tax attributable to the vest is found the same way as any stacked supplemental income — calculate total tax with the vested value included, then subtract tax on salary alone, isolating exactly what the vest itself added to your tax bill at your real marginal rate. FICA (Social Security and Medicare) applies to the full vested value exactly like regular wages, with Social Security capped once your combined salary and vested value for the year reach the annual wage base.
"Shares sold to cover tax" divides the total withheld amount (federal, FICA, and estimated state) by the per-share fair market value, approximating how many shares a typical sell-to-cover mechanism would liquidate — actual brokerage sell-to-cover may round to whole shares and sell slightly more than the exact tax amount to cover transaction costs and rounding, so real results may differ marginally from this estimate.
RSU Vesting After-Tax Calculator Example
A $130,000 salary with 500 shares vesting at $80/share ($40,000 vested value, Single, 7% state): about 183 shares get sold to cover taxes, leaving 317 shares (worth $25,340 after all withholding). Because this salary is already in the 24% bracket, the flat 22% withholding ($8,800) falls $800 short of the actual $9,600 owed.
A high earner on $300,000 salary (already in the 35% bracket) with 1,000 shares vesting at $120/share ($120,000 vested value, Single, 9% state): the flat 22% withholding ($26,400) undershoots the actual $42,000 owed by a substantial $15,600 — a gap large enough to meaningfully affect a filing- time tax bill if not planned for.
How to Use the RSU Vesting After-Tax Calculator
Step 1
Enter your annual base salary.
Step 2
Enter the number of RSU shares vesting and the fair market value per share on the vest date.
Step 3
Select your filing status and enter an estimated state tax rate.
Step 4
Review how many shares you keep after sell-to-cover and whether withholding covers your real tax.
Benefits
- Shows the real number of shares you keep after typical sell-to-cover withholding, not just a dollar estimate.
- Reveals the common under-withholding gap for RSU income stacked on top of a higher-bracket salary.
- Applies the correct 2026 federal brackets and FICA mechanics, including the Social Security wage-base interaction.
- Helps you plan ahead for a potential tax bill rather than being surprised at filing time.
- Free, instant, and runs entirely in your browser.
Common RSU Vesting After-Tax Calculator Scenarios
Scenario 1
Estimating how many shares you'll actually receive after a vesting event.
Scenario 2
Checking whether you should set aside extra cash for taxes beyond standard sell-to-cover withholding.
Scenario 3
Planning around multiple vesting events in the same tax year.
Scenario 4
Comparing take-home value of RSU-heavy compensation against a higher base salary offer.
Scenario 5
Understanding why a high earner's RSU withholding often falls short of their real tax bracket.
Understanding Your Result
"Shares You Keep" reflects a typical sell-to-cover outcome — your brokerage or employer plan administrator sells enough shares to cover the withholding, and you retain the rest. "Actual Federal Tax Owed on Vest" is your real tax liability on this income once your full-year earnings are considered, which determines whether the standard withholding leaves you owing more or getting some back at filing time.
A meaningful under-withholding gap is common for RSU income specifically, since the flat 22% rate was designed as a simple standard rate, not a personalized one — if you're in a bracket above 22% (which includes most salaries above roughly $50,000 Single), expect this gap on every vest unless you proactively set aside extra or adjust your withholding elsewhere.
Tips
- If you're in a tax bracket above 22%, consider setting aside the estimated shortfall from each vest in a separate account rather than assuming sell-to-cover fully handled it.
- Multiple vesting events in the same year compound this effect — each one stacks on top of your salary and any prior vests, potentially pushing later vests into even higher brackets.
- Selling vested shares immediately avoids additional capital gains risk, since the shares' value going forward is a separate bet on the stock beyond your compensation.
- If you hold shares after vesting and later sell at a gain, that additional gain is taxed separately under capital gains rules based on your holding period from the vest date.
- You can adjust your W-4 to withhold more from your regular paychecks to offset an expected RSU under-withholding gap, spreading the impact across the year instead of a lump sum at filing.
Common Mistakes
- Assuming the shares remaining after sell-to-cover fully account for your real tax bill, when the flat 22% withholding often falls short for higher earners.
- Confusing RSU vesting tax (ordinary income, based on value at vesting) with capital gains tax on shares held and sold later (a separate, subsequent event).
- Not planning for multiple vesting events in a year compounding into a larger-than-expected tax bill.
- Forgetting that FICA tax applies to the full vested value on top of federal and state income tax.
- Selling shares immediately after vesting and being surprised by a small additional capital gain or loss from price movement between the vest date and the trade settling.
Frequently Asked Questions
Is RSU vesting taxed differently from a cash bonus?
No — vested RSU value is taxed as ordinary income exactly like a cash bonus, using the same supplemental wage withholding rules (commonly a flat 22% federal rate) and full FICA tax.
What is "sell-to-cover"?
It's the most common way employers handle RSU tax withholding — automatically selling enough of the vesting shares to cover the required tax withholding, and depositing the remaining shares (or their cash value) to you.
Do I owe tax again when I sell the remaining shares?
Only on any additional gain (or loss) between the vest-date value and your eventual sale price — that's a separate capital gains event, taxed at short-term or long-term rates depending on how long you've held the shares since vesting, not modeled in this calculator.
Why does my RSU withholding seem too low compared to my tax bracket?
The standard 22% supplemental withholding rate is a flat IRS-sanctioned shortcut, not personalized to your actual bracket — if your marginal rate is above 22% (common for salaries above roughly $50,000 Single), the withholding will fall short of your real liability.
Does this calculator account for multiple vesting events in the same year?
Not directly — enter your salary plus any RSU value already vested earlier in the year as part of the salary figure to approximate a later vest's marginal impact, since later vests stack on top of everything that came before in the same tax year.
What if my company withholds using the aggregate method instead of the flat rate?
Some employers add vested RSU value to your regular paycheck and withhold as if that combined amount were your normal pay for the period, which usually withholds more than the flat 22% method — this calculator models the more common flat-rate approach.
Does Social Security tax apply to RSU vesting?
Yes, at 6.2%, up to the annual Social Security wage base ($184,500 for 2026) — if your salary alone already reaches that cap before the vest, no additional Social Security tax applies to the vested value.
What happens if my vested value is very large, over $1,000,000?
The portion of your total supplemental wages (RSUs, bonuses, and similar) above $1,000,000 in a calendar year is withheld at 37% federal instead of the standard 22% rate.
Should I hold or immediately sell RSU shares after they vest?
That's an investment decision separate from the tax mechanics this calculator addresses — many financial advisors suggest selling immediately to avoid concentrating additional risk in a single company's stock beyond what your compensation already represents, but that depends on your broader financial situation and views.
Does this calculator work for RSUs at a private company?
The same ordinary-income tax treatment generally applies at vesting for private company RSUs, though liquidity to actually sell shares to cover taxes may be limited before an IPO or acquisition — check your specific plan's terms, since some private company RSUs use "double-trigger" vesting that delays taxation until a liquidity event.
Is this the same as how stock options are taxed?
No — stock options have different tax mechanics depending on the option type (incentive vs non-qualified) and involve an exercise decision RSUs don't. See the Stock Option Exercise Cost calculator planned for this category for that separate case.
Can I share my RSU vesting result as an image?
Yes — tap Share and, on supported devices, your result is shared as a branded image card, not just a text link.
References
Important Information
This calculator provides estimates for informational purposes only and is not tax, legal, or financial advice. Uses 2026 IRS federal tax brackets and the standard 22%/37% supplemental wage withholding rates; actual employer withholding may use the aggregate method, and sell-to-cover share counts may round differently than this estimate. Confirm your specific situation with a qualified tax professional.
Last updated: August 2026