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RSU Tax Calculator — What You Actually Owe on Vesting Shares

Estimate federal, state, FICA, and Medicare taxes on your vesting RSUs — and the withholding shortfall most tech employees miss.

Quick answer: RSUs are generally taxed as ordinary income when they vest, then gains or losses after vesting are capital gains or losses. Withholding may be too low for high earners.

Total Vest Value
$75,000
Total Vest Value
$75,000
Combined W-2 Wages
$255,000
Modeled Federal Supplemental Withholding
$16,500
Entered-Rate Federal Tax Reserve
$24,000
Modeled vest allocation
$73,418total
Estimated cash$49,664
Federal withholding$16,500
State tax$6,975
Employee payroll tax$279
Total$73,418
Entered-Rate State Tax
$6,975
Employee Social Security Tax
$279
Employee Medicare Tax
$1,583
Estimated Vest Cash After Modeled Withholding
$49,664
Diagnostic

The modeled federal supplemental withholding is $16,500; your entered-rate reserve is $24,000.

A positive $7,500 reserve difference means the entered-rate reserve is higher than modeled withholding. It is not a predicted balance due.

Find a high-yield savings account for a tax reserve
What to do next

Park Your Tax Reserve in a High-Yield Account

Your action plan
  1. 1

    Calculate the baseline result with your current numbers

    Estimate supplemental withholding, employee payroll tax, state tax, and an entered-rate federal reserve for an RSU vest.

  2. 2

    Pressure-test one alternate scenario before deciding

    Assumptions change the answer, especially when rates, taxes, or timing matter.

  3. 3

    Save the result to Money Map or use the linked next action

    Turn the result into a prioritized action instead of treating it as a one-off number.

Park Your Tax Reserve in a High-Yield Account

This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

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Frequently Asked Questions

Everything you need to know.

Why does my employer only withhold 22% on RSUs?
IRS rules treat RSU vesting as supplemental wages with a flat 22% federal withholding rate (37% above $1M). Most companies use this default. It is your responsibility to estimate your actual liability and either (a) increase your W-4 withholding, (b) make quarterly estimated payments, or (c) save the shortfall yourself and pay at tax time.
Should I sell my RSUs immediately when they vest?
Mathematically, yes — vesting and selling are taxed identically (ordinary income on the full value). Holding turns it into a concentrated single-stock bet on your employer, which most financial advisors discourage. The only reason to hold is if you believe the stock will outperform a diversified index after tax.
What is the additional 0.9% Medicare tax?
Earnings above $200K (single) or $250K (married filing jointly) incur an additional 0.9% Medicare tax — on top of the standard 1.45%. This calculator includes it when your total income crosses that threshold.
Is the RSU Tax Calculator — What You Actually Owe on Vesting Shares free to use?
Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.
Does using the RSU Tax Calculator — What You Actually Owe on Vesting Shares affect my credit score?
No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.
Are the results personalized financial advice?
No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.
What should I do after seeing the result?
Use the recommendation module on this page to park your tax reserve in a high-yield account, or run Money Map to compare this investing & retirement decision with your other opportunities.
How does SwitchWize choose related offers?
Related offers are matched by the calculator surface (savings) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.
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The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.
Can Money Map use this result?
Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

Why This Matters

Most employers withhold federal tax on RSUs at a flat 22% (or 37% above $1M). But if you are in the 32% or 35% bracket — typical for senior tech roles — that means you owe a 10-13 percentage point shortfall at tax time. On a $200K RSU vest, that is a $20-26K surprise bill. This calculator quantifies exactly how much to set aside in a HYSA so you are not scrambling in April.

How to Use It

  1. 1Enter the value of your vesting RSUs (shares × FMV on vest date)
  2. 2Enter your other annual W2 income (base + bonus) to determine your marginal bracket
  3. 3Pick filing status
  4. 4Set your state income tax rate
  5. 5See the actual federal liability vs employer withholding, plus state and FICA
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Park Your Tax Reserve in a High-Yield Account