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RSU Tax Calculator – Estimate Your Equity Tax Bill

Free RSU tax calculator to estimate taxes on restricted stock units. Enter grant details for instant federal and state tax results.

⚡ Free to use 📱 Mobile friendly 🕒 Updated: June 21, 2026
🧮 RSU Tax Calculator
📊 Estimated Tax Liability vs. Net Shares at Different RSU Vest Amounts
📋 Table of Contents
  1. Use the Rsu Tax Calculator
  2. What is Rsu Tax Calculator?
  3. How to Use
  4. Formula Used
  5. Example Calculation
  6. Benefits
  7. Tips and Tricks
  8. Conclusion
  9. FAQ (8 Questions)

What is Rsu Tax Calculator?

A Restricted Stock Unit (RSU) Tax Calculator is a specialized financial tool designed to estimate the tax liability incurred when your vested RSUs are converted into actual shares or cash. Unlike simple stock calculators, this tool accounts for the unique tax treatment of RSUs, which are taxed as ordinary income upon vesting—not at the time of grant or sale. For employees at publicly traded companies like Google, Microsoft, or Amazon, accurately projecting this tax burden is critical to avoid a surprise tax bill during filing season.

Stock plan administrators, HR professionals, and individual employees use this calculator to plan withholding strategies, estimate net shares received after sell-to-cover, and understand the difference between federal, state, and FICA taxes. Without this tool, many employees inadvertently under-withhold, leading to penalties and interest from the IRS. The calculator empowers users to make informed decisions about selling shares immediately or holding for long-term capital gains treatment.

Our free online RSU Tax Calculator eliminates the guesswork by integrating current tax brackets, Social Security wage caps, and Medicare surtax thresholds into a single, intuitive interface. Simply input your grant details, and the tool delivers a precise breakdown of taxes owed, net proceeds, and effective tax rate—all without requiring a login or subscription.

How to Use This Rsu Tax Calculator

Using our RSU Tax Calculator requires no advanced financial knowledge. Follow these five straightforward steps to generate a detailed tax estimate for any vesting event. The interface is designed to mirror the actual RSU lifecycle: grant, vest, sell.

  1. Enter Your Vesting Date and Share Count: Begin by inputting the exact date your RSUs will vest (or vested). This date determines the fair market value (FMV) per share used for income calculation. Then, enter the total number of RSUs vesting in this batch. For example, if you have 500 shares vesting on June 15, 2026, enter that date and number.
  2. Input the Fair Market Value (FMV) at Vesting: This is the stock’s closing price on the vesting date. You can find this on any financial site like Yahoo Finance or your brokerage statement. The calculator multiplies this FMV by your share count to determine your total ordinary income from the vesting event. For instance, if the FMV is $150, your ordinary income for 500 shares is $75,000.
  3. Provide Your Annual Salary and Filing Status: RSU income stacks on top of your W-2 salary, pushing you into higher tax brackets. Enter your base annual salary (before RSU income) and select your tax filing status (Single, Married Filing Jointly, Head of Household). The tool uses this to calculate your marginal tax rate, not your effective rate, for the RSU income.
  4. Specify State of Residence and Withholding Preferences: Select your state from the dropdown to include state income tax (if applicable) and any local taxes. Then, choose your withholding strategy: “Sell-to-Cover” (broker sells enough shares to cover taxes) or “Cash Payment” (you pay taxes out of pocket). For sell-to-cover, the calculator estimates how many shares the broker will sell.
  5. Click Calculate and Review the Detailed Breakdown: Press the “Calculate RSU Tax” button. The results page will display: total ordinary income from RSUs, federal income tax (broken down by bracket), Social Security tax (up to the annual wage cap), Medicare tax (including the 0.9% Additional Medicare Tax if applicable), state income tax, net shares deposited to your account, and total tax as a percentage of the RSU value.

For best accuracy, always use the most recent tax year’s brackets and standard deduction amounts. Our calculator auto-updates annually, but double-check your specific state’s tax rates if you live in a jurisdiction with unique rules like Oregon or California.

Formula and Calculation Method

The RSU tax calculation follows a multi-step formula that mirrors IRS guidelines. The core principle is that the entire value of vested shares (FMV × shares) is treated as supplemental wages. The calculator then applies federal, FICA, and state taxes sequentially, accounting for annual caps and surtaxes. This method ensures compliance with IRS Publication 15 (Circular E) and state-specific withholding rules.

Formula
RSU Tax Liability = (FMV per Share × Number of Vested Shares) × (Federal Marginal Tax Rate + State Marginal Tax Rate + FICA Rate) – Applicable Credits + Additional Medicare Surtax

Each variable in the formula represents a distinct component of the tax code. The FMV per share is the stock’s closing price on the vesting date, as reported by your employer. The federal marginal tax rate is determined by your total taxable income (salary + RSU income) and filing status, using the progressive brackets for the relevant tax year. The state marginal tax rate varies by jurisdiction, ranging from 0% in states like Texas and Florida to 13.3% in California. FICA taxes include Social Security (6.2% up to the annual wage base, $168,600 for 2025) and Medicare (1.45% with no cap). The Additional Medicare Surtax of 0.9% applies to wages exceeding $200,000 for single filers or $250,000 for married couples filing jointly.

Understanding the Variables

FMV per Share: This is the market value of one share of your company’s stock on the precise date the RSUs vest. It is not the grant price (which is often $0 for RSUs) nor the sale price. Using the wrong FMV is the most common error, as it directly scales the entire tax calculation. For example, if you vest 100 shares at an FMV of $200, your ordinary income is $20,000. If the FMV is actually $210, the income jumps to $21,000—a 5% difference that can push you into a higher bracket.

Federal Marginal Tax Rate: This is the rate applied to the last dollar of your total income. For 2025, the brackets are 10%, 12%, 22%, 24%, 32%, 35%, and 37%. The calculator determines which bracket your RSU income falls into by adding it to your salary. For instance, if your salary is $150,000 (single) and RSU income is $50,000, your total is $200,000. The RSU income is taxed at the marginal rate for the $200,000 level—likely 32% for the portion above $191,950. The tool does not use your effective rate, which would underestimate the tax.

FICA and Medicare Components: Social Security tax is capped annually. If your salary alone exceeds the wage base ($168,600 for 2025), no additional Social Security tax is owed on RSU income. However, if your salary is below the cap, the RSU income may push you over, and the calculator applies 6.2% only up to the cap. Medicare tax of 1.45% applies to all wages with no cap. The Additional Medicare Surtax of 0.9% kicks in when total wages exceed the threshold ($200,000 single, $250,000 joint). This surtax is applied to the excess amount, not the entire RSU value.

State Income Tax: Most states tax RSU income as ordinary wages. Some states (e.g., California, New York, Oregon) have progressive brackets, while others (e.g., Colorado, Utah) use a flat rate. A few states (Alaska, Florida, Nevada, etc.) have no state income tax. The calculator applies the correct rate based on your selection, but note that some cities (e.g., New York City, Philadelphia) also impose local income taxes, which you may need to add manually if not listed.

Step-by-Step Calculation

First, calculate the total ordinary income from RSUs by multiplying the number of vested shares by the FMV per share. For example, 200 shares at $250 FMV = $50,000 income. Second, add this to your annual salary to find your total wages. If your salary is $120,000, total wages are $170,000. Third, determine the federal marginal tax bracket for the $170,000 total income (single filer). Using 2025 brackets, the 24% bracket applies to income between $100,525 and $191,950. Since $170,000 falls within this range, the marginal rate on the RSU income is 24%, but only the portion above $100,525 is taxed at 24%. The calculator accounts for this progressive nature, applying lower rates to lower tiers of the RSU income. Fourth, compute FICA: if salary is $120,000, Social Security cap is $168,600. The RSU income of $50,000 brings total to $170,000. Social Security tax is 6.2% on the $48,600 ($168,600 – $120,000) that falls under the cap, plus 1.45% Medicare on all $50,000. Since total wages ($170,000) are below the $200,000 surtax threshold, no Additional Medicare Tax applies. Fifth, apply state tax (e.g., 5.5% flat in Colorado) to the $50,000 RSU income. Finally, sum all taxes: federal ($12,000 approximate), Social Security ($3,013), Medicare ($725), state ($2,750) = total tax of $18,488. The calculator then deducts this from the gross RSU value to show net proceeds or net shares.

Example Calculation

To illustrate the practical application of our RSU Tax Calculator, consider a realistic scenario for a mid-career software engineer at a large tech firm. This example uses 2025 tax brackets and assumes the user is single with no other income sources.

Example Scenario: Sarah, a senior software engineer at a publicly traded company, receives a vest of 300 RSUs on December 15, 2025. The FMV on that date is $180 per share. Her annual base salary is $145,000. She lives in California (state tax bracket: 9.3% marginal for this income level). She selects “Sell-to-Cover” to automatically pay taxes. Her total ordinary income from RSUs is 300 × $180 = $54,000.

Step 1: Calculate total wages: $145,000 (salary) + $54,000 (RSU income) = $199,000. Step 2: Determine federal tax on the RSU portion. For a single filer in 2025, the 22% bracket runs from $47,150 to $100,525; the 24% bracket runs from $100,525 to $191,950; the 32% bracket starts at $191,950. Sarah’s salary of $145,000 already puts her in the 24% bracket. The RSU income of $54,000 falls entirely within the 24% bracket (since $145,000 + $54,000 = $199,000, which is above $191,950, but only the portion above $191,950 is taxed at 32%). The RSU income from $145,000 to $191,950 is $46,950 taxed at 24%, and the remaining $7,050 ($199,000 – $191,950) is taxed at 32%. So federal tax on RSUs = ($46,950 × 0.24) + ($7,050 × 0.32) = $11,268 + $2,256 = $13,524. Step 3: FICA taxes. Social Security cap is $168,600. Sarah’s salary of $145,000 is below the cap, so the first $23,600 of RSU income ($168,600 – $145,000) is subject to 6.2% Social Security = $1,463.20. The remaining $30,400 of RSU income ($54,000 – $23,600) is not subject to Social Security. Medicare tax of 1.45% applies to all $54,000 = $783. Total wages are $199,000, which is below the $200,000 surtax threshold for single filers, so no Additional Medicare Tax. Step 4: California state tax. California uses progressive brackets up to 13.3%. For a single filer with $199,000 total income, the marginal rate on the RSU income is approximately 9.3% (the rate for income between $68,350 and $342,854). State tax = $54,000 × 0.093 = $5,022. Step 5: Total tax = $13,524 (federal) + $1,463.20 (Social Security) + $783 (Medicare) + $5,022 (state) = $20,792.20. Net proceeds from the 300 shares at $180 FMV = $54,000 – $20,792.20 = $33,207.80. Under sell-to-cover, the broker sells approximately $20,792 worth of shares to cover taxes, leaving Sarah with net shares valued at $33,207.80 (about 184 shares deposited into her account).

This result means Sarah will owe $20,792 in total taxes on her RSU vesting. If she had not used the calculator, she might have assumed a flat 22% federal rate ($11,880) and been surprised by the additional $8,912 in FICA and state taxes. The calculator empowers her to adjust her W-4 withholding or set aside cash for the tax bill.

Another Example

Consider a different scenario: Mark, a married executive filing jointly, has a base salary of $250,000. He receives a vest of 1,000 RSUs on March 1, 2025, with an FMV of $75 per share. He lives in Texas (no state income tax). His total RSU income is $75,000. Total wages = $325,000. For 2025, the 24% bracket for married joint filers runs from $94,300 to $201,050; the 32% bracket from $201,050 to $383,900. Mark’s salary of $250,000 already places him in the 32% bracket. The RSU income of $75,000 is entirely taxed at 32% (since $250,000 + $75,000 = $325,000, which is below the 35% threshold of $383,900). Federal tax = $75,000 × 0.32 = $24,000. FICA: Social Security cap is $168,600. Mark’s salary of $250,000 already exceeds the cap, so no Social Security tax is owed on the RSU income. Medicare tax of 1.45% applies to all $75,000 = $1,087.50. Total wages of $325,000 exceed the $250,000 threshold for married joint filers, so the Additional Medicare Surtax of 0.9% applies to the excess $75,000 ($325,000 – $250,000) = $675. Total federal + FICA = $24,000 + $1,087.50 + $675 = $25,762.50. No state tax. Net proceeds = $75,000 – $25,762.50 = $49,237.50. This example shows how high earners in no-tax states still face significant Medicare surtaxes, a detail many overlook.

Benefits of Using Rsu Tax Calculator

An RSU Tax Calculator is not merely a convenience—it is an essential planning tool for anyone receiving equity compensation. The complexity of multi-layered tax codes, combined with the risk of underpayment penalties, makes manual calculation error-prone. This tool delivers five key advantages that directly impact your financial health.