You search for an RSU tax rate and find 22%, 37%, or conflicting percentages — or your vest confirmation shows one withholding rate but your tax bill looks different. You want to understand effective tax on RSU vest income: federal, FICA, state, and why withholding rate is not the same as marginal tax.
Start here
What you need before using this
- confirmation with and rate shown.
- Annual salary and other expected income for the year.
- Filing status and state of residence.
- YTD wages from pay stub before the .
- tax or gap calculator for comparison.
Tax rates and brackets follow IRS and state rules for the filing year. Calculators provide planning estimates.
Why this happens
is ordinary wage income — taxed at progressive federal brackets like salary, not at one flat rate.
flat rates in IRS Pub. 15 are payroll convenience — 22% is common on portions under $1 million supplemental in a year.
Effective tax rate means total tax on the divided by — includes FICA and state, not federal income alone.
Social Security tax stops after you hit the SSA wage base — late-year vests may see lower FICA component.
Medicare applies to all wages; Additional Medicare Tax may apply above IRS threshold on combined wages.
State rates vary: California progressive tax, Texas and Washington no state income tax on wages, flat rates in some states.
Multiple vests push each dollar of later income into higher marginal brackets — effective rate rises through the year.
does not change taxable — it only funds tax from shares sold.
on next dollar of income differs from average effective rate on all income.
22% supplemental on can under- vs 32% or 35% marginal bracket when salary is high.
Bonus and in same pay period may use aggregate — effective rate differs from flat supplemental.
Estimated tax payments change cash effective rate timing — tax still follows bracket math.
NIIT may apply to investment income separately — wages themselves are not NIIT but can push AGI.
Tax software and calculators estimate effective components — pay stub after validates only.
tax rate searches often confuse label with annual liability — compare both.
What to check
- Federal supplemental rate on confirmation vs your marginal bracket.
- FICA lines on pay stub — Social Security cap status.
- State rate on if applicable.
- YTD Box 1 wages before and after .
- tax calculator output with full-year income.
- gap calculator for federal and state.
- Additional Medicare on high combined wages.
- Safe harbor if gap is large.
Using 22% as your RSU tax rate for the whole year
What to check in your documents
- confirmation percentage.
- Pay stub federal, FICA, and state lines.
- Prior vests YTD wage totals.
- at year-end for cumulative picture.
- Calculator assumptions for tax year selected.
$30,000 vest on $250,000 salary
Illustration only, not your tax situation.
Questions people ask
- What is the RSU tax rate?
- No single rate — effective tax combines federal marginal bracket on , FICA, and state tax. may use flat supplemental rates that differ from final liability.
- Is RSU tax rate 22%?
- 22% is a common federal supplemental rate on wages, not necessarily your final tax rate on those dollars.
- RSU tax rate vs capital gains rate?
- is ordinary wage income. Only price change after is when you sell — different rates apply to different events.
- How to calculate effective RSU tax rate?
- Estimate total tax on — federal, FICA, state — divided by . Use tax calculator with your full-year income.
- RSU tax rate California vs Texas?
- California adds progressive state tax on wages. Texas has no state income tax — federal and FICA remain. See state rate guides.
- Does RSU tax rate include FICA?
- Yes for planning — effective cash tax includes Social Security and Medicare on wages until wage base limits apply.
- Withholding rate vs effective tax rate?
- is what payroll takes at . Effective rate is total tax on income for the year — gap between them drives estimated payments.
- RSU tax rate on pay stub?
- Pay stub shows percentages, not final . Compare to calculator and year-end return.
- Which calculator shows RSU tax rate?
- tax calculator estimates components; gap calculator compares taken to estimated liability.
- Related guides?
- Why may be 22%, marginal tax rates, vs actual tax, and state rate guides.
When to get help from a tax pro
- Multiple states in year with unclear effective rate.
- pushes you into or NIIT territory.
- Self-employment income plus vests same year.
- Employer method unclear on confirmation.
Related calculators
- RSU Tax Calculator
Model federal and state taxes on your RSU vest, compare withholding to estimated tax, and see what you may keep.
- RSU Withholding Gap Calculator
Focus on the gap between what your employer withholds on RSU vests and what you may owe when everything is reconciled.
- Annual RSU Income Estimator
Total your expected RSU ordinary income for the year — a starting point before running detailed tax estimates.
Related pages
- Why Was My RSU Withholding Only 22%?
Employers commonly use flat supplemental rates on RSU vests. Your actual tax can be higher if you are in a higher bracket.
- RSUs and Marginal Tax Rates
RSU vest income stacks on salary — your marginal rate on that vest slice may be higher than flat withholding.
- RSU Withholding vs Actual Tax
Why flat supplemental withholding on RSU vests often differs from your actual tax when salary, bonus, and vests stack in one year.
- How RSUs Are Taxed
RSUs are usually taxed as wages when they vest, not when the grant is signed. This guide walks through the timeline in plain terms.
- RSU Withholding at Vest Explained
RSU withholding at vest is payroll tax on vest FMV — often supplemental federal rates plus FICA and state — not necessarily your final marginal tax.
Sources and notes
Primary tax claims on this page are supported by the official and secondary sources below. Broker and software links describe reporting mechanics — confirm rules against IRS or state guidance.
Supplemental withholding vs marginal tax on RSU vest wages; FICA and state layers.
- IRS Publication 15 (Circular E) — Supplemental wages
Internal Revenue Service · Official
Section 7 describes supplemental wage withholding, including the optional 22% flat rate and 37% rate above $1 million of supplemental wages in a calendar year.
- IRS Publication 525 — Taxable and Nontaxable Income
Internal Revenue Service · Official
Covers compensation income from stock-based pay, including restricted property under section 83.
- IRS Tax Withholding Estimator
Internal Revenue Service · Official
Tool to estimate whether paycheck withholding (including supplemental events) will cover annual tax liability.
For learning, not filing
VestingTax.com is not a CPA firm or tax preparer. Grants, employers, and states all differ. Use the cited IRS and state sources above, your own documents, and a qualified tax professional before you make decisions from this guide.