In plain terms
How the tax works
Your first converts a promise into shares, and that value is treated as wage income.
often uses a flat supplemental rate, which may not match your actual rate.
Many plans sell some shares automatically to cover , which can look alarming the first time.
The tax happens at whether or not you sell, so reading your stub matters.
What to check on your end
- Your confirmation, shares vested, shares sold for tax, net shares.
- Your pay stub for the added wages and .
- Whether the flat rate fits your situation.
- The price, which becomes your later.
- Whether to sell or hold your first vested shares.
Common mistake
Example scenario (hypothetical)
Illustration only, not your tax situation.
When a CPA is worth it
- Your first is large relative to your salary.
- You are unsure whether to sell or hold.
- You moved or worked remotely during the year.
- Your pay stub does not seem to match your .
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.
Employee equity tax planning context — not role-specific tax law.
- 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.
- Equity Compensation — RSU taxation at vest and on sale
Charles Schwab (Workplace Financial Services) · Brokerage explainer
Plain-language explainer: RSU value at vest on W-2, FICA, withholding may not cover full tax, separate capital gains on sale.
Related calculators
Related pages
- What Happens When RSUs Vest?
On vest day your employer typically reports wage income, withholds tax, and may sell shares — here is what to expect.
- RSU Tax Checklist Before a Vesting Date
A short checklist so vest day is not a surprise — confirm withholding settings and whether you need extra cash on hand.
- 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.
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.