RSU Tax Guide 2026: Vesting, Withholding and Selling Strategy
Table of Contents
How RSUs Are Taxed
Restricted Stock Units are taxed as ordinary income at vesting — not at grant. When 1,000 shares vest at $80, you have $80,000 of W-2 income that day, whether you sell or hold.
Your cost basis becomes the vest price ($80/share). Future gains/losses are capital — short or long-term from the vest date.
Double-trigger RSUs create the nastiest tax bill in equity comp. Your startup RSUs vest $200,000 of value at IPO; a 6-month lockup follows; the stock drops 40% — you now hold $120,000 of stock but owe ordinary income tax on $200,000. At 35%, that's $70,000 of tax on $120,000 of value, netting you $50,000. Sell the instant the lockup lifts. Hope is not a tax strategy, and the IRS doesn't accept "but it's worth less now" as a deduction.
Contrast with stock options: ISOs can convert the spread to long-term capital treatment (with AMT exposure); NSOs tax the spread as ordinary income at exercise, like RSUs. But RSUs have zero leverage — 1,000 RSUs at $80 = $80,000 of certain value, while 1,000 options with an $80 strike on $80 stock = $0. RSUs are deferred cash; options are lottery tickets. Plan RSUs like salary and options like venture bets — different instruments, different psychology.
The 22% Withholding Trap
Employers withhold a flat 22% federal on RSU income (37% above $1M). If you are in the 32-37% bracket, withholding falls short:
$80,000 vest, 35% bracket:
- Withheld: $17,600 (22%)
- Actually owed: $28,000 (35%)
- April surprise: $10,400
Fix: raise W-4 withholding or pay quarterly estimates. High earners get burned by this every year.
State withholding creates its own shortfall. California withholds 10.23% supplemental on equity comp — on an $80,000 vest that's $8,184, roughly matching a 9.3-12.3% actual liability, so Californians land close. But add New York City tax on top of state, and combined shortfalls on large vests routinely hit $5,000-$10,000. Look up your state's supplemental withholding rate rather than assuming the federal 22% tells the whole story — the April surprise has a state chapter too.
Use the safe harbor to avoid penalties: owe more than $1,000 at filing and you need 100% of last year's total tax paid in (110% if AGI exceeded $150,000). On the $80,000 vest at 35%: $28,000 liability minus $17,600 withheld = $10,400 gap → quarterly estimates of $2,600 each. Set calendar reminders for the January, April, June, and September estimate deadlines — the penalty for missing them is interest on the underpayment, month by month.
Sell at Vest vs Hold
| Strategy | Pros | Cons |
|---|---|---|
| Sell at vest | Locks value; diversifies; no extra tax complexity | Misses future upside |
| Hold | Potential growth; long-term gains after 1 yr | Concentration risk; single-stock exposure |
The diversification argument usually wins: your salary, bonus, and unvested RSUs already depend on this company. Holding vested shares doubles down. Most planners recommend selling at vest and diversifying — treat RSUs as cash compensation.
Apply the concentration rule mechanically: salary + bonus + unvested RSUs + vested shares = quadruple exposure to one company. If employer stock exceeds 10-20% of your net worth, trim on autopilot — sell 25% of every vest, no decisions required. Enron's employees learned the extreme version: the stock and the job can go to zero simultaneously. Diversification isn't pessimism about your company; it's recognition that your human capital is already 100% invested there.
Donate appreciated shares instead of selling: hold vested RSUs 1+ year, then donate $20,000 of stock with a $12,000 basis. You deduct the full $20,000 fair market value and permanently skip tax on the $8,000 gain. At 35%, that's $7,000 of income-tax savings plus ~$1,900 of capital-gains tax avoided = $8,900 of total value from shares you'd have sold anyway. For charitably inclined holders, it's the highest-value exit available.
Advanced: 83(b) Doesn't Apply, But...
- 83(b) elections apply to restricted stock, not RSUs — no early-tax option exists for RSUs.
- Double-trigger RSUs (startups): tax at IPO/acquisition trigger, often creating a massive single-year bill — plan liquidity.
- State taxes: Vesting while in California then moving doesn't escape CA tax on the income earned there — allocation rules apply.
- Net settlement: Most employers withhold shares for taxes ("sell to cover") — confirm enough was withheld for your bracket.
Quit timing has a price tag: unvested RSUs are forfeited the day you leave — $150,000 vesting next quarter vanishes if you resign this quarter. Negotiate start dates around vesting cliffs; a two-week delay can be worth $50,000+. Note the asymmetry: stock options typically give 90 days post-departure to exercise, but RSUs offer no such grace — unvested means unowned. Read the vesting schedule before the offer letter, not after the resignation.
Tender offers for private-company shares are taxed like any sale — long-term rates if you've held 1+ year from vesting (RSUs) or exercise (options). Two cautions: selling below the latest 409A valuation can raise eyebrows with the company, and clawback provisions in grant agreements can reclaim vested shares after misconduct or competitive departures. Read the actual grant agreement — not the HR summary — before assuming your vested shares are unconditionally yours.
Frequently Asked Questions
At vesting, as ordinary W-2 income based on the stock's fair market value that day — regardless of whether you sell.
Your employer sells enough vested shares to cover tax withholding, delivering the rest to you. Convenient but often under-withholds for high earners.
Generally no — you are already concentrated via salary and unvested grants. Sell, diversify, and treat proceeds as cash compensation.
RSUs always have value at vest (they're actual shares). Options can expire worthless if underwater; ISOs also offer special tax treatment RSUs lack.
Yes — supplemental wages including RSU vest income above $1M in a year face 37% mandatory withholding.