How RSUs Are Taxed in 2026 — Vesting, Withholding Traps, and What High Earners Need to Know
- Tax Wealth Consultant
- Jul 29
- 5 min read
For tech professionals, executives, and other high earners across Irvine and Orange County, restricted stock units are often the largest single line of compensation — and the most misunderstood at tax time. RSU taxes arrive in two separate stages, the default tax withholding is frequently too low for high-bracket employees, and one common brokerage reporting quirk causes people to pay tax on the same income twice. This guide explains how RSU income is actually taxed, where the traps sit, and the tax planning questions worth answering before your next vesting date.
What Restricted Stock Units Are (and What They Are Not)
Restricted stock units are a promise from your employer: deliver a set number of company shares once vesting conditions are met — typically time-based over several years, sometimes tied to performance. Until vesting occurs, you own nothing and owe nothing; there is no tax at grant.
One correction worth making early, because it is a common misconception: the Section 83(b) election — which lets recipients of restricted stock awards choose to be taxed at grant — is not available for RSUs. If your equity compensation arrives as units rather than actual restricted shares, there is no election to file. The tax timeline is fixed: vesting first, sale second.
At private companies, RSUs often carry a second condition — a liquidity event such as an IPO or acquisition — which is why employees can hold these “double-trigger” units for years with no tax consequence until both conditions are met.
Tax Event #1 — Vesting: Ordinary Income on Your W-2
When RSUs vest, the fair market value of the delivered shares is treated as ordinary compensation income — the same as salary or a bonus. That value is reported on your W-2 and is subject to federal income tax, state income tax, and payroll taxes, including Medicare and, above the statutory wage thresholds, the Additional Medicare Tax. California taxes vested RSU income as wages at regular state rates.
This happens whether or not you sell a single share. If 1,000 units vest on a day the stock trades at $150, you have $150,000 of wage income for the year — even if you hold every share.
The Withholding Trap — Why High Earners Come Up Short
The IRS treats RSU income as supplemental wages, and employers generally withhold federal tax on supplemental wages at a flat 22% — moving to the top 37% rate only once supplemental wages exceed $1 million for the year. Here is the problem: many professionals with significant equity compensation sit at a marginal federal rate well above 22% long before the $1 million mark. The default sell-to-cover transaction — where the broker sells a slice of the vesting shares to fund the tax withholding — covers only that flat rate.
The result is a gap between what was withheld and what you actually owe, and the gap surfaces as a balance due at filing — potentially with underpayment penalties if estimated payments were not made along the way. An RSU tax calculator can give you a first estimate of that gap, but even the best RSU tax calculator only knows what you type into it: it does not see your spouse's income, your other investment activity, or your full state picture. Treat a calculator as a screening tool; treat the vesting schedule as the real tax planning calendar.
Closing the gap is straightforward once it is measured: increase the withholding on your regular salary for the remainder of the year, or make quarterly estimated payments to the IRS and, in California, the Franchise Tax Board on the regular schedule. What does not work is discovering the shortfall the following April.
Vesting this year — and not sure your withholding will cover it?
Schedule a confidential 30-minute consultation with Tax Wealth Consultant.
taxwealthconsultant.com | (949) 409-8335
Tax Event #2 — Selling: Capital Gains and the Double-Tax Trap
Once vested, your shares behave like any stock bought on the open market. Your cost basis is the fair market value at vesting — the amount already taxed as wages. Sell above that basis and the profit is taxed as capital gains: short-term at ordinary rates if held a year or less after vesting, long-term at preferential rates if held longer. Sell immediately at vesting and there is usually little or no gain to tax. This second stage of RSU taxes is where most filing errors happen.
The trap: brokerage Form 1099-B frequently reports a zero cost basis for RSU shares. If a return is filed straight from the 1099-B, the vesting value gets taxed a second time — once as wages, once as capital gains. The correct basis lives in the broker's supplemental information statement, and adjusting for it is routine — but only if whoever prepares the return knows to look.
Where RSUs Fit in the Bigger Tax Picture
Vested equity compensation does not exist in a vacuum. A large vesting year can push other income into higher brackets, raise the rate applied to your long-term capital gains and dividends, and change the math on charitable giving and retirement contributions. Coordinating restricted stock units and other concentrated positions with the rest of your portfolio raises the same questions we cover in our guides to tax loss harvesting and retirement income tax planning. And if you own a business alongside your W-2 equity income, a heavy vesting year interacts with the QBI deduction as well.
Honest framing matters here: nobody can tell you whether your company's stock will rise after vesting, and no strategy changes the fact that vesting itself is taxable. What tax planning can do is make the withholding accurate, the estimated payments timely, the basis correct, and the sale timing deliberate.
Before your next vesting date, three questions are worth answering:
What will this vest do to my marginal federal and California rate?
Is my combined withholding on track, or is an estimated payment due this quarter?
If I intend to hold the shares, am I clear that holding changes only the capital gains treatment of future movement — not the wage tax already owed?
How Tax Wealth Consultant Approaches RSU Planning
For clients with meaningful equity compensation, Tax Wealth Consultant builds the RSU picture into the full return: we project the vesting calendar against your real marginal rate, quantify the tax withholding gap before it becomes a penalty, run the numbers a generic RSU tax calculator cannot, correct 1099-B basis reporting so no dollar is taxed twice, and coordinate heavy vesting years with capital gains, charitable, and retirement decisions. RSU taxes are predictable when someone is watching the calendar — most surprises are simply the absence of tax planning.
Your next vest is already on the calendar. Your tax plan should be too.
Schedule your confidential 30-minute review with Tax Wealth Consultant today.
taxwealthconsultant.com | (949) 409-8335
Tax Wealth Consultant provides tax planning, tax preparation, and wealth advisory services for business owners, professionals, and investors in Irvine, Orange County, and beyond.
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