RSU Vesting Schedules, Tax Timing
& Sell-to-Cover Strategies

The schedules you'll actually encounter

An RSU grant is a promise: stay employed, hit the dates, and shares convert to real stock you own. The grant itself does nothing on your tax return. What matters is the vesting schedule — the calendar that controls when those shares become yours, and therefore when they become taxable. If you're new to the mechanics, start with what restricted stock units are.

The dominant pattern at big tech — Google, Meta, Amazon, Nvidia — is the 4-year schedule with a 1-year cliff. Nothing vests for the first 12 months. On your one-year anniversary, 25% vests in a single lump. After that, the rest vests on a recurring drip — monthly or quarterly — over the remaining three years. Amazon famously back-loads (5/15/40/40), but the cliff-then-drip shape is the norm.

That last one trips people up. At a pre-IPO company, your RSUs are double-trigger: the time condition can be fully satisfied, but if there's been no liquidity event, nothing is taxable yet. Then the company IPOs and several years of vested-but-untaxed shares all become income on the same date — a massive single-year spike that wrecks unprepared withholding. Read the schedule terms in your grant agreement, not the offer letter summary.

Why the vest date — not the sale date — is when you owe

Here's the rule that governs everything: RSUs are taxed as ordinary income at vest. Not at grant. Not when you sell. The moment shares vest, their full market value is compensation — exactly as if your employer handed you a cash bonus and you immediately bought stock with it. The taxable amount is simple: shares vested × FMV at vest. That figure lands in W-2 Box 1, and you owe ordinary income tax on it whether you sell a single share or not.

Your cost basis is the FMV at vest — the amount already taxed as income. When you eventually sell, your capital gain or loss is just sale price minus that basis. Sell more than a year after the vest date and any gain is long-term. This matters because brokers (Schwab, E*Trade, Fidelity) frequently report your basis as $0 on the 1099-B, which would make you pay tax twice on the same income. For the fix — adjusting basis on Form 8949 — see how RSUs are taxed.

One more clarification engineers ask about constantly: W-2 Box 14. If you see a line labeled "RSU" there showing your vested value, that's informational only. It's already included in Box 1 — it is not a second tax. Don't add it anywhere.

Sell-to-cover, net-share, and cash — in depth

Because vesting creates ordinary income, your employer must withhold tax — and there are three ways to fund it. Which one you get is usually set by the company plan, not by you, but understanding each tells you exactly what's happening to your shares on vest day.

Sell-to-cover is the most common default. On vest day the broker sells just enough shares to cover the withholding, deposits that cash with your employer's payroll, and leaves the rest in your account. You do nothing. The downside: you have no say over the price the cover-shares sell at, and the slice sold is itself a (tiny) capital transaction with basis equal to FMV at vest — usually a near-zero gain since you sell almost immediately.

Net-share (share withholding) is cleaner on paper: the employer simply never delivers the shares used for tax — there's no open-market sale, so no transaction on your end at all. Cash transfer is the rarest and most aggressive: you keep every vested share and pay the entire withholding out of pocket. Only do this if you have the cash and genuine conviction — otherwise you're funding a concentrated bet with your savings.

Why 22% leaves high earners with a surprise bill

This is the single most common RSU tax surprise. Federal law treats RSU vesting as a supplemental wage, and the default flat withholding rate on supplemental wages is 22% (rising to 37% only on the portion of supplemental wages above $1M in a year). That 22% is fine if you're in the 22% bracket. But a senior engineer at Google or Nvidia is usually in the 32–37% marginal bracket — so the company withholds 22% while you actually owe 32–37%. The 10–15 point gap is real cash you'll owe at filing.

The discipline question for every vest

After withholding, you're left with net shares. The decision — sell now or hold — feels emotional, but there's a clean framing that strips the emotion out: "Would I buy this stock today, at this price, with cash?" If you just received a cash bonus, would you put it all into NVDA at today's price? If the honest answer is no, then holding the vested shares is the same bet — you're just anchored because you didn't have to actively choose it.

Because your basis equals FMV at vest, selling at (or near) vest is almost tax-neutral on the sale itself — there's little to no capital gain. The big ordinary-income tax already happened. That's what makes "sell-at-vest discipline" so powerful: you can diversify out of a single name at minimal extra tax cost, right when shares land. Wait, and any gain becomes a fresh decision tangled up with capital-gains math and loss aversion.

If you've already accumulated a large vested position you don't want to dump — high conviction, or selling would mean realizing years of gains — that's a genuine fork. You can sell and diversify, use direct indexing, or generate income on the position without selling at all. Embark's approach to concentrated RSU stock uses an IRS §721 SPV to produce income on the shares while you keep your upside and avoid a new tax event — useful when the holding-vs-diversifying tension is real.

When tranches stack and the vesting never stops

Your first grant isn't the whole story. Most companies issue refresh (refresher) grants every year — new 4-year RSU awards layered on top of the ones still vesting. By year two or three you have multiple grants vesting simultaneously, each with its own cliff, drip, and FMV-at-vest basis. The result is a near-continuous stream of taxable events and a steadily growing concentrated position if you never sell.

Overlapping tranches make the under-withholding gap worse — more total supplemental income at 22% default means a bigger annual shortfall — and they make concentration creep silent. The fix is a standing playbook instead of one-off decisions. Handle every vest the same way.

Common RSU vesting and withholding questions

Do I owe tax when RSUs are granted?
No. A grant is just a promise of future shares. You owe ordinary income tax only when shares vest — shares vested × FMV at vest, added to W-2 Box 1. Sale is a separate, later event.

What exactly is sell-to-cover?
On vest day your broker automatically sells a portion of the just-vested shares to raise the withholding tax, then leaves the remaining shares in your account. You front no cash, but you don't control the cover-sale's price or timing.

Why do I still owe tax in April if my company withheld at vest?
Because the default supplemental withholding rate is 22%, while high earners are often in the 32–37% bracket. The 10–15 point gap (plus state and the 0.9% additional Medicare) comes due at filing. Cover it with estimated payments. See how RSUs are taxed.

Should I sell my shares at vest or hold them?
Ask: would I buy this stock today, with cash, at this price? Selling at vest is nearly tax-free (basis = FMV at vest), so it's the cheapest moment to diversify. Hold only with a written thesis and a concentration limit. Run the math in the calculator.

Why are my private-company RSUs not taxed yet?
They're likely double-trigger: both the time-based schedule and a liquidity event (IPO/acquisition) must occur before they vest for tax purposes. When the liquidity event hits, a backlog of shares can all become income in one year — plan withholding accordingly.

I have years of vested shares I don't want to sell. What are my options?
Sell-and-diversify, direct indexing, or generating income on the position without selling. For the last route, see diversifying concentrated RSU stock — an §721 income strategy keeps your upside and avoids a fresh tax event.