RSU Cliff Vesting: What Happens on Your 1-Year Date

Most tech employees know they have a "1-year cliff" but don't know what it means for their taxes until April surprises them. Here's what actually happens — and what to do about it.

What Is Cliff Vesting?

A vesting cliff is a waiting period before any of your equity becomes yours. At most tech companies, RSU grants use a 4-year vesting schedule with a 1-year cliff:

• Months 1–11: 0% vested. If you leave, you receive nothing.
• Month 12 (the cliff): 25% vests all at once.
• Months 13–48: the remaining 75% vests in equal quarterly installments (6.25% per quarter).

The cliff exists to protect the company — it filters out employees who leave quickly while giving those who stay a predictable equity schedule.

Your Vesting Schedule by Quarter

For a grant of 10,000 RSUs, here's the standard schedule:

Some companies vest monthly after the cliff; some vest bi-annually or annually. Read your grant agreement — "quarterly" is most common but not universal.

The Cliff Date Is a Taxable Event

When RSUs vest, you receive stock. The IRS treats the fair market value of those shares on vest day as ordinary income — the same as your salary.¹ You owe income tax, Social Security, and Medicare on the full value at delivery, whether or not you sell the shares.

This income is reported in Box 1 of your W-2. It gets stacked on top of your base salary when calculating your marginal tax rate for the year.

The Withholding Gap — Why Most People Get Surprised

By default, your employer withholds federal tax on RSU vests at the 22% supplemental flat rate.² This is the same rate used for bonuses. It sounds reasonable — until you realize that most tech employees with $180K+ in base salary are already well above the 22% bracket by the time any RSU income arrives.

Social Security and Medicare add another layer. If your salary hasn't already exceeded the 2026 SS wage base of $184,500, RSU income below that threshold also triggers 6.2% Social Security withholding.³ Medicare (1.45%) applies to the full amount, plus an additional 0.9% on compensation above $200,000 (single).

The result: high-earning tech employees frequently owe an additional $15,000–$50,000 in April after their first cliff vest — not because they did anything wrong, but because the withholding system was designed for supplemental wages, not for equity events that rival or exceed their salary.

What to Do Before Your Cliff Date

1. Calculate the tax gap now

Don't wait until April. In the months before your cliff, run the math:

• Estimated shares × current price = vest value
• Vest value × (marginal rate − 22%) = rough federal gap
• Add state gap if you're in CA, NY, or another high-tax state

Use the RSU Tax Calculator to model this with your specific income and vest details.

2. Cover it via W-4 adjustment or estimated tax payment

Two ways to pay the gap before April:

• Increase W-4 withholding on your paycheck for the remainder of the year. File a new W-4 with a higher "additional withholding" amount in Step 4(c) so the difference comes out of your regular paycheck.
• Make a quarterly estimated tax payment to the IRS (via EFTPS) and to your state. After a cliff vest, you'll typically owe the Q2 payment in June and the balance in Q4. See the RSU Estimated Tax guide for the exact safe harbor rules and due dates.

3. Decide: sell immediately or hold?

Your company's stock price on cliff day determines your ordinary income — you've already been taxed on that. What happens after that is a capital gains decision.

• Sell immediately: Any gain over vest-day price is near zero. No capital gains tax. Simple, no concentration risk.
• Hold for 12+ months: If the stock appreciates, you convert that gain to long-term capital gains (15–20% federal, versus 32–37% ordinary). But you take on single-stock concentration risk.

For most employees at the cliff date, the right move is to sell enough to cover the tax gap and decide deliberately about the remainder. The sell-vs-hold guide walks through the break-even math.

Pre-IPO Company: The Double-Trigger Cliff

If you're at a private company, your RSUs almost certainly have double-trigger vesting: shares only deliver when (1) the time-based cliff is met AND (2) a liquidity event occurs (IPO or acquisition). How double-trigger RSUs work is explained in full here.

The practical implication: your cliff date passes, you've "earned" those 2,500 shares on paper, but no income tax event occurs yet. The income tax clock starts only when the second trigger fires and shares are delivered. This can compress a large vest and tax hit into a single year around an IPO.

Joined Mid-Year? How Your Cliff Adjusts

Many companies run RSU grant cycles quarterly. If you join in October but grants are issued in January, you may receive your first grant in January of the following year. In that case, your cliff date is January of the year after that — effectively a 15-month wait from your start date, not 12.

Some companies address this with a "stub grant" (a small initial grant at hire, separate from the main annual cycle). Read your offer letter carefully: the grant date listed there is when the 12-month clock starts, not your employment start date.

Thinking About Leaving Before the Cliff?

Unvested RSUs are forfeited at termination — with no pro-ration — unless your grant agreement includes an acceleration clause (uncommon for individual contributors; more common for executives).

The calculation is straightforward but psychologically charged:

• Unvested shares × current FMV = after-tax walkaway cost (at current price)
• If you're 10 months in with an 11-month cliff on 2,500 shares at $50, that's $125,000 you're leaving on the table

New employers sometimes offer a sign-on bonus sized to replace unvested equity — but they rarely match it dollar-for-dollar, especially for cliff-pending grants where they see high near-term cost. Use the Golden Handcuffs Calculator to see the real after-tax walkaway cost and negotiation math.

Refresher Grants and the Compounding Cliff

At most large tech companies, you receive annual refresher grants — new RSU grants each year, typically with their own 4-year schedules and 1-year cliffs. By year two, you have two overlapping vesting ladders. By year four, four. This creates predictable quarterly vest income — but also quarterly tax events that require consistent estimated tax planning, especially as base salary plus RSU income climbs into the 35%+ range.