1. The Lifecycle of an RSU Grant: From Offer Letter to Vesting

An RSU grant is a commitment by an employer to grant shares of company stock to an employee according to a predefined vesting schedule. A standard schedule follows a 4-year vesting period with a 1-year "cliff" (where 25% of shares vest after 12 months, followed by quarterly or monthly vesting thereafter).

Unlike stock options—which require an employee to pay a strike price to exercise the option—RSUs carry zero purchase price. On the date of vesting, the employee receives the full Fair Market Value (FMV) of the vested shares. However, this vesting event triggers an immediate taxable event in almost every major tax jurisdiction worldwide.

2. Tax Event #1: Vesting Tax Withholding & Perquisite Rules

On the exact calendar date an RSU vests, the total gross value ($\text{Vested Shares} \times \text{Fair Market Value at Vest}$) is recognized as ordinary income (or perquisite income). Employers are required by law to withhold taxes immediately upon vesting.

Employers handle withholding through one of three methods:

• Sell to Cover (Default): The broker automatically sells a portion of the vested shares on the open market to cover the required tax withholding, depositing the remaining net shares into the employee's brokerage account.
• Cash Transfer: The employee pays the required tax withholding out-of-pocket from cash savings, retaining 100% of the vested shares.
• Same-Day Sale: The employee immediately liquidates 100% of the vested shares on the vesting date, deducting tax withholding and receiving the remaining cash.

3. The Statutory Withholding Shortfall Risk

A common trap for high-earning tech professionals is the statutory withholding rate shortfall. In the United States, federal supplemental tax withholding on RSU vesting under $1,000,000 is capped at a flat 22%. However, employees in top income brackets (32%, 35%, or 37% federal plus state taxes in California or New York) face a substantial tax gap.

If an employee's marginal tax bracket is 37% plus 10% state tax (total 47%), but the employer only withholds 22% at vest, the employee will owe an additional 25% in unpaid income taxes when filing annual tax returns. Failing to account for this shortfall can lead to underpayment penalties and surprise tax bills.

4. Tax Event #2: Capital Gains Tax on Post-Vest Price Appreciation

If an employee decides to hold net vested shares rather than selling them immediately, any subsequent change in share price creates a second tax event upon liquidation.

If the share price increases between vest and sale, the gain is taxed as a short-term capital gain (held ≤ 1 year) or long-term capital gain (held > 1 year). If the share price declines below the vest price, the employee incurs a capital loss, which can offset other capital gains or up to $3,000 of ordinary income per year in jurisdictions like the US.

5. International Tax Rules for US RSUs Held by Indian Tech Professionals

For Indian engineers and executives working for US subsidiaries (or holding US-listed equity), foreign RSU grants are governed by Indian Income Tax Act rules:

• Perquisite Tax at Vesting: The FMV of shares on the vesting date (converted to INR at the SBI Telegraphic Transfer Buying Rate) is taxed as perquisite income under Section 17(2) at the employee's slab rate (up to 30% + surcharge & cess ~ 31.2% to 39%).
• Foreign Tax Credit (FTC): If US taxes were withheld by the employer broker, Indian tax residents can claim FTC under Section 90/90A by filing Form 67 before submitting annual tax returns.
• Capital Gains Tax at Sale: Unlisted foreign shares held ≤ 24 months incur Short-Term Capital Gains (STCG) taxed at individual slab rates. Foreign shares held > 24 months incur Long-Term Capital Gains (LTCG) taxed at 12.5% (post-2024 tax reform).

6. Comprehensive Worked Example: Step-by-Step Liquidation Math