RSU Vesting Calculator (Net Value After Tax)
Live- RSUs are taxed as ordinary income at vest. The tax rate input should reflect your federal + state + FICA marginal rate.
Restricted Stock Units vest over a schedule, typically with a one-year cliff followed by monthly or quarterly vesting until a four-year total. Until each tranche vests, the shares are a contingent promise rather than your property. At vest, the fair-market value of the newly-vested shares becomes ordinary income on your W-2 and is taxed at your federal-plus-state-plus-FICA marginal rate.
This calculator takes total shares granted, the grant-date share price, vesting schedule (cliff months, total months), months elapsed since grant, expected annual stock growth, and your marginal tax rate. It returns the number of shares vested so far, the gross value at the projected current price, the net value after ordinary income tax, the number of shares still unvested, and the annual vesting pace going forward.
A rough sanity check: a 1,000-share grant at $100, 1-year cliff and 4-year total, 18 months elapsed with 8 percent annual growth and 32 percent tax rate vests 375 shares to date, projected current price about $112, gross value $42,000, net after tax about $28,500. Pre-cliff (8 months elapsed) the vested value is zero because no shares have vested yet; the cliff is a take-it-or-leave-it gate. After the cliff, vesting is typically linear month by month or quarter by quarter for the remainder of the schedule.
The tax treatment of RSUs is simpler than ISOs or NSOs but easy to get wrong. At vest, your company withholds a default percentage (often 22 percent federal, regardless of your actual marginal rate) by selling some of the newly-vested shares. If your actual marginal rate is higher than 22 percent (most senior employees), you owe more at tax filing. Plan to set aside the difference (your marginal rate minus 22 percent times the vested gross value) in a separate account when the shares vest. Failing to do this is the most common RSU tax-time surprise.
How RSU vesting schedules typically work
The standard pattern at most tech companies is a 4-year total vesting period with a 1-year cliff and monthly or quarterly vesting thereafter. At the cliff date, 25 percent of the grant vests in a single tranche; the remaining 75 percent then vests in equal monthly or quarterly increments over the next 36 months. Some companies use different schedules: 5-year total, backloaded (smaller percentage in early years, larger in later years), front-loaded (the opposite), or with double-trigger acceleration on certain events.
Double-trigger acceleration is worth understanding. Most pre-IPO grants vest only when both (a) the time-based vesting schedule is met and (b) a liquidity event (IPO or acquisition) occurs. The second trigger protects the company from issuing tradeable shares before the company is public; for the employee it means RSUs that look like they have vested may not actually be transferable or sellable until the IPO. After IPO, most companies move to standard single-trigger vesting.
Tax mechanics at vest
At each vesting event, the fair-market value of the newly-vested shares is included as ordinary income on your W-2. Your employer withholds federal tax (often at the supplemental wage rate of 22 percent, sometimes higher for grants over $1 million), state tax, Social Security, and Medicare. The withholding is typically done by selling some of the newly-vested shares automatically (called sell-to-cover).
If your actual marginal federal rate is higher than 22 percent (which is the case for most filers with substantial RSU income, especially in higher tax brackets), the 22 percent default withholding leaves a shortfall at tax filing. Calculate the gap (your marginal rate minus 22 percent times the gross vested value) and set it aside in a separate account at each vesting event.
After vest, your basis in each share is the fair-market value at vest (the same amount that was included as ordinary income). If you hold the shares and they appreciate further, the gain above basis becomes long-term or short-term capital gain depending on how long you hold from the vest date.
Sell-at-vest versus hold
Financial advisors typically recommend selling RSUs at vest and diversifying the proceeds, on two grounds. First, you already have substantial exposure to your employer through your salary and continuing equity grants; concentrating wealth in the same employer adds correlation risk that diversification eliminates. Second, the tax treatment is already locked in as ordinary income at vest, so holding does not produce any tax benefit; if the stock drops after vest, you owe the same tax on the higher pre-drop value.
The argument for holding is conviction that the stock will outperform a diversified market. This is sometimes appropriate (Amazon and Google employees who held for years became much wealthier than those who diversified) but is statistically the minority case. For most employees at most companies, sell-at-vest is the optimal default.
What this calculator does not include
Double-trigger acceleration logic for pre-IPO grants (where vesting is contingent on both time and a liquidity event). Performance share units (PSUs) where vesting depends on company performance metrics. Restricted stock awards (RSAs) which have different tax treatment via the 83(b) election. Stock options (ISO and NSO) which have different vesting mechanics and tax treatment. ISO AMT calculation. The actual share price (the calculator projects from grant price using an annual growth assumption; a real share price input would be more accurate). Section 16 insider trading restrictions for officers and directors. Lock-up periods after IPO. For pre-IPO grants and equity packages with PSUs or options mixed in, build a more comprehensive equity model; this calculator handles the standard public-company RSU case.
Setting aside the tax shortfall
The single most useful habit for RSU holders is setting aside the tax shortfall at each vesting event. Compute your marginal rate (federal + state, FICA already withheld in full) and subtract the 22 percent default withholding. That percentage of gross vested value is your shortfall to set aside.
Example: $50,000 of RSU value vests, your marginal federal rate is 32 percent, your state is 5 percent. Total marginal is 37 percent. Default withholding was 22 percent federal plus your state (sometimes also lower than marginal). Shortfall is approximately 32 minus 22 plus state-shortfall, so about 12 percent. Set aside $6,000 in a savings account labelled 'tax owed.'
Doing this every vest prevents the all-too-common April tax bill surprise that catches first-time RSU holders off guard.
Frequently asked questions
The IRS supplemental wage rate for federal withholding is 22 percent up to $1 million of supplemental wages per year and 37 percent above. Most employers default to this rate for RSU vesting events regardless of your actual marginal rate. If your marginal is higher (32, 35, or 37 percent), you owe the gap at tax filing. Set aside the difference at each vest.
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