RSU Tax Calculator at Vesting

A restricted stock unit is an unfunded promise to deliver shares once a vesting condition is met. Because there is no purchase price, the entire fair market value on the vesting date is compensation. That amount enters Box 1 of the W-2 and is subject to federal income tax at the recipient's marginal rate, state income tax, Social Security at 6.2 percent up to the annual wage base, and Medicare at 1.45 percent with no cap, plus the 0.9 percent Additional Medicare Tax above 200,000 dollars of wages for a single filer. The vest-date value also becomes the cost basis, and the holding period for capital gains starts that day, not at grant. This calculator applies a flat marginal bracket to the vest value, models sell-to-cover or net settlement withholding at a chosen rate, and then treats appreciation between vest price and sale price as a separate gain taxed at 15 percent. The gap between withholding and liability is the central issue in practice. Employers default to the 22 percent supplemental rate, but a recipient in the 35 percent federal bracket living in California, where the top rate is 13.3 percent, faces a combined burden near 50 percent, leaving a large balance due at filing. Two simplifications matter here: the 15 percent capital gains rate assumes a long-term holding and a middle income band, whereas short-term sales are taxed at ordinary rates and high earners face 20 percent plus the 3.8 percent net investment income tax; and the Social Security component is charged in full without regard to wages already earned.

Restricted stock itself is old, but the unit form is a product of accounting and tax reform. Through the 1990s, technology employers overwhelmingly granted stock options, because Accounting Principles Board Opinion 25, issued in 1972, allowed a company to report no compensation expense for an at-the-money option while restricted shares produced a visible charge. Section 83 of the Internal Revenue Code, added by the Tax Reform Act of 1969, governed the taxation of property transferred for services and gave recipients of actual restricted shares the option, under section 83(b), to elect taxation at grant. Two events reversed the preference. The Sarbanes-Oxley Act of 2002 and the option backdating investigations that followed made options politically costly, and after Microsoft announced in July 2003 that it would replace option grants with restricted stock, the shift accelerated across the sector. FASB Statement No. 123R, issued in 2004 and effective for most public companies in 2006, required all share-based payments to be expensed at fair value, erasing the accounting advantage options had enjoyed. Employers moved to units rather than shares because a unit is a contractual right that avoids issuing stock and paying tax before delivery. Section 409A, enacted by the American Jobs Creation Act of 2004 in the wake of the Enron collapse, then fixed the deferred compensation rules that make RSU income recognizable at settlement and constrain any attempt to defer it.