The RSU Tax Trap When the Stock Drops: Taxed at $150, Sold at $30, Deducted at $3,000 a Year.

A staff engineer's RSUs vest all through a banner year at prices between $140 and $160, and she holds every share, because selling the stock that made the last two years feel so good seems like a bet against her own company. Eighteen months later the company misses twice, cuts a quarter of the workforce, and her badge stops working the same week the stock finds $30. She sells because she needs the cash. That is the RSU tax trap when the stock drops: the IRS taxed the shares as wages at $150, the market paid her $30, and the tax code refuses to let those two numbers meet.

The trap is built from two rules that are each reasonable alone. First, when RSUs vest, the full market value of the delivered shares is compensation: it lands in box 1 of your W-2, it is taxed at your ordinary rates up to 37%, and your basis in the shares becomes that vest-date value. Your employer withholds on the vest at the flat 22% supplemental rate (37% only above $1 million of supplemental wages), which for anyone in the 32% to 37% brackets means the vest arrives pre-loaded with an April balance due. Second, once the shares are yours, they are just stock. Whatever happens next is capital gain or capital loss, and capital losses live under §1211(b): they offset capital gains without limit, but only $3,000 per year of ordinary income ($1,500 married filing separately).

Income in at ordinary rates, loss out through a capital-loss keyhole. The system never trues up. There is no recomputation of the W-2, no claim-of-right relief under §1341, because you were never required to repay anything, and no equivalent of the AMT credit that eventually gives ISO exercisers some of their money back. The vest-year tax is final the moment the return is filed, no matter what the stock does afterward.

Read the two emphasized lines together. The engineer paid $84,000 of tax to keep shares that returned $42,000. Her true economics on those shares are negative even before the layoff cost her the paycheck. The $168,000 capital loss is real, but it is trapped: with no capital gains to absorb it, §1211(b) meters it out at $3,000 a year for 56 years, and the carryforward is personal. Under Rev. Rul. 74-175, whatever she has not used when she dies simply evaporates; her heirs and her estate get nothing from it. A worthless-securities deduction under §165(g) does not rescue the character either, because that loss is still capital, and it requires the stock to be actually worthless, not just down 80%.

What makes this a trap rather than bad luck is correlation. A tech employee holding vested shares is not running one risk but four stacked copies of the same risk: the salary, the unvested grants, the vested shares, and often an ESPP position all depend on the same company. Companies cut staff when performance drops, and performance drops are why the stock is down, so the layoff and the trough arrive as a package. The 2022 drawdown ran exactly this script, with dozens of listed tech companies down 70% or more from their vest-window highs while running layoff rounds. The moment you most need to sell, because the W-2 income just stopped and COBRA starts next month, is reliably the worst tax and price moment to do it. Diversification is not really a returns decision for equity-comp earners. It is severing the link between your employer's next earnings call and your entire balance sheet.

The clean escape is structural, and it only works in advance: sell at vest, by standing instruction, every time. Because basis equals the vest-date value, a same-day sale produces little or no gain, so the sale adds almost nothing to a tax bill the vest already created. Holding, by contrast, is economically identical to receiving a cash bonus and spending all of it on employer stock, which almost nobody would do deliberately. Most equity plans offer an auto-sale election; turning it on converts the whole problem into a payroll event. The proceeds then fund the missing withholding first, since the 22% flat rate rarely covers a real bracket, and a diversified portfolio second. You can sanity-check the withholding gap with our RSU tax calculator.

If you are already concentrated, the unwind is a schedule, not a single trade: a fixed number of shares each month or quarter, set in writing, with a Rule 10b5-1 plan if you are ever near inside information. Pair the sales so gains and losses land in the same year, since a carryforward is used dollar for dollar against gains under §1212(b), which is how a six-figure trapped loss actually gets consumed, absorbing the gains from diversifying everything else. And if you are harvesting a loss while grants are still vesting, watch the calendar, because a scheduled vest inside the 61-day window washes the loss and defers exactly the deduction you were trying to capture.