Does sell to cover mean the tax is handled?
No. Sell to cover answers the question how do we pay the withholding without asking you for a check. It sells enough of the newly vested shares to fund what the employer remits. Whether that amount matches your actual tax is a different question and the vest notice does not answer it. On a $90,000 vest for a married couple filing jointly with $361,500 of salary, $19,800 is remitted federally against $22,860 of federal tax, so $3,060 is still outstanding. Educational only.
What sell to cover does
Your vest creates a tax obligation that the employer has to remit immediately. Rather than invoice you, the plan administrator sells a portion of the shares, or holds some back, and sends the proceeds in as withholding. You keep the rest.
Sell to cover is a way to fund the withholding, and it works fine.
What it answers: how the withholding gets paid.
What it does not answer: whether the withholding was enough.
Why the amount can fall short
The withholding is computed by a method, and the common method uses the flat supplemental rate of 22%. That method does not take your household into account: your spouse's income, your other wages this year, or which bracket your last dollar falls in. On this sample the top of the vest reaches 32%.
So the vest is withheld at 22% while it is taxed at an effective 25.4%. That difference, in dollars, is the withholding gap.
It can also run the other way. Below roughly $155,000 of household income for a married couple with a vest this size, the flat rate covers the federal tax on the vest entirely, and a shortfall does not appear.
How to read your vest notice
The notice or advice document usually shows the shares vested, a fair market value, the shares sold or withheld, and a set of tax lines. Check three things.
- Find the fair market value used. That figure is the ordinary income now on your W-2, and it is your cost basis for the shares you kept.
- Separate federal income tax from the rest. Social Security, Medicare and state lines are real money but they do not change the federal income tax calculation.
- Divide federal income tax withheld by the fair market value. If it comes to about 22%, the flat method was used, and the comparison on this site applies directly.
How large the difference gets
Same vest, two households.
| Household | Federal withheld | Federal tax on the vest | Federal outstanding |
|---|---|---|---|
| Married jointly, $361,500 salary | $19,800 | $22,860 | $3,060 |
| Married jointly, $950,000 salary | $19,800 | $33,300 | $13,500 |
Withholding is the same in both rows because payroll uses the same flat rate. Only the tax owed changes.
Questions people ask
Is sell to cover the same as net settlement?
The result is the same. The mechanics differ slightly. Sell to cover sells shares on the market to raise cash for the withholding; net settlement has the company retain shares and remit the cash itself. Either way you receive fewer shares than vested and the withholding is funded.
Can I choose not to sell to cover?
Some plans allow paying the withholding in cash instead, keeping all the shares. Whether that option exists is set by your plan, and it changes how the withholding is funded rather than how much tax you owe.
Does selling to cover create a capital gain?
Almost never a meaningful one. The shares are sold at or very near the vest-day value that became their basis, so the gain or loss is close to zero.
Why did my company withhold more than 22%?
Several possibilities: your supplemental wages from that employer passed $1 million for the year, which puts the portion above $1 million at 37%; the employer aggregated the vest with regular wages instead of using the flat method; or the additional amount is state tax, Social Security and Medicare rather than federal income tax. Your stub separates them.
Try it with your own numbers
Compare what was withheld on your vest against what the vest adds in tax.
Free to use, and your figures stay in your browser.
Sell to cover pays the withholding at a flat rate. What's left, and when it's due, is worth a fifteen-minute call.