RSU Sell-to-Cover vs. Net Settlement: How RSU Tax Withholding Actually Works

Sell-to-cover and net settlement are the two common ways employers satisfy the tax bill created when your RSUs vest. Sell-to-cover has your broker sell a slice of the newly vested shares on the open market and remit the cash; net settlement has the company simply hold back shares instead of delivering them, with no market sale. Both usually leave you with roughly the same number of net shares, but the paperwork, and sometimes the tax outcome, differ. If your offer letter lists an RSU grant with a headline share count, that number is not what lands in your account on vest day — taxes come out first, automatically, before you see a single share.

Why RSU Vesting Creates an Immediate Tax Bill

RSUs are taxed as ordinary income on the day they vest, based on that day's fair market value, not your grant-date price and not what you eventually sell for. There's no deferring this: the IRS treats a vested RSU as wages the moment it converts to stock you control.

The Employer Is Required to Withhold

Because that income is wages, your employer must withhold federal, state (where applicable), and FICA taxes at vest, the same way taxes come out of a paycheck. Something has to be withheld before you take possession of the shares, and that's where sell-to-cover and net settlement come in as the two dominant mechanisms.

Every Vesting Date Is a Separate Event

If your grant vests quarterly, each date triggers its own withholding calculation based on that day's share price. A grant that looked like one number can turn into a dozen or more separate tax events over four years.

Sell-to-Cover: How It Works

Sell-to-cover means your stock plan administrator sells a portion of the shares vesting that day, on the open market, and uses the proceeds to pay your withholding taxes. You keep the rest. It's the most common of the three main approaches (the others being net settlement and a full same-day sale), largely because it doesn't require the company to spend its own cash.

A Worked Example

Say 1,000 shares vest at $100 each, a $100,000 event. If your combined withholding rate (federal, state, FICA) comes to roughly 39%, the broker sells about 390 shares to cover that liability and deposits the remaining 610 into your account, in the same transaction.

It Shows Up as a Sale on Your 1099-B

Because actual shares were sold on the market, that transaction gets reported on your 1099-B, the same form used for any stock sale. You'll see a sale for the withheld shares even though you never chose to sell anything; the cost basis is typically the vest-date value, so it usually nets to little or no additional gain or loss.

Net Settlement: How It Works

Net settlement, also called net share withholding, skips the open-market sale entirely. The company withholds the shares needed to cover the tax bill and never issues them to you, then funds the actual cash payment to the IRS out of its own corporate cash instead of a stock sale.

A Worked Example

Using the same 1,000-share vest at $100, net settlement produces roughly the same end result, about 610 shares landing in your account, but without a corresponding sale transaction, since the company's own cash covers the withholding instead.

Why Companies Choose One Method Over the Other

Net settlement avoids pushing a wave of sell orders into the market when a large batch of employees vests on the same date, at the cost of drawing down company cash. Sell-to-cover conserves that cash but creates visible selling pressure around common vest dates, and for insiders subject to Section 16 reporting at public companies, a mandatory sell-to-cover can raise its own compliance questions since it functions like an automatic sale decision.

Sell-to-Cover vs. Net Settlement: What Actually Differs for You

For most employees, the two methods land you in roughly the same place: fewer shares than your original grant, with the gap covering withholding. The real differences show up around the edges.

Same Net Shares, Different Paper Trail

Sell-to-cover generates a 1099-B entry for the shares sold to cover taxes; net settlement generally doesn't, since no market sale occurred. If a 1099-B ever seems to double-count a vesting event, this is usually why, so keep your own vest confirmations alongside the brokerage tax forms to reconcile them at filing time.

You Usually Don't Get to Choose

Which method applies to you is set by your company's equity plan, not something you typically select per vest. Some plans do offer employees a choice, most commonly between sell-to-cover and paying the withholding out of pocket to keep every share, but that option isn't universal. Check your plan document rather than assume.

Why the Default Withholding Rate Often Isn't Enough

The federal government requires a flat 22% supplemental wage withholding rate on RSU income for most employees, a rate set under the 2017 tax law. That rate is a withholding shortcut, not your actual tax rate, and for many people in RSU-heavy tech and finance roles, it under-withholds significantly.

The Gap Between 22% and Your Real Bracket

If your combined income, salary plus vested RSU value, puts you in the 24%, 32%, or higher federal bracket, the flat 22% withheld at vest covers less than what you'll actually owe, and the gap doesn't show up until you file. Above $1 million in supplemental wages from a single employer in a calendar year, the mandatory rate jumps to 37% instead, a threshold that mainly affects large single-year events like a refresh grant or an IPO settlement.

What to Do About the Shortfall

If you expect to be under-withheld, the two practical fixes are adjusting your W-4 or making an estimated quarterly payment. Neither happens automatically, and this is general information, not tax advice; your liability depends on your full return, state, and filing status, so confirm your own numbers with a tax professional.

What to Check Before You Accept an Offer With RSUs

The RSU line in an offer letter rarely mentions withholding mechanics, but a few questions upfront avoid surprises once shares start vesting.

Ask Which Method the Plan Uses

Ask your recruiter or HR contact whether the company uses sell-to-cover or net settlement, and whether you'll have any choice in the matter. Not every company can answer this during the offer stage, but it's a reasonable question before your first vest.

Model Your Real Take-Home, Not the Grant Headline

A grant described as "$200,000 over four years" is a gross number, before withholding at each vest and before your actual tax rate. Running your own numbers, rather than treating the headline figure as take-home pay, gives you a realistic picture when comparing two job offers that weight cash and equity differently.

Understand How This Interacts With Your Vesting Schedule

The mechanics above assume shares are already vesting. If you're still working out when your equity actually starts converting to owned shares, our guides to RSU vesting and the vesting cliff cover that groundwork first. Offer XRay can also flag when an offer letter's equity section is vague about vesting structure before you get to the tax questions at all.

Frequently Asked Questions

Do I get to choose between sell-to-cover and net settlement?

Usually not. The method is set by your equity plan, though some plans let employees elect to pay withholding out of pocket to keep every vesting share. Check your plan document rather than assume a choice exists.

Why does my 1099-B show a sale I didn't make?

If your plan uses sell-to-cover, the shares sold to satisfy withholding appear as an ordinary stock sale on your 1099-B, even though you didn't initiate it. The cost basis is typically the vest-date value, so it usually produces little additional gain or loss, but check it against your vest confirmation.

Is 22% withholding enough to cover my RSU taxes?

Not necessarily. The 22% federal supplemental wage rate is a flat withholding shortcut, and if your total income puts you above the 22% bracket, you'll likely owe more at filing. Above $1 million in a calendar year from one employer, the mandatory rate rises to 37%.

Does net settlement cost the company more than sell-to-cover?

Net settlement funds the tax payment from company cash instead of selling shares, so it draws down corporate cash in a way sell-to-cover doesn't. That's one reason some companies prefer sell-to-cover, particularly when large numbers of employees vest on the same date.

Key Takeaways

• RSUs are taxed as ordinary income on the vest date, and your employer must withhold taxes before shares reach your account.
• Sell-to-cover sells vested shares on the open market to raise cash for withholding; net settlement withholds shares directly and pays the tax from company cash. Both leave a similar net share count, but only sell-to-cover shows up as a sale on your 1099-B.
• The default 22% federal withholding rate often falls short if your income lands in a higher bracket, and it jumps to 37% above $1 million in supplemental wages from one employer in a year.
• Ask which method your plan uses before treating an offer's headline equity number as take-home value, and model the real after-tax math instead.

The share count in an RSU offer is the easy part to read; what happens to those shares at each vesting date is where the real math lives. If you want a second set of eyes on an offer's equity section before you sign, Offer XRay checks for vague or missing vesting and withholding language automatically.