Cashless NSO Exercise: How Your Broker Settles It

A principal at a public tech company logged into the Fidelity stock plan portal to exercise 5,000 NSOs. Strike $12, market price $94. The portal presented three options: cash exercise (write a check for $60,000 and receive 5,000 shares), cashless exercise and sell (sell enough shares to cover strike + taxes, keep the rest), or cashless exercise and sell all. He picked cashless exercise and sell. The portal pre-calculated the outcome: approximate gross proceeds $410,000, strike $60,000, estimated tax withholding $153,000, net cash $197,000, net shares 0.

He clicked execute at 9:42 AM. At 9:44 AM the portal confirmed: actual proceeds $410,000 at $94.00 exactly (the opening price was quiet), withholding $153,120, net cash $196,880. The money was in his bank account within three business days. The W-2 at year-end showed $410,000 of additional compensation.

Cashless exercise is the default for NSO transactions at most public companies. The mechanics are standardized across the major brokers (Fidelity, Morgan Stanley, Charles Schwab/Equity Edge, Bank of America). The variations between the three cashless paths determine how many shares end up in the employee’s account versus converted to cash.

The three cashless paths

Cashless exercise and sell-to-cover

The broker exercises the option, sells exactly enough shares to cover the strike price plus required withholding, and delivers the remaining shares to the employee.

For a 5,000-share exercise at $12 strike and $94 FMV:

Gross value: 5,000 × $94 = $470,000
Strike owed: $60,000
Spread: $410,000 (this is compensation)
Withholding: ~37% combined federal + state + Medicare = ~$150,000
Cash needed from sales: $60,000 (strike) + $150,000 (withholding) = $210,000
Shares sold: $210,000 / $94 = 2,235 shares
Shares delivered: 5,000 - 2,235 = 2,765 shares
Cash to employee: $0 (beyond fractional)

The employee receives 2,765 shares valued at $259,910 at the market price, fully paid tax on the full spread.

Cashless exercise and sell all

The broker exercises the option, sells all 5,000 shares, pays the strike from proceeds, withholds tax, and delivers the remaining cash to the employee.

Gross proceeds: 5,000 × $94 = $470,000
Strike paid: $60,000
Withholding: $150,000
Cash to employee: $470,000 - $60,000 - $150,000 = $260,000

No shares remain. The employee has $260,000 of cash and no employer-stock position.

Cash exercise (not cashless)

The employee writes a check for the strike to the company and receives all 5,000 shares. The company processes the spread through payroll with withholding deducted from other wages (or sometimes from the exercise itself via sell-to-cover on delivered shares). The employee keeps all 5,000 shares.

Cash exercise requires cash-at-hand for both the strike and the withholding. For a $60,000 strike and $150,000 withholding on this example, that is $210,000 out of pocket (minus any withholding taken from other wages).

Which path to choose

Sell all produces cash, no shares

Choose sell-all when the goal is to exit the position entirely. Reasons include:

Concentration is already high and more employer stock is unwelcome.
The options are near expiration and exercising is forced.
Market conditions are attractive for liquidation.
The employee is leaving the company.

Sell-all is the cleanest option for employees who have no reason to hold additional employer stock.

Sell-to-cover preserves shares

Choose sell-to-cover when the goal is to acquire the shares without cash out of pocket. Reasons include:

The employee wants long-term capital gain treatment on post-exercise appreciation.
The employee believes the stock will rise further.
The employee wants to use the shares for charitable giving or other non-sale purposes.

Sell-to-cover uses the exercise itself to fund the acquisition cost, leaving shares in the account.

Cash exercise preserves maximum shares

Choose cash exercise when:

The employee has liquid cash and wants to preserve every share.
The strike is low relative to FMV, making the cash cost small relative to the share value.
The employee is concerned about blackout restrictions on the sell-to-cover shares.

Cash exercise requires the most cash but delivers the most shares.

The broker’s execution details

Market-order execution

Cashless exercises typically use market orders at the time of exercise. The broker does not wait for a better price; it executes at the prevailing market. On volatile days, the execution price can be several percent away from the pre-confirmation quote.

For a sell-to-cover exercise that assumes $94 per share but actually executes at $91, the broker must sell more shares to raise the same cash. The delivered share count decreases. The W-2 spread might also be slightly different because the exercise-date FMV reference changes the compensation calculation.

Limit-order cashless

Some brokers allow limit-order cashless exercises. The exercise executes only if the market price meets a minimum threshold. This adds control over execution price at the cost of potentially missing the exercise if the market stays below the limit.

Limit orders on cashless exercises are common for employees with large exercises who want to control the sale price. A $5 million exercise at a market price that fluctuates between $85 and $95 can benefit from limit-order precision.

Commission and fees

Broker fees on cashless exercises vary. Fidelity’s Net Benefits platform typically absorbs commissions on same-day exercise transactions. Other brokers charge per-share fees (around $0.02-$0.05 per share) that the employee pays out of proceeds.

For large exercises, commission cost can be a few hundred dollars. It is disclosed in the confirmation but rarely material relative to the total transaction value.

The tax reporting

W-2 reporting

The full spread is ordinary compensation. It flows to Box 1 of the W-2 as wages. A subset is also reported in Box 14 labeled “NSO” for the employee’s reference.

Withholding flows to Box 2 (federal), Box 4 (Social Security if applicable), Box 6 (Medicare), and the corresponding state boxes.

1099-B reporting

The share sale portion of the cashless exercise appears on a 1099-B from the broker. For sell-all transactions, all 5,000 shares are reported. For sell-to-cover, only the covered shares (2,235 in the example) are reported.

The 1099-B cost basis may or may not include the spread. If the reported basis is just the strike ($12), the 1099-B shows a gain of $82 per share ($94 sale minus $12 basis) on the cover shares. That gain was already taxed as compensation on the W-2. Form 8949 adjustment code B corrects the basis to $94 per share (strike + spread), producing a correct near-zero gain on the cover shares.

This basis correction is the single most common equity-comp tax reporting error. Employees who do not adjust the 1099-B pay ordinary tax on the spread (via W-2) and capital gains tax on the same spread (via uncorrected Schedule D).

The Morgan Stanley, Schwab, and Fidelity variations

Morgan Stanley StockPlan Connect

Morgan Stanley typically defaults to sell-to-cover for NSO exercises. The employee can toggle to sell-all in the exercise flow. Withholding is calculated at the supplemental rate (22% federal plus applicable state).

Fidelity NetBenefits

Fidelity allows all three paths. The confirmation screen shows a detailed breakdown of gross proceeds, strike, withholding, and net deliverables. Fidelity’s commission absorption makes it slightly more economical than other brokers for large exercises.

Charles Schwab / Equity Edge

Schwab provides similar functionality. The user interface is sometimes more clinical, with less hand-holding on the tax implications.

Bank of America / Merrill Lynch

Primarily used for large-cap public companies with long-standing BofA relationships. Functionality is comparable to the other majors.

The 10b5-1 plan cashless exercise

A 10b5-1 plan can specify cashless exercises. The plan language might say “exercise and sell 5,000 NSOs on March 15, 2026 at market.” The broker executes the transaction on the specified date regardless of whether the company is in a blackout.

For an employee who wants cashless exercises on a schedule, a 10b5-1 plan provides execution certainty. The SEC’s 2023 amendments on 10b5-1 plans apply: cooling-off period, single-plan limit for insiders, and certification requirements.

Frequently asked

Why is my cashless confirmation price different from the Yahoo Finance price?

The broker executes at the bid or the midpoint, not at the last trade price. A bid-offer spread of $0.10 on a $94 stock is typical.

What happens if the market is closed when I click exercise?

The exercise queues for the next trading day’s open. Prices can move overnight, so the confirmation price is an estimate.

Can I cancel a cashless exercise?

Typically only before the broker executes. Once executed, the transaction is final.

No. Social Security applies only up to the wage base ($168,600 for 2025). Once your cumulative W-2 wages exceed the base, no additional Social Security applies.

What if I want to exercise and keep shares but not pay withholding from salary?

Sell-to-cover funds the withholding from the exercise itself. Cash exercise requires writing a check for strike plus withholding. Most employees who want shares choose sell-to-cover.

Before your next exercise, model the three paths in the NSO/ISO comparison calculator.