First, the tax that doesn't change
Whichever method you use, the tax at exercise is the same. The spread, meaning the market value of the shares at exercise minus the exercise price, is ordinary income. For employees it is reported on your W-2 and is subject to Social Security and Medicare tax as well as income tax. Your cost basis in any shares you keep becomes their market value on the exercise date, and later gains or losses are capital.
Employers withhold on that income, often at a flat supplemental rate that may be lower than your actual bracket. The gap can show up as a balance due in April. Our post on RSU tax withholding explains the same problem for RSUs.
What the method changes is everything else: the cash you put in, the shares you hold afterward, and your exposure from that point on.
The five methods
1. Cash exercise
You pay the exercise price and the tax withholding from your own cash and keep every share. This maximizes the shares you own, which also maximizes your concentration in one stock. It makes sense when you have cash available and a deliberate reason to hold more of the company.
2. Cashless exercise (same-day sale)
Your broker exercises the options and immediately sells all of the shares. The proceeds cover the exercise price and withholding, and you receive the rest in cash. No cash is needed up front and your exposure to the stock does not increase. Because the sale happens at about the exercise value, there is usually little additional gain or loss beyond the ordinary income.
3. Sell-to-cover
The broker sells only enough shares to pay the exercise price and withholding. You keep the remaining shares. This is a middle path: no cash out of pocket, but you add to your position. Remember that withholding may not cover the full tax, so the amount sold may be too small to cover what you will actually owe.
4. Stock swap
If your plan allows it, you pay the exercise price by delivering shares of company stock you already own, sometimes by attestation rather than physical transfer. This lets you exercise without cash and without selling shares on the market. The tax treatment of the surrendered and new shares, including how basis and holding periods carry over, is technical. Have your CPA review it before you use this method.
5. Net exercise
Some plans let the company withhold shares that would otherwise be issued, to cover the exercise price and taxes. You receive the net shares. It works like sell-to-cover without a market sale, but it is available only if your plan provides for it.
How to choose
Four questions usually decide it:
- How concentrated are you already? If company stock is already a large share of your net worth, cashless exercise avoids adding to it.
- Do you have the cash, and is this the right use of it? A cash exercise can tie up savings that other goals need.
- Can you trade? Blackout windows, insider trading policies, and, for affiliates, Rule 144 may limit when and how shares can be sold. Insiders often schedule exercises and sales under a 10b5-1 plan.
- What is the tax picture this year? The ordinary income lands in the year of exercise regardless of method. Spreading exercises across years can matter more than the method.
Hypothetical example: Meet "Marcus," a vice president at a public company whose stock is already a large share of his net worth. He has one NQSO grant nearing expiration. Holding more shares would deepen his concentration, so a cashless exercise lets him capture the value and diversify in one step. A colleague with the same grant but little company stock might reasonably choose sell-to-cover instead.
Don't let options expire unexercised
NQSOs typically expire ten years after grant, and sooner after you leave the company. Options that are in the money on their expiration date are lost if no one exercises them. Some plans and brokers offer an automatic exercise feature at expiration and some do not. Know which applies to you, and put every expiration date on a calendar.
Keep the records your CPA will need
After a sale, the 1099-B from your broker often shows a cost basis that leaves out the income already taxed on your W-2. If that number is used as-is, the same income can be taxed twice. Keep the supplemental statement from your stock plan administrator. Our post on what to give your CPA covers the fix.
Common mistakes
- Choosing sell-to-cover by default and adding to an already concentrated position.
- Assuming the withholding on exercise covers the full tax bill.
- Missing an expiration date.
- Using a stock swap without understanding its basis and holding-period rules.
- Reporting the 1099-B basis without adjusting it for income already on the W-2.
Important: Skyview Financial Group does not provide legal advice or prepare tax returns. Available exercise methods depend on your plan and your broker. We coordinate the planning with your CPA and, where needed, your company's counsel.
Related: our equity compensation planning and our guide to diversifying a concentrated stock position.
Disclosure: Skyview Financial Group, LLC is an SEC-registered investment adviser (CRD #310581). This content is educational only and is not individualized tax, legal, or investment advice. Skyview Financial Group does not prepare or file tax returns. Figures and rules cited are current as of October 2026 and subject to change; please consult your CPA and, where applicable, legal counsel. Examples are hypothetical and do not reflect any specific client.