Employee stock options can be a powerful wealth-building tool, but exercising them efficiently — particularly from a tax and cash flow standpoint — requires careful planning.
Many companies offer equity awards to highly compensated employees in the form of non-qualified stock options (NSOs) and incentive stock options (ISOs). These require the employee to purchase the shares at a stated price, known as the option exercise price, to acquire the stock. While you may purchase the shares with cash, this may not be feasible if you prefer to maintain your current liquidity.
A common solution is a cashless exercise, where you temporarily borrow money to exercise the options and immediately sell the stock to cover the loan. This may be an effective means to exercise shares when you don’t have personal liquidity, but it can create adverse tax consequences.
One advanced strategy is using stock swaps (also called pyramiding), which allows you to use stock rather than cash to exercise the employee stock options. While attractive in the right circumstances, this approach also introduces complex tax and basis considerations.
How a stock swap works
A stock swap occurs when you use already-owned company shares to pay the exercise price to acquire new shares. As the name implies, the old shares are traded for replacement shares, and since you would generally not exercise an option when the current price is less than the exercise price, you may obtain additional new shares. You can repeat this process for acquiring new shares, which is where the term “pyramiding” comes from.
The tax implications of stock swaps
The tax treatment depends on several factors that can become complicated; this article focuses on the high-level aspects. We look at exercising NSOs and ISOs from existing shares that were either acquired from a previous NSO exercise or restricted stock grant or bought outright in the market.
Using a stock swap to exercise NSOs
When exercising an NSO, the bargain element (the difference between the fair market value of the stock and the exercise price) is included on your W-2 and taxed as ordinary income.1 This does not change with a stock swap strategy.
However, the built-in gain from the shares used in the swap is not taxed immediately. Instead, you might see a carryover basis from the old shares to the replacement shares, and the holding period also carries over. The new shares may have a basis equal to the amount included in your W-2, and the holding period begins on the date of exercise.
Example 1:
- Andrew owns 100 shares of XYZ, Inc. with a cost basis of $40 per share ($4,000 total).
- He has 150 shares he can exercise through an NSO grant from his employer at $45 per share.
- We’ll assume the current value of XYZ, Inc. stock is $75.
What are Andrew’s tax consequences this year, what is his basis, and what is the holding period?
- When he exercises the options, Andrew will recognize $30 ($75 – $45) per share as ordinary income. Multiplying that by 150 shares is $4,500.
- The cost to exercise is the grant price of $45 per share * 150 shares, which is $6,750.
- Using a stock swap, he can use 90 shares ($6,750 / $75). Therefore, 90 of the 150 option shares are “replacement shares,” and they carry over the basis they originally had of $40. These shares will have a holding period that includes the holding period of the original shares.
- The remaining 60 “new shares” (150 – 90) will have a basis of $4,500, which works out to $75 per share. The holding period for these begins on the date of exercise.
In conclusion, Andrew will hold 10 shares from the original 100 with a $40 per share basis. He will also hold 90 replacement shares with a basis of $40 per share. Lastly, he will hold 60 additional shares with a basis of $75 per share.
The potential benefit, in this example, is that Andrew can exercise the options without selling his original 90 shares and without recognizing $3,150 in capital gains [($75 – $40) * 90]. A similar net result could be achieved with a cashless exercise of 90 shares.
| Shares | Value per share | Total value | Basis per share | Total basis | Built-in gain | Income | ||
|---|---|---|---|---|---|---|---|---|
| Original shares | 100 | $75 | $7,500 | $40 | $4,000 | $3,500 | $0 | |
| Stock swap | -90 | $75 | -$6,750 | NA | NA | NA | $0 | |
| Replacement shares | 90 | $75 | $6,750 | $40 | $3,600 | $3,150 | $0 | |
| New shares | 60 | $75 | $4,500 | $0 | $0 | $4,500 | $0 | |
| Remaining original shares | 10 | $75 | $750 | $40 | $400 | $350 | $0 |
Stock swaps and ISOs: AMT considerations
ISOs receive preferential treatment under the tax code but also come with a list of requirements. One of those requirements is a holding period: either two years from grant or one year from exercise — whichever is longer. Most option grants come with a vesting schedule of several years, so the main hurdle is holding the stock for more than one year after exercising the option to avoid a disqualifying disposition.
The results of a stock swap in this situation may be even more advantageous than with the NSO. When the ISO is exercised, there is no ordinary income; however, the spread may trigger alternative minimum tax (AMT).2 The replacement shares may carry over the basis from before the exercise, and the holding period for capital gains is carried over, thus the shares must be held for more than one year to avoid the disqualifying disposition treatment. The new shares may have a $0 basis and a holding period that starts at the date of exercise.
Example 2:
Using the same data as Example 1 except the options are ISO instead of NSO.
- When Andrew exercises the options, he will recognize $4,500 of AMT income. Whether this increases his actual tax liability depends on other tax factors specific to his tax return. Even if it does cause AMT, the maximum AMT rate is 28% versus the maximum ordinary rate of 37%.
- Using a stock swap, he will need to use 90 shares. Therefore, 90 of the 150 shares will be “replacement shares” and will carryover the basis they originally had of $40. These shares will have a holding period that includes the holding period of the original shares (however the 1-year holding period is still required for qualifying treatment).
- The remaining 60 “new shares” will have a basis of $0 since he did not recognize any income for regular tax purposes. He may have a separate AMT basis if he paid AMT on the exercise. The holding period for these begins on the date of exercise.
In conclusion, Andrew will hold 10 shares from the original 100 with a $40 per share basis. He will also hold 90 replacement shares with a basis of $40 per share. Lastly, he will hold 60 additional shares with a basis of $0 per share.
Like the NSO exercise, Andrew will not need to sell the 90 shares to make this exercise, saving him $3,150 in capital gains recognition. However, unlike the NSO, a cashless exercise of 90 shares would be worse since those 90 shares would be a disqualifying disposition and result in W-2 ordinary income recognition of $2,700 [($75-$45)*90].
| Shares | Value per share | Total value | Basis per share | Total basis | Built-in gain | Income | ||
|---|---|---|---|---|---|---|---|---|
| Original shares | 100 | $75 | $7,500 | $40 | $4,000 | $3,500 | $0 | |
| Stock swap | -90 | $75 | -$6,750 | NA | NA | NA | $0 | |
| Replacement shares | 90 | $75 | $6,750 | $40 | $3,600 | $3,150 | $0 | |
| New shares | 60 | $75 | $4,500 | $0 | $0 | $4,500 | $0 | |
| Remaining original shares | 10 | $75 | $750 | $40 | $400 | $350 | $0 |
Key benefits and risks of stock swaps
Like with many financial strategies, stock swaps have trade-offs.
Potential advantages include:
- Conserving cash.
- Deferring taxes on selling current shares.
- Leveraging existing equity.
- Compounding ownership without incremental capital.
Potential disadvantages include:
- Complex tax tracking to ensure taxable amounts are properly reported, multiple basis layers are tracked, and holding periods are accounted for.
- Concentration risk of employer securities.
Is a stock swap right for you?
Not every company’s equity compensation plan allows stock swapping, but it can be an important strategy when it is available. You might consider this arrangement if you have a high conviction in your company’s stock, limited liquidity to exercise shares, and plenty of investment diversification outside of these holdings.
Stock swaps represent a sophisticated approach to exercising employee stock options, blending cash-flow efficiency with tax planning. However, the strategy is not universally beneficial and introduces meaningful complexity — particularly in AMT exposure and basis tracking.
This strategy should be implemented only as part of a comprehensive financial plan, ideally in coordination with tax professionals. When used appropriately, a stock swap seeks to accelerate equity ownership and optimize long-term outcomes.
Mercer Advisors can help you evaluate whether the stock swap strategy aligns with your overall financial goals.
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A stock swap, also known as pyramiding, is a strategy where you use already-owned company shares to pay the exercise price for new employee stock options. Instead of using cash, you trade your existing shares for replacement shares, potentially acquiring additional new shares in the process. This approach can be repeated over time to build equity.
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When you exercise an NSO using a stock swap, the bargain element (the difference between the fair market value and the exercise price) is still taxed as ordinary income. However, the built-in gain from the shares used in the swap is not taxed immediately. The replacement shares carry over their original basis and holding period, while the new shares have a basis equal to the amount included in your W-2.
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A stock swap may be beneficial if you want to conserve cash, defer capital gains taxes on existing shares, and leverage your current equity. However, it introduces complex tax tracking and increases your concentration risk in employer securities. You should evaluate this strategy as part of a comprehensive financial plan and consult with a tax professional to determine if it aligns with your goals.
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The right choice depends on your specific financial situation. A cashless exercise is simpler but may trigger immediate capital gains or ordinary income taxes, especially with incentive stock options (ISOs), which can cause a disqualifying disposition. A stock swap may offer better tax deferral but requires meticulous tracking of basis layers and holding periods.
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You can determine if your company permits stock swaps by reviewing your employer’s equity compensation plan documents or your specific stock option grant agreement. You may also contact your human resources or benefits department for clarification on the approved methods for exercising your options.
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An experienced wealth advisor or tax professional can help you navigate the complexities of equity compensation. Mercer Advisors offers comprehensive financial planning services that coordinate your investment management, tax planning, and estate planning needs. Contact us to arrange a consultation and discuss your specific situation.
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The primary difference lies in the tax treatment. Exercising NSOs triggers ordinary income tax on the bargain element, regardless of the exercise method. Exercising ISOs generally does not trigger ordinary income tax, but the spread may expose you to the alternative minimum tax (AMT). Additionally, ISOs have strict holding period requirements to maintain their preferential tax status.
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Paying cash to exercise options is straightforward and establishes a clear cost basis for all acquired shares, but it requires significant liquidity. A stock swap conserves your cash by using existing shares, but it complicates your tax situation by creating multiple layers of cost basis and holding periods for the replacement and new shares.
1,2.“Topic No. 427, Stock Options.” Internal Revenue Service, 2026.
All expressions of opinion reflect the judgment of the author as of the date of publication and are subject to change. Some of the research and ratings shown in this presentation come from third parties that are not affiliated with Mercer Advisors. The information is believed to be accurate but is not guaranteed or warranted by Mercer Advisors. Content, research, tools and stock or option symbols are for educational and illustrative purposes only and do not imply a recommendation or solicitation to buy or sell a particular security or to engage in any particular investment strategy. Hypothetical examples are for illustrative purposes only.
Mercer Advisors is not a law firm and does not provide legal advice to clients. All Estate planning document preparation and other legal advice are provided through select third parties, with which Mercer Advisors has a contractual relationship. Tax preparation and tax filing are a separate fee from our investment management and planning services.
