Managing Capital Gains When Selling Concentrated Stock

Why Concentrated Stock Positions Require a Different Approach

A diversified investor selling a small position in a declining year faces a manageable tax decision. An investor holding a large concentrated position in a single stock faces something categorically different: a tax problem that may be larger than the investment decision itself.

Concentrated positions accumulate in predictable ways. An executive receives RSUs or stock options over a 10-year career and most of the vested shares are still held. A founder took a company public and still holds a significant share of the company. An employee at a large technology company bought shares through a purchase plan over decades at prices far below today’s market value. In each case, the position has appreciated substantially and the embedded gain is large relative to the investor’s overall net worth.

The tax problem has three dimensions that standard investment advice does not address. First, the gain is real and has to be recognized at some point unless the shares are held until death or donated to charity. Second, the concentration itself creates risk that is separate from the tax question: a large single-stock position that declines significantly may take years to recover, and the tax cost of diversifying does not disappear just because the stock went down. Third, the timing of the sale interacts with other income sources in ways that can dramatically affect the effective tax rate on the gain.

Reducing capital gains on concentrated stock requires addressing all three dimensions, not just minimizing the tax bill on a single transaction. The strategies below apply across stock types including RSUs, employer stock, founder shares, and long-held appreciated positions.

What Are the Core Strategies for Reducing Capital Gains on Concentrated Stock?

Staged Selling Across Multiple Tax Years

The most direct approach is selling the position over multiple years rather than all at once. Spreading the realized gain across several tax years keeps annual income lower, which may keep the gain in the 15% or 20% long-term capital gains bracket rather than triggering the 3.8% Net Investment Income Tax surcharge or pushing other income into higher brackets through the interaction of stacked income sources.

Staged selling also allows for coordination with other income events. If a large bonus is expected in year two, concentrating more of the sale in years one and three reduces the combined income in the high-income year. If retirement is approaching and income will drop, deferring a portion of the sale to lower-income years may reduce the blended rate across the entire liquidation.

The tradeoff is continued concentration risk. Selling slowly while holding a large single-stock position means continued exposure to the risk that the stock declines, potentially eliminating gains that would otherwise have been available. This is not a theoretical risk. Many executives and employees who held large concentrations in individual companies have experienced significant declines. The tax savings from a gradual sale strategy may not justify the retained risk in every case, and that tradeoff is specific to each investor’s situation.

Tax-Loss Harvesting to Offset the Gain

If the portfolio contains other positions with unrealized losses, harvesting those losses in the same year as the concentrated stock sale can offset a portion of the realized gain. Capital losses offset capital gains of the same type first: short-term losses against short-term gains, long-term losses against long-term gains. Net losses in excess of gains can offset up to $3,000 of ordinary income annually, with the remainder carrying forward.

For a concentrated position generating a large long-term gain, the question is whether the rest of the portfolio contains enough loss positions to make a meaningful dent. In years when markets have risen broadly, loss positions may be scarce. In years following a correction, loss harvesting opportunities may be significant. A fiduciary advisor managing individual securities rather than funds has the ability to identify and execute harvesting throughout the year, not just at year-end.

Loss harvesting does not eliminate the gain. It reduces the net taxable gain for the year. For very large concentrated positions, loss harvesting is a supplementary strategy, not the primary one. Its value depends entirely on what loss inventory exists in the broader portfolio. The tax-loss harvesting guide covers the mechanics and the wash sale rule in detail.

Donating Appreciated Shares Directly to Charity

For investors with charitable intent, donating appreciated shares directly to a qualifying charity is one of the most tax-efficient strategies available for concentrated stock. When you donate shares that have been held more than one year, you receive a deduction for the full fair market value of the shares and pay no capital gains tax on the appreciation. The charity, as a tax-exempt entity, also pays no tax when it sells the shares.

The economic benefit compared to selling first and donating cash is significant. Selling a $100,000 position with a $20,000 cost basis generates an $80,000 long-term gain. At a combined 23.8% federal rate, the tax cost is approximately $19,040. Donating the shares directly to charity avoids that entire tax cost and still produces a $100,000 deduction, subject to AGI limitations.

A Donor-Advised Fund provides additional flexibility. Contributing appreciated shares to a DAF generates the charitable deduction in the year of contribution, but grants can be distributed to qualifying charities over time. For investors who want to give consistently over many years but have a single year when a large concentrated stock sale is generating significant income, front-loading a DAF contribution with appreciated shares in the high-income year may produce a deduction that offsets a meaningful portion of the capital gain.

A Charitable Remainder Trust is a more complex structure that allows an investor to contribute appreciated shares, receive an income stream for a defined period, and pass the remaining assets to charity at the end. The CRT sells the shares without immediate capital gains taxation, reinvests the full proceeds, and distributes income to the donor over time. The income distributions are partially taxable depending on the character of the trust’s earnings, but the structure defers and in some cases permanently eliminates a portion of the capital gain. CRTs require setup and ongoing administration costs that are worth comparing against the tax benefit for any specific position size.

Timing the Sale to Coincide with Low-Income Years

The federal long-term capital gains rate is 0%, 15%, or 20% depending on taxable income. For high earners, the 20% rate plus the 3.8% NIIT surcharge produces a combined federal rate of 23.8%. But in years when taxable income is lower, a portion of the gain may fall into the 15% bracket, or for investors with very low income, the 0% bracket.

This creates an incentive to time concentrated stock sales around low-income years: early retirement before Social Security begins, a career gap year, the year after a business sale when other income has dropped, or the period between leaving a high-income position and starting the next one. A gain recognized in a year with $90,000 of other taxable income may face a very different effective rate than the same gain recognized in a year with $400,000 of other income.

State income tax adds another dimension. Several states tax capital gains as ordinary income at rates that exceed 9% to 13%. An investor who establishes residency in a no-income-tax state before a sale may face a substantially lower combined state and federal rate. This is a planning decision that requires lead time and genuine change of domicile, not a last-minute maneuver. The tax savings need to be weighed against the costs and personal implications of relocation, but for very large positions the numbers can be significant.

Exchange Funds

An exchange fund allows an investor to contribute appreciated shares to a partnership fund alongside other investors contributing different appreciated positions. The investor receives a proportionate interest in the diversified pool rather than cash, which defers the capital gains recognition. To qualify, the investor must generally hold the fund interest for at least seven years, and the fund must hold at least 20% of its assets in qualifying illiquid investments.

Exchange funds can be an effective tool for investors who want diversification without an immediate tax event and who have a long time horizon. The limitations are meaningful: minimum investment sizes are typically large, the fund structure adds complexity and fees, and the investor gives up direct control over the securities in the pool. Not all advisors have access to exchange fund structures, and not all concentrated positions qualify depending on the stock type and holding period. Exchange funds are worth evaluating alongside the other strategies but are not universally available or appropriate.

Holding Concentrated Stock and Planning Around It

For investors who are unable or unwilling to sell, the concentration risk can be managed through other portfolio construction decisions rather than eliminated. Writing covered calls generates income and can create partial downside protection. Protective puts provide downside insurance at a premium cost. Collars, combining a covered call and a protective put, can define a range of outcomes without triggering an immediate taxable event, though the tax treatment of collar strategies is complex and requires specific tax advice.

Pledging concentrated stock as collateral for a margin loan provides liquidity without a sale, deferring the tax event. This strategy carries meaningful risk: if the stock declines significantly, the loan may be called or the collateral requirements may increase, creating a forced sale at the worst possible time. The 2008 and 2020 market events included numerous cases of exactly this outcome. Borrowing against concentrated stock is a liquidity strategy, not a tax strategy, and the risk profile needs to be fully understood before implementation.

The Step-up in Basis at Death

For investors who hold concentrated stock with very low cost basis and do not need the proceeds during their lifetime, holding until death produces a full step-up in basis for heirs. Under current law, inherited assets receive a cost basis equal to the fair market value on the date of death. The embedded gain that accumulated over the investor’s lifetime is eliminated entirely for capital gains purposes.

This strategy only makes sense when the investor has sufficient other assets to fund retirement, does not need diversification proceeds during their lifetime, and has estate planning objectives that align with passing the concentrated position to heirs. It is not a deferral strategy. It is a permanent elimination of the gain for investors who fit that profile. Estate tax considerations interact with the step-up analysis and require a coordinated review with an estate planning attorney.

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How Do RSUs and Employee Stock Differ from Founder Shares?

The tax reduction strategies available depend partly on how the concentrated position was acquired. RSUs vest as ordinary income and carry a cost basis equal to the fair market value at vesting. The capital gain begins accruing only after vesting. For an employee holding RSUs for several years post-vest, the gain may still be large but the entire gain qualifies for long-term treatment if held more than one year from the vest date. All six strategies above may apply.

Founder shares acquired at inception, often at a nominal price, may have a very low cost basis relative to current value and may qualify for the Qualified Small Business Stock exclusion under Section 1202. The QSBS exclusion can eliminate up to $10 million or ten times the original investment in capital gains on qualifying C-corporation stock held more than five years. For founders who incorporated with QSBS-eligible stock, the exclusion may eliminate the capital gains problem entirely, making the other reduction strategies secondary. QSBS eligibility requires confirmation against specific requirements and state tax treatment of the exclusion varies.

Stock options, both ISOs and NSOs, have tax events at exercise as well as at sale. ISOs exercised and held can qualify for long-term capital gains treatment on the full spread if holding period requirements are met. NSOs create ordinary income at exercise on the spread between the exercise price and fair market value. The planning for options-based concentrated positions requires a different analysis than for outright share holdings. The capital gains planning for founders guide covers option-specific strategies in detail.

What Should the Planning Process Look Like?

Reducing capital gains on a concentrated stock position is not a single decision. It is a multi-year plan that coordinates the position size, the investor’s income picture, charitable intent, estate planning goals, and risk tolerance. The sequence matters as much as the strategies chosen.

The starting point is a full inventory: the number of shares, the cost basis by lot, the holding period by lot, and an estimate of the embedded gain at current prices. For positions with multiple lots acquired at different prices and different times, the lot-level analysis determines which shares are most tax-efficient to sell first and which strategies apply to which lots.

Next is a projection of income for the next three to five years, identifying the years where the combined rate on a capital gain would be lowest and mapping those years against any planned life events: retirement, a business sale, a deferred compensation payout, or a major liquidity need.

The charitable and estate planning objectives are evaluated against the income projection. If charitable giving is planned, the question is whether donating shares rather than cash in the high-gain years produces better outcomes than the default approach.

The result is a written plan with specific sale amounts, target years, charitable contribution amounts, and fallback strategies if income in a target year turns out to be higher than projected. Preserve. Strengthen. Grow.™ treats concentrated position management as a preservation challenge first: the objective is to protect what has been built without allowing a solvable tax problem to dictate an otherwise avoidable financial outcome.

For investors approaching a liquidity event or managing a large single-stock position, the business exit planning guide and the capital gains and tax planning guide cover the broader planning context for concentrated position management.

Frequently Asked Questions