Concentrated Stock Position: Tax Strategies for $2M–$20M Investors

Why the $2M–$20M bracket gets this problem most

Concentrated positions show up disproportionately at your wealth level. Ultra-high-net-worth investors have family offices that manage this from day one. Mass-market advisors don't have the depth for the strategies involved. You're in the middle: large enough for these strategies to matter significantly, outside the demographic most often served by specialists.

The most common scenarios:

• RSU accumulation: A decade of equity grants at a technology or pharmaceutical company vest into a single-name position that grows to represent 40–60% of net worth.
• Business sale: An all-stock acquisition deal leaves you with a $3M concentrated position in the acquiring company.
• Options windfall: NQSOs or ISOs exercised at the right time, now sitting as a low-basis holding in a taxable account.
• Inheritance with subsequent appreciation: Shares inherited with a stepped-up basis have since appreciated — the tax problem is smaller but growing, and concentration risk is real.

What diversification costs — the 2026 federal math

For a $2M–$20M household, the applicable federal rate on long-term capital gains is typically 23.8% — the 20% long-term rate plus the 3.8% Net Investment Income Tax (NIIT), both applying once income crosses the relevant thresholds:

• 20% LTCG rate: Applies when total taxable income exceeds $613,700 (MFJ, 2026).²
• 3.8% NIIT: Applies to net investment income when MAGI exceeds $250,000 (MFJ, not inflation-indexed).¹

These two rates are calculated independently but often both apply simultaneously. If your other income is $350K, most of a large gain pushes you above both thresholds — meaning nearly every dollar is taxed at the combined 23.8%. Add state income tax (California: 13.3%; New York: up to 10.9%) and a full immediate liquidation can cost 30–37 cents on the dollar.

That's the number the following strategies reduce.

Strategy 1: Phased diversification — spread the gain across tax years

The core insight: the 20% LTCG rate only kicks in above $613,700 of total taxable income (MFJ, 2026). Long-term gains below that threshold are taxed at 15%. A five-percentage-point rate difference sounds small, but on $1M of gain it's $50,000.

How to implement: Sell enough each year to keep your combined income (wages + investment income + realized gain) below $613,700. For a household with $300K of other income, that's up to $313,700 of realizable gain per year at the 15% rate. Over five years, a $1.5M gain can be unwound almost entirely at the lower rate.

The obvious tradeoff: you remain concentrated in the single stock longer. If the position falls 40% during your five-year phasing schedule, the tax savings are irrelevant. This is a real risk, not a theoretical one — the strategies below address it.

Pair with Roth conversions: If you're doing Roth conversions in the same years (see our Roth conversion guide), the two strategies compete for the same bracket space. A fee-only advisor can model the optimal sequencing.

Strategy 2: Offset with tax-loss harvesting

Capital losses offset capital gains dollar-for-dollar. If your taxable portfolio includes any positions in a loss — a sector bet that hasn't worked out, international equities in a down year — harvesting those losses directly reduces the net gain subject to tax in the same year.

At $2M+ in taxable assets, a direct-indexing separately managed account (SMA) is designed precisely for this. Instead of holding a total-market ETF, you hold the underlying stocks individually and harvest losses when individual constituents decline, even when the index is flat. On a $2M–$5M taxable equity portfolio, annual loss harvest can generate $30,000–$80,000 in losses, meaningfully offsetting the gains from a concentrated position you're unwinding.

The wash-sale rule limits substituting back into the same security within 30 days, but with hundreds of index constituents available as substitutes, the harvest can continue without disrupting market exposure. See our tax-loss harvesting and direct indexing guide for full mechanics.

Strategy 3: Donate appreciated shares to a donor-advised fund

If charitable giving is part of your plan — now or eventually — donating appreciated shares to a donor-advised fund (DAF) is the most tax-efficient version. The structure:

1. Transfer shares (not cash) directly to the DAF. You never sell them.
2. Receive a deduction for the full fair market value — not just your cost basis.³
3. The DAF sells the shares. As a tax-exempt entity, it pays no capital gains tax.³
4. Recommend grants from the DAF to charities on your own timeline.

For a $500K position with a $50K basis: donating to a DAF eliminates the entire $450K gain — saving up to $107,100 in federal capital gains tax at 23.8% — while giving you a $500K FMV deduction. The deduction is subject to the 30% of AGI limit for appreciated property per IRC §170(b)(1)(C);³ any unused deduction carries forward for five years.⁴

Strategy 4: Exchange funds

An exchange fund (sometimes called a swap fund) allows investors with large concentrated positions to pool their stock with other investors holding different single-name positions. You contribute your shares; you receive a proportional interest in a diversified pool. After a required 7-year holding period, you can redeem a diversified basket — typically 20–30 different stocks — without triggering a taxable event at the time of contribution.

Key constraints to understand before pursuing this:

• Minimum: Most exchange funds require $1M–$2M per contributing position, sometimes more.
• Illiquidity: The 7-year lockup is real and enforced. This is appropriate only for capital you genuinely don't need for seven years.
• Tax deferral, not elimination: The carryover basis carries into the diversified basket. When you eventually sell the redeemed shares, the original gain is recognized. The benefit is time value — deferring a $200K+ tax bill for seven or more years while investing a diversified portfolio.
• Access: Exchange funds are not publicly marketed. Access typically requires a private wealth advisor with relationships at the few firms that operate them.

Strategy 5: Collars and structured hedging

A protective collar uses options to cap downside risk without selling the underlying position. You buy a put option (protection against decline) and sell a call option (cap your upside), often structured so the call premium covers the put cost — a "costless collar." This reduces concentration risk economically without triggering an immediate taxable event.

The tax treatment involves constructive sale rules (IRC §1259): if the collar is too tight — effectively locking in a specific price — the IRS may treat it as a sale. Working with a tax-aware advisor to structure the collar above the constructive sale threshold is essential. Collars are primarily a risk management tool, not a tax optimization strategy, but they're worth understanding if you want downside protection during a multi-year phased sale.

Estimate your diversification tax cost

Enter your position details to see what immediate vs. phased diversification would cost in federal taxes. Assumes MFJ filing, 2026 rates.

Putting it together: what a fee-only advisor actually does

These strategies don't work well in isolation. A fee-only advisor with concentrated position experience will:

• Model the multi-year tax projection — combining phased sales, loss harvesting, and charitable giving in the specific sequence that minimizes total tax over your full planning horizon
• Coordinate with your CPA to integrate gain realization with Roth conversions, IRMAA management, and any estate transfers you're considering
• Evaluate exchange fund access if your position is large enough and the illiquidity is appropriate
• Build a sale schedule tied to your actual income profile — not a generic rule that ignores the interaction between your salary, investment income, and the gain

At $2M–$20M net worth, the advisor fee for this work — typically a flat project fee of $3,000–$10,000 or included in an annual relationship — is usually recovered within the first year's tax savings from phasing alone. The complexity is real; the savings are real.

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