Concentrated Stock Diversification for $1M–$5M Investors

You hit $1M — partly or entirely because one stock ran up. Maybe it was four years of RSUs vesting, an IPO lock-up that finally expired, or shares you inherited from a parent who held them for decades. Now 40–70% of your net worth rides a single ticker. That's not a portfolio. That's a bet.

The tax cost of exiting is the main obstacle. A $500K gain taxed all at once in a high-income year can trigger a combined federal rate of 23.8% (20% LTCG + 3.8% NIIT¹). On a $500K position with a $50K basis, that's roughly $106K to the IRS before state taxes. Below are the four approaches that actually work at the $1M–$5M level — and a calculator to model the cost of each.

Interactive sell-down tax calculator

Model the federal tax difference between selling your position in one year vs. spreading it over multiple years. State taxes not included — add your marginal state rate to the results.

The calculator models federal LTCG rates and NIIT only. It assumes no change in your other income across years and that all shares are long-term (held >1 year). Real planning requires modeling your actual year-by-year income — that's where an advisor earns their fee.

Strategy 1: Staged sell-down (fill the bracket)

The simplest approach: sell enough each year to stay within the 15% LTCG bracket, deferring as much as possible at the 20% rate.

How it works. In 2026, long-term capital gains are taxed at 15% for taxable income up to $545,500 (single) or $613,700 (MFJ).² If your salary plus capital gains keeps you below those thresholds, you avoid the 20% rate. The NIIT (3.8% on NII when MAGI exceeds $200K single / $250K MFJ³) still applies above those thresholds, but avoiding the 20% tier still saves 5 points on the highest gains.

Tactical moves. Engineer low-income years: sabbatical, early partial retirement, a year between jobs. In those years, your marginal rate on LTCG can drop to 0% on gains up to $49,450 (single) or $98,900 (MFJ) stacked above your ordinary income.² If you're netting $80K and have a $400K concentrated position, you could realize $40K of gains per year tax-free while spreading the rest at 15%.

Best for: Anyone with flexibility in their income year-to-year. Also works well as a complement to any other strategy below.

Limitation: Stock-specific risk continues during the sell-down period. If the company implodes in year 3, you've already paid tax on what you sold — but you still hold the rest. This is the main argument for moving faster even if it costs more in taxes.

Strategy 2: Exchange fund (IRC § 721)

You contribute your appreciated stock to a partnership alongside other investors contributing their concentrated positions. In return you receive a proportional interest in a diversified pool — without triggering capital gains at contribution.

Tax mechanics. Under IRC § 721,⁴ contributing property to a partnership is not a taxable event. Your basis carries over to your partnership units. After a 7-year holding period required by § 1057(b),⁵ you can redeem your units for a basket of diversified securities. At redemption, you still owe the deferred gain — but it's been deferred for 7 years, and you now hold a diversified portfolio.

Practical requirements. Exchange funds must hold at least 20% illiquid assets (typically real estate limited partnership interests) to meet § 1057 safe harbor. Traditional exchange funds require $1M–$2M minimum contributions per position and are limited to accredited investors. Newer providers (e.g., Cache, Ethic) have lowered minimums to $250K–$500K, bringing this within range for $1M–$5M investors with a single large position.

Best for: A large single-stock position ($500K+) where you have no charitable intent and can lock up capital for 7 years. The math is compelling: no tax today, 7 years of diversification growth on what would have been a tax bill.

Limitation: 7-year illiquidity is real. If your stock collapses before you contribute, or the exchange fund's other holdings decline, your deferred basis becomes irrelevant because the gain shrank. Evaluate counterparty and fund-quality carefully.

Strategy 3: Donate to a donor-advised fund (DAF)

If you have charitable intent — even aspirationally — a DAF is the single most efficient exit from a concentrated stock position.

Tax mechanics. You contribute appreciated shares directly to the DAF. You receive a charitable deduction for the full fair-market value in the year of contribution (subject to AGI limits: 30% of AGI for appreciated capital-gain property, with 5-year carryforward).⁶ No capital gains recognized. The DAF sells the shares and invests the proceeds. You grant from the DAF to charities over time — immediately or over years.

Example. You earn $250K/year and hold $300K of employer stock with a $10K basis. Contributing the full position to a DAF: zero capital gains tax (saving ~$69K at 23%), $75K deduction this year (30% of $250K AGI), additional $225K deduction carried forward over 5 years. Net: you've given $300K to causes you care about, avoided $69K in taxes, and deducted $300K over 6 years.

Best for: Anyone who was already planning to give to charity at some point. The DAF accelerates the charitable deduction into a high-income year while letting you distribute grants over years or decades.

Limitation: The contribution is irrevocable. Once shares go into the DAF, you can never take them back. This is real money you're giving away; it needs to match your actual charitable intent.

Strategy 4: Charitable remainder trust (IRC § 664)

A CRT is a more complex version of charitable giving that also provides you with an income stream for life (or a term of years).

How it works. You contribute appreciated stock to an irrevocable trust. The trust sells the stock — tax-free within the trust, since CRTs are tax-exempt.⁷ The trust reinvests the proceeds and pays you an annuity stream (CRAT, fixed-dollar) or unitrust payout (CRUT, fixed-% of trust assets) for the term. At the end of the term, the remainder passes to charity. You get an upfront income-tax deduction for the present value of the charitable remainder (typically 10–40% of the contributed amount).

Example. You contribute $600K of stock (basis $20K) to a 5% CRUT at age 50. Trust sells shares for $600K — no capital gains. You receive $30K/year for life (5% of $600K, adjusting annually). Present value of charitable remainder generates ~$120K deduction today. Distributions are taxable to you as ordinary income, but 7+ years of deferral on the avoided capital gains typically makes this worthwhile.

Best for: $2M+ positions where you want income AND charitable impact. The setup cost (trust drafting, trustee fees) is real — typically $5,000–$15,000 to establish — so it only pencils out at larger sizes.

Limitation: Irrevocable. Complex to administer. Need a trustee (often a bank or charity). Best executed with an estate attorney and fee-only advisor coordinating.

Decision framework

Most common scenario at $1M–$5M: RSU holder with a $200K–$600K position, no charitable plans, needs liquidity. Staged sell-down over 3–5 years with tax-loss harvesting elsewhere to offset is the right starting point. Run the calculator above with your numbers to see what you're working with.

Sources

1. IRS — Net Investment Income Tax (3.8%), Q&A. NIIT applies to investment income when MAGI exceeds $200K (single) or $250K (MFJ). Enacted IRC § 1411.
2. Kiplinger — IRS Updates Capital Gains Tax Thresholds for 2026. 2026 0% bracket: $49,450 (single) / $98,900 (MFJ). 20% bracket: $545,501+ (single) / $613,700+ (MFJ). Source: IRS Rev. Proc. 2025-67.
3. IRS Publication 550 — Investment Income and Expenses. NIIT and capital gains treatment overview.
4. IRC § 721 — Nonrecognition of Gain or Loss on Contribution to Partnership. Statutory basis for exchange fund tax deferral.
5. IRC § 1057 — Exchange of Stock for Partnership Interest in Connection with Exchange Funds. 7-year holding period and 20% non-securities requirement for exchange fund safe harbor.
6. IRS Publication 526 — Charitable Contributions. 30% AGI deduction limit for appreciated capital-gain property donated to public charity; 5-year carryforward under IRC § 170(b).
7. IRC § 664 — Charitable Remainder Trusts. Tax-exempt treatment of CRT income; distribution rules; required 10% remainder interest test.

Tax rates and brackets verified for 2026 against IRS Rev. Proc. 2025-67 (Kiplinger, April 2026). IRC references are to the current Internal Revenue Code.