Concentrated Stock Position Estate Planning

You held the position for decades — founder equity, inherited shares, years of restricted stock that vested. Now it's $10M at a $400K cost basis. Selling triggers $2.3M in federal capital gains. Holding puts it in your taxable estate. Giving it away means your heirs receive nothing from it. Here is how high-net-worth families resolve this three-way conflict.

The three-way tension

Unlike cash or a diversified portfolio, a low-basis concentrated position creates three conflicts at once:

1. Income tax risk. Selling triggers long-term capital gains. At the top federal rate (23.8%), a $9.6M gain costs $2.3M before state tax. High-tax states like California (13.3%) and New York (10.9%) add another $1-1.3M on top.
2. Estate tax risk. Holding means the full $10M is in your taxable estate. For individuals with total estates above $15M ($30M married), every dollar is taxed at 40% at death.
3. Access and diversification risk. Transferring the position — to a trust, to charity, to heirs — trades control and liquidity for tax efficiency. Concentration risk is also real: a 50% drop in the underlying stock halves the value while you wait for the step-up.

Which risk dominates depends on your total estate size, your time horizon, your charitable intent, and the nature of the underlying asset (public vs. closely-held, QSBS-qualifying vs. ordinary shares).

Strategy comparison tool

Model three core scenarios for your position. Trust-based strategies (GRAT, IDGT, FLP) transfer future growth outside the estate without triggering gains — they require advisor analysis and are described below.

Strategy 1: Hold until death — step-up in basis

For families whose total estate stays below the federal exemption ($15M single / $30M married), holding appreciated stock until death is usually the most tax-efficient outcome:

• Heirs receive the stock with a new cost basis equal to its fair market value at your date of death per IRC §1014. If the stock is worth $12M when you die, their basis is $12M — zero embedded capital gains regardless of what you originally paid.
• No capital gains taxes during your lifetime.
• No estate tax if total estate is below the exemption.

When the hold strategy breaks down:

• Estate exceeds the exemption. In a $35M single-person estate (above $15M exemption), holding the $10M position means roughly $4M of it is lost to estate tax at 40% × ($35M - $15M) / $35M × $10M.
• Concentration risk. A 60% drop in the stock (not unusual for single-company exposure) eliminates the step-up benefit and leaves less for heirs regardless.
• Decades-long hold with uncertain legislation. Congress has periodically proposed eliminating IRC §1014 — it has not happened, but it is a long-term legislative risk.

Strategy 2: Sell and diversify

Selling ends concentration risk and provides liquidity, but the tax cost is substantial and does not solve the estate tax problem:

• Federal LTCG + NIIT: gain × 23.8% at top bracket. On a $9.6M gain, that is $2.3M in federal tax before state.¹
• After paying $2.3M in taxes, the net proceeds (~$7.7M) remain in your estate — you have simply converted $10M of concentrated stock into $7.7M of diversified assets. Estate tax exposure is slightly reduced but not eliminated.
• State capital gains taxes apply on top: California adds 13.3% (so a California resident's effective federal + state rate is ~37%), New York adds ~10.9%.

Selling makes the most sense when the position's concentration risk is extreme (a single employer or startup with binary outcomes), when you have capital loss carryforwards to offset the gain, when your estate is comfortably below the exemption (so estate tax is not the issue), or when you are in an unusually low-income year that keeps you in the 15% LTCG bracket.

Strategy 3: Donor-advised fund or charitable remainder trust

Donating appreciated stock to charity is the cleanest exit from a concentrated position — but heirs receive nothing from that portion of the estate.

Donor-advised fund (DAF)

• No capital gains tax. You contribute shares at fair market value; the DAF sells tax-free inside the fund.
• Charitable deduction up to 30% of AGI for long-term appreciated property (5-year carryforward for excess).
• Position removed from taxable estate immediately.
• You retain advisory control over grantmaking — you can recommend grants to the causes you care about — but you cannot retrieve the funds or leave them to heirs.

Charitable remainder unitrust (CRUT)

• Contribute the position to an irrevocable trust. The trust sells the stock tax-free and reinvests proceeds. You receive an annual income stream (5%+ of the trust's value each year) for life or a specified term.
• Partial charitable deduction equal to the present value of the remainder (typically 30–50% of contribution at the §7520 hurdle rate of 5.00% May 2026³).
• Position removed from taxable estate; income stream replaces the asset for your lifetime.

See the DAF estate planning guide and charitable remainder trust guide for detailed analysis.

Strategy 4: GRAT — extract appreciation above the §7520 hurdle rate

A Grantor Retained Annuity Trust (GRAT) is the most common technique for extracting appreciation from a concentrated position without triggering capital gains:

• You contribute the position to an irrevocable trust and receive back an annuity stream over the trust term (typically 2–5 years), sized so the gift is valued at near zero for gift tax purposes ("zeroed-out GRAT").
• No capital gains on the contribution. Because the trust is a grantor trust under IRC §671-679, any sale inside the trust is ignored for income tax — you and the trust are treated as the same taxpayer per Rev. Rul. 85-13.
• If the position's total return exceeds the §7520 rate (5.00% in May 2026), the excess passes to heirs gift-tax-free at the end of the term.
• If the position underperforms 5.00%, the annuity payments return the full value to you — no estate tax cost, no gift tax cost, just the legal fees to set it up.

GRATs work best for positions with high expected near-term appreciation — pre-IPO equity, a business ahead of a liquidity event, a real estate portfolio before a refinancing. Rolling two-year GRATs are common for volatile positions: if the stock drops in year 1, you restart with a new GRAT on the reduced value.

Strategy 5: IDGT installment sale — move current value outside the estate at AFR

An Intentionally Defective Grantor Trust (IDGT) installment sale differs from a GRAT in one key way: it transfers the entire current value of the position outside your estate, not just the appreciation above the hurdle rate:

• You sell the position to an irrevocable grantor trust at its fair market value, receiving an installment note bearing interest at the Applicable Federal Rate (mid-term AFR: 4.08% in May 2026³).
• No capital gains on the sale. Grantor trust treatment under IRC §671–679 means the sale is disregarded for income tax (same taxpayer rule, Rev. Rul. 85-13). The gain is not recognized.
• All future appreciation on the entire $10M position — not just the part above the hurdle — grows inside the trust, permanently outside your estate.
• The trust pays back only AFR interest plus principal. If the stock returns 18%, the $18M trust owes you ~$4.3M in AFR payments and $10M in principal — the remaining $3.7M+ stays in trust for heirs.

The trust requires a "seed gift" of approximately 10% of the sale price (to be a legitimate purchaser). The seed gift uses lifetime exemption — so the IDGT uses less exemption than a direct gift of the same asset. The position also needs to be valued correctly; closely-held business interests or illiquid assets typically require a qualified appraisal.

See the IDGT installment sale guide and calculator for a year-by-year schedule.

Strategy 6: Family limited partnership (FLP) with valuation discounts

For concentrated positions held in closely-held businesses, real estate, or investment entities (not publicly-traded stock), an FLP or family LLC can apply valuation discounts before gifting:

• Contribute assets to an FLP. Your limited-partnership interest — which lacks control and marketability — is valued at a discount of 25–45% below the underlying asset value (15–35% minority discount + 10–30% lack-of-marketability discount).
• Gift discounted interests using the annual exclusion ($19,000 per donee in 2026⁴) and lifetime exemption. You effectively transfer more economic value per exemption dollar than a direct gift of the underlying asset.
• Combined with an IDGT installment sale: sell FLP interests (at discount) to a grantor trust at AFR — this stacks the discount benefit on top of the installment sale's gain-deferral.

FLP strategies must have a legitimate business purpose to survive IRC §2036 audit risk (the IRS challenges structures where the grantor retains de facto control). See the FLP estate planning guide for the bona-fide-sale exception requirements.

Special case: Qualified Small Business Stock (QSBS)

If the concentrated position is founder or early-investor stock in a qualifying C-corporation, IRC §1202 QSBS exclusion may eliminate the capital gains problem entirely:

• The One Big Beautiful Bill Act (OBBBA, July 2025) permanently raised the QSBS exclusion to $15M per taxpayer per issuer, with a tiered exclusion rate: 50% at 3-year hold, 75% at 4 years, 100% at 5+ years.⁵
• Qualifying criteria: C-corporation, gross assets ≤ $50M at time of issuance, active business in a qualifying industry (software, manufacturing, retail — not financial, legal, hospitality).
• At a 5-year hold, the first $15M of gain per taxpayer is 100% excluded from federal capital gains and AMT. On a $10M gain, this means zero federal income tax on the sale.

If your position qualifies, QSBS exclusion changes the entire calculus — you can sell without the capital gains burden, removing the primary reason to hold. Work with your tax advisor to confirm qualification before acting, because the rules are strict and the statute of limitations on QSBS disqualification is long.

Decision matrix: choosing the right strategy

Layering strategies

Most HNW families with large concentrated positions use several strategies in combination, not just one:

• GRAT for near-term appreciation on the riskiest part of the position (pre-IPO, growth equity).
• IDGT installment sale for the portion where you want to move current value, not just growth, outside the estate.
• Annual exclusion gifting ($19K/donee/year) for smaller ongoing transfers without touching lifetime exemption.
• DAF contribution on the tax-loss portion (if the position has declined) — or on a portion where charitable intent exists, to offset income taxes in a high-income year.
• Hold the remainder for the step-up if estate is below or near the exemption.

The order and timing of these strategies matters because each affects your remaining lifetime exemption, your gift tax return obligations (Form 709 filing requirements), and your estate size for future planning.