Concentrated stock and post-liquidity transition playbooks
A large position in one stock usually arrives the same way: years of equity compensation, a founder's shares, or an acquisition paid in the buyer's stock. At some point the household decides to reduce it. Whether and how fast is an investment decision. But every way of reducing a position has a tax result, and the tax result depends on records that many households cannot produce on short notice: basis, acquisition dates, the type of grant, and any restrictions on sale.
This post covers the tax side of reducing a concentrated stock position in 2026: what records to assemble, how the main approaches are taxed, and which questions belong to your preparer, your investment advisor, and counsel. It is not investment advice and it does not recommend any strategy. It is a framework for walking into that conversation with the facts ready.
Start with the lot record
Before any decision, build a lot-level record of the position. For each lot:
- Acquisition date and how it was acquired (purchase, RSU vest, option exercise, ESPP, founder grant, merger exchange, gift, inheritance).
- Basis per share and the document that proves it.
- Whether the holding period is over one year.
- For incentive stock options, the exercise date and the spread at exercise, because of the alternative minimum tax and the special holding periods (more than two years from grant and more than one year from exercise).
- For ESPP shares, the offering and purchase dates, for the same reason.
- Whether any lot might be qualified small business stock under IRC Section 1202.
Brokerage-reported basis for RSUs and ESPP shares is often wrong or incomplete because the compensation portion was already taxed on the W-2. If the 1099-B basis does not include that amount, the gain gets taxed twice unless the preparer adjusts it. The supplemental statement from the plan administrator is the document that fixes this.
A note on ISOs and the AMT in 2026
Exercising incentive stock options and holding the shares adds the spread at exercise to alternative minimum taxable income. For 2026, the AMT exemption is $140,200 on a joint return and $90,100 for a single filer, and it phases out at 50 cents per dollar of AMTI above $1,000,000 joint or $500,000 single. That phase-out rate is faster than in 2025, so a large exercise can reach the AMT sooner than prior-year experience suggests. AMT paid because of ISO exercises can create a minimum tax credit for later years (Form 8801), which is one more reason to keep every year's AMT computation in the lot record. A projection before exercising, not after, is the preparer's job.
How the main approaches are taxed
Selling over time
The simplest approach. Long-term gain for 2026 is taxed at 0%, 15%, or 20% federally. The 20% rate applies to gain above $613,700 of taxable income on a joint return ($545,500 single). The 3.8% net investment income tax applies above modified AGI of $250,000 joint or $200,000 single. Spreading sales across tax years can keep more gain in the 15% bracket and can change state tax as well. Selling specific lots (specific identification) instead of the default first-in, first-out method lets you choose high-basis lots first. Lot selection must be made with the broker at the time of sale, not afterward.
Gifts to family
Gifted shares carry the donor's basis to the recipient. The 2026 annual exclusion is $19,000 per recipient, and the basic exclusion amount is $15,000,000. Shifting shares to a family member in a lower bracket can lower the tax rate on the eventual sale, but the kiddie tax taxes a child's unearned income above a threshold at the parent's rate (it generally applies to children under 19, or under 24 if a full-time student). Gifts of shares near a planned sale raise assignment-of-income questions. Timing belongs to counsel and your preparer.
Gifts to charity
Donating appreciated shares held more than one year to a public charity or donor-advised fund generally allows a deduction at fair market value, limited to 30% of AGI, with a five-year carryforward. The household avoids tax on the gain. Starting in 2026, itemized charitable deductions are reduced by 0.5% of AGI, and for taxpayers in the 37% bracket the tax benefit of itemized deductions is limited to 35 cents per dollar. A private foundation receiving publicly traded stock has a lower AGI limit. The record that matters is the contemporaneous written acknowledgment from the charity, and for gifts of non-publicly traded stock over $10,000, a qualified appraisal.
Qualified small business stock
If the stock is QSBS, part or all of the gain may be excluded. For stock acquired after July 4, 2025, the exclusion is 50% after three years, 75% after four years, and 100% after five years, with a per-issuer cap of the greater of $15,000,000 or 10 times basis. The corporation's gross assets limit for new issuances rose to $75,000,000. Stock acquired earlier keeps the old rules: a five-year holding period and a $10,000,000 cap. QSBS status depends on facts at the company level, so the record needed is a statement or representation from the company, not an assumption.
Installment sales
For privately held stock sold to a buyer who pays over time, the installment method under IRC Section 453 spreads gain as payments arrive. Publicly traded stock is not eligible. Interest on large installment obligations can apply. This is a negotiated transaction with counsel on both sides.
Exchange funds and hedging
Some advisors offer exchange funds, where many holders contribute concentrated positions to a partnership in exchange for a diversified interest, generally without immediate gain if the partnership meets the diversification and holding rules (seven years is common). Hedging strategies such as collars or prepaid variable forwards can trigger a constructive sale under IRC Section 1259 if they eliminate too much risk. Both are complex. The tax question for your preparer is how the transaction will be reported. The decision whether to use either belongs to you and your investment advisor, with counsel reviewing the documents.
Holding until death
Assets held at death generally receive a basis equal to fair market value at the date of death under IRC Section 1014, which removes the built-in gain. That is a real factor, but it is an estate planning question, not a reason on its own to keep a position.
Restrictions that are not tax rules
Insiders and large holders face securities law limits: trading windows, Rule 144 volume limits, lockups after an IPO or acquisition, and Rule 10b5-1 trading plans. These are questions for securities counsel and the company's general counsel. They affect timing, and timing affects tax, so the tax plan has to work within them.
The scored diagnostic
Score each item 0, 1, or 2. Zero means missing. One means partial. Two means complete and documented.
| Item | 0, 1, or 2 |
|---|---|
| Lot-level record with dates, acquisition type, and basis | |
| Supplemental basis statements for RSU and ESPP lots | |
| ISO exercise records and AMT history | |
| QSBS status confirmed in writing by the company, or ruled out | |
| Trading restrictions listed with dates | |
| A multi-year projection of gain by tax year from the preparer | |
| State residency for each sale year confirmed | |
| Estimated tax plan for each sale year |
A total of 13 to 16 means the household can evaluate options on the facts. Below 10, build the record first.
Illustrative: RSUs, ISOs, and a move
Illustrative: An employee at a public company holds shares from six years of RSU vests, some ISO exercises, and ESPP purchases. Together they are about 60% of the household's liquid assets. The household plans to move from California to Texas next year.
The lot record shows the 1099-B basis on the RSU lots excludes the income already reported on W-2s. Two ISO lots exercised last year have not met the holding periods, and a sale now would be a disqualifying disposition taxed partly as ordinary income. The move matters too: California generally taxes residents on all gains and can source part of option and RSU income to California even after a move, based on where the work was done during the vesting period.
The preparer's job is a projection by year and state. The investment advisor's job is the pace. Counsel's job is the residency change and any trading window. Nobody can do their job well without the lot record.
Records to keep after each sale
- Trade confirmations with lot selection.
- 1099-B and the plan administrator's supplemental statement.
- Form 3921 (ISO exercises) and Form 3922 (ESPP transfers).
- Charity acknowledgments and appraisals.
- Any company representation on QSBS status.
Next step: ask the plan administrator for a full lot history with supplemental basis, and send it to your preparer with the dates of any planned move.
Educational only. This is not tax or legal advice for your situation. Consult your own CPA, EA, or attorney before acting.
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