Stock Options and Estate Planning: What Happens to ISOs and NQSOs When You Die?

Most estate planning guides treat stock options as an afterthought. That's a problem when your ISOs or NQSOs are worth more than your house. Options have transfer restrictions, expiration clocks, and income-tax consequences that don't disappear at death — they get inherited by your estate, your executor, and your beneficiaries.

This guide covers the rules your estate attorney needs to know: what happens to unexercised options at death, how the IRS taxes them, when and how you can gift NQSOs during your lifetime, and how the current $15 million estate exemption changes the planning math for most tech employees.

What Happens to Your Options at Death

The first question your executor will face: are the options vested? Unvested and vested options are treated differently at death.

Unvested Options

Unvested options are controlled entirely by the plan document. Three possible outcomes:

• Single-trigger acceleration: All unvested options immediately vest upon death. This is common in startup grants and many public-company plans.
• Partial acceleration: Some plans accelerate only the next 12 months of unvested grants, or use a sliding scale based on tenure.
• Forfeiture: Less common today, but some older or smaller-company plans simply terminate unvested options at death. The estate receives nothing for them.

Read the plan document and your specific grant agreement carefully — the terms are binding and vary significantly across companies. Your estate attorney should request copies of both documents as part of the estate inventory.

Vested, Unexercised Options

Vested but unexercised options don't simply transfer to your estate indefinitely. Most plans provide a post-death exercise window — typically 12 months from the date of death for the estate or designated beneficiaries to exercise. Some plans allow 18 to 24 months; some shorten the window to as little as 6 months.

If the window expires without exercise, the options are forfeited regardless of how in-the-money they are. Executors must act quickly, particularly when the estate is complex and probate moves slowly.

ISO Treatment at Death

ISOs carry a statutory transfer restriction: under IRC §422(b)(5), an ISO must be exercised by the employee during their lifetime.¹ This restriction has a critical carve-out: transfers at death.

Under IRC §422(c)(6), if an employee acquires stock by exercising an ISO and then dies, the transfer of those shares to the estate or beneficiary by will or the laws of descent and distribution does not constitute a disqualifying disposition.² The holding-period clock that ran during the employee's lifetime carries over to the beneficiary.

Practically, this means:

• If the employee had already held the shares long enough to satisfy the qualifying-disposition rules (2 years from grant, 1 year from exercise), the beneficiary inherits shares that can be sold as qualifying — ordinary LTCG treatment on the spread.
• If the employee died before the qualifying period elapsed, the beneficiary continues the clock. A beneficiary who inherited ISO shares 6 months post-exercise would need to hold them another 6 months before selling to achieve qualifying-disposition treatment.
• ISO shares inherited at death also get a stepped-up basis for estate-tax purposes, but the income-tax basis remains the original exercise price for income-tax calculations on disposition.

Can the Estate Exercise Unexercised ISOs?

This is where it gets complicated. §422(b)(5) generally prohibits ISO exercise by anyone other than the employee. However, the IRS has historically allowed estate exercise of ISOs within the plan's post-death window without automatic conversion to NQSO treatment, provided the exercise occurs within the remaining option term and within the plan-specified post-death window. The regulations (Treas. Reg. §1.422-2) provide some guidance, but plan documents vary.

In practice: many corporate plans explicitly authorize the estate or a designated beneficiary to exercise ISOs after death. If the plan permits it, the spread at exercise may still create an AMT preference item — consult a tax advisor before the estate exercises ISOs on a large grant.

NQSO Treatment at Death

NQSOs are simpler at death because they don't carry the ISO transfer restrictions. Vested NQSOs held unexercised at death are typically exercisable by the estate or beneficiary during the plan's post-death window.

When the estate exercises a NQSO, the spread (FMV minus exercise price at exercise) is ordinary income. For estate-tax purposes, the unexercised NQSO's in-the-money value is included in the gross estate at the date-of-death FMV of the spread. This creates a potential double-tax problem: the same economic value is both in the estate and taxed as ordinary income when exercised.

Income in Respect of a Decedent (IRD)

Unexercised NQSOs at death are classic income in respect of a decedent (IRD) under IRC §691.³ IRD is income the decedent had earned (the option spread accrued during employment) but had not yet recognized at death.

The IRD rules work as follows:

• The NQSO spread is included in the estate's gross value for estate-tax purposes at the date-of-death FMV.
• When the estate or beneficiary exercises the NQSO, the spread is ordinary income to the recipient.
• The estate or beneficiary receives an IRD deduction under §691(c) — a deduction equal to the estate tax actually paid that is attributable to the NQSO IRD item. This partially offsets the double taxation.

Note: If the total estate exceeds $15M and estate tax applies, the §691(c) deduction reduces the income tax on the IRD proportionally.

Gifting Stock Options During Your Lifetime

Transferring options to family members or trusts while you're alive is a separate question from death transfers — and the rules differ sharply between ISOs and NQSOs.

ISOs Cannot Be Gifted

ISOs carry a strict non-transferability requirement under §422(b)(5): the option can only be exercised by the employee during their lifetime. Any attempt to transfer an ISO to another person — including a spouse, child, or trust — causes the option to immediately lose its ISO status and become a NQSO. The entire benefit of ISO treatment (AMT instead of ordinary income at exercise, LTCG on qualifying dispositions) disappears.

Exception: transfers to a grantor trust (revocable trust) where the employee remains the grantor and the trust is transparent for income-tax purposes do not trigger conversion. ISO shares acquired through exercise can be held in a revocable trust without losing ISO-acquired-stock treatment under §422(c)(6).

NQSOs Can Often Be Gifted — With a Catch

Many public-company plans allow vested NQSOs to be transferred to immediate family members (spouses, children, grandchildren) or family trusts. The SEC issued no-action guidance in the mid-1990s permitting these transfers, and it became common for companies to include the provision in plan documents after 2000.

The tax mechanics are counterintuitive: even though you gift the NQSO to a family member, you (the donor) recognize ordinary income at the time the recipient exercises the option. The income recognized equals the spread at exercise, taxable to the donor, not the recipient. This makes NQSO gifting less of a tax savings tool and more of an estate-planning tool — you shift the future option value out of your estate while accepting the income-tax hit when the option is exercised.

Early Exercise + 83(b) as an Estate Planning Tool

If you're at a pre-IPO company with options that have a low 409A valuation, early exercise + an 83(b) election converts an option into stock immediately. The stock — not the option — is then what your estate holds. This has several estate-planning implications:

• Future appreciation outside your estate: If you gift the stock to a trust after the 83(b) election while the value is near the strike price, future appreciation on all those shares accrues outside your estate.
• QSBS stacking: Each trust that holds qualifying QSBS stock gets its own separate $15 million exclusion cap under the OBBBA. If you have a 5-year holding period and $30M of QSBS appreciation, structuring ownership across two separate trusts doubles the exclusion capacity.
• No more exercise-window risk: Once you own the stock (not the option), there's no post-termination exercise window countdown. Simplifies executor's job significantly.
• Stepped-up basis at death: Appreciated stock held until death receives a stepped-up cost basis, eliminating embedded capital gains tax — though under OBBBA this interacts differently with the IRD rules that applied to the old options.

The catch: early exercise requires cash for the exercise price and income tax on the 83(b) ordinary income (fair market value at exercise minus the exercise price, often zero if exercised at grant). And QSBS clock requires a 5-year hold, so the strategy requires a long time horizon.

Planning Checklist: Stock Options and Your Estate

1. Locate all grant agreements and the plan document. Know the post-death exercise window and whether unvested options accelerate at death.
2. Review beneficiary designations. Brokerage accounts holding exercised options typically have TOD (transfer-on-death) designations separate from your will.
3. Tell your executor where options live and about the window. A vested NQSO worth $3M expires worthless if the estate misses the exercise deadline.
4. Check whether your employer plan allows NQSO transfers. If you have valuable NQSOs and a large estate, gifting them to a family trust now removes future appreciation from your estate (though you'll pay income tax at exercise).
5. Don't gift ISOs. Any attempted lifetime transfer converts them to NQSOs, losing the AMT treatment and qualifying-disposition potential.
6. Consider early exercise + 83(b) for low-409A pre-IPO options. Converts an illiquid, expirable option into stock with a running QSBS and holding-period clock.
7. Model the OBBBA $15M exemption against your total estate. If you're below $15M including option values, estate tax isn't the concern — income tax management on exercise is. Prioritize that.
8. Coordinate with your estate attorney on trust structures before exercising large option grants. Structure first, exercise second — not vice versa.

When to Involve a Specialist Advisor

Stock-option estate planning sits at the intersection of employment law (plan documents), income tax (exercise mechanics, IRD), estate and gift tax (exemption, trust structures), and securities law (10b5-1, insider trading during estate). Most estate attorneys know one of these; few know all four.

A fee-only financial advisor who specializes in equity compensation can:

• Model your total option values across all grants and flag estate-tax thresholds
• Coordinate with your estate attorney on trust structures that accommodate ISO and NQSO differences
• Identify whether early exercise + 83(b) makes sense before your next grant or liquidity event
• Structure a post-death exercise plan for your executor that preserves value and meets deadlines

1. IRC §422(b)(5) — ISO non-transferability requirement: the option must be exercisable only by the employee during their lifetime. law.cornell.edu/uscode/text/26/422
2. IRC §422(c)(6) — special rule: a transfer of ISO shares at death to the estate or beneficiary by will or descent and distribution is not a disqualifying disposition; holding period of the decedent carries over. law.cornell.edu/uscode/text/26/422
3. IRC §691 — income in respect of a decedent (IRD); §691(c) — IRD deduction for estate tax attributable to IRD items. law.cornell.edu/uscode/text/26/691
4. One Big Beautiful Bill Act (OBBBA, July 2025) — permanently set estate/gift/GST exemption at $15 million per person, inflation-indexed. Prior TCJA temporary exemption eliminated. Cross-checked: Tax Foundation, Kiplinger.

Values verified May 2026. Tax law changes frequently; confirm current rules with a qualified attorney and tax advisor before making estate planning decisions involving stock options.