Year-End Stock Option Tax Planning Checklist 2026

For tech employees and founders holding ISOs, NQSOs, RSUs, or ESPP shares. Not tax or investment advice — the right moves depend heavily on your specific numbers.

1. ISO holders: check your remaining AMT headroom

For every ISO you exercise and hold (without selling in the same calendar year), the spread — FMV at exercise minus strike price — becomes an AMT preference item under IRC §56(b)(3).¹ How much AMT exposure you can absorb before it costs you real money depends on your "safe zone" — the number of ISO shares you can exercise before AMT exceeds your regular tax.

2026 AMT parameters (OBBBA):

• Exemption: $90,100 (single) / $140,200 (married filing jointly)²
• Phaseout threshold: $500,000 single / $1,000,000 MFJ (phaseout rate 50% — reverted from pre-OBBBA 25%)
• AMT rate: 26% on AMTI up to $239,900; 28% above

Use the ISO Exercise AMT Calculator to find your current safe exercise zone before year-end. Then ask: do you have room to exercise a tranche of ISOs before December 31 and stay below AMT breakeven? If yes, that tranche starts the 12-month LTCG clock and potentially the QSBS 5-year clock without triggering AMT. If you're already close to AMT breakeven, doing a disqualifying disposition (exercise and immediate sale) on a portion avoids AMT entirely — you pay ordinary income on that tranche, but the AMT preference disappears.³

2. NQSO holders: FICA wage base check

Unlike ISOs, NQSO exercises are always W-2 ordinary income — no AMT, no holding period benefit — but they generate FICA taxes. The 2026 Social Security wage base is $184,500.⁴ Once your total W-2 wages for the year (salary + bonuses + prior exercises) exceed $184,500, no more Social Security tax (6.2%) applies. Only Medicare (1.45%) and Additional Medicare Tax (0.9% above $200,000 single / $250,000 MFJ) continue.

This creates a concrete within-year timing opportunity. If your salary alone will push you past $184,500 by October, an NQSO exercise in Q4 costs only 2.35% in FICA instead of 7.65% — a $15,300 savings on a $300,000 exercise, purely from timing within the same tax year. If you're in Q4 and haven't hit the wage base yet, it may be worth waiting until your salary crosses it before exercising.

See the full framework: When to Exercise NQSO Stock Options.

3. LTCG bracket management for selling decisions

Long-term capital gains (from shares held over 12 months post-exercise) are taxed at preferential rates. For 2026 single filers:⁵

MFJ thresholds: 0% up to $98,900; 20% above $613,700. Source: IRS Rev. Proc. 2025-32.

Year-end moves to consider:

• Harvest gains at 15% if your taxable income this year will stay below $545,500 (single). Selling post-IPO shares or exercised ISO/NQSO lots held over 12 months while you're in the 15% bracket rather than deferring into a year when you'll be in the 20% bracket saves 5 percentage points plus the 3.8% NIIT difference.
• Fill the 0% bracket if your taxable income this year is well below $49,450 after deductions — perhaps a gap year or parental leave year. Long-term gains recognized below that threshold are federally tax-free.
• Check the NIIT cliff. The 3.8% Net Investment Income Tax applies to qualifying ISO dispositions (investment income) when MAGI exceeds $200,000 single / $250,000 MFJ.⁶ NQSO spreads are W-2 income, not investment income — NIIT doesn't apply. ISO qualifying dispositions above the threshold cost 23.8% federal (20% + 3.8%), not 20%.

4. Maximize pre-tax accounts to create bracket room

Contributions to 401(k) plans and HSAs reduce your ordinary income, which directly affects how much of your equity comp lands in higher brackets.

2026 contribution limits:⁷

• 401(k)/403(b)/457: $24,500 employee deferral limit
• 401(k) catch-up (age 50–59 and 64+): additional $8,000 → $32,500 total
• 401(k) super catch-up (ages 60–63, SECURE 2.0): additional $11,250 → $35,750 total
• Traditional or Roth IRA: $7,500 (plus $1,000 catch-up at 50+, for $8,500 total)
• HSA self-only coverage: $4,400; family: $8,750 (additional $1,000 catch-up at 55+)

If you're planning a large NQSO exercise in Q4, confirm your 401(k) contributions are maxed first. Every dollar contributed pre-tax reduces the income against which the NQSO spread is measured — keeping more of the gain in the 32% bracket versus 35% or 37%.

5. AMT credit recovery opportunities

If you paid AMT in prior years from ISO exercises, you have a minimum tax credit (MTC) under IRC §53 that carries forward indefinitely and recovers tax dollar-for-dollar in years when your regular tax exceeds AMT.¹ Year-end is a good time to review whether you can create AMT headroom to accelerate the recovery.

Strategies to create regular-tax-over-AMT spread:

• ISO qualifying dispositions (selling ISO shares that have met both holding periods) remove the AMT preference item and generate LTCG income — regular tax rises, AMT falls
• Disqualifying dispositions on ISOs also help: the spread becomes ordinary income (regular tax), eliminating the preference item (AMT)
• A year with high W-2 income from NQSO exercises or RSU vesting but no ISO exercises often produces natural MTC recovery

See the full framework: ISO AMT Credit Carryforward Guide.

6. Charitable giving with appreciated stock

Donating appreciated shares directly to a donor-advised fund (DAF) or charity before December 31 gives you two simultaneous benefits: a charitable deduction at full current market value AND elimination of the capital gain you would have recognized on a sale.⁸

This is most powerful with long-term appreciated shares (ISO qualifying disposition shares, post-IPO RSUs held 12+ months, ESPP qualifying disposition shares). You avoid the capital gains tax entirely — at 20% plus 3.8% NIIT on large positions, that can mean avoiding $23,800 in federal tax on $100,000 of appreciation. The deduction reduces your ordinary income in the same year.

Key: you must transfer shares — not cash — before December 31. DAF transfers must be completed (not just initiated) by year-end. Confirm processing time with your custodian in early December, not the week before Christmas.

7. Review options approaching expiration

Under IRC §422(b)(1), ISOs expire no later than 10 years from grant date (5 years for 10%+ shareholders).³ If any of your option grants expire within the next 90 days, you face an irreversible deadline that overrides every other consideration. A suboptimal tax outcome — even exercising ISOs at AMT breakeven, or exercising NQSOs in a high-income year — is infinitely better than forfeiting the entire option value.

Check your grant agreements for expiration dates, not just the canonical "10 years from grant" rule. Some plans have shorter contractual terms. Post-termination exercise windows may have already shortened a prior 10-year grant to 90 days or less from your departure date.

See: Stock Options About to Expire: What to Do.

8. Verify estimated tax payments

Large option exercises mid-year often produce income that exceeds employer withholding. If your withholding plus estimated tax payments don't cover at least 90% of your 2026 tax liability — or 110% of your 2025 liability (whichever is lower) — you'll owe an underpayment penalty under IRC §6654.

The Q4 estimated tax deadline is January 15, 2027 (for Q4 2026 income). If you exercised options in Q3 or Q4 without sufficient withholding, a Q4 estimated payment by January 15 can prevent the penalty. California and other states with their own estimated tax rules may have earlier deadlines — check your state's requirements separately.

Year-end action checklist by option type

When to bring in a specialist

The interactions between ISO AMT, NQSO ordinary income, LTCG bracket management, and pre-tax contributions compound quickly. A specialist who has modeled hundreds of tech equity packages can find material savings — AMT avoidance alone often pays for advisory fees 5–10× over. Q4 is the highest-leverage time to engage, when most decisions are still open.

Sources

1. IRC §53 — Credit for Prior Year Minimum Tax Liability (Cornell LII). AMT credit carryforward mechanics. ISO AMT preference under IRC §56(b)(3).
2. IRS — 2026 Tax Inflation Adjustments (IRS.gov, including OBBBA amendments). AMT exemption $90,100 single / $140,200 MFJ; phaseout $500K/$1M at 50% rate.
3. IRC §422 — Incentive Stock Options (Cornell LII). §422(b)(1): 10-year expiration; §56(b)(3): ISO AMT preference item.
4. SSA — Contribution and Benefit Base 2026 ($184,500). Social Security wage base.
5. IRS Rev. Proc. 2025-32 — 2026 Inflation Adjustments. LTCG 0%/$49,450 single; 20%/$545,500 single; 20%/$613,700 MFJ.
6. IRS — Net Investment Income Tax (3.8%). Applies to investment income when MAGI exceeds $200K single / $250K MFJ; ISO qualifying dispositions included; NQSO W-2 spreads excluded.
7. IRS — 401(k) Limit $24,500 for 2026, IRA Limit $7,500. Catch-up $8,000 (50+); super catch-up $11,250 (60–63, SECURE 2.0 §109). HSA 2026: $4,400 self-only / $8,750 family per IRS Rev. Proc. 2025-32.
8. IRS — Charitable Contribution Deductions. FMV deduction for appreciated property donated to qualified organizations; capital gain not recognized on donated shares.

Tax values verified for 2026 per IRS Rev. Proc. 2025-32, IRS Notice 2025-67 (retirement limits), and SSA OACT (wage base). Values subject to legislative change.