IPO Lockup Expiration: Tax-Efficient Sell Strategies (2026)

Your company IPO'd. The 180-day lockup lifts soon and you can finally sell. Most employees do one of two wrong things: sell everything on day one (a tax mistake worth five or six figures), or hold indefinitely while their concentration risk compounds. The right move is a written sell plan built before the lockup lifts — not the morning it does.

The 180-day lockup: what it is

A lockup agreement is a contractual restriction — negotiated between the company's underwriters and existing shareholders — that prohibits insiders and employees from selling shares for 180 days after the IPO pricing date.¹ It applies to most employees holding pre-IPO shares, double-trigger RSUs that delivered on IPO day, or stock options exercised prior to IPO. The purpose is to prevent a supply flood that would destabilize the post-IPO price.

Once the lockup lifts, you're legally free to sell — but "legally allowed" is the floor, not the strategy.

The holding-period math: why waiting 6 more months can be worth $50K+

Capital gains holding periods run from the date shares are delivered to your account — not the grant date, not the vest date of the original RSU grant. For double-trigger RSUs (where delivery happens on IPO day) and most IPO-day equity, the clock starts on the IPO pricing date.

At lockup expiration — 180 days, or roughly 6 months — any appreciation from your IPO-date cost basis is still short-term capital gain and taxed at your ordinary income rate. Waiting until 12 months from IPO converts that gain to long-term capital gain (LTCG).

2026 LTCG thresholds: 0% rate up to $49,450 (single) / $98,900 (MFJ); 20% rate starts at $545,501 (single) / $613,701 (MFJ). The 3.8% Net Investment Income Tax applies on investment income above $200,000 (single) / $250,000 (MFJ).²

Exception — early exercises with 83(b) elections: Founders and early employees who exercised options and filed an 83(b) election years before the IPO may already have 1+ year holding periods on those shares. Their IPO-day delivery was effectively a "conversion," not a new acquisition for tax purposes. An advisor can identify the specific holding-period start date for each lot in your account.

Strategy 1: Set up your 10b5-1 plan during the lockup

A Rule 10b5-1 trading plan is a pre-scheduled sell program that lets you sell company stock on a fixed schedule — removing you from insider-trading liability because the trade decisions were made in advance, when you had no material non-public information.

Key: you can adopt a 10b5-1 plan while you are still locked up. The plan can specify that first trades begin only after the lockup expires. This lets the mandatory cooling-off period run concurrently with the lockup, not sequentially after it.

Post-2023 SEC amendments require:³

• 90-day cooling-off period between plan adoption and first trade, for most employees
• 4-month cooling-off period for Section 16 officers (directors, executives, 10%+ shareholders) — typically the longer of 4 months or 90 days, capped at 120 days

If your lockup is 180 days and you adopt a 10b5-1 plan at 90 days post-IPO, the 90-day cooling-off runs concurrent with the remaining 90 days of lockup. First trade: IPO day + 180 days (lockup expiration). No dead time.

A well-structured plan can specify: a start date at or after the 12-month LTCG mark, a price floor below which you won't sell, a fixed number or percentage of shares per month, and a total duration (12–36 months is common for large positions).

Full guide: 10b5-1 Trading Plans: Who Needs One and How to Set It Up.

Strategy 2: Spread sales across multiple tax years

Selling a large position in a single year concentrates all the gain in your highest bracket and maximizes NIIT exposure. Spreading over 2–4 years can meaningfully reduce total tax — especially if your RSU vesting schedule varies, your income fluctuates, or you expect your marginal rate to change.

The bigger benefit of multi-year selling is flexibility: you can pair gains with tax-loss harvesting from a direct-indexing account, coordinate with a spouse's income changes, or time sales around large deductions (charitable gifts, depreciation recapture, big AGI-reducing contributions).

Model your sell-down schedule: Concentrated Stock Diversification Calculator.

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

If you have charitable intent — even future intent, like "I'll give to charity at some point" — donating appreciated IPO stock directly to a donor-advised fund is one of the most tax-efficient moves available.

What happens: you transfer shares to the DAF. The DAF sells them with no capital gains tax. You receive a charitable deduction for the full fair-market value of the shares on the date of transfer. You recommend grants from the DAF to charities over time (or immediately).

• Deduction limit: 30% of AGI per year for appreciated capital gain property donated to a public charity or DAF, with a 5-year carryforward.⁴
• 2026 OBBBA note: Itemized charitable deductions in 2026 are limited to amounts exceeding 0.5% of AGI, and the maximum federal rate at which the deduction saves tax is 35% (not the full 37%). For a $500K gift with $1M AGI: floor = $5,000; net deduction = $495,000 × 35% = $173,250 federal savings — plus state savings where applicable.
• No capital gains tax: Donating appreciated shares avoids all capital gains tax on the appreciation, as long as you've held the shares more than one year (LTCG property).

See all concentration strategies: Diversifying Concentrated Employer Stock.

Strategy 4: State residency timing

California taxes capital gains as ordinary income — no LTCG preference — at rates up to 13.3%. That's an addition to 23.8% federal LTCG + NIIT, for a combined 37.1% rate. For a $2M gain, the CA state component alone is ~$266K.

Relocating to a state with no income tax (Texas, Florida, Nevada) or a lower-rate state before the tax year in which you realize your largest gains can eliminate or reduce that component. Washington state now has a graduated capital gains tax — 7% on gains above $262,000 and 9% on gains above $1 million (effective 2025)⁵ — so it's a partial reduction vs. California, not a full escape for large positions.

California's Franchise Tax Board scrutinizes high-income residency changes. The test is domicile — where you intend to make your permanent home — not a day count. Key factors: where your primary residence is located, where your family lives, date you sold or ended your CA lease, where you vote and maintain financial accounts. A tax attorney should review any residency change made within 12 months of a large liquidity event.

Strategy 5: Recover ISO AMT credits in a large sale year

If you hold incentive stock options (ISOs) and paid Alternative Minimum Tax in a prior year when you exercised them, you have AMT credit carryforwards that reduce your regular tax in years where regular tax exceeds your tentative minimum tax.

A year in which you realize large LTCG income is often a year when regular tax spikes well above your AMT — which means your carryforward credit becomes usable. Pairing a large stock sale with ISO exercise modeling can sometimes accelerate years of accumulated AMT credit into a single recovery year.

Model your ISO AMT exposure: ISO AMT Calculator.

Decision framework