State Tax on Pre-IPO Secondary Sales

A senior IC at a late-stage private company receives a tender offer to sell vested RSU shares. The company is offering $280 per share, the employee has 4,000 vested shares at an RSU grant value of $60, producing $880K of gain. Which state taxes this gain?

Generally the state of residence at the time of sale. That’s the default rule for capital gains on the sale of stock. For pre-IPO secondary sales, the state tax depends on where the seller lives when the tender closes and the proceeds settle.

But there are complications. If the shares came from vested RSUs, the ordinary-income portion (W-2 at vest) was already sourced elsewhere. Only the post-vest appreciation is capital gain. For ISOs, similar split applies.

The basic rule: residence at sale

Capital gains on intangible property (stock) are generally sourced to the seller’s state of residence. This is the default rule in most states and is consistent with how federal tax treats it.

For a California resident selling pre-IPO shares via tender: California taxes the full gain at California rates. For a Texas resident selling the same shares: no state tax.

The rule has one important corollary: move before the sale if relocating to a no-tax state is an option. Selling as California resident, then moving to Texas a month later, doesn’t save California tax. You must be a Texas resident on the date of sale.

The RSU split: already-sourced vs capital

For RSUs vested in California:

At vest. Income is W-2 ordinary income, fully taxed by California at ordinary rates.

Post-vest appreciation. Capital gain from vest FMV to sale price, sourced to residence at sale.

Example: RSU vested at $60 in 2023 while California-resident. Taxpayer moved to Texas in 2024. Sells at $280 in 2025 secondary offer.

• Vest income $60: already sourced to California in 2023
• Sale at $280: $220 per share capital gain
• State of residence at sale: Texas
• Texas tax: $0

This is how residency-change planning saves state tax on the capital gain component. The ordinary income at vest can’t be un-sourced, but the subsequent appreciation can be.

Ordinary income vs capital gain distinction

For pre-IPO RSUs with double-trigger vesting:

• First trigger: time-based vest (pre-IPO, no tax for double-trigger)
• Second trigger: liquidity event (typically IPO, but tender offer can also trigger)
• At second trigger: ordinary income equal to FMV at trigger

If the tender offer triggers the liquidity trigger, ordinary income is recognized at tender price. The entire $280 is W-2 ordinary income, sourced to workdays during the grant-to-trigger period.

This matters for residency planning: if the tender offer is the liquidity trigger, all $280 per share is ordinary income, not capital gain. Workday allocation applies, and California trailing nexus can claim the California-worked portion.

Tender offer vs open secondary

Pre-IPO secondary markets include:

Company-sponsored tender offers. Formal offer from company or investor to buy shares at set price. Often happens periodically at late-stage companies (Series E+). Tax treatment depends on whether it’s the first liquidity trigger.

Open secondaries via platforms. Brokers like Forge, EquityZen, Hiive, and others facilitate secondary transactions. Employee sells to accredited investor. Tax treatment is capital gain on vested shares if vest has already occurred.

Direct negotiated secondary. Employee sells to specific investor outside formal platforms. Capital gain treatment similar to open secondary.

For tax purposes, the key question is whether the sale triggers the second-trigger of a double-trigger RSU. If yes, the sale proceeds are ordinary income plus capital gain (if any spread between vest FMV and sale price). If no (share was already single-trigger vested, or this is ISO or pre-RSU early-exercise stock), the sale is pure capital gain.

Federal §1202 QSBS interaction

If the pre-IPO company qualifies as a Qualified Small Business Corporation under IRC §1202, gains on qualified small business stock held 5+ years can be fully or partially excluded from federal tax:

• Up to $10M or 10x basis, whichever is greater
• Federal exclusion only; state treatment varies

California does not exclude QSBS from state tax. New York excludes up to the federal exclusion amount. Other states vary.

For a California resident with $5M of QSBS gain in a secondary sale:

• Federal: $5M excluded under §1202 (assuming all qualifying)
• California: $5M fully taxable at 13.3% = $665K CA tax

Moving to a no-tax state before the sale would save the $665K.

Workday allocation on post-IPO double-trigger vests

For pre-IPO RSUs that haven’t hit the second trigger yet, when the IPO fires:

• Ordinary income at IPO = FMV at IPO × all vested RSUs
• Sourced to workdays during grant-to-IPO period
• California trailing nexus can apply to California-worked portion

For a tender offer that triggers the second trigger:

• Similar ordinary income at tender
• Workday allocation over grant-to-tender period

Planning sequence for pre-move sellers

If relocating to no-tax state before expected secondary sale:

1. Move well before the scheduled tender or liquidity event (6-12 months ideal)
2. Establish clean domicile in new state
3. Participate in the tender as resident of new state
4. File non-resident return in former state for W-2 income and trailing-nexus items
5. File resident return in new state (no income tax states have simpler returns or none)
6. Maintain workday records for state sourcing disputes

Documentation for the state of residence claim

For a sale claiming non-California state of residence:

• Date of move with supporting documents
• Evidence of domicile in new state
• Date of sale (tender close, settlement)
• Evidence that taxpayer was physically present in new state around sale date
• Pre-move and post-move evidence of residence

California will likely send a Residency Questionnaire for any high-dollar tender seller who claims non-CA residence.

Frequently asked

Does selling through a secondary platform trigger the second trigger of double-trigger RSUs? Not necessarily. The company’s plan document defines the second trigger. Tender offers sponsored by the company often do. Third-party secondaries (Forge, EquityZen, Hiive) typically don’t unless the company explicitly recognizes them as triggering events.

What if I hold ISO stock and sell pre-IPO? ISO exercises require qualifying holding periods (2 years from grant, 1 year from exercise) for qualifying disposition. Pre-IPO sale often violates these if options were exercised recently. The disqualifying disposition converts spread-at-exercise to ordinary income (workday-allocated) and any additional gain to capital gain (residence-at-sale).

Does §6501 statute apply? Federal 3-year from filing for IRS audits. States vary: CA 4 years, NY 3-6 years. Keep tender offer and sale documentation 7+ years.

What about NIIT on the secondary sale? Federal 3.8% NIIT applies to investment income over thresholds regardless of state. It doesn’t affect state sourcing.

Does the sale affect IRMAA for retirees? Yes. Secondary sale gains count toward MAGI, feeding IRMAA two years later. A large tender sale at 63 could push top-tier IRMAA at 65. Plan the sale to account for Medicare surcharge impacts.