Pre-IPO Tender Offers: Tax Treatment and Lock-Up

What a pre-IPO tender offer actually is

A tender offer is a company-organized liquidity event where employees can sell vested shares at a stated price per share — typically the latest 409A fair market value or the price paid by an incoming investor in the current funding round. The company controls every parameter: who is eligible, how many shares each person can sell, the price, and the window (usually 10–20 business days).

This is not the same as selling on a secondary marketplace (Forge, EquityZen, Carta CartaX). Secondary sales are employee-initiated, often at a discount to the last round price, and may violate your company’s ROFR clause. Tender offers are company-blessed — the board has approved the transaction, the price is set, and the transfer restrictions are temporarily waived for participating employees.

Why companies do this: retention. Private companies are staying private longer — median time to IPO is now 11+ years for VC-backed tech companies. Employees who joined at Series A are sitting on paper wealth they cannot touch. Tender offers let the company release pressure without going public, keeping key employees from jumping to a company that can offer public-market liquidity.

The tax treatment depends entirely on your grant type

The single biggest variable in your tender offer tax outcome is the type of equity you hold. The same $400K tender sale produces wildly different after-tax proceeds depending on whether you are selling shares from exercised ISOs, exercised NSOs, or vested RSUs that were settled in private stock.

NSO shares sold in a tender offer

Non-qualified stock options (NSOs) are the simplest case. At exercise, you already paid ordinary income tax on the bargain element (FMV at exercise minus strike price). Your cost basis in the shares equals the FMV on the exercise date. When you sell in the tender:

• Held >12 months post-exercise: gain from basis to tender price is long-term capital gains (0%/15%/20% depending on income, plus 3.8% NIIT if MAGI exceeds $200K single / $250K MFJ)
• Held ≤12 months post-exercise: gain is short-term capital gains, taxed as ordinary income (up to 37% + 3.8% NIIT)

The effective top federal rate difference: 23.8% (LTCG + NIIT) vs. 40.8% (ordinary + NIIT). On $400K of gain, that is a $68,000 difference in federal tax alone. This is why exercise timing relative to a tender offer matters enormously.

ISO shares sold in a tender offer (IRC § 422)

ISOs have two holding-period requirements for qualifying disposition treatment under IRC § 422:

1. At least 2 years from grant date
2. At least 1 year from exercise date

If both are met, the entire spread from strike price to tender price is taxed as long-term capital gains. If either fails, it is a disqualifying disposition:

• The bargain element at exercise (FMV at exercise minus strike) is reclassified as ordinary income on your W-2
• Any additional appreciation above exercise-date FMV is capital gains (long or short-term depending on how long you held post-exercise)

The AMT complication: when you exercise ISOs and hold (which you must, to meet the 1-year holding period), the bargain element is an AMT preference item in the year of exercise. You may owe AMT on phantom income you have not yet realized. If you then sell in a tender offer in a later year, you get an AMT credit carryforward — but the cash outlay for AMT happens first.

RSU shares sold in a tender offer

RSUs at private companies work differently from public-company RSUs. At vest, you recognize ordinary income on the FMV of the shares (reported on your W-2). Your cost basis equals the vest-date FMV. If you are still holding those shares when the tender offer arrives:

• Tender price > vest-date FMV: the difference is capital gains (long or short-term based on holding period from vest date)
• Tender price < vest-date FMV: you have a capital loss — you paid tax at vest on a higher value than you are now realizing

The loss scenario is more common than people expect at private companies. If the 409A valuation at vest was $30/share but the tender offer is at $25/share (because the market environment shifted), you have a $5/share capital loss — and you already paid ordinary income tax on the $30/share FMV at vest. This is one of the sharpest edges of private-company RSU taxation.

Compensatory vs. non-compensatory classification

Here is a nuance the top-3 Google results largely skip: the IRS distinguishes between compensatory and non-compensatory tender offer transactions. The classification determines whether the tender price in excess of FMV is treated as ordinary income (compensation) or capital gains.

• Compensatory: if the company is paying above FMV specifically to retain you (effectively a bonus disguised as a share buyback), the premium may be reclassified as ordinary income under IRC § 83. This triggers W-2 reporting and employer payroll taxes.
• Non-compensatory: if the tender price reflects genuine market value (e.g., the latest round price), and the sale is to a third-party buyer (not back to the company as retention), it is typically treated as a capital transaction.

Most institutional tender offers (Nasdaq Private Market, Forge-facilitated, etc.) are structured as non-compensatory. But company-direct buybacks at premium prices can trigger compensatory treatment. Read the tender offer documents — specifically the section on “tax treatment” or “Section 83 analysis” — before assuming capital gains treatment.

Lock-up restrictions: what limits your participation

Tender offers come with restrictions that reduce how much liquidity you can actually extract. These are not tax rules — they are contractual limitations in your equity agreement and the tender offer terms:

The post-tender IPO lock-up is the one most people miss. Some tender agreements include a clause that extends your standard 180-day IPO lock-up if you participated in a tender within 6–12 months before the IPO. This means you sell a small allocation in the tender at $40/share, the company IPOs at $80/share three months later, and you are locked out of selling your remaining shares for an additional 90–180 days beyond the standard lock-up. Read the “market standoff” section of the tender docs carefully.

Worked example: Series D engineer, $400K tender sale

Priya is a senior engineer at a Series D fintech startup in Austin. She joined 4 years ago and was granted 40,000 ISOs with a $2 strike price. The current 409A FMV is $40/share. The company opens a tender offer at $40/share, with a 25% allocation cap.

• Shares eligible to sell: 40,000 × 25% = 10,000 shares
• Tender proceeds: 10,000 × $40 = $400,000
• Strike price paid at exercise: 10,000 × $2 = $20,000
• Total gain: $400,000 − $20,000 = $380,000

Scenario A: qualifying disposition (held 2+ years from grant, 1+ year from exercise)

Priya exercised 18 months ago (grant was 4 years ago). Both ISO holding periods are met. The entire $380,000 gain is long-term capital gains:

• Federal LTCG at 15% (her taxable income with the gain falls between $48,351–$533,400 single): $380,000 × 15% = $57,000
• NIIT at 3.8% (MAGI well above $200K): $380,000 × 3.8% = $14,440
• Texas state tax: $0 (no state income tax)
• Total tax: ~$71,440
• Net proceeds: ~$308,560

Scenario B: disqualifying disposition (exercised 8 months ago)

Priya exercised only 8 months before the tender. The 1-year holding period from exercise is not met. This is a disqualifying disposition:

• Bargain element at exercise: ($40 FMV − $2 strike) × 10,000 = $380,000 → ordinary income (reported on W-2)
• Additional gain above exercise-date FMV: $0 (tender price equals exercise-date FMV)
• Federal ordinary income tax at 35% bracket (her income including $180K salary + $380K gain): $380,000 × 35% = $133,000
• FICA: Social Security capped at $181,800 wage base (already exceeded by salary); Medicare 1.45% + 0.9% additional: $380,000 × 2.35% = $8,930
• Texas state: $0
• Total tax: ~$141,930
• Net proceeds: ~$238,070

The holding-period difference: $70,000

Same shares, same tender price, same person. The only difference is whether Priya exercised early enough to meet the ISO holding-period requirements. Scenario A nets her $70,490 more than Scenario B. This is why exercise timing relative to anticipated tender offers is a six-figure planning decision.

The catch: exercising early means paying cash out of pocket ($20,000 in strike price) and triggering AMT in the exercise year. The bargain element of $380,000 is an AMT preference item under IRC § 422. At a 28% AMT rate, that is potentially $106,400 in AMT exposure in the exercise year — a bill you pay before the tender offer gives you any liquidity. This is the ISO exercise timing trap: you need cash to exercise, you owe AMT immediately, and the tender offer (your liquidity event) may be 12+ months away.

The 83(b) election angle for early exercises

Under IRC § 83(b), employees who receive restricted property can elect to recognize income at grant (or early exercise) rather than at vesting. For pre-IPO employees who early-exercise unvested options, the 83(b) election:

• Starts the ISO holding-period clock immediately (from grant date, not exercise date)
• Limits ordinary income recognition to the spread at the time of exercise (often $0 if exercised at grant when strike = FMV)
• Converts all future appreciation to capital gains
• Must be filed with the IRS within 30 days of the restricted stock transfer — no exceptions, no extensions

For employees who join very early (Series A/B) and exercise immediately at a low FMV, the 83(b) election is the single most valuable tax planning move available. By the time a tender offer arrives 3–4 years later, both ISO holding periods are long satisfied, and the entire gain from $2 strike to $40 tender price is long-term capital gains.

The risk: if you leave the company or the stock becomes worthless, you paid tax (however minimal) on shares you no longer own — and you cannot recover that tax. The 83(b) election is irrevocable once filed.

QSBS § 1202: the exclusion that can eliminate the federal bill entirely

If your company is a qualifying small business (domestic C-corp, gross assets under $50M at issuance, active business requirement), gains from selling QSBS held 5+ years are excluded from federal tax entirely — up to the greater of $10M or 10× basis per taxpayer. The exclusion is 100% for shares acquired after September 27, 2010.

For Priya’s scenario: if her company is a qualifying C-corp, her shares were acquired at exercise (basis = $20,000), and she has held them 5+ years, the entire $380,000 gain could be excluded from federal income tax — no LTCG, no NIIT, no AMT preference. Her federal bill drops to $0.

The catches:

• 5-year hold required: the clock starts at exercise (or purchase), not at grant
• C-corp only: most startups are Delaware C-corps, but verify
• $50M gross asset test: applies at the time of stock issuance, not at sale
• State non-conformity: California, New Jersey, Pennsylvania, Mississippi, and Alabama do NOT conform to § 1202. A CA-resident selling QSBS still owes state tax at 13.3% on the full gain

QSBS qualification is the most underused tax planning tool for pre-IPO employees. If your company qualifies and you have held shares for 5+ years, the tender offer proceeds can be nearly tax-free at the federal level. Confirm qualification with a tax professional who specializes in startup equity — the “active business” and “gross asset” tests have specific requirements that not all tech companies meet (holding companies, financial services, and real estate are excluded).

The sell-vs-hold decision framework

I think most employees at late-stage pre-IPO companies should participate in tender offers when available — at least partially. Here is the reasoning:

• Concentration risk is the largest controllable risk in your portfolio. If your company stock represents more than 25% of your liquid net worth, you are over-concentrated. A tender offer is a controlled opportunity to diversify without the signaling risk of secondary-market sales.
• Private-company outcomes are binary. The IPO may happen in 6 months or 3 years. The company could get acquired at a lower valuation. It could fail. Partial liquidity removes some of the binary-outcome risk.
• The tax cost of selling is known; the opportunity cost of holding is not. You can calculate your exact tax liability on a tender sale. You cannot calculate the probability-weighted expected value of holding.

Where holding makes sense: (1) you strongly believe the IPO valuation will be materially higher than the tender price, (2) your company stock is a small percentage of your net worth, (3) you are within months of meeting a QSBS 5-year hold or ISO qualifying-disposition threshold that would materially reduce your tax bill, or (4) the tender allocation is so small relative to your total position that the liquidity is not meaningful.

The 90-day post-termination ISO exercise window

One scenario that intersects with tender offers: if you leave the company (voluntarily or through layoff), your unexercised ISOs typically expire 90 days after termination under IRC § 422. After 90 days, unexercised ISOs convert to NSOs — losing their favorable tax treatment permanently.

If a tender offer is announced shortly after you leave, you may need to exercise your ISOs within that 90-day window to participate. This creates a cash crunch: you need the exercise capital (strike price × shares) before the tender provides liquidity. Some companies offer extended exercise windows (up to 10 years post-termination), which preserves ISO status only for 90 days but allows NSO exercise for years. Check your option agreement for the specific post-termination exercise period.

Tax planning checklist before participating

1. Identify your grant type: ISO, NSO, RSU, or restricted stock with 83(b). Each has different tax treatment in a tender.
2. Check holding periods: for ISOs, confirm whether you meet the 2-year/1-year qualifying disposition thresholds. For all grant types, confirm whether you meet the 12-month LTCG threshold.
3. Assess QSBS eligibility: is the company a qualifying C-corp? Were gross assets under $50M when your shares were issued? Have you held 5+ years from exercise?
4. Read the tender documents: look for compensatory vs. non-compensatory classification, allocation caps, post-tender lock-up extensions, and ROFR clauses.
5. Model the tax bill: calculate federal (LTCG or ordinary), NIIT (3.8% above $200K/$250K MAGI), and state tax. Compare net proceeds across grant types and holding scenarios.
6. Plan for no withholding: tender offer proceeds from selling shares (not RSU vests) typically have no tax withheld at source. You will owe the full amount at filing or through quarterly estimated payments.
7. Consider concentration post-tender: after selling 10–25% allocation, what percentage of your net worth is still in company stock? Plan the next diversification step.

Key takeaways

• Pre-IPO tender offers provide company-sanctioned liquidity, but your tax outcome depends on grant type (ISO/NSO/RSU), holding period, and whether the transaction is compensatory or non-compensatory under IRC § 83.
• ISOs sold in a qualifying disposition (2+ years from grant, 1+ year from exercise) qualify for 100% LTCG treatment. A disqualifying disposition converts the bargain element to ordinary income — a potential $70,000+ difference on a $400K sale.
• QSBS § 1202 can exclude up to $10M of gain from federal tax entirely if you hold qualifying C-corp stock for 5+ years. Seven states (including California) do not conform.
• Lock-up restrictions — especially post-tender IPO lock-up extensions and pro-rata allocation scaling — limit how much liquidity you can actually extract. Read the tender documents, not just the headline price.
• There is typically no withholding on tender offer proceeds from share sales. Plan for the full tax bill through quarterly estimated payments (Form 1040-ES) or W-4 adjustments on your regular paycheck.
• The 83(b) election, filed within 30 days of early exercise, is the most valuable pre-tender tax move available — it starts holding-period clocks at minimal cost and converts all future appreciation to capital gains.