Founder liquidity planning

A startup tender offer gives you a window to sell. The hard part is deciding how much — and what to do before the window opens.

A tender offer is a structured, time-limited opportunity to sell a portion of your private company stock. For many founders, it's the first chance to convert years of paper value into real liquidity. But unlike an IPO or acquisition where the entire company sells, a tender offer leaves most of your stock in place — which means the decisions you make in the next 20 business days live inside a position that may still represent most of your net worth.

How startup tender offers work

A private company tender offer can be organized three ways:

• Company buyback: The company uses cash — sometimes from a new financing round — to repurchase shares from existing holders at a set price.
• Investor-led: An existing or new investor offers to purchase secondary shares from employees and founders alongside or after a primary round. The company approves the transfer but isn't the buyer.
• Third-party secondary: A specialized secondary investor (institutional buyer, secondary fund) organizes a formal tender process, often at a negotiated discount to the most recent preferred round price or 409A.

In all cases, the board approves the offer and controls eligibility. Formal tender windows typically run 20 business days. You elect how many shares to tender, the buyer settles post-close, and proceeds typically arrive within a few weeks of closing.

The central founder question: how much to sell

The right percentage is personal — there is no formula. But the inputs are consistent across most founder situations.

Tax treatment of a tender offer sale

Most founder shares sold in a tender offer qualify for long-term capital gain treatment, but the tax picture has several layers worth modeling before the window opens.

Federal long-term capital gain rates (2026)

If you have held the stock more than one year, proceeds are taxed at 0%, 15%, or 20% depending on your total taxable income for the year:¹

• 0%: taxable income up to $49,450 (single) / $98,900 (married filing jointly) — rarely applicable at founder-sale scale
• 15%: taxable income between the 0% and 20% thresholds
• 20%: taxable income above $545,501 (single) / $613,701 (MFJ)

Most founders realizing material tender offer proceeds will hit the 20% bracket. Use the liquidity after-tax calculator to model net proceeds under different scenarios.

Net Investment Income Tax (NIIT)

An additional 3.8% NIIT applies to capital gain income for taxpayers with modified adjusted gross income (MAGI) above $200,000 (single) or $250,000 (MFJ).² These thresholds are statutory and not adjusted for inflation. The combined federal long-term rate for most founder-scale exits is 23.8% (20% + 3.8%).

QSBS exclusion — how it interacts with a partial sale

If your founder stock qualifies as Qualified Small Business Stock under IRC § 1202, a substantial portion of the gain may be excluded from federal income tax entirely.³ Under the One Big Beautiful Bill Act (OBBBA, enacted July 2025), for stock issued after July 4, 2025, the exclusion is tiered:

• 50% exclusion if held at least 3 years at time of sale
• 75% exclusion if held at least 4 years
• 100% exclusion if held at least 5 years
• Cap: the greater of $15 million or 10× your adjusted basis per issuer

Critically, a partial sale in a tender offer still qualifies. The exclusion is not all-or-nothing. If you sell 15% of your position in a tender, the gain on those shares can be excluded if the stock qualifies and you've passed the relevant holding threshold. The remaining 85% continues its QSBS holding period for future sales. See the full QSBS planning guide for the five eligibility tests and common disqualifiers.

One threshold to verify before assuming QSBS applies: the company's gross assets must have been $75 million or less at the time your shares were issued (and immediately after). Growth-stage companies that have raised large rounds may have already exceeded this threshold for later-issued share grants.

California and other non-conforming states

California does not conform to the federal § 1202 exclusion.⁴ Gain excluded at the federal level is still fully taxable in California at ordinary income rates — the top marginal rate is 13.3% on income above $1 million. A $5 million tender gain excluded 100% at the federal level still produces a $665,000 California state tax liability. Other non-conforming states include New Jersey, Pennsylvania, and Alabama.

If you are considering a state residency change before the sale, that plan must be completed before the tender closes — courts look at voter registration, driver's license, primary residence address, and days-in-state patterns. A move started after the window opens does not change the tax result.

Short-term holding trap for vesting tranches

Founders who did not file an 83(b) election at grant have separate holding periods for each vesting tranche. Shares that vested fewer than 12 months before the tender sale date are short-term capital gain or ordinary income — taxed at marginal rates up to 37% federal. This is the primary reason a timely 83(b) election matters: without it, the last vest cohorts may still be short-term when a tender offer arrives. See the 83(b) election guide for the full impact.

Estimated tax after the sale

A tender offer creates a large, discrete income event in a single quarter. If this pushes your 2026 income materially above what you are withholding through salary or prior estimated payments, you may face an underpayment penalty at year-end.

The safe harbor rules: paying at least 100% of your prior year's total tax liability (110% if your prior-year AGI exceeded $150,000) insulates you from the underpayment penalty regardless of what you actually owe this year.⁵ The simplest approach for a large event is an estimated tax payment in the quarter of the sale covering the expected tax on proceeds, made via IRS Direct Pay by the quarterly deadline.

Steps to take before the tender window opens

The best time to plan a tender offer is 60–90 days before the formal window. The window itself is short and under time pressure; decisions made in advance are consistently better than decisions made inside a 20-day countdown.

1. Map your current equity position. Total vested shares, unvested shares, share class, grant date, purchase price or exercise price, and per-tranche holding periods. Confirm whether an 83(b) election was filed and when.
2. Model after-tax proceeds. Use the liquidity calculator to estimate net cash under realistic scenarios: with QSBS at 3, 4, or 5 years; without QSBS; in California vs. a no-income-tax state.
3. Verify QSBS eligibility. Company counsel or a founder-specialist CPA should confirm that the company's gross assets stayed below $75 million at the time your shares were issued, that the company is a domestic C-corporation conducting an active qualifying trade or business, and that no disqualifying transfers have occurred.
4. Define your reinvestment policy. Decide in advance how tender proceeds will be invested once received. A written investment policy statement — even one page — prevents reactive allocation decisions and anchors conversations with a financial advisor.
5. Consider charitable giving. If you have charitable goals, a Donor-Advised Fund contribution timed to the same tax year as the sale can offset a portion of the taxable gain. The deduction must be made in the same tax year as the tender close.
6. Review company transfer documents. Company counsel will require representations and warranties from sellers. Review these before the window opens so you aren't signing documents you don't understand inside a 20-day deadline.

Review the complete founder liquidity checklist for the full set of planning items before any liquidity event.

Startup Founder Advisor Match is a referral service, not a law firm, broker-dealer, or registered investment adviser. We may receive compensation from professionals in our network. Content is for informational purposes only and does not constitute legal, tax, investment, securities, or individualized financial advice. Coordinate founder stock decisions with company counsel, personal counsel, CPA, board-approved processes, and other professional advisors.