An IPO or acquisition can multiply your net worth in a single day and your tax bill along with it. The uncomfortable truth about liquidity events: almost every tax move that matters must be made before the transaction closes. Afterward, the planning window shuts and you are left managing the bill, not reducing it.

This is the checklist to work through while the event is still months away.

Why does pre-liquidity planning matter so much?

Most equity tax breaks are functions of time. QSBS needs years of holding. Capital gains need a year from vesting or exercise. Charitable deductions need the donation to happen before you have cash in hand (donating after the sale means deducting cash, not avoiding tax on appreciation). The 83(i) deferral election must be made within 30 days of vesting. None of these can be created retroactively once the deal is done and the 1099s are printed.

What should you do 12+ months before liquidity?

Confirm your QSBS position. If your company is a C corporation and your stock was issued when gross assets were under the threshold ($50 million for stock issued on or before July 4, 2025; $75 million after), check your holding period against the exclusion tiers: 50% at three years, 75% at four, 100% at five for post-July 2025 stock. If an acquisition is likely before your clock runs out, model the partial tiers rather than assuming the full exclusion. Our QSBS guide covers the full requirements.

Start long-term holding clocks early. Gains on shares held more than a year from vesting (RSUs) or exercise (options) qualify for long-term capital gains rates instead of ordinary rates. If you plan to hold post-IPO shares, the one-year clock starts at vest or exercise, not at the IPO. Exercising vested ISOs or NSOs while the company is still private starts those clocks at the lower private valuation, though you pay the exercise cost in cash and take on forfeiture risk if you leave.

Review the 83(i) deferral election. Employees of private companies can elect to defer income on RSUs and option exercises for up to five years. The election is due within 30 days after vesting, the company must not be publicly traded, and at least 80% of US employees must be granted equity under a written plan. The deferral ends early if the stock becomes transferable, the company lists its shares, five years pass, or you revoke the election. The sharp edge: your deferred income is fixed at the vest-date value, so if the stock falls before you pay the tax, you owe tax on money you never really had. This election suits employees with high conviction and cash to cover the eventual bill, not everyone (IRC Section 83(i)).

What should you do in the months before the event?

Plan charitable giving with shares, not cash. Donating appreciated shares to a donor-advised fund before liquidity gives you a deduction for the full fair market value while the appreciation escapes capital gains tax permanently. Two 2026 rules shape this: donations of long-term appreciated stock to public charities are deductible up to 30% of your adjusted gross income, and itemized charitable deductions now face a 0.5% of MAGI floor plus a 2/37 haircut that caps the benefit at 35 cents on the dollar for taxpayers in the top bracket (IRC Section 170, IRC Section 68, IRS on donor-advised funds). Bunching several years of giving into the liquidity year, when your income and deduction value are highest, usually beats spreading it out.

Map sale timing across tax years. If the transaction gives you any control over when proceeds land, splitting sales across December and January can keep gains out of your highest-bracket year. This works best when next year's income will be meaningfully lower. Our illustrated walkthrough shows the mechanics.

Check the installment sale rules. If a private acquisition pays you over multiple years, the installment method lets you recognize gain as payments arrive. But it is not available for stock traded on an established securities market, so it cannot spread the tax on post-IPO public share sales (IRS Publication 537, IRC Section 453).

How do you avoid an estimated tax disaster?

Liquidity-year income routinely breaks withholding. Employers withhold on equity payouts at flat supplemental rates (22% up to $1 million in supplemental wages, 37% above), which undershoots the real liability for anyone in the top brackets. Before year-end, project the full-year tax, compare it against the 100%/110% prior-year safe harbor, and top up with estimated payments or extra withholding so the balance due in April is a number you chose, not a surprise (IRS Publication 505).

What about state taxes?

States tax equity income under their own sourcing rules, and a liquidity event magnifies every mismatch. Some states source RSU income to where you worked during the vesting period; moving to a no-income-tax state the month before the IPO does not erase the portion earned while you lived in California. If you relocated during the vest-to-liquidity window, get the multi-state allocation done before you file, because amended returns across three states cost more than getting it right once.

Updated October 14, 2026.

This article is free educational content, not tax advice for your specific situation. If you want a plan built around your actual numbers, that is what our paid tax planning engagements do.