An acqui-hire — when a buyer buys a startup mainly to hire its team — often increases tax on founder stock. Any amount paid for staying and working after closing is taxed as ordinary wages, not capital gain.
Founders often receive a mix of stock-sale proceeds, retention bonuses, earnouts, and new buyer awards. The label in the deal papers does not control the tax result. Substance and work requirements do.
Table of Contents
- Why does deal money become wage income?
- What happens to unvested founder shares?
- How are options and RSUs taxed in the sale?
- Why do early sales lose special stock breaks?
Why does deal money become wage income?
According to Promise Legal, an acqui-hire divides payouts between stock-purchase consideration and retention or employment pay Promise Legal guide to acqui-hire issues. Promise Legal notes that amounts for post-closing services are taxed as ordinary wages subject to payroll taxes. A stay bonus or salary bump tied to continued work falls on the wage side.
According to Alegria Advisors, an earnout forfeited if the founder leaves is treated as compensation Alegria Advisors earnout tax reminder. The firm says reviewers look at employment conditions, pay size versus normal pay, and separation of deal and employment terms. A large earnout plus a below-market salary raises risk.
- Treat forfeitable earnouts as likely wages when planning cash flow.
- Compare retention pay with the local market salary for the buyer role.
- Keep purchase terms apart from offer letters and vesting schedules.
What happens to unvested founder shares?
According to Davis Wright Tremaine, founder restricted stock without a timely Section 83(b) election is taxed at vesting. The tax base is fair market value minus amount paid, as ordinary compensation subject to income and employment tax. That rule hits founders who took restricted stock at formation and never filed.
The IRS explains that a Section 83(b) election must be filed within 30 days after transfer. It taxes unvested stock at grant value and starts the capital-gain and QSBS clocks. The election is unavailable for RSUs.
How are options and RSUs taxed in the sale?
The IRS states that RSUs are not Section 83 property at grant, so no 83(b) election is allowed. The share value at vesting or settlement is taxed as ordinary income. A cash-out of unvested RSUs at closing is therefore wage-like income.
The IRS states that ISO shares need sale after both one year from exercise and two years from grant for qualifying capital-gain treatment IRS guidance on employee stock options. The IRS treats an earlier acqui-hire sale as a disqualifying disposition. The exercise spread is then taxed as ordinary W-2 wages. Founders who exercise shortly before the deal often fail both clocks.
Why do early sales lose special stock breaks?
The IRS Publication 550 for 2025 states that Qualified Small Business Stock under Section 1202 requires C-corporation original issuance. It also requires over five years' holding. Stock acquired after Sept. 27, 2010 can qualify for up to 100 percent federal gain exclusion. A two- or three-year-old startup sold in an acqui-hire rarely meets the holding test.
Entity history also matters, because non-C-corporation stock does not qualify. Stripe notes that an early acqui-hire sale generally destroys full QSBS and ISO holding periods. Accelerated vesting, cash-outs, and buyer rollover awards create immediate ordinary income. Section 1045 rollover may defer pre-five-year QSBS gain. Founders should map each dollar before signing into stock sale, wage payment, or rollover award. Ask a tax adviser to test QSBS, ISO, 83(b), and payroll exposure on that map.