The Employee’s Guide to IPO Tax Planning: How to Manage Your ‘Enormous Income Year’

Employees at pre-IPO companies face a complex tax landscape that can turn a liquidity event into an unexpectedly large tax bill, depending on the type of equity they hold and the timing of their decisions [1]. Three types of equity are commonly held by employees at pre-IPO companies: restricted stock units (RSUs), incentive stock options (ISOs), and non-qualified stock options (NSOs). Each has its own tax rules, and holding a mix of them, which is common at companies like Anthropic and SpaceX, adds further complexity [1]. The venture capital model that funds these startups is built on high-growth potential and eventual exit events, such as an initial public offering, which can create sudden wealth for early employees holding equity [2]. RSUs are taxed as ordinary income at vesting, which can occur all at once on IPO day for double-trigger RSUs. "You may have an enormous income year in the year of an IPO," said Aaron Brickley, a certified financial planner with Brickley Wealth Management [1]. Employers often withhold taxes on RSUs at the time they vest, but the IRS default withholding rate is 22%, and any supplemental income above $1 million is withheld at 37% [1]. If an employee's tax bracket is higher than 22%, the default rate will not cover the full liability, requiring estimated quarterly payments to avoid a surprise bill [1]. ISOs do not trigger a taxable event until the shares are sold, but the bargain element at exercise is counted as income for the alternative minimum tax (AMT) [1]. This can create a situation where an employee owes tax on income they have not yet realized in cash. A financial planner cited in the report advises exercising ISOs up to the "equilibrium point" where regular tax equals AMT to manage this risk [1]. Lockup agreements are a significant factor in planning. These agreements prevent company insiders, including employees, from selling stock for a set period after an IPO, typically lasting six months [1]. This restriction can trap an employee with a large tax liability and no ability to sell shares to cover it, a risk that became infamous during the Enron scandal, where employees lost billions in pensions and stock value after the company's collapse and subsequent bankruptcy in December 2001 [3]. The Enron case, which was the largest corporate bankruptcy in U.S. history at the time with $63.4 billion in assets, led to the Sarbanes-Oxley Act, which increased penalties for destroying records and heightened accountability for auditing firms [3]. After any lockup period expires, the tax rate on the sale of shares depends on the holding period. Gains on stock held for more than a year after vesting are taxed at long-term capital gains rates of 0%, 15%, or 20%, depending on income [1]. Gains on stock held for less than a year are taxed as short-term capital gains at ordinary income rates, which can reach 37% [1]. State income taxes, such as those in California where all gains are taxed as ordinary income, add another layer of cost [1].