Key Takeaways
- Startup equity can become life-changing wealth after an IPO, but the central planning challenge is converting concentrated company stock into durable, diversified, after-tax wealth.
- Equity may create ordinary income, capital gains, AMT exposure, and withholding gaps depending on whether you hold RSUs, ISOs, NSOs, or a combination.
- For most late-stage private companies, double-trigger RSUs are taxed at the IPO, not at time-based vesting, which can drop a large slug of ordinary income into a single year, often under-withheld.
- The IPO creates liquidity, but the lockup period creates a planning window before major selling decisions begin.
- Tax-aware investment strategies, including TALS™, may help certain investors prepare for the tax cost of future diversification before it occurs.
An employee who joined a high-growth startup several years ago may now be looking at a very different financial life. Equity that once felt speculative may be worth several million dollars on paper. The company has filed to go public. Coworkers are comparing notes. The lockup expiration date has become one of the most important dates on the calendar.
One question that’s always front of mind in this scenario is: how much tax will I owe?
That question matters. RSUs, ISOs, and NSOs are taxed differently, and the rules can produce very different outcomes depending on vesting, exercise timing, holding periods, and eventual sale. The IRS explains in Topic 427 that statutory stock options, including incentive stock options, may produce capital gain or ordinary income depending on whether holding-period requirements are met, while nonstatutory options generally produce ordinary income when exercised.
The more valuable planning question is broader: how do you convert concentrated startup equity into diversified, tax-efficient wealth?
Why Many Employees Underestimate Their IPO Tax Bill
At many late-stage private companies, RSUs carry a double trigger. The first trigger is time-based vesting. The second is a liquidity event such as an IPO. Both have to occur before the shares are taxable, which means RSUs that have satisfied the time-based vesting requirement can all become taxable in the same year the company goes public.
The result is a large block of ordinary income recognized at once, reported on your W-2. Employers withhold on supplemental wages like this at a flat 22% on the first $1 million in a calendar year, and 37% on anything above that. For a multi-million-dollar block of RSU income, the blended withholding rate often still lands below the marginal rate the income actually pushes you into. The gap between what was withheld and what is due can be substantial, and it comes due the following April.
There is a second trap in the timing. The tax is owed when the shares vest at the IPO, based on the fair market value at vest, but the shares are usually locked up for about six months afterward. That produces a large tax bill on stock you cannot yet sell. If the price falls during the lockup, the problem grows, because you are taxed on the higher IPO-day value while holding shares now worth less. Paper wealth and spendable wealth are not the same number, and the tax is calculated on the paper number. Planning before liquidity means deciding in advance how that bill will be funded, whether from withholding, set-aside cash, or an early sell window if the company permits one.
Understand What Your Tax Exposure Could Look Like
A $5 million equity position is a pre-tax number. The amount that becomes investable wealth you can use to fulfil your financial goals depends on federal tax, state tax, payroll tax, AMT exposure, capital gains, withholding, and the timing of sales.
RSUs generally create ordinary income when they vest, or for double-trigger grants, when the IPO clears. NSOs generally create ordinary income when exercised, measured by the difference between fair market value and the exercise price. ISOs can receive long-term capital gains treatment when holding-period requirements are satisfied, but the spread at exercise can create AMT exposure. IRS Form 6251 is used to calculate AMT, and ISO exercises are a common reason employees need to model AMT before deciding whether and when to exercise. The mechanics of each option type are detailed in IRS Publication 525.
For employees approaching an IPO, the practical issue is timing. Taxes may be triggered before a full diversification strategy is in place. Shares may be locked up. Market value may move materially before employees can sell. That is what makes pre-liquidity planning essential.
The objective is to establish a realistic after-tax range before shares become tradable. That range should guide how much stock to sell, how much to retain, how much cash to reserve for taxes, and how to reinvest proceeds.
Diversification Is the Central Wealth Management Challenge After an IPO
Concentration often creates startup wealth. Employees spend years optimizing for maximum exposure to one company. Every promotion, every refresher grant, and every decision to hold rather than sell increases that exposure. By the time you arrive at the IPO, the vast majority of your wealth may be in employer stock.
The IPO marks a shift in objective. The challenge is no longer maximizing exposure to a single company: it’s about taking some chips off the table in a tax-efficient manner. Your goal should be to build a portfolio capable of supporting decades of future spending, investing, philanthropy, and family goals.
Diversification becomes the central planning issue, and taxes make the decision harder. Selling appreciated shares may trigger significant capital gains. Holding avoids the immediate tax bill but preserves company-specific risk. The largest tax bill associated with startup equity often arrives during diversification, not during wealth creation. The right approach usually involves a coordinated sell-down plan rather than a single decision at lockup expiration. We cover this broader principle in our discussion of tax-aware investing in practice and how it applies to concentrated stock positions.
This is where many employees need more than tax preparation. They need a transition plan from concentrated equity to a diversified portfolio built around after-tax wealth.
Build a Tax Strategy Before Liquidity Arrives
Most employees begin thinking about tax strategy after they can sell. The better planning window often opens before shares become tradable.
At True Wealth Design, we focus on after-tax outcomes because pre-tax wealth and spendable wealth are different numbers. For employees with substantial startup equity, the future tax problem is often visible well before the taxable event occurs. That visibility creates an opportunity.
If an employee expects to sell appreciated shares after lockup, future capital gains are likely. Most investors treat that gain as a fixed cost they pay when the time comes. A different approach asks a question earlier: if a large gain is coming, can anything be done in advance to reduce the cost?
This is the idea of building tax assets. A tax asset is a realized loss or other tax attribute that can offset a future gain. Traditional tax-loss harvesting is the familiar version, and it can help in some situations, but its benefit is limited by market conditions and the supply of available losses in an ordinary portfolio. When a multi-million-dollar gain is on the horizon, incidental losses rarely move the needle. The more deliberate approach is to build tax assets intentionally, ahead of the gain, so the offsets exist when diversification begins.
Plan for the Tax Before the Gain Arrives
That principle is the core of pre-liquidity planning. Once an employee accepts that the gain is coming, the goal shifts from reacting to it to preparing for it.
Tax-Aware Long-Short Investment & Tax Strategies (TALS™) is one way to pursue that goal for investors who qualify. The problem with an ordinary portfolio is that you cannot manufacture losses on demand. When the market rises, most positions rise with it, and there is little to harvest precisely when you need offsets for a large gain. A long-short structure changes that. It holds hundreds of stocks long and hundreds short, so in almost any market some positions are down and can be sold to realize losses, while the portfolio keeps its intended market exposure. You are not betting on the market falling. You are harvesting the dispersion that always exists inside a large book of stocks, and converting it into tax assets.
Those tax assets are the point. Realized losses generated this way may help offset the capital gains created when you diversify out of concentrated company stock, or other taxable events in the same window. For an investor planning on selling millions of dollars in stock to diversify, that is the difference between paying tax on the full gain and paying tax on the gain net of losses built ahead of time. TALS™ involves investment risk and costs, and it is not suitable for everyone. Our article on the key to tax-aware investing explains how these strategies fit into a broader plan, and our comparison of long-short equity strategies covers how the tax-aware version differs from traditional funds.
Hypothetical Example: The San Francisco Software Engineer
Consider an engineer who joined a leading AI lab in 2022. Through option grants and equity appreciation, their company equity is now worth roughly $5 million. Their other assets total $800,000, so company stock represents about 86% of net worth. The lockup is expected to expire six months after the IPO, and the plan is to sell roughly $2 million over the first two years to bring the position down to a manageable share of the portfolio.
A reactive approach begins at lockup expiration. The engineer watches the market price, asks how much tax is owed, and decides how many shares to sell. The first $1 million of sales carries a large capital gain, the tax bill feels steep, and they pull back, selling less than planned. A year later the position still dominates the balance sheet, the next sale creates another taxable event, and the concentration risk they meant to reduce is still there.
A proactive approach begins before liquidity. The engineer models several after-tax outcomes on that $2 million sell-down, sets a target for reducing company stock exposure, reserves cash for the RSU income tax that lands at IPO, and evaluates whether TALS™ or other tax-aware strategies may help offset the capital gains the sales will generate. When shares become tradable, the first sale is one move inside a broader plan rather than the plan itself.
The difference is control. In both cases, the employee may owe tax. But the proactive scenario builds in a coordinated approach to taxes, diversification, investment management, and long-term goals before the first major sale. The IPO creates liquidity. Diversification determines how much of that liquidity ultimately becomes lasting wealth.
Taking the Next Step On Your Wealth Building Journey
The IPO is a milestone. The larger financial transition happens afterward.
Years of concentrated startup equity may create the wealth, but the next phase requires converting that wealth into a diversified, tax-efficient portfolio that can support financial independence, family goals, future career flexibility, and long-term security.
The months before shares become tradable are valuable. Tax exposure can be estimated. Diversification targets can be set. Future gains can be anticipated. Tax-aware investment strategies can be evaluated.
For employees with substantial startup equity, planning before liquidity may materially improve the quality of decisions after liquidity.
If your company is approaching an IPO or liquidity event, contact a True Wealth Design professional to evaluate your equity, tax exposure, diversification strategy, and whether TALS™ or other tax-aware investment strategies may fit your situation.
This article is for educational purposes only. The strategies referenced apply to Accredited Investors or Qualified Purchasers per SEC regulations.
