What you'll learn
- RSUs vs. Stock Options: The Distinction That Confuses Almost Everyone
- Vesting Schedules and What Happens When Someone Leaves
- Tax Treatment: Where Employees Need Real Guidance, Not Just a Disclaimer
- 409A Valuations and Why Private Company Equity Value Is a Moving, Uncertain Target
- Communicating Equity Clearly: What Actually Helps Employees
Equity compensation gets handed to employees in a dense legal grant letter, explained briefly in an onboarding session alongside a dozen other topics, and then rarely revisited until something forces the question — a departure, a funding round, a tax season surprise. The gaps in employee understanding that result from this are not minor: the difference between an RSU and a stock option, what actually happens to vested equity when someone leaves, why a 409A valuation isn't the same number as the company's latest funding round headline. This guide covers the practical mechanics of RSUs and options, vesting schedules and the post-termination exercise window that catches so many departing employees off guard, the tax treatment differences that genuinely warrant professional advice, and how to communicate all of it in a way employees can actually retain and use.
RSUs vs. Stock Options: The Distinction That Confuses Almost Everyone
Quick answer
A restricted stock unit (RSU) is a promise to deliver an actual share of company stock once a vesting condition is met — typically time-based, sometimes with a performance component. RSUs have real value from the moment they vest, since they convert directly into shares (or cash-equivalent value, in some private company structures) regardless of what the stock price is doing; even if the value has dropped since grant, a vested RSU is still worth something. This is the dominant equity vehicle at public companies and later-stage private companies, largely because it's simpler to understand and doesn't carry the same downside risk that options do.
A stock option is fundamentally different: it's the right, not the obligation, to purchase a share at a fixed price (the strike price, usually set at the fair market value on the grant date) at some point in the future. An option only has value if the company's share price at the time of exercise is higher than the strike price — if the stock is trading below the strike price (a scenario often called being 'underwater'), the option is currently worth nothing, even though it's technically vested. This asymmetry — RSUs have a floor of zero but hold real value once vested, while options can be vested and simultaneously worth nothing — is the single most common source of employee confusion and disappointment.
Early-stage private companies overwhelmingly favor options because the strike price is set low (based on an early 409A valuation) and there's meaningful theoretical upside if the company's value grows substantially before exercise. As companies mature and their valuation rises, RSUs typically become more attractive to both the company and employees, since the tax and complexity burden of exercising options on an expensive stock becomes a real practical barrier. HR and compensation teams should understand which instrument the company uses and why, well enough to explain the reasoning simply to a candidate or employee who asks.
Vesting Schedules and What Happens When Someone Leaves
Quick answer
The standard vesting schedule at most companies is four years with a one-year cliff: no equity vests during the first year, then 25% vests all at once at the one-year mark, with the remainder vesting monthly or quarterly over the following three years. The cliff exists specifically to protect the company from granting meaningful equity to someone who leaves within the first year, and it's worth explaining this rationale directly to new hires, since an unexplained cliff can feel arbitrary or punitive if a new employee discovers it only when checking their equity statement.
What happens to unvested equity when someone leaves is straightforward and needs no interpretation: it's forfeited, full stop, regardless of whether the departure was voluntary or involuntary, in the vast majority of standard equity plans. What's far less straightforward, and where most confusion and disputes arise, is what happens to vested-but-unexercised stock options. This is governed by the post-termination exercise (PTE) window specified in the option grant, and it's the single most consequential detail that most employees never ask about and most companies don't proactively surface.
The traditional standard PTE window is a mere 90 days after termination — meaning an employee with years of vested options has only three months to come up with the cash to exercise them (potentially a substantial sum, plus tax implications) or lose them entirely. A growing number of companies have moved to extended windows (some as long as 7 or 10 years) specifically because a 90-day window can force departing employees into a difficult financial decision, or effectively transfer significant value back to the company when someone genuinely can't afford to exercise. If your company still uses a 90-day standard window, communicate it clearly and repeatedly, not just in a footnote of the original grant paperwork.
Most employees who receive equity grants have only a partial understanding of what they actually own — the difference between an RSU and an option, what vesting really means, and what happens to unvested equity at termination — and HR teams that leave this education to a generic offer letter clause are setting up frustration and even legal risk down the line.
Tax Treatment: Where Employees Need Real Guidance, Not Just a Disclaimer
Quick answer
Incentive stock options (ISOs) and non-qualified stock options (NSOs) have meaningfully different tax treatment, and the distinction matters enough that employees exercising a significant option grant should genuinely talk to a tax professional, not rely on generic HR guidance. ISOs can qualify for favorable long-term capital gains treatment if specific holding period requirements are met (generally two years from grant and one year from exercise), but they can also trigger alternative minimum tax (AMT) liability at the time of exercise, even before any shares are sold — a detail that has caught many employees badly off guard during past periods of stock market volatility.
NSOs are taxed as ordinary income on the difference between the strike price and fair market value at the time of exercise, with no special holding-period benefit, but they're also simpler and more predictable, without the AMT complication that ISOs carry. RSUs, when they vest, are taxed as ordinary income based on the value of the shares at vesting — most companies handle this through automatic share withholding, but employees should understand that vesting itself is a taxable event regardless of whether they sell any shares, which surprises people who assume taxes are only owed upon sale.
HR's role here is not to give individualized tax advice — that's a genuine liability risk and outside HR's expertise — but to ensure every employee receiving a meaningful equity grant gets clear, general educational material about how the instrument works, explicit encouragement to consult a tax professional before exercising or making decisions around a large vesting event, and access to whatever equity management platform the company uses so they can at least see their own vesting schedule and estimated values clearly, rather than trying to reconstruct it from grant paperwork.
409A Valuations and Why Private Company Equity Value Is a Moving, Uncertain Target
Quick answer
A 409A valuation is an independent appraisal of a private company's common stock fair market value, required by the IRS to set a defensible strike price for stock options and to avoid tax penalties for underpricing. Private companies typically refresh their 409A valuation annually or after a material event — a new funding round, a significant change in revenue or growth trajectory — and the strike price for any options granted going forward is set based on the most recent valuation. This is why option strike prices for identical roles hired six months apart at a fast-growing startup can differ significantly, and it's worth explaining this to candidates who compare offers and notice the discrepancy.
The 409A valuation is deliberately distinct from — and typically meaningfully lower than — the valuation implied by the company's most recent funding round, since the 409A specifically values common stock (what employees hold) while a funding round typically prices preferred stock (what investors hold), which carries additional protections and rights that justify a higher price. Employees who see headlines about their company's funding round valuation and try to directly translate that into what their own equity is worth are almost always working from the wrong number, and proactive communication about this gap prevents a lot of downstream confusion and disappointment.
Be transparent with candidates and employees that private company equity value is genuinely uncertain and illiquid until an exit event — an IPO or acquisition — actually occurs, and avoid language in offer conversations or internal communication that implies a specific, confident valuation outcome. Overpromising on the value of equity during recruiting is a common and serious mistake that damages trust significantly if the eventual outcome falls short of what was implied, and it's far better to be honest about the range of outcomes, including the real possibility of the equity ending up worth little or nothing, than to let optimistic assumptions go uncorrected.
Related reading
Communicating Equity Clearly: What Actually Helps Employees
Quick answer
Give every new hire receiving equity a plain-language summary alongside the formal legal grant documents — what type of equity they're receiving and why, the vesting schedule in a simple table or timeline, what the post-termination exercise window is if applicable, and where to go with questions. The formal legal documents are necessary but nearly unreadable to a non-specialist audience; a genuinely helpful onboarding process pairs them with something an employee can actually understand without a law degree.
Provide access to a real-time equity value estimate, using the current 409A valuation, through whatever cap table or equity management platform the company uses (many modern platforms build this in directly). Employees who can log in and see an estimated current value, updated as new valuations come in, feel meaningfully more informed and less anxious than employees who only have their original grant paperwork and no way to track how things have changed since.
Revisit equity education at key moments beyond the initial grant — approaching the one-year cliff, before a major vesting event, or when a new funding round changes the 409A valuation. A single onboarding conversation about equity, delivered when a new hire is absorbing dozens of other pieces of information in their first week, is unlikely to be fully retained. Spacing out education at the moments it actually becomes relevant produces much better understanding and much less confusion down the line.
The single most consequential equity detail most new hires never ask about, and most companies don't proactively explain, is the post-termination exercise window on stock options — a short window can turn years of vested equity into nothing if an employee leaves the company and can't afford to exercise in time.
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InCruiter Editorial Team
AI Hiring Research · Interview Intelligence · Enterprise Talent Strategy
The InCruiter editorial team covers AI-driven hiring, interview intelligence, and modern talent acquisition strategy. Our guides draw on platform data from 2,000+ hiring teams, conversations with talent leaders, and published research in industrial-organizational psychology.
