Comparison of Employee Equity Vehicles
Why do equity rewards exist?
Typically, a first Total Rewards professional gets hired when the equity program has already been established. It's probably a product of the compensation consultant, CFO, CEO, and the board. If you ask all of them what they were trying to solve for, you'll likely get different answers. The board was trying to add "skin in the game," align employees with shareholder outcomes (even if someone like the receptionist has zero impact on shareholder outcomes). The CEO was trying to compensate for below-market base pay and preserve cash runway. The comp consultant was trying to match the market. And the CFO was trying to make sure the company can afford it.
It doesn’t change the fact that they were all right, and none of them are thinking about it completely. And here you are trying to make sense of it and possibly explain to a management team why most employees don’t care about equity at all. Theoretically, equity does four things at once: stretches cash, creates retention through vesting, ties value to company performance, and lets you deliver above-market total comp on paper without blowing up your P&L today. No other line item in the comp structure does all four. That's why it exists. The problem is that these four objectives pull in different directions — and the vehicle you choose (options, RSUs, PSUs) determines which objectives you're actually optimizing for and which ones you're quietly sacrificing.
The Vehicles in a Nutshell
Stock options: the right to buy shares at a locked-in price. Employees make money only if the stock goes up. If it doesn't, they're holding a piece of paper that cost the company accounting expense and cost the employee nothing — except the opportunity cost of believing it was part of their comp.
RSUs: the company promises employees shares when they vest. No purchase required. Worth something as long as the company is worth something. This is the vehicle employees actually understand, which is both its strength and its limitation.
PSUs: RSUs with strings attached. Employee hits revenue target, get 100% of shares. Employee blows past it, get 150–200%. Employee misses it, get less - sometimes zero. In theory, this is the perfect alignment tool. In practice, most employees couldn't tell what metric their PSUs are tied to if asked at the coffee machine.
What They Cost the Company
Accounting
All three vehicles require fair value expense recognition at grant under ASC 718. That's table stakes. The difference is in how clean the accounting is.
RSUs are straightforward: grant-date stock price × number of shares = expense, spread over the vesting period.
Options require Black-Scholes modeling with assumptions about volatility, expected term, and risk-free rate — every one of which the company’s auditor will have an opinion about. For a company with volatile stock or a rapidly climbing 409A valuation, RSUs often produce a lower accounting charge per dollar of value actually delivered to the employee. Flip it around: when volatility is low and the stock price is relatively stable, options are the cheaper vehicle on paper — Black-Scholes values them at a fraction of the share price, so you're booking less expense per grant than you would with RSUs valued at full market price.
Pre-revenue biotech is a good case study for the tension: high volatility inflates the Black-Scholes value, but the absolute share price is often low enough that the per-grant dollar expense on options still comes in below what you'd book for RSUs at full market value. A $3 stock with a $2.10 Black-Scholes value is still cheaper to expense than a $3 RSU. On the other hand, if that stock runs to $15 on a positive Phase 3 readout, the employee with options captured $12 of upside — while the RSU holder got their $15 but gave up nothing for it and didn't need the catalyst to go their way. The "right" answer depends on what your company can afford, what story you're telling recruits, and how much risk your employee population is actually willing to absorb.
Tax
On the tax side, the company gets a deduction when the employee recognizes income. With RSUs, that's at vest — predictable, matches the vesting schedule, easy for the tax team to forecast. With options, it's at exercise — whenever the employee decides to pull the trigger, which could be never.
That "never" scenario is worth sitting with: if the stock stays flat or drops below strike, employees don't exercise, and the company never gets the deduction — even though it’s been booking the accounting expense the entire time. You took the P&L hit with nothing to show for it on the tax side. With RSUs, the deduction always materializes because vesting isn't optional.
The tradeoff is that when options do get exercised — especially after a big run-up — the deduction can be significantly larger than what you'd get from RSUs, because the spread at exercise can far exceed the stock price at the RSU vest date. So options are a gamble on both sides of the table: the employee is betting the stock goes up, and your tax team is betting someone actually exercises. RSUs are the boring, reliable play — the deduction is smaller but it always shows up.
While we're on tax treatment, it's worth untangling the ISO/NQSO distinction because it changes the math for both sides.
Incentive Stock Options (ISOs) let employees defer the tax hit — no ordinary income at exercise if they hold the shares for at least two years from grant and one year from exercise. Meet those holding periods, and the entire gain gets capital gains treatment. Sounds great on paper. In practice, two problems.
First, the spread at exercise is an AMT preference item, which means an employee might owe Alternative Minimum Tax in the exercise year even though they haven't sold anything or seen a dollar of cash. That's how people end up with six-figure tax bills on shares they can't sell — it happened to a lot of tech employees in the dot-com era and it still happens today.
Second, ISOs are capped at $100K in vesting value per year. Anything above that automatically converts to NSOs. For the company, ISOs are less favorable: the company gets no tax deduction at exercise. With NSOs, the employee pays ordinary income tax on the spread and the company gets a corresponding deduction. So, the company is essentially subsidizing the employee's tax benefit by giving up its own. That's a real cost, and it's one reason many companies shift to NSOs or RSUs as they grow — the board starts caring about that lost deduction.
Dilution
From a shareholder's perspective, all equity comp is dilution — the question is how transparent, costly and predictable that dilution is.
RSUs are the cleanest: shares vest on a schedule, they show up in the fully diluted share count, and investors can model the impact quarter by quarter.
Options are messier. They sit in the treasury method calculation, and the actual dilution depends on how many are in-the-money and when employees choose to exercise. A rising stock price means more options become dilutive; a falling stock price means they drop out of the calculation entirely. That sounds convenient but it also means company’s dilution spikes exactly when the stock is performing well — which is exactly when shareholders are paying the most attention.
PSUs add another layer: if payout ranges are 0–200% of target, investors have to guess where performance will land, and proxy disclosures on PSU methodology are dense enough that most retail shareholders skip past them. This is why institutional investors often say they prefer RSU-heavy programs — not because RSUs are better for employees, but because they're easier to model and harder to game. When designing your equity program, the company is not just solving for employee’s motivation. The company is making a statement to the cap table about how much dilution shareholders are taking and how honest the company is about it.
Precommercial biotech is the notable exception. Shareholders in these companies often prefer options over RSUs — and the logic is straightforward. When their entire investment thesis is a binary catalyst (Phase 3 data, FDA approval), shareholders want employees who are aligned with that upside, not just along for the ride. Options do that: they're worthless if the stock stays flat, so employees only win when shareholders win. RSUs pay out regardless, which means the company is issuing shares — and diluting — even if the pipeline goes nowhere. For a cash-burning biotech where every share matters and the share price might be $3, issuing RSUs feels like giving away equity for free.
Options at least set a bar: the stock has to go up for the dilution to "cost" shareholders anything. Add to that the fact that precommercial biotech share counts are already under pressure from secondary offerings and ATM programs to fund operations — shareholders don't want to see additional guaranteed dilution from RSU vesting on top of that. In this context, options aren't just cheaper for the company; they're a better deal for the people who own the stock.
The Liquidity Problem for Employees
Here's what the equity valuation spreadsheet doesn't capture: how the employee feels about the grant.
An RSU in a public company that vests into shares employee can sell on their brokerage platform that afternoon feels like cash. An option in a Series A startup where there's no secondary market and no exit timeline feels like Monopoly money. According to some surveys, employees mentally discount illiquid equity by 50–70% — regardless of what the company’s 409A says it's worth. The company can put $200K of option value in an offer letter, and the candidate is mentally counting it as $60K, maybe less.
Secondary markets like Carta and Forge exist, but let's be honest about who actually navigates a tender offer with ROFR restrictions and board approval windows. It's not your regular employees.
Post-IPO, the psychology flips. RSUs feel too liquid — employees vest and sell within minutes. Rational behavior, but it kills long-term alignment. This is the one place where PSUs genuinely earn their complexity: the performance conditions create a forced holding period tied to outcomes the company actually cares about. If you can get the metrics right — and that's a real "if" — PSUs are the best alignment tool in the kit for public companies.
Options have their own liquidity psychology that's different from both. Even in a public company with a liquid stock, an option doesn't feel liquid — it feels like a decision. The employee has to choose when to exercise, whether to hold or sell, whether to come up with cash for the strike price or do a cashless exercise. That friction is real.
Plenty of employees sit on in-the-money options for years because the decision feels too complicated or they keep waiting for a higher price. And when the stock drops below strike, the option goes from "decision I'm postponing" to "thing that doesn't exist" in the employee's mental accounting.
Underwater options are psychologically worse than not having equity at all — the employee was promised upside, watched it disappear, and now has a line item in their equity portal that reminds them of it every time they log in. At least with an RSU that drops in value, you still vest into something. An underwater option vests into a reminder.
Stage-by-Stage: What Typically Works
Series A: Options. 409A is low, the upside story is the whole pitch, and anyone joining at this stage has self-selected for risk. ISOs up to the $100K limit, NSOs above. RSUs don't work here — they'd trigger tax on vesting for shares the employee can't sell. Nobody wants that.
Pre-IPO (Series C+ / late stage): Double-trigger RSUs start making sense. Time-based vesting plus a liquidity event trigger means no tax hit until there's actual cash. 409A has climbed enough that option strike prices aren't exciting anymore. The employees the company is hiring at this stage want to see value, not bet on it.
Public, no revenue: Volatile territory. Options can still capture asymmetric upside, but if the stock drops, they're worthless as a retention tool. The company can't re-price without a governance headache. A mix of RSUs (floor) and options (upside) hedges both directions, but it's also harder to communicate, plus your board may still want to stick to options. Pick your complexity.
Public, not profitable: RSU-heavy. Employees typically need the "this is always worth something" reassurance. Layer of PSUs tied to path-to-profitability metrics, like gross margin improvement, might be an operating leverage, telling a strategic story through comp. That has real value in earnings calls and board decks, not just offer letters.
Public profitable, Russell 2000: RSUs for broad-based, PSUs for leadership. The stock is liquid, employees expect tangible value. PSU metrics shift to relative TSR against index peers. The upside narrative weakens when growth is moderate, the market knows it, and it works against options.
Public profitable, S&P 500: The large-cap playbook everyone copies from each other: RSUs for retention across the org, PSUs for senior leaders with TSR/ROIC/EPS targets, options mostly gone or reserved for a handful of executives. At this scale, dilution management is a board-level conversation, and simplicity wins.
Equity Vehicle Comparison Matrix
RSUs, PSUs, and Stock Options across company growth stages
| Series A | Pre-IPO | Public / No Revenue | Public / Not Profitable | Public / Russell 2000 | Public / S&P 500 | |
|---|---|---|---|---|---|---|
| Typical Primary Vehicle | Options (ISO/NSO) | Double-trigger RSU | Options + RSU mix | RSU | RSU | RSU |
| Typical Secondary Vehicle | — | Options | — | PSU (path metrics) | PSU (relative TSR) | PSU (TSR/ROIC/EPS) |
| Liquidity | None | Limited / secondary | Liquid, volatile | Liquid | Liquid | Highly liquid |
| Employee Perceived Value | Lottery ticket | Deferred payday | Uncertain | Moderate | Tangible | Cash-like |
| Dilution Predictability | Low | Moderate | Low | High | High | High |
| Retention Power | Low (binary) | Moderate | Low–Moderate | Moderate–High | High | High |
| Accounting Complexity | Low | Moderate (triggers) | Moderate | Low | Low–Moderate (PSUs) | Moderate (PSUs) |
