The RSU Trap: When Employer Stock Becomes a Hidden Liability

Part 4 of the Rational Compounding Framework

A friend at Google had a realization last year that I’ve watched play out more times than I can count. He’d been there seven years. Did everything right — maxed his 401k, contributed to index funds, saved aggressively. His net worth dashboard showed $1.2 million and he felt, reasonably, like the plan was working.

Then he actually looked at the breakdown. $780K in Google stock. $320K in diversified investments. $100K in cash. One company. Two-thirds of his wealth.

“But Google’s stable,” he told me. “It’s not going anywhere.”

I asked him what Meta’s stock price was in September 2021. He said around $380. I asked him what it was in November 2022. Long pause. “$88,” he said.

That’s a 77% drop. On $780K, that’s waking up with $179K. In fourteen months. Not because anything went wrong with the business fundamentally — but because Mark Zuckerberg decided to spend $10 billion on the metaverse while Apple dismantled their ad targeting. Decisions made in a boardroom that had nothing to do with the thousands of employees whose wealth was tied to the outcome.

This is the RSU trap. And the uncomfortable truth is that most tech workers are in it right now without fully registering how exposed they are.

Why RSUs Are Riskier Than They Feel

Restricted Stock Units feel like free money because they arrive without the emotional weight of a purchase decision. You didn’t choose to buy the stock. It showed up in your brokerage account, already paid for, already generating a number on your net worth dashboard. That framing — compensation received, not investment made — is exactly what makes RSUs so quietly dangerous.

The risk runs on multiple layers. The most obvious one is concentration: holding 60–70% of your net worth in a single stock is a bet that almost no professional investor would make with their own capital, yet it’s the default outcome for tech workers who let RSUs accumulate without a sell discipline.

But there’s a second layer that makes it worse. Your salary comes from the same company as your stock. If the company runs into serious trouble, you don’t just lose portfolio value — you lose income and portfolio value simultaneously. The diversified investor who gets laid off still has their 401k intact. The RSU-heavy employee who gets laid off during a downturn loses their paycheck and watches their unvested shares get cancelled at the same moment their vested shares are falling. That’s a different order of magnitude of risk.

The vesting schedule adds a third layer. You can’t sell what hasn’t vested yet, which means during a downturn you’re watching shares you were promised shrink in value with no ability to act. Join at $200 per share, and by the time year two’s tranche vests, the stock is at $95. You took the compensation risk — the share of whatever happened to the stock between grant and vest — without having chosen to make that investment.

Then there’s the tax trap that keeps people holding longer than they should. When RSUs vest, they’re taxed as ordinary income — not capital gains. Your brokerage automatically sells a portion of shares to cover withholding, usually around 22%, which sounds like the tax is handled. For most high earners it isn’t — if you’re in the 32–37% federal bracket, the 22% withholding leaves a gap that surfaces as a surprise bill in April. The combination of not having to do anything at vesting, plus an unexpected tax bill when it arrives, creates a powerful psychological pull toward inertia. The shares just appeared. The taxes got handled somehow. The path of least resistance is to do nothing with what’s left.

What you’re actually doing when you follow that path is making an active investment decision to hold a concentrated position in a single stock. It just doesn’t feel like one because you didn’t choose it. The framing does the damage.

The 20% Rule and How to Apply It

The number that changes how you think about this is 20. No single stock — especially your employer’s — should exceed 20% of your total invested assets. Not 25 because it’s close to 20. Not 30 because the stock has been on a run. Twenty percent. The math behind the threshold is straightforward: at 20% concentration, even a catastrophic 70% drop in that stock costs you 14% of your total portfolio. Painful, but survivable. At 70% concentration — the actual exposure level for many FAANG employees — the same 70% drop takes nearly half your wealth with it.

The 2022 drawdowns made this concrete in a way that no amount of theoretical warning could. Meta fell 77% from peak to trough between September 2021 and November 2022. Netflix dropped 75%. Shopify lost 85%. PayPal fell 78%. These weren’t obscure companies or speculative bets — they were the household names that tech workers felt safe holding in concentration. The employees who were 70% concentrated in any of them lost more than half their net worth in twelve to eighteen months. The employees who’d held employer stock to 20% and diversified the rest lost around 14% of their portfolio on the same crash. Same employer, same company performance, dramatically different wealth outcomes. The only variable was the concentration level.

Here’s the part that trips people up on taxes: if you sell RSUs on the day they vest, you owe zero capital gains tax. The income tax was already assessed and paid at vesting — that’s done. Your cost basis is the share price on vest day. Selling at that price generates no taxable gain. The instinct to hold because selling means paying taxes is based on a misunderstanding of how the tax treatment actually works. You’re not avoiding taxes by holding. You’re deferring capital gains tax on any future appreciation while taking on full concentration risk on the principal. The question isn’t whether to pay taxes. It’s whether risking a 60% drawdown is worth deferring a 15–20% capital gains rate on the upside. For most people, when the math is laid out clearly, it isn’t.

Building a Sell Discipline

The reason most tech workers stay concentrated isn’t ignorance — it’s the absence of a system. Without a pre-committed rule, every vesting event becomes a fresh decision about whether now is a good time to sell. And “whether now is a good time” is a question that produces endless reasons to wait. The stock is on a run. Earnings are coming up. The product roadmap looks strong. You have insider context the market doesn’t. All of those thoughts are natural and almost none of them are good reasons to hold a position that represents 60% of your wealth.

The sell discipline that works is mechanical and calendar-driven. On every vesting date, sell enough shares to keep your employer stock concentration at or below 20% of your total invested assets. If you’re already below 20%, sell 50–60% of the vesting shares anyway and invest the proceeds in broad index funds — you can let the remainder ride if you want some continued upside exposure. Then, quarterly, check your concentration percentage. If it’s crept above 25% from stock appreciation, sell enough to bring it back to 20%. Set a calendar reminder for the first Monday of each quarter. It takes fifteen minutes.

What you do with the proceeds matters too. Before anything goes into a taxable brokerage, make sure tax-advantaged space is fully used — 401k, backdoor Roth, HSA. Whatever spills over goes into a taxable account in broad index funds: a total US market fund and an international fund, with expense ratios under 0.1%. No sector bets. No individual stocks. No alternatives you don’t fully understand. The whole point of selling the employer stock is to move from concentrated risk to diversified ownership of the market — don’t replicate the concentration problem with a different single name.

The psychological attachment to employer stock is real and worth naming directly. When you’ve held a position from $100 to $300, those gains feel earned — tied to your years at the company, your work, your loyalty. When it drops to $200 and you still don’t sell, it’s because exiting feels like admitting the gains weren’t real. When it drops to $100, you’re underwater and paralyzed. You watched someone else make the decision that cost you those returns, in a boardroom you weren’t in, and now you’re waiting for permission from the stock price to move on.

The wealth system is what removes that paralysis. Pre-committed rules, executed mechanically, don’t require you to make a fresh emotional decision at every vesting date. You follow the rules you wrote when your judgment was clear. That’s not pessimism about your employer. It’s recognizing that your financial security shouldn’t depend on decisions you don’t control.

RSUs are compensation. They arrived in your account as stock for tax and retention reasons that had nothing to do with what your optimal investment portfolio should look like. Your job is to treat them like the cash they represent, diversify appropriately, and build wealth that isn’t contingent on one company’s next quarter. That’s not disloyalty. That’s just how wealth is actually built.

This is Part 4 of the Rational Compounding Framework. Read Part 1: The Math of Wealth, Part 2: The 3 Engines, Part 3: Why High Earners Fail, or see the complete framework.

Next in the series — Part 5: Buy the Dip—But Only If You Have a Deployment System