A practical introduction to Restricted Stock Units — how they vest, how they're taxed, and how to make smart decisions about holding or selling company stock.
Start Reading ↓A Restricted Stock Unit (RSU) is a promise from your employer to grant you a specific number of company shares — but only after you've met certain conditions. Unlike stock options, RSUs have real value even if the stock price stays flat, because they are actual shares delivered to you upon vesting.
RSUs have become the dominant form of equity compensation at public technology and finance companies, largely replacing stock options. They're simpler to understand: you don't need to "exercise" anything or pay a strike price. When your RSUs vest, you simply receive shares.
The catch — and the reason this guide exists — is that vesting triggers an immediate tax event, and the decisions you make afterward about what to do with those shares can have significant financial consequences. Many employees make costly mistakes by treating RSU shares differently from cash compensation when making financial decisions.
This guide walks you through the mechanics of RSU vesting, the tax landscape, and frameworks for thinking clearly about your equity.
An RSU is essentially a deferred compensation arrangement — the company is saying: stay with us, hit your milestones, and we'll give you real ownership.
Core ConceptVesting is the process by which you earn ownership of your RSU shares over time. Until an RSU vests, you don't own the shares — you have a promise. Vesting schedules are defined in your grant agreement and are designed to incentivize you to stay at the company.
Most RSUs include a cliff — a minimum period you must work before any shares vest at all. After the cliff, shares continue to vest on a regular schedule. If you leave before the cliff, you lose all unvested RSUs.
Some RSUs are subject to both time-based vesting (tenure) and performance-based vesting (hitting targets). For performance RSUs, the number of shares you ultimately receive may vary based on company or individual metrics.
25% of shares vest after 12 months of service; the remaining 75% vest monthly or quarterly over the following three years. Standard at most large tech companies.
Some companies (notably Amazon historically) front-load vesting with 5% in Year 1, 15% in Year 2, then 40% each in Years 3 and 4. This creates different cash flow timing considerations.
Vest based on achieving specific metrics (revenue targets, TSR, etc.). Common for executives and senior leadership. Adds uncertainty to the ultimate share count.
At pre-IPO companies, RSUs often require two triggers: time-based vesting AND a liquidity event (IPO or acquisition). Unvested shares may have a long time horizon to actual ownership.
When RSUs vest, the fair market value of the shares is treated as ordinary compensation income — exactly like salary. It appears on your W-2 and is subject to federal, state, and FICA taxes at your marginal rate. This happens whether or not you sell.
Any gain (or loss) from selling shares above the vesting-day value is a capital gain. Hold for under 12 months: short-term (ordinary income rates). Hold for 12+ months: long-term capital gains, taxed at the favorable 0%, 15%, or 20% rates.
Most employers withhold at the IRS supplemental wage rate (22% federal), which may not cover your actual marginal rate if you're a high earner. This can lead to a surprise tax bill in April. Consider adjusting estimated taxes or W-4 withholding accordingly.
You have 1,000 RSUs that vest when your company's stock trades at $50/share. At vesting, $50,000 is added to your W-2 income and taxed at ordinary income rates. If you hold the shares for 14 months and sell at $60/share, the additional $10,000 gain is taxed at the more favorable long-term capital gains rate. If you sell immediately at $50, there is no additional capital gains tax liability — your income tax obligation was triggered at the moment of vesting.
One of the most overlooked hazards for employees receiving RSUs is concentration risk — having too large a percentage of your net worth tied to a single company's stock. This risk is amplified because your income and your investment portfolio are exposed to the same underlying business.
If your company has a bad year, you may face: a declining stock portfolio, reduced bonus, potential layoffs, and damaged career prospects all at the same time. These risks are highly correlated.
A common rule of thumb among financial planners is to keep single-stock exposure — including RSUs, ESPP shares, and any other employer stock — to no more than 10% of your investable assets. This threshold isn't arbitrary; it's informed by research on the incremental risk of concentrated positions.
Even high-quality blue-chip stocks can lose 40–70% of their value in market downturns, sector rotations, or idiosyncratic events. The same is true for the most well-regarded tech giants.
Set a rule — for example, sell 100% of RSUs within 30 days of each vest date. Automating the decision removes emotional friction and ensures you diversify consistently across market conditions rather than trying to time the market.
Define a personal ceiling for employer stock exposure (often 5–10% of net worth). Sell enough RSUs after each vest to stay below that threshold, and hold only what keeps you within your target band. Review annually.
If you hold accumulated employer stock with large embedded gains, work with a tax professional to pair sales with harvesting losses elsewhere in your portfolio, reducing the net capital gains tax burden from diversifying out of concentrated positions.
Executives and employees with insider knowledge may be subject to trading windows. A Rule 10b5-1 trading plan allows you to set up pre-scheduled sales in advance, enabling you to sell during blackout periods under a pre-established plan.
After selling RSU shares, deploy proceeds into a broadly diversified portfolio — total market index funds, international equities, and fixed income. Avoid the temptation to "double down" on your company's sector or related stocks.
If you have long-held employer stock with significant unrealized gains and a charitable intent, donating appreciated shares directly to a donor-advised fund avoids capital gains entirely and generates a full fair-market-value deduction.
The strategies above are provided for educational purposes only and do not constitute personalized financial or tax advice. Individual circumstances vary significantly. Consult a qualified financial planner (CFP) and tax professional (CPA or tax attorney) before making decisions about your equity compensation, particularly if you have large unvested grants, are subject to trading restrictions, or hold positions with substantial embedded gains.
A comprehensive guide to the tax treatment of all forms of equity compensation, including RSUs, stock options, and ESPPs. Essential reading for anyone with significant equity grants who wants to understand the mechanics in depth.
A practical, accessible handbook on making the most of equity compensation. Covers decision frameworks for when to exercise, sell, or hold — written for employees who want actionable guidance rather than academic treatment.
A well-maintained online reference covering the fundamentals of RSU mechanics, tax treatment, and comparisons with stock options and restricted stock awards. A good starting point before diving into the books above.