RSUs Explained: What to Do When Your Stock Vests

If you work in tech, biotech, or finance, restricted stock units (RSUs) probably make up a meaningful chunk of your compensation — and possibly the majority of your net worth on paper. Most executives we work with at Private Wealth Collective are surprised by two things when their RSUs vest: how much tax they actually owe, and how much risk they're carrying in a single stock.

This guide walks through what happens at every stage of the RSU lifecycle, the two traps that quietly cost equity-comp holders tens of thousands of dollars a year, and the playbook our clients use to turn paper wealth into a diversified portfolio without overpaying the IRS.

What is an RSU, actually?

A restricted stock unit is a promise from your employer to deliver shares of company stock on a future date, provided you're still employed and any performance conditions are met. RSUs are not stock options. There's no strike price, no decision to "exercise," and no risk of going underwater. If the shares are worth $1, you get $1 of value. If they're worth $400, you get $400 of value.

The lifecycle has three stages:

1. Grant. Your employer awards you, say, 4,000 RSUs that will vest over four years. Nothing is taxable at grant. You don't own any shares yet.
2. Vesting. On each vesting date, a portion of the grant converts from a promise into actual shares deposited in your brokerage account. Most companies vest quarterly or monthly after an initial one-year cliff, though performance-based RSUs (PSUs) can vest only when specific targets are hit.
3. Delivery. The shares hit your account and become yours to hold or sell. From this point forward, they behave like any other stock you own.

The taxable event is vesting — not grant, and not sale. That's where most of the confusion (and most of the planning opportunity) lives.

How RSUs are taxed at vest

On the day your RSUs vest, the full fair market value of the shares is treated as ordinary income — exactly as if your employer had paid you a cash bonus equal to that amount and you'd immediately bought company stock with the proceeds.

A simple example: 100 shares vest at a closing price of $200. You have $20,000 of W-2 income on that day. It shows up on your year-end W-2 alongside your salary and bonus, and it's subject to federal income tax, FICA (Social Security up to the wage base, plus Medicare), state income tax, and any local taxes.

Your employer is required to withhold tax at vest. For most companies, this happens automatically via sell-to-cover: a chunk of your vesting shares is sold the same day, and the proceeds go to the IRS and your state tax agency on your behalf. The net shares end up in your brokerage account.

Two other settlement methods exist:

• Net-settle (net share withholding). Your employer holds back enough shares to cover the tax, and you receive only the net number of shares. No open-market sale happens.
• Cash payment. You write a check to cover the tax withholding, and you keep all the shares. Less common.

The settlement mechanic isn't the important part. The withholding rate is — because for most executives, it's wrong.

Trap #1: The 22% withholding gap

Here's the most expensive misconception in equity comp: the 22% your employer withholds at vest is not your actual tax rate.

Under IRS rules for 2026, supplemental wages — bonuses, commissions, and RSU vesting income — are withheld at a flat federal rate of 22% up to $1 million of supplemental wages per year, and 37% on anything above $1 million. This is a statutory default that applies regardless of your actual tax bracket.

If you're a senior engineer or executive earning $400,000+ in salary plus a meaningful RSU grant, your marginal federal rate is probably 32%, 35%, or 37%. Your RSUs were withheld at 22%. That's a 10- to 15-point gap on every dollar of vesting income.

Worked example: an engineering director with $500,000 of salary and $400,000 of RSU vesting in a calendar year sits in the 35% federal bracket. The employer withholds $88,000 on the RSU income (22%). The actual federal tax owed on that income is closer to $140,000 (35%). The shortfall: $52,000, owed at tax filing time and potentially subject to underpayment penalties.

Add state tax (California residents at the top bracket owe another 13.3%), and the bill can be eye-watering for executives who assumed "tax was withheld."

The fix is mechanical: project your actual marginal rate at the start of the year, and either increase your W-4 withholding on your regular paycheck or make quarterly estimated payments to close the gap. We cover this in our windfall and liquidity event playbook, which has the same underwithholding dynamic when business sales or IPOs hit.

Trap #2: The cost basis $0 problem

This is the single most expensive trap for RSU holders, and it's almost entirely a paperwork problem.

When your shares vest, the IRS rule is that your cost basis equals the fair market value on the vest date — the same number that was added to your W-2 as income. If 100 shares vested at $200, your basis is $20,000 ($200 per share). This makes sense: you've already paid ordinary income tax on that $20,000, so when you sell, you should only owe tax on the appreciation from $200 forward.

But here's the problem. Under current IRS rules, brokers are only required to report the actual money paid for the shares on Form 1099-B — which for RSUs is $0. Many brokers (Fidelity, Schwab, E*TRADE, Morgan Stanley, and others) will dutifully report a cost basis of $0 to the IRS, even though your real economic basis is the vest-date FMV.

What this means in practice:

• You vest 100 shares at $200. W-2 income: $20,000.
• You sell the same day for $200. Real economic gain: $0.
• Broker reports to IRS: $20,000 sale proceeds, $0 basis = $20,000 of capital gain.

You've now been taxed twice on the same $20,000: once as ordinary income via your W-2, and again as capital gain on your 1099-B. At a combined federal-plus-state marginal rate of 45%, that's $9,000 of unnecessary tax — on a single small vest. Scale it to a senior executive vesting seven figures over the year, and the double-tax exposure runs into six figures.

The fix lives on Form 8949 and Schedule D of your tax return. You (or your CPA) need to add an adjustment in column (g) — code B for "basis reported incorrectly" — that bumps your basis from the broker's $0 figure up to the correct vest-date FMV. Most tax software will let you enter the "supplemental" or "adjusted" basis, but you have to know to look for it.

The single most important thing you can do: save every vesting statement and every "supplemental information" PDF your broker sends you. That document shows the FMV used for tax reporting on each lot. Your CPA needs it; the broker's standard 1099-B alone is not enough.

Hold or sell at vest? A decision framework

Once shares vest, you have a clean decision to make — and the math actually pushes most of our clients toward selling.

Here's the key insight: at the moment shares vest, holding them is economically equivalent to taking your cash bonus and using it to buy company stock that day. No one would write themselves an unsolicited check to load up on their own employer's stock — but that's exactly what holding RSUs after vest amounts to.

The decision framework we use:

1. Tax neutrality after vest. You've already paid ordinary income tax on the full FMV. Any future appreciation is capital gain (short-term if held under one year from vest, long-term after). There is no remaining tax incentive to hold the shares versus diversifying.
2. Concentration risk. A common rule of thumb is no more than 5–10% of investable net worth in a single stock — and that goes double for the stock that also writes your paycheck. If your employer hits trouble, you can lose your job and a chunk of your net worth in the same quarter. We saw this play out at Enron, Lehman, WeWork, and a long list of post-IPO tech names that round-tripped.
3. Behavioral honesty. Most "I want to hold for long-term gains" reasoning is loss-aversion in disguise. The real test: if your employer paid you the cash equivalent today, would you buy this many shares at this price? If the answer is no, sell.

The default playbook for our clients is automatic same-day sale at vest, with the proceeds rolling into a diversified portfolio that matches their broader financial plan. Holding a meaningful concentrated position is fine — but only with a written thesis, a tax plan, and clear exit triggers.

10b5-1 plans for executives with insider information

If you're an officer, director, or other corporate insider, you can't simply sell shares whenever you want — blackout windows and material non-public information (MNPI) restrictions limit your trading to roughly half the year. The standard solution is a Rule 10b5-1 plan.

A 10b5-1 plan is a written, pre-committed trading instruction that you adopt when you don't have MNPI — typically right after earnings. The plan tells your broker to sell X shares at Y price or on Z date, automatically, without your further involvement. Because the trades are pre-scheduled, they're protected from insider-trading allegations even if material news drops later.

Recent SEC rules (effective 2023) require a cooling-off period between plan adoption and the first trade — generally 90 days for executives and directors, longer in some cases. Plans must also be made in good faith and not as part of a scheme to evade trading rules.

For HNW executives at public companies, 10b5-1 plans are how you systematically diversify out of concentrated stock without legal exposure. They also remove the emotional element — once the plan is in place, the trades happen on schedule whether or not the stock has had a "good run."

Charitable strategies for appreciated shares

If you do choose to hold a portion of your RSU shares long enough to build a meaningful unrealized gain — at least 12 months from vest to qualify for long-term capital gains — you unlock one of the most efficient moves in equity-comp planning: giving appreciated shares to charity.

The mechanics: when you donate long-term appreciated stock to a qualified charity (including a donor-advised fund, or DAF), you generally get to deduct the full fair market value on the date of the gift, and you completely avoid the capital gains tax you would have owed on a sale. The charity sells the shares tax-free.

For executives sitting on highly appreciated employer stock, three strategies come up repeatedly:

• Donor-advised fund (DAF). Easy to open at Fidelity Charitable, Schwab Charitable, or Vanguard Charitable. You contribute the shares, get the full FMV deduction in the contribution year, and then grant out to charities over time. Ideal for bunching deductions into a high-income year (like a big vesting year or an IPO).
• Charitable remainder trust (CRT). A CRT lets you contribute appreciated shares, receive an income stream for life or a term of years, get a partial charitable deduction, and have the remainder pass to charity. Useful for very large, concentrated positions where you want diversification, lifetime income, and a charitable result in one structure.
• "Stock-and-swap" / cash replacement. Donate appreciated employer stock to charity and use the cash you would have donated to buy back the same shares (or different shares) in your taxable account. Net effect: your portfolio looks the same, but your cost basis is reset to current FMV, eliminating the embedded gain. You get the deduction either way; this version preserves market exposure if you wanted to keep holding the position.

Coordinating these moves with a thoughtful estate plan and a charitable strategy aligned with your values is exactly the kind of work a wealth manager and CPA should be doing together.

Estimated tax payments and the underpayment penalty

The IRS expects you to pay tax throughout the year, not just in April. If you have meaningful RSU income, the 22% withholding shortfall is going to push you into underpayment territory unless you actively manage it.

The two safe harbors that protect you from underpayment penalties:

• Pay in at least 90% of the current year's total tax liability through withholding and estimates, or
• Pay in at least 110% of last year's total tax liability (for AGIs over $150,000) through withholding and estimates.

The second safe harbor is the easier one to plan around. If you know last year's federal tax was, say, $250,000, you need to have paid in $275,000 (110%) by year-end via W-2 withholding plus quarterly estimates (due April, June, September, and January). Anything beyond that just becomes your April refund or check.

The mechanical fix many of our clients use: at the start of each year, project total income (including expected RSU vesting), calculate the expected federal and state tax bill, subtract expected W-2 withholding, and divide the rest into four estimated payments. Then revisit mid-year if grants change.

State tax: the trap when you move

This catches people who relocate after a vesting cliff.

Most states tax RSU vesting income to the state in which you were a resident — or in which you performed the services that earned the grant — during the period from grant to vest. If you received an RSU grant while working in California, then moved to Texas (no income tax) before the shares vested, California may still claim a portion of the vesting income based on the proportion of the grant-to-vest period you spent as a California resident or worker.

California is particularly aggressive on this. The Franchise Tax Board uses a "workdays in California" allocation method that can claw back a significant portion of vesting income even years after you've moved. New York applies similar rules to former residents.

Practical implications:

• If you're planning a relocation from a high-tax state and you have unvested RSUs, talk to a CPA before you go. There are sometimes vesting-acceleration or grant-restructuring opportunities at the executive level.
• Document your move carefully: lease/sale of residence, voter registration, driver's license, where your family lives, where you work the majority of the year. State tax residency cases are won and lost on documentation.
• Don't assume the move alone solves it. The source state can tax the portion of the grant attributable to the time you lived/worked there.

How RSUs fit with ESPP and stock options

Most equity-comp packages bundle RSUs together with an employee stock purchase plan (ESPP) and sometimes incentive stock options (ISOs) or non-qualified stock options (NSOs). They interact:

• ESPPs typically let you buy company stock at a 5–15% discount through after-tax payroll deductions. The discount is taxed as ordinary income at purchase or sale depending on whether the disposition is "qualifying" (held long enough) or "disqualifying."
• ISOs can be tax-favored — no ordinary income at exercise if you hold long enough — but they trigger alternative minimum tax (AMT) consequences on the spread between strike price and FMV at exercise.
• NSOs are taxed similarly to RSUs at exercise: ordinary income on the spread, then capital gains treatment on appreciation after exercise.

Concentration risk compounds across all of these. If you have RSUs vesting and you're maxing your ESPP and you're holding ISOs you exercised in a prior year, your single-stock exposure can balloon quickly. Building a written equity-comp policy — what gets sold automatically, what gets held, what triggers a diversification rebalance — is one of the highest-leverage things HNW executives can do.

We'll cover ESPP mechanics and ISO/NSO taxation in upcoming articles in this series; for now, the key point is that RSUs are usually the largest and simplest piece of the puzzle, and getting them right makes the rest of the planning much cleaner.

Performance vesting (PSUs) and vesting cliffs

Not all RSUs vest just because time passes. Many executive grants are structured as performance stock units (PSUs) that vest only if specific business targets are met — total shareholder return relative to a peer index, revenue growth, EBITDA milestones, or other KPIs.

PSU tax treatment is the same as RSU treatment at the vest date: full FMV of the shares that actually vest is ordinary income, withheld at supplemental rates. The difference is that there's no taxable event until the performance condition is met and the shares are delivered. If the target isn't hit, the PSUs simply expire without becoming income.

Cliff vesting — where nothing vests until a specific date (usually the one-year anniversary) and then a chunk vests at once — creates concentrated tax bills. A 25% one-year cliff on a four-year, $1 million grant means $250,000 of ordinary income on a single day, with 22% withholding (insufficient for any high earner) and a single-day spike of concentrated stock to manage. Plan accordingly.

What happens to unvested RSUs if you leave

This is where many tech and biotech employees lose the most money — not from bad investing decisions, but from misunderstanding their vesting schedule when they accept a new role.

The general rule: unvested RSUs are forfeited when you leave the company, regardless of whether you quit, are laid off, or are terminated. Vested shares are yours forever; unvested grants disappear.

Exceptions and nuances:

• Acceleration on change of control. Many executive grants accelerate vesting if the company is acquired or merges. Read the grant agreement carefully — single-trigger (acceleration at the deal close) and double-trigger (acceleration only if you're also terminated within a window after the deal) are common variants.
• Severance negotiations. Departing executives can sometimes negotiate vesting acceleration as part of a separation package, particularly at the C-suite level.
• Retirement provisions. Some grant plans provide continued vesting for employees who retire after a certain age and tenure (often 55+ with 10+ years of service). Worth checking before you announce a departure.
• Death and disability. Most plans accelerate vesting on death and total disability.

If you're considering a job change and you have meaningful unvested RSUs, the timing matters enormously. Negotiating a sign-on bonus or accelerated grant at your new employer to cover what you're walking away from is a standard tactic — but only if you know the number you're leaving behind. And if a job loss is unexpected, the financial planning playbook for the first 30 days after a layoff becomes urgent fast.

The HNW RSU playbook

If you're a tech, biotech, or finance executive with significant RSU exposure, here's the framework we use with clients:

1. January tax projection. Project total income for the year (salary + bonus + expected RSU vesting + ESPP + any option exercises). Calculate expected federal and state tax. Set a target paid-in number that hits the safe harbor.
2. Increase W-4 withholding or set up quarterly estimates. Close the 22% gap mechanically. Don't wait until April.
3. Default to automatic sale at vest. Set up a 10b5-1 plan if you're a corporate insider. Otherwise, put a standing sell order in place that liquidates each tranche at vest and sweeps the cash to a diversified portfolio.
4. Hold concentrated only with a written thesis. If you're going to hold employer stock beyond vest, write down why, what your exit triggers are, and what concentration cap you won't exceed (5–10% of investable assets is a reasonable starting point).
5. Save every supplemental statement. Vest-date FMV documentation prevents the cost basis $0 trap from costing you tens of thousands.
6. Charitable layer for long-term holders. Direct appreciated shares to a DAF or CRT in high-income years. Bunch deductions for maximum effect.
7. Coordinate with the rest of the equity-comp stack. ESPP, options, deferred comp, and 401(k) all interact. A wealth manager and a CPA who work together on this regularly are worth the fee many times over.
8. Re-evaluate at every grant. New grants stack on top of unvested ones. Without regular review, concentration risk grows quietly until something forces a reckoning.

We help clients build this playbook into a written investment policy statement that survives the inevitable temptation to time the market on a "favorite stock." If you'd like to talk through how RSUs and equity comp fit into your broader plan, book a consultation with a Private Wealth Collective advisor.

Frequently asked questions

How are RSUs taxed compared to stock options?

RSUs are taxed as ordinary income on the full fair market value at vest — there's no exercise decision and no AMT consideration. Non-qualified stock options (NSOs) are taxed as ordinary income on the spread between strike price and FMV at exercise. Incentive stock options (ISOs) can avoid ordinary income tax at exercise if you hold the shares long enough, but the exercise can trigger alternative minimum tax. RSUs are simpler, but options can be more tax-efficient if managed carefully.

Should I always sell my RSUs as soon as they vest?

For most HNW executives, yes — by default. You've already paid ordinary income tax on the full value, so holding the shares is economically the same as taking the cash and buying that much employer stock today. Diversifying out reduces concentration risk and doesn't cost you any additional tax. The exception is a deliberate, written decision to hold a concentrated position with a clear thesis, exit triggers, and a concentration cap.

Why does my broker show my cost basis as $0?

Under current IRS rules, brokers are only required to report the cash you actually paid for the shares on Form 1099-B — and for RSUs, that's $0. Your real economic cost basis is the fair market value on the vest date (the same amount that hit your W-2). You or your CPA must add a Form 8949 adjustment to correct this when filing your return. Without the adjustment, you'll be double-taxed on the vesting income. Save every supplemental statement your broker sends — that's where the correct basis lives.

Will I owe more tax in April because of my RSUs?

Almost certainly, if you're in the 32% federal bracket or higher. RSUs are withheld at a flat 22% on supplemental wages up to $1 million for the year (and 37% on amounts above $1 million). If your marginal rate is higher than 22%, you'll owe the difference at filing. Mitigate this by increasing W-4 withholding on your regular pay or making quarterly estimated payments throughout the year.

What happens to my unvested RSUs if I quit or get laid off?

In nearly all cases, unvested RSUs are forfeited when employment ends. Vested shares are yours to keep. Some executive grants include acceleration provisions on a change of control, retirement after a certain age/tenure, death, or disability. Always read your grant agreement before making a job change — and consider negotiating sign-on equity at your next employer to cover the forfeited value.

Can I donate RSU shares to charity to avoid tax?

You can't avoid the ordinary income tax at vest — that's locked in the moment the shares are delivered to you. But once you own the shares, if you hold them more than 12 months and they appreciate, you can donate the appreciated shares to a donor-advised fund or qualified charity and (1) deduct the full fair market value, and (2) avoid the capital gains tax on the appreciation. This is one of the most tax-efficient moves available to long-term holders of employer stock.

Do I need to make quarterly estimated tax payments because of my RSUs?

If your withholding (W-2 plus any RSU sell-to-cover) won't cover at least 90% of your current-year tax liability or 110% of last year's (for AGIs over $150,000), then yes — you'll likely need to make quarterly estimates to avoid an underpayment penalty. The fix is straightforward: project your full-year tax bill in January, subtract expected withholding, and divide the rest into four payments due April, June, September, and the following January.

How much of my net worth should I have in employer stock?

A common rule of thumb among financial planners is no more than 5–10% of investable assets in any single stock — and even less when that stock is also the source of your paycheck. Concentration above that level should be a deliberate decision with a written thesis, defined exit triggers, and a clear understanding that you're accepting elevated risk in exchange for a specific potential upside.

My two cents

RSUs feel like a windfall and a salary at the same time. They're neither, exactly — they're a forced asset allocation into a single stock, with a tax bill attached. The clients who do best with significant equity comp treat each vest like a paycheck that automatically converts to a diversified portfolio, not a casino chip to ride. The math is rarely on the side of holding. The psychology often is.

If you've accumulated meaningful RSU exposure and want a written plan covering tax projection, automatic diversification, charitable strategy, and how the rest of your equity comp stack fits in, our team can help. Book a free consultation to get started.