RSUs Explained: How They Work, How They're Taxed, and How to Avoid Paying Taxes Twice

If you just received your first Restricted Stock Unit (RSU) grant, congratulations! RSUs can be a powerful wealth-building tool for tech professionals.

But if you don't understand how they work, they can also create a lot of financial stress.

From vesting schedules and taxes to deciding whether to sell or hold, there's a lot to consider. And one mistake I see far too often is people accidentally paying taxes twice on their RSU gains because they don't correctly report their cost basis.

In this guide, I'll walk through:

• What RSUs are and how they work
• The difference between startup and publicly traded RSUs
• Vesting schedules and cliffs
• How much your RSUs are actually worth
• When you can sell your shares
• How RSUs are taxed
• How to avoid paying taxes twice
• How to decide whether to sell or hold
• When it makes sense to get professional help

What Are RSUs?

Restricted Stock Units, or RSUs, are essentially a promise from your employer to give you shares of company stock in the future, provided you meet certain conditions.

Companies use RSUs as a form of compensation because they want employees to have a financial incentive to help the business succeed.

The idea is simple: If the company performs well, the stock you receive could become a meaningful part of your wealth.

Over several years, those grants can add up to a substantial amount of money.

But there's an important distinction you need to understand.

Startup RSUs vs. Publicly Traded RSUs

Not all RSUs are created equal.

One of the first questions you should ask is whether your RSUs are from a startup or a publicly traded company.

Startup RSUs

Startup equity can have significant upside, but it generally doesn't have the same immediate, established market value as publicly traded stock.

Your employer might tell you that you have thousands of shares and even provide a hypothetical valuation showing that your equity could eventually be worth hundreds of thousands or millions of dollars.

Be careful with those projections.

Until there's a liquidity event — such as an IPO, acquisition, merger, or tender offer — there may be no practical way for you to turn those shares into cash.

For financial planning purposes, I generally encourage clients to be very conservative about assigning value to startup equity.

I've worked with people whose startup equity eventually became extremely valuable. I've also seen many more cases where startup equity never amounted to anything.

Think of startup equity as having potential value, rather than money you can count on today.

Publicly Traded RSUs

Publicly traded RSUs are different.

Because the company's stock trades on a public market, you can generally determine the current market value of your shares. Once your RSUs vest and you receive the shares, you can typically sell them, subject to company policies and applicable trading restrictions.

That makes publicly traded RSUs much easier to incorporate into a financial plan.

Understanding Your RSU Vesting Schedule

Your employer generally isn't handing you all of your RSUs on your first day.

Instead, you'll have a vesting schedule that determines when the shares become yours.

A four-year vesting schedule is common, although schedules can vary considerably.

Your RSUs may vest:

• Monthly
• Quarterly
• Annually
• According to another schedule specified by your employer

You may also have what's called a cliff.

What Is an RSU Cliff?

A cliff means you don't receive any shares until you've reached a specific milestone.

For example, imagine you receive 1,000 RSUs with a four-year vesting schedule and a one-year cliff.

You wouldn't receive any shares during your first year.

Once you reach the one-year mark, 25% of the grant — 250 shares — could vest. The remaining shares would then vest according to the schedule outlined in your grant agreement.

Your actual terms will depend on your employer's plan, so make sure you understand the specific vesting schedule attached to your grant.

Why RSUs Become "Golden Handcuffs"

Here's where things get interesting.

If you leave your employer before your RSUs vest, you will generally forfeit the unvested portion of the grant.

That can make changing jobs surprisingly difficult.

And it becomes even more complicated when your employer gives you refresh grants.

For example, imagine you receive a new four-year RSU grant every year.

After several years, you could have multiple grants vesting simultaneously, each with its own schedule.

Suddenly, leaving your employer could mean walking away from a substantial amount of compensation.

That's why RSUs are often called golden handcuffs.

The more equity you've accumulated, the more expensive it can feel to leave.

How Much Are Your RSUs Actually Worth?

This is one of the most important questions — and the answer depends heavily on whether your company is public or private.

For startup RSUs, the answer could effectively be zero today, even if the company gives you a hypothetical valuation.

Until you have a realistic path to liquidity, don't build your financial plan around money you may never be able to access.

Publicly traded RSUs are easier to value, but there's still an important wrinkle.

Your Grant Value Isn't Guaranteed

Suppose your employer tells you:

"You're receiving $100,000 worth of RSUs."

If the company's stock is trading at $100 per share when the grant is calculated, you might receive 1,000 shares.

But those 1,000 shares don't necessarily remain worth $100,000.

If the stock rises to $150 before the shares vest, they're worth $150,000.

If the stock falls to $50, they're worth only $50,000.

That's why you shouldn't make major financial commitments based on the assumption that your RSUs will retain their initial grant value.

If you're projecting future income or planning a major purchase, it's generally wise to use conservative assumptions.

When Can You Sell Your RSUs?

For publicly traded companies, you can generally sell your shares once they vest and you own them — but there can be important restrictions.

One of the biggest is a trading blackout period.

Companies sometimes restrict employees from trading their stock during certain periods, particularly around quarterly earnings announcements.

The exact rules vary by company and by employee.

If you are subject to trading windows or blackout periods, understand those restrictions before building your RSU strategy around a specific sale date.

The inability to sell during a blackout can also expose you to additional market risk. If the stock drops while you're unable to trade, you may have limited ability to respond.

That's one reason it's helpful to establish a strategy before the shares vest rather than making decisions based on whatever the stock happens to be doing that day.

How Are RSUs Taxed?

Taxes are one of the most important parts of RSU planning.

The rules can differ depending on the type of equity you have and your specific circumstances, so you should always confirm the details with a qualified tax professional.

For publicly traded RSUs, the value of the shares is generally treated as ordinary income when they vest.

For example, suppose 100 shares vest when the stock is worth $100 per share.

That's $10,000 of value, which is generally included in your taxable compensation.

Your employer will typically withhold taxes when the shares vest, often by withholding shares or selling shares to cover the required withholding.

Why You May Still Owe More at Tax Time

Here's an issue that surprises many people.

Your employer's withholding may not equal your ultimate tax liability.

For example, if the federal withholding rate applied to your RSUs is 22%, but your marginal federal tax rate is higher, you may owe additional taxes when you file your return.

That's why it's important to estimate your total tax liability rather than assuming the withholding automatically means you're fully covered.

Depending on your situation, you may decide to sell additional shares to generate cash for the tax bill or adjust withholding elsewhere.

The right approach depends on your overall financial plan.

Try the RSU Tax Calculator to estimate the federal tax impact of your vested RSUs, including withholding, estimated taxes, and net value after taxes.

What Happens If You Hold Your RSUs After They Vest?

This is where the tax treatment changes.

Once your RSUs vest, the value included in your income generally establishes your cost basis in the shares.

Let's say 100 shares vest when they're worth $100 each.

Your cost basis would generally be $10,000.

If you later sell those shares for $12,000, you've generated a $2,000 gain.

That gain is generally treated as a capital gain.

The holding period matters:

• Shares held for one year or less generally produce short-term capital gains, which are typically taxed at ordinary income tax rates.
• Shares held for more than one year may qualify for the lower long-term capital gains tax rates, depending on your circumstances.

The specific tax treatment can vary, so don't make a decision solely based on the one-year holding period without considering investment risk and your broader financial plan.

The Big One: Don't Pay Taxes Twice on Your RSUs

This is one of the biggest RSU tax mistakes I see.

When your RSUs vest, you've generally already paid taxes on the value of the shares at that time.

That amount becomes your cost basis.

The problem is that your brokerage's tax reporting may not always make that cost basis obvious on the form you're looking at.

Sometimes the reported basis may appear to be missing, incomplete, or different from what you expected.

If you simply accept the reported number without checking it, you could accidentally report too little cost basis and pay tax on income you've already been taxed on.

Here's a Simple Example

Suppose:

• 100 RSUs vest at $100 per share
• You have $10,000 of taxable compensation from the vesting
• Your cost basis is therefore generally $10,000
• You later sell the shares for $12,000

You should generally have a $2,000 capital gain — not a $12,000 capital gain.

That's a huge difference.

Where to Look for Your Cost Basis

Finding the correct number can require some detective work.

Depending on your employer and brokerage, you may need to cross-reference:

• Your brokerage tax forms
• Supplemental tax statements
• Your transaction history
• Your vesting statements
• Your employer-provided documents
• Your W-2

Don't assume that the first number you see on your tax form tells the entire story.

If something looks wrong — especially if your cost basis appears to be zero — stop and investigate before filing your return.

And if you're unsure, work with a qualified tax professional.

Should You Sell or Hold Your RSUs?

This is where personal financial planning becomes particularly important.

There's no universal answer to whether you should sell your RSUs immediately or hold them for the long term.

Instead, I recommend creating a process that connects your RSU decisions to your goals.

The biggest mistake is allowing your emotions to make the decision for you.

If the stock is going up, you may feel like you should hold forever.

If it's falling, you may panic and sell.

Neither reaction is necessarily a sound strategy.

Instead, consider three broad approaches.

1. Sell Immediately

If you don't have a strong conviction in your employer's stock, selling when shares become available can be a very reasonable strategy.

You can then use the proceeds to:

• Build your emergency fund
• Pay down debt
• Fund short-term goals
• Invest in a diversified portfolio
• Save for a home
• Increase retirement contributions

The key idea is diversification.

Once you've already earned the compensation, you don't necessarily need to keep taking additional risk by holding the same company's stock.

2. Hold With Conviction

If you have strong confidence in the company's long-term prospects, you may decide to hold some shares.

But conviction shouldn't mean ignoring risk.

Your employer is already connected to your financial life because it provides your paycheck, benefits, and potentially future equity grants.

If you also have a huge percentage of your investment portfolio invested in the same company, you've created significant concentration risk.

3. Use a Hybrid Strategy

You don't have to choose between selling everything and holding everything.

A hybrid approach allows you to sell some shares while retaining others.

For many people, this can be a psychologically easier strategy because you're diversifying while still maintaining some exposure to potential future upside.

Watch Your Concentration Risk

One simple rule of thumb I often use as a starting point is to consider keeping your employer stock to around 10% or less of your investable assets.

That's not a universal rule, and the appropriate percentage depends on your circumstances, risk tolerance, goals, and financial position.

But the underlying principle is important:

Don't allow one company's stock to become so large that a major decline could derail your financial plan.

Imagine you have:

• $500,000 in employer stock
• $200,000 in retirement accounts
• Other assets that are relatively small

If your employer's stock falls 50%, you've potentially lost $250,000 of wealth.

That's not just an investment problem. It could change your retirement plans, home-buying plans, or other major financial goals.

Diversification helps reduce the impact that any single company can have on your financial future.

A Simple RSU Decision Framework

When deciding what to do with newly vested shares, ask yourself:

Do I have low expectations for the stock?

Consider selling and diversifying.

Do I have extremely high expectations for the stock?

You may decide to hold some shares, but establish a limit so your position doesn't become dangerously concentrated.

Do I think the stock will perform about average?

Selling may actually make sense.

Why?

If you expect the stock to perform roughly like other investments, you can potentially pursue similar expected returns through a more diversified portfolio without taking on as much company-specific risk.

I'm not sure what I think.

That's okay.

A hybrid approach can allow you to sell some shares and hold some shares while you develop a more intentional strategy.

The important thing is to make the decision before emotions take over.

For a deeper framework for deciding what to do with new and existing RSUs, check out the RSU Strategy Guide from Level Up Financial Planning.

When Should You Get Help With Your RSUs?

RSUs can become complicated quickly.

You may have:

• Multiple grants
• Different vesting schedules
• Trading windows
• Significant tax implications
• Concentration risk
• Retirement goals
• Home-buying goals
• Other investments
• Stock options or an ESPP
• Complex tax situations

At some point, you may decide you'd rather spend your time enjoying your life than trying to figure all of this out yourself.

That's completely reasonable.

I've had many clients come to me when their RSUs started becoming a significant part of their net worth. They wanted to understand the tax implications, determine how much stock they should keep, and figure out how to turn their equity compensation into actual progress toward their financial goals.

If you're afraid to make a move with your RSUs because you're worried about making a costly mistake, that's a good reason to seek professional guidance.

Key Takeaways

RSUs can be an incredible wealth-building tool, but they work best when you understand what you're actually receiving and have a plan for managing them.

Here's what I want you to remember:

• Understand whether your RSUs are from a startup or publicly traded company.
• Know your vesting schedule and any cliffs.
• Don't treat hypothetical startup valuations as guaranteed wealth.
• Remember that publicly traded RSUs can change substantially in value before they vest.
• Understand your company's trading windows and blackout periods.
• Expect taxes when publicly traded RSUs vest.
• Remember that your tax withholding may not equal your final tax liability.
• Track your cost basis carefully after your RSUs vest.
• Don't accidentally pay taxes twice because your cost basis wasn't reported correctly.
• Create a sell/hold strategy before your emotions make the decision for you.
• Pay attention to concentration risk as your employer stock grows.

Most importantly, remember that RSUs aren't just about stock.

They're a tool that can help you build the life you want — whether that's financial independence, a home, early retirement, more flexibility at work, or simply greater financial confidence.

The goal isn't necessarily to maximize the value of your RSUs.

The goal is to use them intentionally to build the financial life you actually want.

Want More Help With Your RSUs?

If you're a tech professional trying to make sense of RSUs, stock options, ESPPs, 401(k)s, backdoor Roths, taxes, and all the other moving pieces of your financial life, you're not alone.

I've created two free resources to help:

• RSU Strategy Guide — a deeper look at strategies for managing new and existing RSUs, diversification, concentration risk, and more.
• RSU Tax Calculator — estimate the federal tax impact of your vested RSUs, including withholding, estimated taxes, and net value after taxes.

You can also schedule a complimentary conversation to explore whether working with a comprehensive financial planner who specializes in helping tech professionals would be a good fit.

My goal with these resources is simple: help tech professionals take their financial confidence to the next level.

— Lucas Casarez, CFP®, Founder of Level Up Financial Planning