RSU Tax Planning: What to Know Before Your Shares Vest

Most people remember waiting for their first vest. Far fewer have decided what they’ll do when it arrives.

Shares show up in the account, the number looks good, and the next move gets made by default. Sell some, hold the rest, sort out taxes later. Over a few years, that default can become the largest unplanned position on the household balance sheet.

For established families and seasoned investors, the mechanics of RSUs and options are the easy part. The harder part is deciding what the compensation is for, and how much of your financial life you’re comfortable having tied to one employer. Settle that, and the questions about timing and tax get easier. We don’t provide tax advice, and treatment varies by plan and household, so the details below are worth taking to your CPA.

How Are RSUs Taxed When They Vest?

Q: Why does the tax bill on an RSU vest surprise people?

A: With most RSU arrangements, the value of the shares becomes taxable as ordinary income when they vest and are delivered to you, whether or not you sell them. Your employer usually withholds a portion, often by holding back shares, but withholding and what you actually owe are two different numbers.

Employers commonly withhold federal income tax on supplemental wages at a flat 22 percent, although other methods may apply. Above $1 million in supplemental wages in a year, the mandatory rate is 37 percent. As an illustration only: on a $100,000 vest, 22 percent withholding is $22,000. If all of that income falls in a 35 percent marginal bracket, the federal tax is closer to $35,000, leaving a $13,000 gap. State income tax and payroll taxes add to it.

The bigger problem is what happens before the bill arrives. People see the shares in the brokerage account and start making spending decisions based on that balance, without knowing what they’ll ultimately owe. We’d much rather have the tax conversation before the money is committed to something hard to undo.

Once the shares are delivered and taxed as compensation, your cost basis is generally the value included in your income. Sell right away and there’s usually little additional gain or loss. Hold them, and later price changes produce capital gains or losses, with long-term treatment generally requiring a holding period of more than a year.

One detail worth checking: the basis your brokerage reports on its tax form may not reflect the income already on your W-2. If it doesn’t, you can end up paying tax twice on the same compensation unless the basis is corrected.

Start With What Your Equity Compensation Is For

Q: What’s the most common mistake besides taxes?

A: Not deciding what the proceeds are meant to do. People spend years anticipating the first vest and arrive without a plan. Paying down debt, building investments outside the company, buying a home, creating room to change jobs: each points to a different answer on how much to sell and when.

Q: Should I plan around this vest or the whole pipeline?

A: The whole pipeline. Most people focus on what’s vesting now. We’re usually more interested in the next three or four years: the original grant, annual refreshers, promotions, and whatever the share price does in between. Equity compensation tends to grow into a much larger part of the household’s finances than expected, and seeing it laid out lets you line it up with a home purchase, tuition, a business, or an earlier retirement.

It also shapes career choices, quietly. Once there’s a meaningful amount of unvested stock, it’s common to start counting what you’d leave behind, and to stay in a job longer than you’d like because another vest is coming. Sometimes the opportunity being passed up is worth more than the stock being waited on.

RSUs vs. Stock Options: Why Tax Timing Matters

Q: How does stock options tax strategy differ from RSU planning?

A: With RSUs, the vesting schedule sets the taxable event. With options, you often choose when it happens, which makes timing a decision.

With NSOs, the spread at exercise is generally ordinary income, so the question is mostly when to exercise and how to fund it. ISOs generally don’t create regular income tax at exercise, but the spread can count toward the alternative minimum tax, depending on your income, deductions, and how much you exercise. Selling the shares in the same calendar year as the exercise generally avoids that AMT adjustment, though it also gives up the favorable ISO treatment.

To get that treatment, ISO shares generally must be held more than two years after grant and more than one year after exercise. Meet both and the appreciation generally qualifies for long-term capital gain rates. Sell sooner and part of the gain is typically taxed as ordinary income.

Holding ISO shares through a falling stock to protect favorable tax treatment is a trap we’d steer people away from. Tax treatment is one input to the decision. Some families spread exercises across several tax years and ask their tax professional to model AMT before each one.

At private companies, early exercise and Section 83(b) elections can add planning opportunities and risks. An 83(b) election generally applies to restricted stock, not RSUs, and must ordinarily be filed within 30 days of the transfer. Get professional guidance before relying on one.

How Much Company Stock Is Too Much?

Q: Is there a right amount of employer stock to hold?

A: There’s no universal number, and we’re wary of anyone who offers one without seeing your full picture. Some planners use a single-digit or low-double-digit percentage of investable assets as a reference point. Your circumstances may justify more or less.

What moves the answer is how many things are already tied to the same company: your salary, your bonus, your unvested grants, your career prospects, and a good portion of your investments. Company stock can fall at the same moment your job feels uncertain.

Try this. If your employer had paid you in cash instead, would you have put all of it back into the company? Holding vested shares is that same decision, made again every day. Believing in your company and diversifying can coexist. Selling can feel like giving up on something you helped build, which is why people understand the case for diversifying and still struggle to act on it.

When Should You Sell Your RSUs?

Q: How should I decide when to sell?

A: In advance. If your plan is to sell “when the price is right,” you don’t yet have one. When the stock rises, people hold for more. When it falls, they hold for a recovery. Set a rule before the next vest, while the stock is quiet: sell at every vest, sell on a schedule, or keep a defined amount.

Your Equity Compensation Planning Checklist

Q: What should I work through before the next vest or exercise window?

A: Some families find it useful to put these in writing, since the answers affect each other:

• What will this vest or exercise cost in tax, and how will it be paid? Withholding, estimated payments, and cash on hand all play a role.
• Which shares have the lowest and highest basis, and which have crossed the long-term holding period?
• Does the basis your brokerage reports match the income on your W-2?
• Are there blackout windows or insider restrictions that limit when you can sell?
• What major financial decisions do you expect over the next three to five years, and what will they cost?
• If you give to charity, would donating appreciated shares make sense in place of cash?
• If your company’s stock doubled tomorrow, what would you do differently? What if it fell by half?

That last question tells us the most. Some people have already mentally spent gains they haven’t realized. Others are counting on future appreciation to fund commitments they’re making now.

Conclusion

Most people already accept that concentration is a risk. Where it gets difficult is the timing. When the stock is climbing, people hold because they might miss more. When it’s falling, they hold because it may come back. Either way there’s a reason to wait, and the waiting can go on for years.

That’s the argument for deciding on paper, early, while no vest is pending and the stock isn’t making the decision for you. If you’d like to do that with us, we’re glad to look at your vesting schedule alongside everything else.

FAQ

Q: Should I sell RSUs as soon as they vest?

A: Many families find that a sensible default. The value has already been taxed as ordinary income, so holding adds new market risk on top of money you’ve effectively received. Keeping shares is a separate investment decision and deserves its own reasoning.

Q: Do ISOs always trigger the alternative minimum tax?

A: No. It depends on the size of the spread, your other income, and your deductions that year. A tax professional can model it before you exercise.

Q: What if a vest lands during a blackout window?

A: The tax is still due, even if you can’t sell shares to pay it, and withholding may cover only part. Employees subject to trading restrictions may be able to set up a Rule 10b5-1 trading plan that allows sales during blackout periods. These plans must meet specific SEC requirements, including cooling-off periods before trading can begin, and should be coordinated with company counsel.

Sources

• IRS Publication 525, Taxable and Nontaxable Income
• IRS Publication 15, Employer’s Tax Guide (supplemental wage withholding)
• IRS Instructions for Form 6251, Alternative Minimum Tax

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Disclosures

This content is for informational purposes only and does not constitute financial, tax, or legal advice. Investment strategies involve risk and may not be suitable for every investor. Please consult your financial advisor, tax professional, or attorney regarding your specific situation. Watts Gwilliam & Company, LLC is a Registered Investment Advisor with the U.S. Securities and Exchange Commission (SEC). Registration does not imply a certain level of skill or training.