Tax Planning

Restricted stock units (RSUs) can be a meaningful source of wealth, particularly if you work for a growing or publicly traded company. The challenge is that the tax treatment isn’t always intuitive, and it’s easy to underestimate what you’ll owe until tax season arrives.

The good news is that you can plan for this. When you understand how RSUs are taxed and take a few proactive steps during the year, you can avoid surprises and make more deliberate decisions about how this equity can support your broader financial goals.

How RSUs Work

RSUs are a form of compensation where your employer grants you the right to receive company stock (or sometimes cash) once certain conditions are met, typically staying with the company for a set period or meeting performance goals. Unlike stock options, there’s no purchase required. When the units vest, the shares are delivered to you.

Most companies use a multi-year vesting schedule, often with quarterly or annual vesting after an initial cliff or service requirement. At each vesting date, the value of those shares is determined by the stock price at that time, and that amount is treated as taxable income.

This is where many people get caught off guard, as the income shows up on your paycheck and affects your overall tax picture.

How RSUs Are Taxed When They Vest

RSUs are taxed as ordinary income when they vest, regardless of whether you hold or sell them. The fair market value of the shares at vesting is treated as “supplemental wages” and shows up on your W‑2, just like a bonus.

That vesting amount is subject to:

• Federal income tax withholding
• Social Security and Medicare (FICA)
• State and possibly local income taxes, depending on where you live

For federal income tax, employers generally follow IRS supplemental wage rules:

• 22% withholding on supplemental wages up to $1 million in a calendar year
• 37% on supplemental wages above $1 million

This flat rate is only a withholding method, not necessarily your true marginal tax rate. If you’re in a higher tax bracket, which is common for professionals with significant equity compensation, your actual tax owed may exceed what was withheld.

Common Ways to Cover RSU Withholding Tax

When RSUs vest, your employer typically uses one of several methods to collect the required withholding taxes. The specific approach is dictated by your company’s plan, but the most common methods are:

• Sell to cover. A portion of your newly vested shares is automatically sold to cover estimated taxes, and the remaining shares are deposited into your brokerage account. This often feels “automatic” and convenient, since you don’t have to write a check. However, it doesn’t guarantee that enough tax has been withheld for the year.
• Same‑day sale (cash out). All vested shares are immediately sold, the company withholds the estimated taxes, and you receive the remaining cash. This can help with cash flow if you have near‑term goals or want to avoid concentrated stock risk.
• Cash withholding / share delivery. Your employer withholds the tax due from your regular paycheck or asks you to pay cash, and you receive all of the vested shares in your account. This preserves your full equity position but increases your exposure to the company’s stock.

Most employers default to a variation of sell‑to‑cover or net share settlement, unless you make a different election. Whichever method your company uses, it’s important to remember: the withholding is just an estimate based on IRS rules—not a guarantee you’ve paid the “right” amount of tax for the year.

Why RSU Withholding Often Falls Short

Because RSU income is treated as supplemental wages, most employers use the IRS flat rate for federal withholding. For many mid‑ to high‑income earners, this flat 22% rate is lower than their actual marginal tax rate, which can easily land in the 24–35% range (or higher).

This gap is a common reason people with RSUs end up with a tax bill they didn’t anticipate. Consider a simplified example:

• If 1,000 RSUs vest at $100 per share, you’ve added $100,000 of ordinary income.
• At a 22% withholding rate, only $22,000 might be withheld.
• If your marginal tax rate is 35%, your actual federal liability on that income alone is $35,000 dollars, leaving a $13,000 shortfall.

Other factors that can make under‑withholding more likely include:

• A spouse or partner’s income
• Prior RSU vests and bonuses in the same year
• Investment income and side‑business income
• Changes in filing status or deductions

The IRS can charge underpayment penalties if your combined withholding and estimated payments don’t meet safe‑harbor thresholds. It’s best to avoid these if possible, since penalties have become more expensive as interest rates have risen.

Options If Your RSU Withholding Isn’t Enough

If you notice your RSU income is pushing your tax bill higher than what was withheld, you generally have three ways to close the gap over the year instead of waiting for an April surprise.

1. Increase withholding from regular paychecks. You can adjust your Form W‑4 so your employer withholds more tax from your regular wages. This approach spreads the extra tax over each paycheck and is often the easiest to implement.
2. Make quarterly estimated tax payments. If your income is variable, or you prefer more control, you can send estimated tax payments to the IRS and, if applicable, your state each quarter. This route requires more tracking and discipline but can be very effective, especially if your RSU vests are large or clustered in certain quarters.
3. Pay the difference when you file. You can choose to do nothing during the year and simply pay any shortfall when you file your tax return. This may work if the gap is small, but if the shortfall is significant, you may face penalties and a large lump‑sum payment—neither of which feel great.

Often, the best solution is a combination: slightly higher paycheck withholding plus modest estimated payments during heavy vesting years.

Best Practices for Managing RSUs Thoughtfully

For many professionals, especially those in tech, finance, or high‑growth industries, RSUs can represent a meaningful share of total compensation. To integrate them smoothly into your financial life, consider these best practices:

• Know your vesting schedule and values. Track upcoming vesting dates, the number of shares expected to vest, and a reasonable estimate of what those shares may be worth. This allows you to plan ahead for both taxes and cash flow.
• Avoid over‑concentration in company stock. It’s easy to let vested shares accumulate, especially when things are going well at work. Yet holding too much of your net worth in a single stock can increase risk and tie your income and wealth to the same company. It’s generally wise to set a maximum percentage of your investable assets you’re willing to hold in company stock and rebalance periodically.
• Set a default “sell versus hold” policy. Instead of making each vesting decision in the moment, decide in advance how you’ll handle new shares. For example, you might choose to sell a set percentage at vest to cover taxes and diversify, while keeping the rest within your agreed‑upon concentration limit.
• Coordinate RSUs with your broader plan. RSU income can be a powerful way to accelerate progress on long‑term financial objectives. Aligning your equity decisions with your values and goals helps you use this compensation intentionally, not reactively.
• Document everything. Save your vesting statements, trade confirmations, and year‑end tax forms (W‑2, 1099‑B, etc.) so you and your tax preparer can accurately calculate any capital gains when you eventually sell.

A Simple RSU Planning Routine

To make RSU planning feel more manageable, it can help to use the same basic steps each year.

1. Forecast your RSU income
   • List your upcoming vest dates and expected share counts.
   • Apply a conservative stock price to estimate how much taxable income those vests might create.
2. Compare your projected tax to withholding
   • Look at your paystub and equity portal to see your RSU withholding method and rate.
   • Compare the expected withholding (for example, 22% federal) to your estimated marginal tax rate for the year.
   • Identify any likely shortfall early.
3. Decide how you’ll handle the gap
   • Adjust your W‑4, schedule estimated payments, or do a mix of both so you stay ahead of potential underpayment.
   • Consider directing part of your vest proceeds to a separate “tax and goals” savings account to avoid accidentally spending them.
4. Set your sell/hold rules and revisit annually
   • Choose a default approach to selling and diversifying, along with a cap on company stock concentration.
   • Revisit these decisions at least once a year, or sooner if your stock’s performance or personal circumstances change.

RSUs and Your Financial Plan

RSUs are more than just another line on your paystub. For many hard-working women, they’re part of your life story: the late nights, the risks you’ve taken in your career, and the future you’re building for yourself. When you understand how RSU withholding works and proactively plan for taxes, you give yourself permission to enjoy the rewards of your hard work instead of worrying about what might happen next April.

If you’d like help weaving your equity compensation into a clear, values‑aligned financial plan—one that supports your independence, your goals, and the life you want to live—consider partnering with Curtis Financial Planning. We understand the nuances of RSUs and can help you turn complex equity decisions into a simple, repeatable strategy that works for you. Connect with us to learn more.