RSU Tax Withholding Strategies for High Earners

When your Restricted Stock Units (RSUs) vest, the value of those shares is taxed as ordinary income. For most people, the company automatically sells some shares to cover the taxes. However, the standard rule allows employers to withhold only 22% for federal taxes. If you are a high earner in the 32%, 35%, or 37% tax bracket, you are under-withheld by 10% to 15% on every dollar.

 

This creates a major problem. If you do not plan for this gap, you could face a huge tax bill in April. This guide explores RSU tax withholding strategies for high earners so you can plan ahead, avoid surprise bills, and know when a financial adviser could help.

 

Why You Owe Money After RSUs Vest

 

When RSUs vest, the IRS views them as "supplemental wages," just like a cash bonus. The IRS allows employers to withhold a flat 22% for federal income tax on supplemental wages up to $1 million (https://www.irs.gov/publications/p15).

 

However, your actual tax bracket is based on your total household income. If your regular salary plus your vested RSUs pushes you into a higher tax bracket, you still owe the IRS that extra percentage. The 22% is just a baseline - it does not reflect your true tax responsibility.

 

3 RSU Tax Withholding Strategies for High Earners

 

You have a few ways to fix this withholding gap before tax season arrives. A financial adviser can help you choose the best path for your specific cash flow needs.

 

1. Adjust Your Regular W-4 Withholding

 

One strategy is to increase the tax withheld from your regular, bi-weekly paychecks. You can submit a new Form W-4 to your HR department and request a specific extra dollar amount to be withheld each pay period. This slowly covers the shortfall from your RSUs throughout the year, meaning you do not have to write a large check to the IRS manually.

 

2. Make Quarterly Estimated Tax Payments

 

If your RSU vests are very large, adjusting your paycheck might not be enough. Instead, you can make estimated tax payments directly to the IRS four times a year.

 

When doing this, many high earners aim for the "Safe Harbor" rule. The IRS states that if your adjusted gross income was over $150,000 last year, you can usually avoid underpayment penalties by paying in 110% of the tax shown on your prior year's return (https://www.irs.gov/taxtopics/tc306). A financial adviser often works alongside a tax professional to calculate this exact target for you.

 

3. Set Aside Extra Cash from Your Vest

 

Most companies use a "sell-to-cover" method when your RSUs vest. This means they automatically sell 22% of your shares to pay the default withholding.

 

To cover the remaining tax gap, you could choose to sell additional shares immediately on the vesting date. You can put this extra cash in a savings account until tax time. This helps you pay your tax bill without needing to pull from your regular checking account.

 

For more about managing your RSUs, check out " When to Sell Your RSUs: A 5-Step Tax Strategy".

 

Do Not Forget About Payroll Taxes

 

Income tax is not the only thing withheld when RSUs vest. You also pay payroll taxes, like Social Security and Medicare.

 

For 2026, the Social Security wage base limit is $184,500 (https://www.ssa.gov/oact/cola/cbb.html). If your regular salary already hits this limit early in the year, you might not owe Social Security tax on late-year RSU vests. However, Medicare tax has no cap and applies to every vested dollar. Keeping track of these moving parts is a great reason to consult a financial adviser.

 

How a Financial Adviser Helps High Earners

 

An experienced financial adviser looks beyond just the tax forms. They look at your entire financial life to help you make informed decisions.

 

Managing Risk and Cash Flow

 

A financial adviser can help you decide whether to hold your remaining shares or sell them to diversify your investments. Holding too much company stock can be risky. Spreading your wealth across different types of investments can help protect your savings if your company's stock price falls.

 

Coordinating with Tax Professionals

 

A financial adviser can work directly with your CPA to project your tax liability for the entire year. This team approach can help you avoid surprises and keep your wealth building on track.

 

Frequently Asked Questions

 

Why is my RSU tax withholding only 22%?

The IRS treats RSUs as supplemental wages. The default federal withholding rate for supplemental wages under $1 million is 22%, regardless of your actual tax bracket.

 

Will I get penalized if I don't withhold enough on RSUs?

You might face an IRS underpayment penalty if you owe more than $1,000 at tax time and have not met the safe harbor requirements through withholding or estimated payments.

 

Can I ask my employer to withhold more than 22%?

Some companies and brokerage platforms allow you to choose a higher withholding rate for RSUs, but many do not. It is a good idea to check with your HR department.

 

Plan Your RSU Strategy Today

 

Relying on the default 22% withholding rate often leaves high earners with a stressful tax bill. By planning ahead, you can take control of your cash flow.

 

Schedule a call with a financial adviser today to build a custom tax and withholding strategy for your RSUs.