RSU Tax Withholding: Why 22% Isn't Enough When You Earn $150k+

For high earners in the United States, receiving Restricted Stock Units (RSUs) can be a lucrative benefit, but it also comes with complex tax implications. The default tax withholding rate for RSUs is 22%, which is the supplemental income tax rate. However, for individuals earning $150,000 or more, this rate often falls short of their actual tax liability, potentially leading to underpayment penalties. In the 2025 tax year, the federal income tax brackets range from 10% to 37%, with the top bracket applying to taxable income above $609,350 for single filers and $731,200 for joint filers.

Understanding RSU Taxation

RSUs are a type of equity compensation that vest over a specified period, at which point they are considered taxable income. The value of the RSUs at vesting is reported as ordinary income on the employee's W-2 form. The 22% withholding rate is applied to this income, but for high earners, their actual tax rate may be significantly higher. For example, an individual with a taxable income of $250,000 may be subject to a federal income tax rate of 35% or 37%, depending on their filing status and other factors. Additionally, they may also be subject to state and local income taxes, which can range from 0% to over 13%, depending on the state and locality.

Consequences of Underwithholding

If the 22% withholding rate is insufficient to cover an individual's actual tax liability, they may face underpayment penalties when they file their tax return. The IRS requires taxpayers to make estimated tax payments throughout the year if they expect to owe more than $1,000 in taxes. Failure to make these payments can result in penalties and interest on the underpaid amount. For high earners, this can be a significant issue, as the underpayment penalty can be as high as 45% of the underpaid amount. To avoid this penalty, individuals can make estimated tax payments using Form 1040-ES, which is due on a quarterly basis.

Calculating Actual Tax Liability

To determine their actual tax liability, high earners should consider all sources of income, including RSUs, salary, bonuses, and investment income. They should also take into account any deductions and credits they may be eligible for, such as the mortgage interest deduction, charitable contributions, and the child tax credit. For example, an individual with a salary of $200,000, RSU income of $50,000, and investment income of $20,000 may have a total taxable income of $270,000. Using a tax calculator or consulting with a tax professional, they can estimate their federal income tax liability, which may be around $90,000, assuming a tax rate of 33%. Additionally, they may be eligible for tax-deferred savings opportunities, such as a 401(k) or IRA, which can help reduce their taxable income.

Strategies for Managing RSU Tax Liability

High earners can take several steps to manage their RSU tax liability and avoid underpayment penalties. One strategy is to make estimated tax payments throughout the year, using Form 1040-ES. Another approach is to consider tax-deferred savings opportunities, such as a 401(k) or IRA, which can help reduce taxable income. Individuals may also want to explore other tax planning strategies, such as a backdoor Roth IRA conversion or a solo 401(k) plan, which can provide additional tax benefits. For example, an individual with a high income may be able to contribute to a solo 401(k) plan, which can help reduce their taxable income and lower their tax liability.

Using an RSU Calculator

An RSU calculator can be a valuable tool for high earners to estimate their tax liability and determine the optimal withholding rate. These calculators take into account the individual's income, tax filing status, and other factors to provide an estimate of their tax liability. By using an RSU calculator, individuals can avoid underpayment penalties and ensure they are withholding enough taxes throughout the year. For example, an individual with a salary of $250,000 and RSU income of $100,000 can use an RSU calculator to estimate their tax liability and determine the optimal withholding rate. They may find that they need to withhold an additional 10% to 15% of their RSU income to avoid underpayment penalties.

High earners who receive RSUs should carefully consider their tax implications and take steps to manage their tax liability. By understanding the tax implications of RSUs, estimating their actual tax liability, and using an RSU calculator, individuals can avoid underpayment penalties and ensure they are in compliance with IRS regulations. To get started, visit our RSU calculator to estimate your tax liability and determine the optimal withholding rate for your situation.