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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →A surprise RSU tax bill usually means your employer’s tax withholding was lower than your final tax liability—not that the vest was tax-free or that a 22% withholding rate was your final tax rate. For 2026, employers may use a flat 22% federal withholding method for qualifying separately identified supplemental wages up to $1 million; the withholding rule for the portion above that threshold is 37%. Your final tax depends on your full return. You can reduce the chance of a shortfall by estimating your full-year tax and adjusting payroll withholding or making estimated payments when appropriate.
Why an RSU vest can leave you with a tax bill
When RSUs vest or settle, the value treated as compensation is generally included with your wages for federal income-tax purposes. Payroll withholding is a prepayment toward your eventual tax bill. It is not a calculation of your final tax based on all your income, deductions, credits, and payments for the year.
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Employers may treat qualifying RSU compensation as supplemental wages for withholding. Under the IRS’s 2026 employer guidance, an optional flat 22% federal income-tax withholding method can apply to qualifying separately identified supplemental wages up to $1 million. The portion above that threshold is subject to a 37% withholding rule. Those rates describe withholding—not the tax rate you will owe on the income. See the IRS Publication 15 (2026), Employer’s Tax Guide.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteIf your overall tax on the year’s income is higher than the amount withheld, you may owe the difference when you file. The amount withheld can also depend on how the employer processes the compensation and your payroll elections. Check your pay statements and vest or settlement records rather than assuming a particular rate was applied.
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Estimate the full-year picture before changing payments
Build an estimate using your expected wages, RSU compensation, other income, deductions, and credits. Then subtract federal income tax already withheld and any estimated payments. The goal is to compare expected total tax with expected payments—not to apply a withholding percentage to the RSUs in isolation.
The IRS’s general 2026 estimated-tax test applies when you expect to owe at least $1,000 after withholding and credits and expect payments to be below the smaller of 90% of your current-year tax or 100% of your prior-year tax. The prior-year percentage is 110% for certain higher-income taxpayers. The test, exceptions, installment rules, and penalty calculations depend on individual facts and timing; consult the current IRS Publication 505 (2026), Tax Withholding and Estimated Tax and applicable forms.
These are federal rules. State and local income taxes, work-location sourcing, nonresident status, and other circumstances can change what you owe. Federal guidance alone cannot determine the result for a particular employee.
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Choose how to address a projected shortfall
| Approach | How it works | What to check |
|---|---|---|
| Increase payroll withholding | Ask payroll whether you can adjust withholding from remaining paychecks. This can spread payments across the rest of the year. | Employer options, the amount of remaining wages, and how many pay periods are left. Revisit the estimate if income or withholding changes. |
| Make estimated tax payments | Pay the IRS directly based on your full-year estimate and payment timing. | Applicable installment amounts and deadlines in current IRS instructions. A payment made late may not resolve an earlier-period shortfall. |
Use the current-year IRS forms and instructions to calculate amounts and deadlines. The general estimated-tax thresholds do not, by themselves, establish what you personally should pay.
Keep the compensation event separate from a later stock sale
A later sale of vested shares is a separate tax event from the compensation recognized when the shares vested or settled. Report a disposition under the applicable Schedule D and Form 8949 rules, and reconcile the sale proceeds with the compensation already included and the correct basis. Do not assume a brokerage tax form has resolved every basis adjustment: the records available here establish the reporting framework, but not every RSU-specific 1099-B scenario. The IRS provides general stock-sale context in its Stocks (options, splits, traders) FAQ; option details there are not RSU rules. For broader income context, see IRS Publication 525 (2025) and use current forms and publications when filing.
Selling shares or keeping them is an investment decision. Selling does not erase compensation income already recognized at vest or settlement. Consider concentration risk, personal risk tolerance, and any employer trading restrictions separately from how you make tax payments.
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Section 83(i) is a limited exception, not a general RSU fix
Section 83(i) can permit certain employees in qualifying private-company plans to defer federal income inclusion, but it has eligibility requirements and a limited deferral period. It is not a general solution for public-company RSUs. The IRS discusses the provision in Publication 15-B (2026), Employer’s Tax Guide to Fringe Benefits. Whether a plan and employee qualify requires a review of the specific facts.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsRecords and details to gather
- Grant, vesting, and settlement notices showing dates, share counts, and values.
- Pay statements and your Form W-2 to check compensation and withholding reported by payroll.
- Brokerage statements and tax forms for any share sales, along with records needed to reconcile basis.
- Your state and local residence and work locations, any nonresident status, and relevant employer plan terms.
- Other income, deductions, credits, estimated payments, and prior-year tax information needed for a full-year estimate.
If your situation involves multiple states, nonresident taxation, or plan-specific questions, consider getting qualified tax advice. The federal publications above do not settle those individual issues.
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