Complete Guide to Form W-2C Corrections for 2026

What is Form W-2C?

Form W-2C (Corrected Wage and Tax Statement) is used to correct errors on Form W-2, W-2AS, W-2CM, W-2GU, W-2VI, or W-2c that were previously filed with the Social Security Administration (SSA). When mistakes are discovered on an employee's W-2 after it has been submitted, employers must file Form W-2C to report the corrections.

The W-2C form has two columns: "Previously Reported" and "Correct Information". You only need to complete the boxes where corrections are being made. The form must be accompanied by Form W-3C (Transmittal of Corrected Wage and Tax Statements) when submitted to the SSA.

When Should You File Form W-2C?

File Form W-2C when you need to correct any of the following on a previously filed W-2:

• Employee's name or Social Security number
• Wages, tips, or other compensation (Box 1)
• Federal income tax withheld (Box 2)
• Social Security wages or tips (Boxes 3, 4, 5, 6, 7)
• Medicare wages and tax (Boxes 5, 6)
• Benefits information (Box 12 codes)
• Retirement plan checkbox (Box 13)
• State and local wage information (Boxes 15-20)

Note: You should also file W-2C if you discover an error after the employee has already filed their tax return. The employee may need to file an amended return (Form 1040-X) based on the corrected information.

Common W-2 Errors Requiring Correction

The most frequent mistakes that require a W-2C include:

1. Wrong Social Security Number: Transposed digits or incorrect SSN entered. This is one of the most common errors and can cause significant issues for the employee.
2. Incorrect Employee Name: Misspelled names, wrong legal name, or name changes that were not updated before filing.
3. Wrong Wage Amounts: Errors in Box 1 (wages), Box 3 (Social Security wages), or Box 5 (Medicare wages) due to calculation mistakes or data entry errors.
4. Tax Withholding Errors: Incorrect amounts in Box 2 (federal), Box 4 (Social Security tax), or Box 6 (Medicare tax).
5. Box 12 Code Mistakes: Wrong codes or amounts for retirement contributions, health insurance, or other benefits.
6. Retirement Plan Checkbox: Box 13 checkbox incorrectly marked or unmarked.

For a detailed list of common errors and how to avoid them, see our Common W-2 Errors guide.

How to Complete Form W-2C

Follow these steps to correctly fill out Form W-2C:

1. Enter employer information: Complete boxes a through f with your EIN, name, and address.
2. Enter employee information: Complete boxes e, f, and g with the employee's correct SSN, name, and address.
3. Identify the tax year: Enter the tax year being corrected in box c.
4. Complete only the boxes being corrected: For each box with an error, enter the amount "Previously Reported" and the "Correct Information" in the appropriate columns.
5. Leave unchanged boxes blank: Do not fill in boxes that were correct on the original W-2.

For box-by-box instructions, see our detailed Form W-2C Instructions guide.

Filing Form W-2C with Form W-3C

When you submit Form W-2C to the SSA, you must include Form W-3C (Transmittal of Corrected Wage and Tax Statements). The W-3C summarizes all the W-2C forms you are submitting and serves as a cover sheet.

Key points about Form W-3C:

• One W-3C is filed per batch of W-2C forms submitted together
• The W-3C totals should equal the sum of all accompanying W-2C forms
• If correcting multiple employees, use one W-3C for all W-2C forms

E-File Form W-2C with BoomTax

E-file your Form W-2C with the SSA using BoomTax. Our platform automatically generates the required W-3C transmittal form and handles corrections for multiple employees efficiently.

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Deadlines for Filing W-2C

Unlike the original W-2 which has a strict January 31 deadline, there is no specific deadline for filing Form W-2C. However, you should file corrections as soon as errors are discovered.

Best practices for timing:

• Before the employee files their tax return: File promptly so the employee has correct information
• If the employee has already filed: Notify them so they can file an amended return if needed
• If the SSA notifies you of an error: Respond and file corrections within the timeframe specified in their notice

Employee Notification Requirements

After filing Form W-2C with the SSA, you must provide a copy to the affected employee. The employee needs this information to determine if they must file an amended individual tax return.

Be sure to provide copies to employees promptly. If the correction affects their tax liability, they may need to file Form 1040-X (Amended U.S. Individual Income Tax Return).

Penalties for Not Filing W-2C

While there are no specific penalties for filing W-2C late, failing to correct known errors can result in:

• Penalties for filing incorrect information returns
• Potential issues for employees with the IRS or SSA
• Problems with Social Security benefit calculations for employees

For more information about W-2 related penalties, see our W-2 Penalties guide.

External Resources

• IRS: About Form W-2C
• IRS: Instructions for Forms W-2C and W-3C (PDF)