Form W-2 mistakes happen — a transposed Social Security number, an incorrect wage amount, a missing box. What matters is how fast you correct them. The IRS penalty for a wrong W-2 starts at $340 per form, and it accelerates the longer you wait.
Here is when you need a W-2c, how to file it correctly, and how it interacts with California's own reporting requirements.
What is a W-2c?
Form W-2c, Corrected Wage and Tax Statement, is the form you use to correct an error on a previously filed W-2. It is filed with the Social Security Administration (SSA) — not the IRS directly — and a copy is provided to the employee.
You generally need a W-2c when any of these are wrong:
- Employee name or Social Security number
- Federal, state, or local wages
- Federal income tax or Social Security / Medicare withholding
- State wages or state income tax withheld
- Any other dollar amount on the form
If only the employee's address is wrong, you do not need a W-2c — just issue a corrected copy to the employee.
When you must file
There is no "grace period" for a known error. The IRS expects you to file the W-2c as soon as the mistake is discovered. For the current year, the SSA generally accepts W-2c filings through the year and into the following year.
Timing matters because penalties are tiered:
| When corrected | IRS penalty per W-2c |
|---|---|
| Within 30 days of the due date | Up to $60 per form |
| 31 days late through August 1 | Up to $130 per form |
| After August 1 | Up to $340 per form |
| Intentional disregard | Up to $680 per form |
Note that these are maximums — but the "after August 1" tier is the one that jumps to $340, which is where the headline number comes from. Late or missing W-2s (not just corrections) carry the same penalty structure.
How to file a W-2c
The mechanics are straightforward, but the order matters:
- 1. Identify every field that was wrong on the original W-2.
- 2. Complete Form W-2c showing the correct information.
- 3. If only federal corrections are needed, file W-2c with the SSA (electronically or by mail).
- 4. Attach Form W-3c (Transmittal of Corrected Wage and Tax Statements) when filing by mail.
- 5. Furnish Copy B, C, and 2 to the employee so they can amend their own return if needed.
The SSA prefers electronic filing, and for employers filing large volumes it is required. Electronic filing through the SSA's Business Services Online (BSO) portal is free.
Federal and state are separate corrections. Filing a W-2c with the SSA does not correct your California reporting. You must also correct the employee's state wage record with the EDD.
California: W-2c and the DE 9C
California's counterpart to the W-2 is the DE 9C (Quarterly Contribution and Wage Report). If you correct federal wages, you usually need to correct the corresponding state wage report as well.
- File an amended DE 9C for the quarter(s) affected.
- Correct the employee's state wages and California income tax (PIT) withheld.
- Reconcile against your DE 6 / DE 88 payments so that EDD records match.
- Adjust SDI, UI, and ETT contributions if the corrected wages affect those.
Also update the employee's W-2 Copy 1 (state copy) so their state record reflects the corrected figures.
What gets corrected most often
| Error | Correction needed |
|---|---|
| Wrong SSN | W-2c + amended DE 9C |
| Overstated wages | W-2c + amended DE 9C |
| Failed to report a fringe benefit | W-2c, plus possible prior-period withholding |
| Wrong state income tax withheld | W-2c + amended DE 9C |
| Duplicate W-2 issued | Do not issue W-2c — contact SSA to void |
Penalties at a glance
- IRS: Up to $340 per W-2/W-2c after August 1; up to $680 for intentional disregard.
- SSA: Electronically filed corrections are free, but repeated paper filings may incur fees.
- EDD: Penalties and interest can apply for inaccurate or late DE 9C filings, plus assessment of any underpaid contributions.
- Employees: A late or wrong W-2 can trigger an employee's own amended return — and the cost of your error.
W-2c compliance checklist
- ☐ Identify the exact error and the field(s) affected
- ☐ Prepare Form W-2c with the correct information
- ☐ Attach Form W-3c if filing by mail
- ☐ File with the SSA (electronic preferred)
- ☐ File an amended DE 9C for the affected quarter(s)
- ☐ Reconcile DE 88 payments against corrected wages
- ☐ Furnish Copies B, C, 2, and 1 to the employee
- ☐ Document the correction and retain for your records
Three things drive the $340 penalty risk: the error itself, the delay, and forgetting the state side. Correct fast, file the W-2c and the amended DE 9C, and update the employee — that is the full loop.
Need help correcting W-2s or California wage reports? Glendale Payroll Inc. handles W-2c filings, DE 9C amendments, wage statements, and California compliance filings for small businesses across Glendale and Los Angeles. Reach out for a free consultation.