Understanding IRS Penalties for Incorrect W-2 form Depending on how serious the error is and how soon it is fixed, filing the wrong W-2 form can result in significant IRS penalties. If not corrected right once, common mistakes such incorrect employee names, Social Security numbers (SSNs), wage amounts, or tax withholdings might result in fines. Errors corrected within 30 days of the filing deadline result in smaller fines, but repairs made after this time or not at all result in heavier penalties. Penalties are tier-based. For More : https://a2autocare.com/article/filed-incorrect-w2-form-in-quickbooks/