Who needs it?
Employers who need to make corrections to a previously filed W-2 forms must submit Form W-2c with the accurate information. Do not file a W-2c form to correct only the address. W-2c should not be used for corrections to the W-2G form.
When to File it
File any corrected W-2 forms as soon as you realize a correction is required.
Electronically filed W-2C form is directly transmitted to the SSA from Tax1099.com system. SSA e-filed acceptance acknowledgment comes within 3 to 7 business days.