Copied from the Journal of Accountancy:
"When reporting total Social Security wages paid to an employee on Form W-2, Wage and Tax Statement, employers who deferred the employee portion of Social Security tax should include any wages for which the employers deferred withholding and payment of employee Social Security tax in box 3, “Social Security Wages,” and/or box 7, “Social Security Tips.” Employers should not include in box 4, “Social Security Tax Withheld,” any amount of deferred employee Social Security tax that has not been withheld.
Employee Social Security tax deferred in 2020 under Notice 2020-65 that is withheld in 2021 and that was not reported on the 2020 Form W-2 should be reported in box 4, “Social Security Tax Withheld,” of Form W-2c, Corrected Wage and Tax Statement. On Form W-2c, employers should enter tax year 2020 in box c and adjust the amount previously reported in box 4 of the Form W-2 to include the deferred amounts that were withheld in 2021. All Forms W-2c should be filed with the Social Security Administration, along with Form W-3c, Transmittal of Corrected Wage and Tax Statements, as soon as possible after the employer has finished withholding the deferred amounts. These rules will be in the 2021 General Instructions for Forms W-2 and W-3 (which will be published in January 2021). The IRS says that Forms W-2c should also be furnished to employees."
Having to file a W-2c for every employee who has deferred a portion of their 2020 SS, which then is withheld in 2021 is just insane! What a mess!
I am so glad I don't have any payroll clients who are doing this.