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I've learned that based on the CARES act my employer chose to defer their SS and Medicare tax payment on a group life insurance policy (taxable income).    (found on the W-2 they sent- boxes 12b had code M and box 12c had code N. 

Does this mean the employee is impacted filing taxes? 

Does this mean that I will receive a W-2c for 2020 next year and that I will need to file a corrected 2020?  or even 2021 ?  since the CARES act allows employers under certain conditions to also defer payment to 2022 in some cases.