Wrong Social Security # on W2

[jhillman0425]

My son's employer has the wrong social on his W-2. He will be contacting employer to get a corrected W-2C however, my question is if this was the wrong soc sec # all year, where did this withholding $ go? Will there be a penalty fed/state for taxes not paid during year for him?  Did the paid taxes get applied to someone else with "wrong" soc sec #.  Will this withheld taxes ever get applied to his soc? 

[TomK100]

Your son can sign-up for an account at http://socialsecurity.gov.  One of things that he (or anyone who has worked) can do there is "View Earnings Record" for every year since he began working.  If his income does not show for 2019, contact social security and explain the situation.