Deductions & credits

The paystub shows the withholding (for medicare, social security, federal and state income taxes).  And yes, I received $8K approximately and paid back $14K.

 

Should I do both of the steps you mentioned or do I do one or the other depending on some circumstance?: 

1) Report employer to IRS (where can I do this?), file a W-2 substitute (also how should I do this? Is this another form on TT?)

2) File a claim for the FICA refund using Form 843 -- is this still part of the tax returns process & how can I use turbotax in addition to filing this refund? 

 

Thank you so much-- I'm so new to this and every bit of information is super helpful!