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FICA was not withheld from my paycheck
According to this section in Publication 15:  Collecting underwithheld taxes from employees.   If you withheld no   income, social security, or Medicare taxes or less than the correct   amount from an employee's wages, you can make it up from later pay to   that employee. But you’re the one who owes the underpayment.   Reimbursement is a matter for settlement between you and the employee.   [...] it seems that if the employer withheld less than the correct amount of FICA taxes from you, it is still the employer who owes your FICA taxes to the government, not you. I do not believe there is a way for you, an employee (not self-employed), to directly pay FICA taxes to the government without going through the employer. The employer can deduct the underwithheld amount from you future paychecks (assuming you still work for them), or settle it with you in some other way. In other words, you owe the employer, and the employer owes the government, but you do not directly owe the government. If they do deduct it from your future pay, then they can issue a corrected W-2, to reflect the amount deducted from you. But they cannot issue a corrected W-2 that says FICA were deducted from you if it wasn't.