If TurboTax is telling you specifically that your first employer is the one who owes the refund they may have actually calculated your withholding wrong or made an error on your Form W-2.
To calculate your correct Social Security Tax withholding manually:
- Use your reported Social security wages from box 3 on your W-2
- Multiply that number by the Social Security Tax rate of 6.2%
- The total should match the amount in box 4
Based on your original question and subsequent posts I think it must be wrong. Regardless of whether it was misstated or miscalculated, your employer is responsible for correcting the Form W-2 and refunding you the excess withheld if that was the case.
See Topic No. 608 Excess Social Security and RRTA Tax Withheld for more specifics from the IRS.
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