Had you settled for a job just to have one? And have been able to finally find another job midyear? you may have overwithheld Social Security tax.
If your pay from two or more different employers exceeds the Social Security withholding limit of $106,800,
you can claim a credit on your return for any excess Social Security tax withheld.
Your employers each pay Social Security on wages of up to $106,800, with no offset. Unfortunately the same goes for employees who work for two or more federal agencies in a year.