In 2015 I was overpaid $1,177+ by my college employer, which I repaid in 2016; so what form is used or how do I input this credit into my 2016 Turbo Tax (to be e-filed)?

You are able to claim a deduction for the amount that you repaid during 2016.

For repayments of less than $3,000:

• Federal taxes - Deductions & Credits - Check for More Tax Breaks - Other Deductions & Credits - Show more - Other Deductible Expenses
• When you get to the screen that shows Less Common Expenses, click Yes
• Enter a description and amount that you repaid; click Continue