TurboTax automatically calculates the correct amount of Retirement Savings Contributions Credit based on your (presumably correct) inputs. If you made at least $2,000 of retirement contributions (after subtracting any retirement-account distributions you made after 2013) and your AGI is low enough to place you in the 50% credit range, you would receive a $1,000 credit. At higher levels of AGI the credit reduces to 20%, then 10%, and finally disappears altogether.
See IRS Pub 590-A regarding this credit:
https://www.irs.gov/publications/p590a/ch03.html
