Schedule 5 is Other Payments and Refundable Credits: <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-pdf/f1040s5.pdf">https://www.irs.gov/pub/irs-pdf/f1040s5.pdf</a>
Did you enter the estimated quarterly payments in TurboTax (see instructions in the edit)? If it doesn't show up on line 17 and in Schedule 5 it seems like it wasn't saved/entered and not used to calculate your refund. You will have to amend the return.
