I had the same problem as nbbapat and lmtaylor3319. Using Premier, desktop version for Mac, the amount of my extension payment did not automatically populate to the 1040. I was on the phone with TurboTax support, who were no help, when I discovered that I could in fact edit line 9 of the Tax Payments Worksheet which fixed the problem. It seemed like TurboTax was not letting me edit values in forms mode until I quit and relaunched TurboTax.
