As of today, if you have not started your new tax return with filling out an extension within Turbo Tax and just skipped this step, and then inputted a bunch of data, there is no way to pull in your payment and have it be part of the calculations. - Well, at least I wasn't able to do that for half a day and wasted 3 days amount editing. Then I got a tip from a dear friend who was an accountant for his entire life and suggested to start a new tax return and make an extension within the Turbo Tax with the payment amount at the very beginning.
So, if you skipped the extension at the beginning, you will have a hard time to follow other's answers.
Intuit should fix this and allow importing such an important document anytime or make it very easy to access. This is a software, which is sold for $120, should have the bar set high!!
