I use TurboTax Premier on my personal computer. I've filed my return for 2021. I have a question on the Estimated Tax Payment Options worksheet available in this application. How does Turbo Tax determined my 2022 estimated taxable income in this worksheet?
Using the info you enter in the system it basically computes the 2022 return to determine the estimates required.
The worksheet called "Estimated Tax Payment Options" is only one of the estimated taxes worksheets. The other one is called "Estimated Taxes and Form W-4 Worksheet" which shows the income figures used.
However, the best thing to do is to first go through the Estimated Taxes interview in the step-by-step mode, where you can fine tune your choices, choose a method of calculation, etc. and then look at the worksheets afterwards, if you wish. Here's how: