How can I review and edit estimated 2024 taxes in my completed 2023 return?

[jmtroup]

2023 was a year of transition since I worked until retiring September 1.  2024 income will be a lot less, and I want to confirm that has been accounted for.

[NCperson]

this website would do the trick as it is set for 2024:

https://www.dinkytown.net/java/1040-tax-calculator.html