Deductions & credits

You don't get prompted.  If you are using the Turbo Tax online version it automatically gives you the 1040SR if you or your spouse is 65 or older.  It may show the regular 1040 on the screen but if you print it should be the 1040SR.

In the Desktop program it will give you the 1040SR but you can select which one to use.  You can switch to forms and the Info Wks part II has a selection to select 1040SR or not.