You do not have to find it. When you use TurboTax you are preparing a Form 1040 as soon as you start to enter your information. If you or your spouse is 65 or older your return will print out on Form1040SR when you print it. The 1040SR and Form 1040 are identical. The only difference is the 1040SR has bigger print and prints on three pieces of paper instead of two pieces. All of the lines and all of the calculations are exactly the same.