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Margaret, other than the larger font, the other main difference on the 1040-SR is that the chart for the higher standard deduction is printed on the form itself instead of "see instructions," presumably to cut down on errors for those folks that are still preparing paper returns by hand. The 1040-X is the form used for amending all the 1040 series of returns including 1040-SR. It says so right in the form's instructions.