Use this worksheet to enter information for the Elderly or Disabled credit. The information you enter is automatically carried either to Schedule R, if you are filing Form 1040, or to Schedule 3, if you are filing Form 1040A.
This way you can wait to decide which 1040 series to use or change your mind without having to complete more forms.
For information on this credit, see these related topics.
Tax Tips Credit for the Elderly or Disabled
IRS Instructions Schedule R and Schedule 3