Possible Clues:

• First part of many forms
• First fill-in on many a form
• First field on a tax worksheet
• Top of a schedule, maybe
• Top thing filled in on an I.R.S. form
• Top part of an I.R.S. form
• Start of a tax form
• Top of an I.R.S. form
• First form fill-in, often
• Start of a schedule