Example or actual filer reference: Form revision checked: Line 1 legal name / address / contact verified: Line 2 TIN source and nine-digit formatting: Line 3 underlying return method: Line 4 multiple-payer list, if applicable: Line 5 prior initial extension reference, if applicable: Line 6 exact form selection: Line 7 actual qualifying facts, if applicable: Signature requirement / authority: Deadline source / current route / final version: