2026 filing countdown: the documents most often missing

A practical final inventory for income forms, deductions, dependents, estimated payments, and business records.

What to do this week

1. 1

   Compare every expected form with what you received.

2. 2

   List missing items by source and owner.

3. 3

   Upload readable copies to the secure portal.

How to use this field note

Use the checklist to organize records and identify the question that needs attention. Confirm deadlines and federal requirements against the linked official source. State, local, entity-specific, and fact-specific rules may differ.