Read each IRS notice for its own period, explanation, and request. Assistance can clarify how letters relate without assuming that one response covers every year.
Keep each request identifiable
Preserve complete notices and enclosures, then locate the identifier and tax period in each one. Place relevant return or payment support beside the letter it helps explain. A more recent date does not by itself make older correspondence irrelevant, and similar subject wording does not establish that the requested action is identical. Note what remains unclear about an amount or instruction. Official IRS notice guidance is available below for general identification.
Define the response work
Ask which communication needs attention first and what information would support the actual request. Clarify service charges and who is responsible for preparation or delivery. Keep requested response dates visible while documents are collected. A gathered packet should be distinguished from evidence of something submitted. When further correspondence arrives, retain it with the related period so follow-up can explain what changed and which issue still requires review.