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How to Respond to a 30‑Day or 90‑Day IRS Audit Letter

A concise, actionable checklist for assembling documents, communicating with the IRS, and meeting response deadlines.

IRS audit letter
IRS LETTER | January 15, 2026 | Advisor

Receiving a notice from the IRS can feel intimidating. This guide walks you through the exact steps to collect evidence, craft a response, and stay compliant with the 30‑day or 90‑day deadline.

1. Identify the Letter Type

  • 30‑Day Letter – Typically a request for clarification or missing documents.
  • 90‑Day Letter – Often a notice of intent to levy or assess additional tax.

2. Assemble Required Records

Use our premium checklist to gather:

  • Original invoices, receipts, and bank statements.
  • Payroll logs, W‑2/1099 filings, and employee contracts.
  • Prior year tax returns and supporting schedules.

3. Draft a Precise Response

Your response should include:

  1. Letter reference number and tax period.
  2. Clear statement addressing each IRS query.
  3. Attached supporting documentation (indexed).
  4. Contact information for follow‑up.

4. Submit on Time

Mail certified with return receipt, or submit electronically via the IRS portal. Keep a copy of the envelope and tracking number.

5. Follow‑Up & Escalation

If you do not receive acknowledgment within 7 days, call the IRS toll‑free number listed on the notice. Consider engaging a qualified tax attorney for 90‑day levy threats.