Guide

The IRS letter: read the code, calendar the date, call the CPA

Summary

When an IRS letter arrives, do not ignore it and do not panic-call the number on it before you understand it. Read the notice number and what it actually asks, calendar the response deadline printed on the letter the day it arrives, pull the records that support the line in question, and route it to your CPA or an enrolled representative. Most notices are routine correspondence, not a field audit — but every one has a clock.

By Gale Editorial · Updated 2026-07-27. Every figure cited to a dated source. How we write.

The first hour: read it, calendar it, do not panic

When an IRS letter arrives, the first hour is about triage, not answers. Read the whole notice and find its number, usually printed in a corner, because that code tells you what kind of letter it is. Note the tax year and the exact item in question. Most letters are routine correspondence — a proposed adjustment or a request for a document — not a field agent at the door 1.

Resist two impulses: ignoring it, which forfeits your rights when the response window closes, and firing back immediately before you understand what it asks. A calm, documented reply on time beats a fast one. The IRS conducts reviews by mail, in an office, or in the field, and the notice itself tells you which track you are on 1.

Identify the notice and what it actually asks

Different letters need different responses, so name the notice before you act. A math-adjustment or underreporter notice proposes a specific change and a new balance; an examination notice opens a review of one or more items; a balance-due notice asks for payment. Each states the year, the amount, and what it wants from you. Matching your response to the notice type is the difference between resolving it and reopening it.

The item in question also tells you what drew attention. A mismatch between a 1099 you received and what you reported, an outsized deduction, or a loss-heavy Schedule C are among the irs audit triggers that generate letters. Knowing which one you are answering keeps your reply narrow: respond to the line the IRS raised, not to the whole return 1.

Calendar the deadline the day it arrives

Every IRS notice carries a response deadline, and it is the single most important line on the page. Calendar it the day the letter arrives, and work backward from it. Miss it and you can lose the right to dispute the change, agree by default to the proposed balance, or push the matter to a harder, more expensive stage. The date on the letter controls — not the date you got around to opening it 1.

If you need more time, most notices explain how to request it, and asking before the deadline is far better than missing it. Build in a buffer: give your CPA or representative enough runway to review the notice, pull records, and draft a reply, rather than handing it over the day before it is due.

Pull the records that support the line in question

The response the IRS wants is evidence, so gather the documents that back the item it questioned. If a deduction is at issue, that means receipts, invoices, and the log or statement behind it; the IRS's own recordkeeping guidance sets what to keep and for how long — generally three years, six for substantial under-reporting, and four for employment-tax records 2. Audit-ready books make this a retrieval task instead of a reconstruction.

Match the record to the item. A depreciation question turns on the asset schedule and the election you made 3. A payroll or contractor question turns on your withholding, deposits, and worker agreements 4, and on whether a 1099 worker meets the common-law test for contractor status 5. Send copies, keep originals, and include a short cover note that ties each document to the line the notice raised.

When the letter is not from the IRS

Not every official envelope is a tax notice, and the routing differs. A payer's takeback letter or a Medicare records request asks you to justify billed services, not filed taxes — a different process with different deadlines and appeal rights. Read the letterhead first: an overpayment demand from a health plan and a payer audit follow the contract and the payer's own policy, not the Internal Revenue Code.

When a payer or Medicare reviews documentation, the record that matters is clinical. Every note should be authenticated by signature, and a missing signature can sometimes be cured by attestation during review 6. If a billed code is questioned, the definitive references are the AMA's CPT code set, updated each year 7, and, for telehealth, the CMS list of services payable by telehealth that year 8. Route a tax notice to your CPA and a payer or Medicare letter to whoever handles your billing — they are not the same queue.

Respond in writing, and know when to bring in help

Answer in writing, on time, and only to what was asked. A concise, documented reply resolves most correspondence notices without escalation. Keep a copy of everything you send and proof of the date you sent it. If you agree with a proposed change, the notice explains how to accept and pay; if you disagree, it explains how to respond or appeal — follow that path rather than calling and hoping to talk it away.

Bring in a CPA, enrolled agent, or tax attorney early when the dollars are large, when several years are open, or when a notice threatens collection. Ask whether penalties can be waived — first-time abatement and reasonable-cause relief exist for taxpayers with a clean history — and understand that an unanswered balance can escalate to a levy, including the federal payment levy that can reach Medicare payments. That escalation is exactly when professional representation earns its fee.

Common questions

Read the whole notice, find its number, and note the tax year and the exact item it questions. Then calendar the response deadline the day the letter arrives. Do not ignore it and do not fire back before you understand it. Most letters are routine correspondence, and a calm, documented reply on time resolves the majority of them.

Not usually. Many notices are automated — a proposed math adjustment, an underreporter notice, or a balance due — rather than a full examination. The notice number and its wording tell you which. A correspondence notice asks for a document or proposes a change by mail; an examination notice opens a review. Identify the type before assuming the worst.

A missed deadline can cost you the right to dispute the change or push the matter to a harder stage, so act as soon as you realize it. Many notices explain how to request more time or how to respond late; do that immediately and loop in your CPA. The sooner you re-engage, the more options usually remain open.

For anything beyond a simple clarification, respond in writing and keep a copy with proof of the date sent. A written, documented reply that answers only the item raised creates a record and avoids the misunderstandings a phone call invites. If the matter is large or threatens collection, have your CPA or an enrolled representative handle the correspondence.

No. A health plan's overpayment demand or a Medicare records request follows the payer's contract and policy, not the tax code, with its own deadlines and appeal rights. Route a tax notice to your CPA and a payer or Medicare letter to your billing process. Answering one as if it were the other wastes the clock that matters.

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References

  1. 1.Internal Revenue Service (2026). IRS audits. Internal Revenue Service. link ✓How IRS reviews are conducted by correspondence, office, or field, and the taxpayer rights and response process that attach to a notice.
  2. 2.Internal Revenue Service (2026). Recordkeeping. Internal Revenue Service. link ✓Which records to keep and for how long — generally three years, six for substantial under-reporting, four for employment-tax records.
  3. 3.Internal Revenue Service (2026). Publication 946, How To Depreciate Property. Internal Revenue Service. link ✓That a depreciation question turns on the asset schedule and the Section 179 or MACRS election made.
  4. 4.Internal Revenue Service (2026). Understanding employment taxes. Internal Revenue Service. link ✓That a payroll question turns on withholding, deposits, and the employer's employment-tax records.
  5. 5.Internal Revenue Service (2026). Independent contractor (self-employed) or employee?. Internal Revenue Service. link ✓That a contractor question turns on whether the worker meets the common-law test for contractor status.
  6. 6.Centers for Medicare & Medicaid Services (2023). Complying with Medicare Signature Requirements. CMS Medicare Learning Network (MLN905364). link ✓That Medicare requires notes to be authenticated by signature and that attestation can cure a missing signature in review.
  7. 7.American Medical Association (2026). CPT® (Current Procedural Terminology). American Medical Association (AMA). link ✓That CPT is the AMA-maintained procedure code set, updated annually, and the reference when a billed code is questioned.
  8. 8.Centers for Medicare & Medicaid Services (2026). List of Telehealth Services. Centers for Medicare & Medicaid Services (CMS). link ✓That CMS publishes the annual list of codes payable as Medicare telehealth, the reference when a telehealth code's payability is questioned.

https://www.gale.care/for-providers/irs-audit-letter-first-moves · 8 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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