Audits (examination)

Letter 566 notice — Don't let this one sit

The opening letter of an audit by mail: the IRS has selected specific items on your return for examination and is asking for the documents that support them.

Don't sit on it

What this letter is

The opening letter of an audit by mail: the IRS has selected specific items on your return for examination and is asking for the documents that support them.

Why you got it: Returns are selected by formula, by mismatch with third-party data, or by related examinations. Selection is not an accusation; most mail audits close with no change or a small one when documents are complete.

What it is not

Not a bill, not a penalty, and not a conclusion. An audit letter is a request for evidence — how it ends depends largely on the paper you send back.

Your first move: Note the response date, list exactly what's being examined (only those items), and assemble copies that prove each one. Nothing more, nothing less.

Your deadline, counted

Every clock runs from this date — not from the day the letter reached you.

Your options, in the order most people should try them

1. Send complete documents

Organized, indexed to their list, copies only.

2. Send partial + a plan

What you have now, and a dated note for the rest — examiners note cooperation.

3. Ask what would settle it

Examiners can often say exactly which document closes an item.

Your rights on this letter

  • Ask for more time, and ask questions — the letter names your examiner contact.
  • Appeals review if you disagree with the report (Letter 525 stage).
  • Representation is allowed but rarely needed for a document audit; LITCs help those who qualify.

How to respond

Mail/fax to the address on the letter; certified mail or the upload tool where offered; keep the full packet.

Scam check

Audit letters are a top scam costume. Verify yours: the IRS audit shows in your account, and examiners never demand payment.

If you ignore it

The examiner decides on the record they have — which is to say, against you — and issues an examination report (Letter 525) proposing the tax, starting the 30-day Appeals clock.

Where this sits on the ladder: This letter stands on its own track — see the collection ladder for the enforcement road.

Included in the $39 IRSLetterDecoded Kit

  • The full response letter pack for this notice family
  • What to send — and what to NEVER send
  • The penalty-relief scripts and the payment-plan reality pages
  • Certified-mail proof discipline, start to finish

Get the Kit — $39, one time

One payment. No subscription. Yours to keep — every notice, every letter, every script.

Sources, checked 2026-10-19:
  • IRS — Letter 566 (initial contact letter)
  • IRS Publication 3498-A, The Examination Process