IRS notice guide

Form 4564: the information document request, explained

Written by CompDefend. Founded by Umair Nazir, EA — Enrolled Agent, federally licensed to practice before the IRS. Last updated 2026-08-23.

Form 4564, the Information Document Request (IDR), is the written list an IRS examiner uses to ask for specific records during an examination of your business. It arrives with or after the audit letter, names the documents wanted, and carries a due date the examiner writes on the form itself — there is no fixed statutory deadline. Respond completely, in organized copies, by that date, or ask for more time in writing before the date passes.

Form 4564 in brief

An IDR is a request, not a summons. It is the normal way an examiner asks for records once an examination is open.
The due date is whatever the examiner writes in the form’s Information Due By field. The form prints no day-count; IRS examiner guidance says only that the form “must always include a date for submission.”
When sending records, send organized copies and never mail originals. Key every document to the request’s item numbers and return Part 2 of the form with your reply.
Ignoring an IDR does not end the request. The examiner can treat the items as unsupported, contact third parties after written notice, or compel the records with a summons under IRC 7602.
An IDR is a live test of your records system. How fast you can produce what it asks for is a direct measure of your business’s defensibility.

Form 4564 at a glance

What it is: Information Document Request (IDR): the examiner’s written list of records needed to test specific items in an open examination.
Why it was sent: Your return is under examination and the examiner needs source documents for the items selected. The first IDR is mailed with the initial contact or appointment letter; later IDRs follow as issues develop.
Who receives it: Any taxpayer whose return is under examination — sole proprietors, S corporations, partnerships, C corporations, and employers examined for employment tax.
Tax type involved: Whatever return is under examination: income tax (Forms 1040, 1120-S, 1065, 1120) or employment tax (Forms 941, 940). The Subject field names the issue.
Deadline: Set by the examiner in the Information Due By field, or “At Next Appointment.” No statutory day-count exists; IRS guidance requires only that the form include a submission date, and that date controls.
If it is ignored: Unsupported items are disallowed in a proposed examination report. The examiner may also issue a follow-up request, send third-party-contact notice (Letter 3164), or compel the records with a summons under IRC 7602.

What an IDR is, and why you received one

An IDR turns the questions in an examination into a list you can act on. The audit letter or appointment letter opens the examination; Form 4564 names the records the examiner wants in order to test the items selected. Under the Small Business/Self-Employed (SB/SE) division’s current examiner guidance, the first IDR is mailed with the initial contact letter in an office examination and generally with the appointment confirmation letter in a field examination. Later IDRs follow as issues develop.

The examiner is not allowed to ask for everything. The same guidance, issued in September 2025 after a Treasury Inspector General review of taxpayer burden, says requests “must be specific, and must avoid requesting more information than is essential to resolve the issues identified,” and should not ask for returns the IRS already holds. A proper item names the record type, the activity, and the period. The form is one page in three parts (Part 1 your copy, Part 2 returned with your reply, Part 3 the case file), and its fields tell you more than the list does.

Fields on Form 4564 and what they tell you
Field	What it means for you
Subject	The issue being tested — cost of goods sold, officer compensation, a specific deduction. Match your response to it; do not send records for items not named.
Dates of Previous Requests	Filled in only when the examiner is asking a second time. If populated, your first response is already considered incomplete.
Description of documents requested	Read each item for record type, activity, and period. An item missing one of the three deserves a clarifying question.
Information Due By	The examiner-set due date, with “At Next Appointment” and “Mail in” checkboxes. The only deadline on the form.
From	The examiner’s name, title, employee ID number, office, and telephone. Verify against the audit letter before sending anything.

How serious it is

An IDR is routine inside an examination; the examination is the serious part. The IDR is where the examiner’s questions become evidence, or the absence of it, and the finding will be built from what you send. The Taxpayer Advocate Service’s page on the audit letter puts the consequence plainly: “If you don’t respond by the due date, the items in question will be disallowed and an examination report will be sent showing the proposed tax changes.”

The deadline: what the IRS actually states

There is no statutory response period for an IDR. The deadline is the date in the Information Due By field, and the SB/SE guidance requires only that “the Form 4564 must always include a date for submission of the requested information or documents.” In the Large Business and International (LB&I) division, which examines large corporations, the manual says examiner and taxpayer should “determine a reasonable timeframe for a response”; failing agreement, “the examiner or specialist will set a reasonable response date.” That negotiation is formal only in LB&I cases, but it is worth asking for in any examination, in writing. For an examination conducted by mail, the IRS audit page adds that on written request it “can ordinarily grant you a one-time automatic 30-day extension.” Ask before the date, not after.

What to gather

Gather by IDR item, not by what is on hand

The audit letter and every IDR received, with request numbers and due dates logged in one place.
The return under examination and the workpapers behind each line named: schedule, ledger detail, source documents.
Bank and credit card statements for the periods requested, plus the month before and after if asked (the IRS’s own model request does).
Source documents by item: invoices, receipts, contracts, canceled checks, loan agreements, mileage logs, payroll registers.
For owner items in an S corporation, the compensation record: payroll filings, minutes, and any reasonable compensation analysis on file.
A written list of anything requested that does not exist or cannot be located, with the reason.
Current IRS account transcripts, so you know what the examiner already sees.

How to respond

A response the examiner can use

Confirm the sender.Match the name, employee ID number, and telephone on the From block to the audit letter. The IRS does not initiate an examination by email or text; once a mailed audit contact has opened the case, verify any follow-up against the assigned examiner and the communication channel you agreed to use.
Ask for clarification, and for time, in writing.If an item lacks a record type, activity, or period, or reaches beyond the Subject, ask what it is meant to test. If the date is unworkable, say why and propose a specific date before it passes. Keep copies.
Send copies; never mail originals.The IRS instruction is direct: “Never mail original records. Send us copies.” Keep the originals and a full duplicate of exactly what you sent.
Organize by request item.Label each document with the request and item number. The IRS’s advice for audits is to organize records “by year and type of income or expense, and include a summary of transactions.” A one-page index mapping items to documents does more for you than any argument.
Write a short cover letter and return Part 2.State what is enclosed item by item, note items that do not exist or are still being located, and include Part 2 as the form asks. Do not argue the merits here; the question at this stage is factual.
Prove delivery, then confirm.Use the method the examiner specified; for mail, a tracked method. Follow up to confirm receipt and ask whether the response satisfied the request.

Over-producing and under-producing

Two opposite mistakes cost businesses here. Under-producing reads as a gap and invites a second request. Over-producing slows the review, and every extra document can raise a question the examiner did not have. Answer each item completely, answer only the items asked, and say in writing when an item cannot be answered.

Three ways a response goes wrong
Problem	What it looks like	What it costs
Under-producing	Partial items; summaries instead of source documents; missing periods	Items treated as unsupported; a follow-up IDR; in LB&I cases, entry into the enforcement track
Over-producing	Unrequested years, unrelated accounts, personal records mixed with business	A longer review; new questions; disclosure of matters outside the Subject
Unlabeled producing	Documents with no index tying them to item numbers	The examiner’s reconstruction of your records becomes the working record instead of yours

What happens next, procedurally

After you respond, the examiner accepts the item, proposes an adjustment, or issues another IDR. If you do not respond, or respond incompletely, the path is also procedural and documented.

Follow-up request. A second Form 4564 for the same records, with the earlier date in Dates of Previous Requests — the examiner building a record that you were asked twice.
Disallowance. Unsupported items are disallowed and an examination report issues with the proposed changes. You keep your appeal rights, but you are now defending a finding instead of answering a question.
Third-party contacts. Under IRC 7602(c), the IRS may not contact banks, customers, or others about your liability without first sending written notice (Letter 3164) at least 45 days before a contact period of up to one year. You may request a list of the parties contacted.
Summons. IRC 7602(a) authorizes the IRS to examine “any books, papers, records, or other data which may be relevant or material” and to summon you to produce them. The IRS summons manual reserves it for when a taxpayer “will not produce the desired records or other information voluntarily,” and the LB&I manual adds that if a taxpayer says records will not be provided without a summons, “the IRS should move directly to issue a summons.” A summons (Form 2039) is enforceable in federal court; an IDR is not.

In LB&I examinations this escalation is a mandatory sequence — delinquency notice, pre-summons letter, summons — with response windows the manual describes as “generally” 10 business days each. Small-business examinations have no published ladder; the examiner’s judgment controls.

What an IDR reveals about your records system

Strip away the examination and an IDR is a simple test: can your business produce the source documents behind a line on its return, for a named period, by the stated due date, without reconstructing them? Scattered records can turn a supportable item into an incomplete response. The receipt may exist in a former bookkeeper’s email, or the owner’s salary may have a sound basis that no one documented.

The three layers, applied to an IDR
Layer	What it requires	How the IDR tests it
Legal requirement	IRC 6001: every person liable for tax “shall keep such records” as the Secretary prescribes. IRS retention guidance: at least three years for most income tax records, four for employment tax records.	The request asks for records the law already required you to keep. “I no longer have it” is an admission, not a defense.
Substantiation expectation	The IRS expects you to show the evidence behind a position when examined, organized “by year and type.”	The Description field is a substantiation demand: proof, not explanation.
Defensibility control	Not law: an indexed records system, a month-end close that attaches source documents to entries, a written compensation analysis, reading the IRS account between filings.	What lets you answer in days instead of weeks, and keeps a second IDR from being issued.

That third layer is where CompDefend works. The free Business Tax Assessment scores records and substantiation as one domain of business tax defensibility and names gaps an IDR could expose: contractor files without a W-9, payroll deposits that cannot be tied to a schedule, or owner pay with no written basis. For an S corporation, documented officer-compensation analysis is one important support file to create before anyone asks.

When to involve a CPA, EA, or attorney

A straightforward IDR — a few items, documents you can locate, an issue you understand — can be answered by the owner or the regular bookkeeper. Bring in a representative under Form 2848 (power of attorney, which is different from the read-only Form 8821) when the Subject is worker classification, officer compensation, unreported income, or basis; when a requested record does not exist or contradicts the return; when you receive a second request, a Letter 3164, or any mention of a summons; or when you want the request narrowed. If the records suggest exposure beyond an accuracy adjustment, that is a question for an attorney, whose privilege is broader than a CPA’s or EA’s. A representative speaks for you, but the records are still yours to find.

What to gather now

The audit letter and every IDR received, with request numbers and due dates logged
The return under examination and the workpapers behind each line named
Source documents for each item: invoices, receipts, contracts, canceled checks, bank statements, payroll registers
A written list of requested items that do not exist or cannot be located
Current business account transcripts, so you know what the examiner already sees

What to do now

Verify the examiner on the From block against the audit letter
Calendar the Information Due By date and request more time in writing if it is unworkable
Ask in writing for clarification of any item missing a record type, activity, or period
Assemble copies for submission, indexed to each item number, and never mail original records
Return Part 2 of the form with the reply, keep a full duplicate, and confirm receipt

Bring in a CPA, EA, or attorney under Form 2848 when the Subject is owner compensation, worker classification, unreported income, or basis; when a requested record does not exist; or at any second request, Letter 3164, or mention of a summons.

Where CompDefend fits — and where it does not

What CompDefend does

Scores your records and substantiation posture free, as one domain of the Federal Tax Defensibility Index, and names gaps an IDR could expose.
Monitors supported business modules (Forms 1120-S, 941, and 940) weekly under a Form 8821 authorization and surfaces examination activity recorded on the account.
Produces a documented reasonable compensation study for S-corporation owners — the record an officer-compensation IDR asks for.
Explains the examination process in plain English so you can brief your representative with the right facts.

What CompDefend does not do

Read or receive IRS letters, including IDRs. Radar reads account activity, not mail. Owner Form 1040, partnership Form 1065, and C-corporation accounts are outside its scope.
Represent you before the examiner or respond to an IDR on your behalf. Form 8821 permits reading information only.
Prepare or file returns, or give individualized legal advice on an open examination.
Predict whether any return will be examined, or promise any examination outcome.

See where your business stands

Once this request is answered, the useful question is how the rest of your records would hold up to the same test. The free assessment scores the domains an examiner can reach — records, payroll, contractors, owner pay — and returns your Federal Tax Defensibility Index with the weak spots named.

Check My Business Tax Defensibility