IRS Form 4549

What Form 4549 is and who sends it

Form 4549, Report of Income Tax Examination Changes, is how an IRS examiner puts the results of an audit on paper. The IRS manual (IRM 4.10.8, revised August 28, 2025) calls it “the basic report form for most individual and corporate income tax cases” and says it “reflects adjustments to taxable income and the corrected tax liability.” It also says audit reports, unlike the examiner’s workpapers, “are legally binding documents” and “serve as the basis for assessment and collection action.”

Every kind of audit uses it. It usually arrives with a cover letter:

Related versions you may see:

• Form 4549-A is the same report “Without Taxpayer Signature.” The manual uses it for no-change, unagreed field, excepted agreed, refund-claim and abatement cases, usually paired with Form 870, the waiver you would sign to agree.
• Form 4549-E, Income Tax Discrepancy Adjustments, is used by the Tax Exempt and Government Entities division to adjust a related individual or corporate return after one of its exams (IRM 4.70.15).
• “For Information Only” on a Form 4549 means it proposes no change in tax; such reports are usually tied to offers in compromise or internal requests.

Reading the report, part by part

The blank form isn’t published on IRS.gov, and layouts differ by software, but the IRS manual describes what each report contains. Read it from the top down with your return beside it:

The reasons are not on Form 4549 itself. They are in the attached explanations: standard paragraphs, lead sheets or Form 886-A, Explanation of Items. Read those line by line, because that is where any appeal is won or lost.

Penalties and interest on the report

The most common audit penalty is the accuracy-related penalty under IRC 6662, generally 20% (IRS.gov, 2026) of the part of the underpayment it applies to. The manual warns examiners that written supervisory approval of penalties subject to IRC 6751(b) “must be obtained timely or the related penalties cannot be asserted.” Reasonable cause and good faith can remove it; see penalties and payment options after an audit.

Interest is generally figured from the return’s due date. The rate is the federal short-term rate plus 3 percentage points, reset quarterly (7% (IRS.gov, Jul-Dec 2026) this quarter). Publication 3498 (Rev. 5-2025) says that if you pay when you sign, interest is generally calculated to the date of payment, and that a bill under $100,000 (IRS.gov, 2026) paid within 21 calendar days adds no more interest or penalties (10 business days at or above that amount).

What signing Form 4549 means

The IRS manual is direct: Form 4549 “allows for a taxpayer signature, waiving restrictions on assessment and collection of a deficiency or acceptance of an overassessment. By signing, the taxpayer is indicating they do not wish to exercise appeal rights with regard to the adjustments reflected in the report.” IRC 6213(d) is the law that lets you waive those restrictions.

• No notice of deficiency for the signed items. The IRS can assess the tax and bill you, usually with a CP14, without the 90-day Tax Court letter.
• Joint returns need both signatures to be processed as agreed, unless the deficiency is paid in full. If only one spouse signs, unagreed procedures apply to the other.
• No conditions. The manual says “conditional statements will invalidate an agreement.” Don’t write notes next to your signature.
• Fax is accepted. The IRS can accept a signed Form 4549 by fax.
• Interest relief if the IRS is slow. Under IRC 6601(c), if the IRS doesn’t send notice and demand within 30 days after you file the signed waiver, interest stops from day 31 until it does.
• It still has to be accepted. The report is subject to review by the Area Director, and a closing letter such as Letter 987, Agreed Income Tax Change, confirms acceptance.
• Refunds come faster. If the report shows an overassessment, Publication 3498 says you should get the refund sooner if you sign.

Agreeing with only part of the report

You can accept some adjustments and dispute others. In partially agreed cases the manual tells examiners to prepare two versions of Form 4549-A plus a waiver:

• Form 4549-A “Agreed” shows only the adjustments you accept and the agreed deficiency. You sign Form 870 for that amount.
• Form 4549-A “Total” shows all proposed adjustments but only the remaining unagreed deficiency, which goes to Appeals or, if unresolved, to a notice of deficiency.

Ask the examiner for this split before the response date. Office audits may instead use Form 4549 itself for unagreed cases, in which case no separate waiver is needed.

Your options at a glance

Our guides to agreeing or appealing and the 30-day letter explain each route and how to ask for more time.

How to respond to Form 4549

1. Find the response date in the cover letter, not on the form.
2. Compare each adjustment with your return, your records and the explanation. Mark each line agree or disagree.
3. Check penalties and math. Ask which penalty applies and why, and redo the tax computation.
4. Call the examiner with questions or new documents before the date. You can ask for a conference with the examiner’s manager.
5. Sign only what you accept, or ask for the partial-agreement forms.
6. For the rest, send a small case request or protest to the address on the letter. Our cover letter template helps when you send documents.
7. Keep copies of everything signed and proof of when you sent it.

What happens next

If you agreed, expect a closing letter and a bill. If you can’t pay it all, pay what you can and set up a plan; see can’t pay the tax from an audit. If you didn’t agree, you get a 30-day letter if you don’t have one already, then possibly a notice of deficiency. If you find records after signing and the tax is still unpaid, audit reconsideration may reopen the case.

Mistakes to avoid

• Signing to make it go away. You give up Appeals and the prepayment Tax Court route for those items.
• Reading only the bottom line. The explanations show whether the examiner misunderstood a fact.
• Ignoring penalties. A penalty can sometimes be removed even when the tax change is right.
• Letting the date pass. Silence leads to a notice of deficiency with a 90-day deadline the IRS can’t extend.

Doing it yourself, free help, and representation

A one-item report that matches your records is often simple to sign or dispute alone. A representative adds more when penalties are proposed, several years are involved, the amount needs a formal protest, or you plan to agree in part.

• Low Income Taxpayer Clinics help eligible taxpayers with audits and appeals for free or a small fee (find a clinic).
• Taxpayer Advocate Service: free help for hardship or stuck cases, 877-777-4778 (IRS.gov, 2026).

Global Gate Tax Relief offers a free consultation, reviews the report and your IRS transcripts before recommending anything, and quotes a flat fee upfront if it takes the case. No outcome is guaranteed. Request a free review of your Form 4549 or call 1-877-800-8180.

Frequently asked questions

Keep reading in the IRS Audit Guide

• IRS audit letters explainedEvery audit letter and form in one lookup table.
• The 30-day letterYour choices and deadline after the report arrives.
• Form 886-AThe explanation of each adjustment.
• Agree or appeal?How to decide whether to sign.
• Can't pay the audit billPenalty relief and payment options.