An IRS Tax Compliance Officer is a desk-based examiner who reviews filed tax returns to confirm the income, deductions, and credits you reported are accurate. If a letter tells you a Tax Compliance Officer (TCO) is looking at your return, you’re dealing with someone in the IRS Examination Division who will ask for supporting documents by mail or at a scheduled office meeting, then decide whether you owe more tax, less tax, or nothing beyond what you already paid.
TCOs don’t visit your home or workplace. They don’t call out of the blue. The work happens from an IRS office, and everything serious moves on paper.
What a Tax Compliance Officer Handles
TCOs take the less complex examinations. A typical case is confirming a claimed deduction has receipts behind it, checking that income on your return matches what employers and banks reported on W-2s and 1099s, or verifying a refundable credit like the Earned Income Tax Credit was calculated correctly. The returns involved are mostly individual Form 1040s, small sole proprietorships reported on Schedule C, and specific itemized issues like noncash charitable contributions on Form 8283.1Internal Revenue Service. Instructions for Form 8283 – Noncash Charitable Contributions
Two IRS jobs sound similar but aren’t. A Revenue Agent handles the complex examinations — corporations, partnerships, multi-entity structures — and travels to the taxpayer for field audits. A Revenue Officer works in Collections and shows up only after a tax debt has already been assessed and remains unpaid. The TCO sits in the middle: determining what, if anything, you owe on a targeted set of issues.
The TCO’s main tool for gathering records is the Information Document Request (IDR), a written list of exactly what the examiner needs.2Internal Revenue Service. New Process for Information Document Requests If a taxpayer refuses to cooperate, the TCO can issue a summons under Internal Revenue Code Section 7602 to compel records or testimony.3Office of the Law Revision Counsel. 26 U.S. Code 7602 – Examination of Books and Witnesses That power exists as a backstop; most examinations finish through voluntary document exchange.
The Letter You Received and What Happens Next
The IRS always opens an examination by mail. Not by phone, not by email. The first letter is typically Letter 566, and it identifies the tax year under review, the specific items being questioned, and your response deadline.4Taxpayer Advocate Service. Letter Notifying Taxpayer of Audit with Request for Additional Information Deadlines generally run 30 to 45 days from the date on the letter.5Taxpayer Advocate Service. Initial Contact Combined With 30-Day Letter and Report
Your case will run one of two ways:
- A correspondence audit happens entirely by mail. You get an IDR, you send copies of the requested documents back, and the TCO decides based on what you submit.
- An office audit means you or your representative meet the TCO at an IRS facility. This format is used when the volume of records or the nature of the issues benefits from in-person discussion.
The IDR controls the scope. If the TCO is examining Schedule C business expenses, the IDR will list specific records — bank statements, receipts, vendor invoices — for a defined period. Respond to exactly what the IDR asks for. Sending extra material that wasn’t requested can open new areas for the TCO to examine and turn a narrow review into a broader one.
For correspondence audits, you can submit records electronically through the Document Upload Tool at irs.gov/examreply instead of mailing paper.6Internal Revenue Service. Audit Reconsideration Process for Correspondence Examination Either way, send copies only. The IRS doesn’t return originals. Organizing your records so they map clearly to the line items on your return and the specific IDR requests shortens the whole process.
If you can’t meet the original deadline, contact the TCO right away and ask for more time. Extensions are usually granted when requested promptly. Ignoring the letter is the worst option: the TCO will make a determination from whatever information is already in front of them, and that determination almost always produces a bigger bill than the facts actually warrant.7Internal Revenue Service. Publication 3498 – The Examination Process
One protection worth knowing before you start pulling records: the IRS has an internal policy against repetitive audits of the same issues. If the same line items on your individual return were examined in either of the two preceding years and produced no change or only a small adjustment, those issues should generally be dropped from the current audit.8Internal Revenue Service. IRM 4.10.2 – Examination of Returns If you fit that description, raise it with the TCO.
Your Rights During the Examination
Every interaction with a TCO is governed by the Taxpayer Bill of Rights, ten protections set out in IRS Publication 1. They include the right to be informed about what the IRS is doing with your account, the right to quality service, the right to pay no more than the correct amount of tax, the right to privacy and to an examination no more intrusive than necessary, and the right to appeal any IRS decision.9Internal Revenue Service. Publication 1 – Your Rights as a Taxpayer10Internal Revenue Service. Taxpayer Bill of Rights
Professional Representation
You can be represented at every stage by a Certified Public Accountant, Enrolled Agent, or attorney. Your representative can handle all communication with the TCO, respond to IDRs, and attend office meetings in your place. To authorize them, you file Form 2848, Power of Attorney and Declaration of Representative.11Internal Revenue Service. About Form 2848 – Power of Attorney and Declaration of Representative The form can be submitted electronically through the IRS online portal.12Internal Revenue Service. Submit Forms 2848 and 8821 Online
If you can’t afford representation, Low Income Taxpayer Clinics provide free or low-cost help. You generally qualify if your income is below a set threshold and the amount in dispute is under $50,000.13Internal Revenue Service. Low Income Taxpayer Clinics The clinics also help taxpayers who speak English as a second language.
Recording Your Meeting
If your case involves an in-person meeting, you have the right to record it. Under Internal Revenue Code Section 7521, the IRS must let you make an audio recording as long as you request it in advance and use your own equipment at your own expense.14Office of the Law Revision Counsel. 26 U.S. Code 7521 – Procedures Involving Taxpayer Interviews The statute doesn’t require the request to be in writing or set a specific number of days’ notice, only that it be made ahead of the meeting.
How the Examination Ends
Once the TCO finishes reviewing your documents, the case closes one of three ways.
A no-change result means the TCO accepted your return as filed. A letter confirms it and the case ends.
If the TCO proposes adjustments and you agree, you sign Form 870, Waiver of Restrictions on Assessment and Collection of Deficiency. Signing consents to immediate assessment of the additional tax, penalties, and interest, and you give up the right to challenge those specific adjustments in Tax Court.15Internal Revenue Service. Form 870 – Waiver of Restrictions on Assessment and Collection of Deficiency It also stops additional interest from piling on as quickly, so when the adjustments are legitimate, signing promptly is usually the cheaper outcome.
If you disagree, the appeals process starts.
Appealing a TCO Decision
Reject the proposed adjustments and the TCO issues a 30-day letter, a preliminary notice summarizing the changes and giving you 30 days to respond.16Internal Revenue Service. Letters and Notices Offering an Appeal Opportunity It arrives with Form 4549 setting out the specific line-item adjustments.17Taxpayer Advocate Service. Letter 525 – Audit Report Giving Taxpayer 30 Days to Respond
Within those 30 days you can request a conference with the IRS Independent Office of Appeals. The format depends on the dollar amount: if the total proposed additional tax and penalties for the tax period is $25,000 or less, you can file a brief small case request; above $25,000 you need a formal written protest.18Internal Revenue Service. Preparing a Request for Appeals
The Appeals Office
Filing a protest moves the case out of the Examination Division and into the Independent Office of Appeals. An Appeals Officer looks at it fresh and tries to settle based on the likelihood each side would prevail in court. Appeals Officers have settlement authority a TCO doesn’t, including the ability to split issues and make concessions based on litigation risk. That’s why many disputes resolve at this stage.
Fast Track Settlement
Before the 30-day letter is issued, you may have another route. Fast Track Settlement brings an Appeals Officer into the examination while it’s still open, with a target of resolving the disagreement within 60 days. You and the examiner both have to agree to participate, and the issues must be fully developed, meaning the documentation is in and positions are stated.19Internal Revenue Service. Fast Track Settlement – Publication 5022 Fast Track isn’t available for correspondence-only cases handled at an IRS campus or where the taxpayer didn’t cooperate during the audit.
Tax Court
If you and the Appeals Officer can’t agree, the IRS issues a Statutory Notice of Deficiency, often called the 90-day letter, sent by certified or registered mail.20Office of the Law Revision Counsel. 26 U.S. Code 6212 – Notice of Deficiency You then have 90 days from the mailing date (150 days if the notice is addressed outside the United States) to file a petition with the United States Tax Court.21Legal Information Institute. 90-Day Letter Filing in Tax Court lets you contest the determination without paying first. Miss the 90 days and the IRS can assess the tax immediately; your only remaining option is to pay in full and sue for a refund in federal district court or the Court of Federal Claims.
Penalties and Interest
An examination that produces additional tax almost always carries penalties and interest on top.
The most common penalty in TCO cases is the accuracy-related penalty under Internal Revenue Code Section 6662: a flat 20% of the underpayment caused by negligence, disregard of rules, or a substantial understatement of income.22Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments23Internal Revenue Service. Accuracy-Related Penalty You can avoid it by showing reasonable cause for the error and that you acted in good faith, but the burden is on you.
Interest starts running on the original due date of the return, not the day the audit closes, and continues until the balance is paid.24Office of the Law Revision Counsel. 26 U.S. Code 6601 – Interest on Underpayment, Nonpayment, or Extensions of Time for Payment of Tax The rate is the federal short-term rate plus three percentage points, compounded daily.25Internal Revenue Service. Quarterly Interest Rates For the first quarter of 2026, the underpayment rate for individuals is 7%. The IRS generally cannot waive interest; it accrues by statute regardless of circumstances.
That’s why delay is costly. An examination that stretches on while you gather records or work through Appeals means interest keeps compounding. If you agree the adjustment is right, signing Form 870 promptly stops the fastest-moving part of the bill.
How Far Back the IRS Can Go
The IRS has three years from the date you filed to assess additional tax.26Internal Revenue Service. Time IRS Can Assess Tax If you filed before the due date, the clock starts on the due date. Three exceptions change that:
- If you left out more than 25% of the gross income shown on your return, the assessment period extends to six years.27Office of the Law Revision Counsel. 26 U.S. Code 6501 – Limitations on Assessment and Collection
- If the return was fraudulent or never filed, there is no time limit.26Internal Revenue Service. Time IRS Can Assess Tax
- The IRS may ask you to sign Form 872 to extend the assessment period. Taxpayers sometimes agree when an examination is near the deadline and documentation is still in progress; refusing can push the IRS to issue a deficiency notice based on incomplete information.
Once a Statutory Notice of Deficiency is issued, the clock pauses. The suspension starts the day after mailing and doesn’t resume until 60 days after a final Tax Court decision.26Internal Revenue Service. Time IRS Can Assess Tax
Paying What You Owe
If the examination leaves you with a balance, the IRS expects payment but offers several ways to get there.
- A short-term payment plan lets you pay within 180 days with no setup fee. Interest and penalties keep accruing until the balance hits zero.
- A long-term installment agreement spreads monthly payments over a longer period. Setup fees range from $22 for automatic bank withdrawals to $69 for non-direct-debit plans. Low-income taxpayers may qualify for a waived or reduced fee.28Internal Revenue Service. Online Payment Agreement Application
- An Offer in Compromise asks the IRS to accept less than the full amount owed, based on genuine financial hardship or a legitimate dispute about the debt. You must be current on all required filings and estimated payments before applying, and low-income individuals may qualify for a fee waiver.29Internal Revenue Service. Tax Topic 204 – Offers in Compromise
The IRS generally won’t accept an Offer in Compromise if you can pay in full through an installment agreement or through equity in your assets.30Internal Revenue Service. Form 656 Booklet – Offer in Compromise Most taxpayers who owe after a TCO examination either pay outright or enter an installment agreement. The Offer in Compromise route has a high rejection rate and only makes sense when the numbers genuinely support it.