How to Handle an IRS Audit Client — Complete Practitioner Guide
Types of IRS Audits and How to Handle Each
| Audit Type | How It Works | Typical Issues | Response Strategy | Average Duration |
|---|---|---|---|---|
| Correspondence audit (CP2000, Letter 566) | IRS sends a letter requesting documentation for specific items | Unreported income; unsupported deductions; math errors | Respond in writing with documentation; do not call | 2–6 months |
| Office audit (field office) | Taxpayer (and representative) meets with IRS agent at IRS office | Schedule C deductions; rental income; charitable contributions | Prepare documentation; represent client at meeting; limit scope | 3–9 months |
| Field audit (at taxpayer's location) | IRS agent visits taxpayer's home or business | Complex business returns; large deductions; high-income returns | Prepare documentation; control the scope; limit access to records | 6–18 months |
| TCMP (Taxpayer Compliance Measurement Program) | Comprehensive audit of every line of the return | Random selection; all items examined | Prepare documentation for every item; be thorough | 12–24 months |
Source: IRS Publication 556; IRS.gov/audits
Taxpayers who are represented by an EA, CPA, or attorney in an IRS audit consistently achieve better outcomes than unrepresented taxpayers. A study by the Taxpayer Advocate Service found that represented taxpayers were 3x more likely to have audit adjustments reduced or eliminated compared to unrepresented taxpayers. The key reasons: (1) representatives know what documentation is required; (2) representatives know what the IRS can and cannot ask for; (3) representatives can negotiate with the IRS agent; and (4) representatives prevent clients from making damaging statements.
The Audit Representation Workflow
| Step | Action | Timeline | Notes |
|---|---|---|---|
| 1. Obtain power of attorney | File Form 2848 (Power of Attorney) with the IRS | Day 1 | This allows you to communicate with the IRS on behalf of the client |
| 2. Review the audit notice | Identify the audit type; the issues being examined; and the documentation requested | Day 1–2 | Correspondence audits: respond by mail; office/field audits: schedule a meeting |
| 3. Review the return | Review the original return; identify potential vulnerabilities; assess the risk | Day 2–5 | Identify issues beyond those raised by the IRS |
| 4. Gather documentation | Collect all documentation supporting the items under examination | Day 5–14 | Organize documentation by issue; create a documentation index |
| 5. Prepare the response | Draft the response letter (correspondence audit) or prepare for the meeting (office/field audit) | Day 14–21 | Be thorough; anticipate IRS questions; prepare concise explanations |
| 6. Represent the client | Respond to the IRS or attend the meeting; present documentation; negotiate | Per IRS schedule | Control the scope; do not volunteer information beyond what is requested |
| 7. Review the audit report | Review the Revenue Agent's Report (RAR); identify errors; decide whether to agree or appeal | Upon receipt | You have 30 days to appeal to the IRS Office of Appeals |
| 8. Appeal if necessary | File a protest letter with the IRS Office of Appeals | Within 30 days of RAR | Appeals resolves 80%+ of cases without going to Tax Court |
Source: IRS Publication 556; IRS.gov/appeals
Step 1 — Assess the risk: 'Let me review the audit notice and your return. The IRS is examining [specific items]. Based on my review, I believe the risk is [low/medium/high] because [reason].'
Step 2 — Explain the process: 'Here is how the audit process works: [explain the type of audit and what to expect]. I will represent you throughout the process — you will not need to speak with the IRS directly.'
Step 3 — Quote the fee: 'My fee for audit representation is $[X] for the initial response/meeting. If the audit expands or goes to Appeals, I will quote additional fees at that time. I require a retainer of $[X] to begin.'
Step 4 — Set expectations: 'I cannot guarantee a specific outcome — but I can tell you that represented taxpayers consistently achieve better results than unrepresented taxpayers. My goal is to minimize the adjustment and protect your rights throughout the process.'
IRS Audit Red Flags by Return Type
| Return Type | Common Audit Triggers | Documentation Required | Risk Level |
|---|---|---|---|
| Schedule C (self-employment) | High deductions relative to income; home office; vehicle; meals | Receipts; mileage log; business purpose documentation | High |
| Schedule E (rental property) | Passive loss deductions; depreciation; repairs vs. improvements | Receipts; depreciation schedules; rental agreements | Medium |
| Schedule A (itemized deductions) | Large charitable contributions; unreimbursed employee expenses; casualty losses | Receipts; appraisals; employer documentation | Medium |
| High income returns (>$500K) | All items; foreign accounts; large deductions | All supporting documentation; FBAR; Form 8938 | High |
| Cash-intensive businesses | Unreported income; large cash deductions | Bank statements; cash receipts; Z-tapes | Very High |
| Cryptocurrency | Unreported gains; basis calculations | Exchange records; wallet records; crypto tax software reports | High |
Source: IRS Data Book 2024; Taxpayer Advocate Service Annual Report 2024
Background: Client received an office audit notice for their 2023 Schedule C. The IRS proposed $95,000 in additional income based on bank deposits that exceeded reported income. Analysis: the $95,000 discrepancy was due to: (1) $40,000 in loan proceeds deposited to the business account; (2) $25,000 in transfers from personal to business account; and (3) $30,000 in legitimate income that was reported. Action: prepared a bank deposit analysis showing the source of all deposits; documented the loan with a promissory note; documented the transfers with bank statements. Result: IRS accepted the documentation; audit adjustment reduced from $95,000 to $8,000 (a legitimate unreported income item). Tax impact reduced from $26,600 to $2,240. Practitioner fee: $3,500. Client savings: $24,360.
Frequently Asked Questions
First, read the notice carefully to determine the type of audit and what is being examined. File Form 2848 (Power of Attorney) to represent the client. Review the client's return and gather all documentation supporting the items under examination. Respond by the deadline — do not ignore an audit notice. Contact the IRS to request additional time if needed.
Yes — if you are an EA, CPA, or attorney, you can represent a client in an IRS audit regardless of whether you prepared the return. However, if your preparation of the return is at issue (e.g., the IRS is questioning your advice), you may have a conflict of interest and should consider referring the client to another representative.
The IRS Office of Appeals is an independent organization within the IRS that resolves tax disputes without litigation. If you disagree with the results of an IRS audit, you can appeal to the Office of Appeals within 30 days of receiving the Revenue Agent's Report. Appeals resolves approximately 80% of cases without going to Tax Court. The Appeals process is free and does not require an attorney.
Correspondence audits typically take 2–6 months. Office audits take 3–9 months. Field audits take 6–18 months. Complex audits (large businesses, tax shelters) can take 2–5 years. The IRS has 3 years from the return due date to assess additional tax (6 years if income is understated by more than 25%; no limit for fraud).
The IRS generally has 3 years from the return due date (or filing date, whichever is later) to assess additional tax. The statute is extended to 6 years if income is understated by more than 25%. There is no statute of limitations for fraudulent returns or returns that were never filed. The statute can also be extended by agreement (Form 872).
The information on this page is intended for licensed tax professionals (CPAs, EAs, and tax attorneys) and is provided for educational and research purposes only. Tax law is complex and fact-specific — all strategies discussed are subject to limitations, phase-outs, and conditions that may not apply to every client situation. Practitioners should independently verify all information against current IRS guidance, Treasury Regulations, and applicable state law before advising clients. This content does not constitute legal or tax advice.
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