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Common IRS Audit Issues and How to Address Them: A Comprehensive Guide
Wondering what are common IRS audit issues and how to address them? Explore this detailed guide to gain confidence in navigating the audit process.
Receiving a notice from the Internal Revenue Service (IRS) informing you that you're being audited can be a stressful experience. Audits can happen for various reasons, and it's essential to be prepared. Understanding common IRS audit issues and knowing how to address them can make the process less intimidating and more manageable.
In this comprehensive guide, we'll discuss the most common IRS audit issues, their causes, and provide guidance on how to address them effectively. Remember that while this guide is a valuable resource, it's essential to consult with a tax professional for personalized assistance, especially if you are facing a complex audit situation.
The Issues That Drive Most Audit Adjustments
Across audits of individual and small-business returns, a handful of issues account for the bulk of proposed deficiencies. Knowing which ones an auditor is most likely to probe lets you organize records in advance and respond cleanly when the IDR (Information Document Request) arrives.
Substantiation, Characterization, and Unreported Income
Substantiation issues are the most common. The auditor accepts that a deduction is legal but disputes whether you can prove the amount. Charitable contributions over $250 require a written acknowledgment from the recipient organization with specific language under Treas. Reg. § 1.170A-13. Travel and meal expenses need contemporaneous records showing date, amount, business purpose, and attendees per IRC § 274(d). Vehicle deductions require a mileage log kept at or near the time of use. Missing or recreated documentation reduces or eliminates the deduction.
Characterization disputes are the second category. Was that payment ordinary income or capital gain? Was the worker an employee or an independent contractor under the 20-factor common-law test? Was the activity a trade or business or a hobby under IRC § 183? These turn on facts and case law, not just records. Resolving them requires marshaling the right factual evidence and citing relevant authority — not just producing receipts.
Unreported income is the third. The IRS cross-references your reported income against Information Returns (1099, W-2, K-1, 1098, 5498) and bank deposit analysis on field audits. If your reported gross receipts on Schedule C are materially below total business bank deposits, expect the auditor to assume the difference is unreported income and require you to prove otherwise — nontaxable loans, transfers between accounts, gifts, returns of capital all need documentation.
Each category responds to different evidence. Substantiation issues need records; characterization issues need facts and citations; unreported income issues need a complete accounting of every deposit traced to a non-income source. Producing the wrong type of evidence wastes time without moving the auditor.
Frequently Asked Questions
What should I do if I receive an IRS audit notice?
Read the notice carefully to identify which tax year and which items the IRS is examining, and note any response deadline. Gather the records that support the questioned items, such as receipts, bank statements, and forms, and respond only to what is being asked. Avoid ignoring the notice, since that can lead to additional assessments, and consider consulting a tax professional if the issues are complex or the amounts are significant.
How far back can the IRS audit my tax returns?
The IRS generally has three years from the date you filed a return to audit it. That window extends to six years if you substantially understated your income, typically by more than 25 percent. There is no time limit when a return is fraudulent or when no return was filed, which is part of why keeping accurate records is important.
What if I disagree with the audit findings?
If you disagree with the auditor's conclusions, you can first discuss the issues with the examiner and provide additional documentation. If you still disagree, you generally have the right to request a review by the IRS Office of Appeals, an independent function that reviews disputed cases. Deadlines apply, so review the dates on your audit report and consider getting professional guidance before they expire.
Can I represent myself during an IRS audit, or should I hire a tax professional?
You can represent yourself during an audit, and for a simple correspondence audit that may be reasonable. For more complex audits, those involving large dollar amounts, or situations where penalties may apply, many taxpayers choose to work with an attorney, CPA, or enrolled agent who can communicate with the IRS on their behalf. The right choice depends on the complexity of your case and your comfort level with IRS procedures.
How can I avoid an IRS audit?
There is no way to guarantee you will never be audited, since some returns are selected at random, but accurate and well-documented returns reduce the risk. Report all income shown on your W-2s and 1099s, keep contemporaneous records for deductions and credits, and make sure the figures on your return are consistent and properly substantiated. Filing carefully and on time, and seeking help with complicated items, also helps.
Is the IRS audit process always the same for everyone?
No. The IRS conducts several types of audits, ranging from correspondence audits handled entirely by mail to office audits at an IRS location and field audits conducted in person. The scope and process vary based on the complexity of the return and the issues being examined. A simple documentation question is handled very differently from an examination involving a business or multiple disputed items.
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This content was written and reviewed by the licensed tax attorneys at Victory Tax Lawyers, LLP. Our attorneys specialize in IRS tax relief and are licensed members of the California State Bar with a nationwide practice.
Last Reviewed: 2026 · Meet Our Attorneys →
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