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An IRS tax audit is a formal examination of an individual or organization’s accounts and financial records to ensure that they are properly reported under the tax laws. Understanding the reason for your return being audited, what information the examiners can ask for, and how to defend yourself during an audit.

The IRS has multiple automated and systematic selection mechanisms. The selection does not necessarily mean that something is wrong or that the selection was done badly.

• Discriminant Function (DIF) System: Computer-based scoring system based on norms from the past. High scores mean there is potential for tax adjustment.
• Information Matching (CP2000): Automatic matching of reported income with third-party forms, such as the Forms W-2, 1099, and 1095.
• Other audit returns from related parties (such as business partners, investors) may be automatically included.

Audit Trigger	Flag Reason	Mitigation / Preventive Step
Unreported Income	Discrepancies between 1099/W-2 forms and reported gross income.	Reconcile all 1099-K, 1099-NEC, and bank deposits prior to filing.
Disproportionate Deductions	Itemized deductions or Schedule C expenses far above industry averages.	Maintain contemporaneous records, receipts, and logbooks.
Consecutive Business Losses	Reporting losses on Schedule C for 3 out of 5 years (Hobby Loss Rule).	Document a clear profit motive, separate accounts, and business activities.
Offshore Assets	Unreported foreign bank accounts or missing FBAR/Form 8938 filings.	Timely file FinCEN Form 114 and disclose foreign assets accurately.

Table 1.1 Types of Audit Triggers

Examinations are conducted in three main forms by the IRS:

Correspondence Audit: All done through the mail. Usually deals with easy problems such as confirming charitable contributions or easy deductions.

Office Audit: An IRS audit that is held at their office. Specifically targets moderate-level difficulty in which small business and/or itemized deductions are involved.

Field Audit: This is when an audit takes place at the taxpayer’s residence, place of business, or representative’s office. The widest of interests, frequently involving complicated corporate or high-net-worth returns.

The IRS has wide powers under Internal Revenue Code Section 7602 to examine books, records, and papers.

An IRS Information Document Request (IDR) is issued that provides a list of files to be submitted.

Income Records: Bank statements, 1099 forms, deposit slips, and sales logs.

Expense Proof: Cancelled checks, receipts, invoices, and credit card statements.

Operational Logs: Vehicle mileage logs, calendar entries for business travel/meals, and contracts.

Note: Under the Taxpayer Bill of Rights, taxpayers may have the right to professional representation (Form 2848), confidentiality, and protection from unnecessary and burdensome examinations.

An examination report is issued by the IRS at the end of an examination that summarizes its findings.

Outcome Stage	Applicable Form / Notice	Taxpayer Action / Rights
Agreement	Form 4549 (Income Tax Examination Changes)	Sign the form and pay additional tax, penalties, and interest, or set up a payment agreement.
Administrative Appeal	30-Day Letter	Submit a formal written protest within 30 days to request an Independent Office of Appeals review.
Litigation Notice	90-Day Letter (Notice of Deficiency)	File a petition with the U.S. Tax Court within 90 days before paying disputed taxes.
Audit Reconsideration	Form 12661 / Written Letter	Request reopening of a closed audit if new documentation is available and tax remains unpaid.

Table 1.2 How Audit Reconsideration Works

An IRS audit determination is a determination that the IRS issues to determine additional underlying tax, but almost always, it will result in mandatory interest due on the underlying tax under IRC § 6601 and various civil penalties under IRC § 6662 and § 6651. It’s a major part of the audit resolution phase to be aware of how these fines are calculated and how to contest them legally.

• Accuracy-Related Penalty (IRC § 6662): A 20% penalty for underpayment due to negligence, failure to comply with rules, or a substantial understatement of income tax (defined as more than the larger of 10% of the tax required to be shown or $5,000).
• Civil Fraud Penalty (IRC § 6663): A harsh, 75% penalty is imposed when the IRS is able to establish clear and convincing evidence that the underpayment was done on intentional grounds or through deceptive methods.

A taxpayer or their representative may file a formal Penalty Abatement Request to eliminate or reduce these extra assessments. Two legal frameworks are mainly responsible for the provision of abatement:

• Reasonable Cause (IRC § 6664(c)): When the tax error was made despite the exercise of ordinary business care and prudence (e.g., reliance on incorrect advice of a qualified tax professional, extreme illness, or destruction of records as a result of a natural disaster).
• First-Time Penalty Abatement (FTA): Administrative relief for taxpayers who have had a clean compliance and filing record for the last 3 tax years.

Conclusion

Taxpayers can maintain all their legal rights if they know the auditing process from computer screening through to the last administrative step. Keeping detailed records and having proper tax advisers involved in the audit process is essential to resolving an audit optimally.

 

SMO:

Is an IRS audit your concern? Understand the important selection triggers, limits on documents requested, and formal appeals to safeguard your rights. Get the complete tax defence guide today!

What are the most common triggers for an IRS tax audit?

Often, IRS tax audits are the result of automated cross-referencing systems, not manual selection. Income mismatching is the most common. When the amounts reported on your Form 1040 don’t match those reported to the IRS by a third party on Form W-2, Form 1099, or Form 1095.

How far back can the IRS go when conducting an audit?

In general, the IRS three-year statute of limitations applies to tax returns. If the IRS determines a significant underreporting (more than 25% of gross income), however, the audit time period will automatically be extended to 6 years.

What should I do if I disagree with the proposed changes in an audit?

Do not sign the audit agreement if you do not agree with the results of the audit which appear on Form 4549. The IRS will send a Letter of Proposed Adjustments (30-Day Letter) listing the adjustments. A formal written protest is sent within 30 days to appeal to the IRS Independent Office of Appeals.

What is IRS Audit Reconsideration, and who qualifies for it?

A process in which the IRS reviews the findings of a previously conducted audit is called Audit Reconsideration. This applies when the taxpayer was not involved in the initial audit, has moved and did not receive a letter from the auditor, or the taxpayer now has additional supporting documentation.