Understanding the IRS Process for Selecting Tax Returns for Audit

Every year, millions of Americans file their tax returns, but only a small fraction face an IRS audit. The idea of an audit can cause anxiety, yet many taxpayers do not understand how the IRS chooses which returns to examine. Knowing the IRS process for selecting tax returns for audit can help you prepare better and avoid common pitfalls.

How the IRS Identifies Returns for Audit

The IRS uses a combination of automated systems and human review to select tax returns for audit. The process is designed to catch errors, inconsistencies, or suspicious activity while focusing resources on returns with the highest risk of noncompliance.

The Role of the Discriminant Inventory Function System (DIF)

One of the key tools the IRS uses is the Discriminant Inventory Function System, or DIF. This system assigns a score to each tax return based on various factors, including income, deductions, credits, and other reported information. The higher the DIF score, the more likely the return will be audited.

For example, if a taxpayer reports unusually high charitable deductions compared to their income, the DIF system may flag the return for review. The IRS does not disclose the exact formula behind DIF scores to prevent manipulation.

Document Matching and Automated Checks

The IRS cross-checks information reported on tax returns with data from employers, banks, and other third parties. This process, called document matching, helps identify discrepancies such as unreported income or incorrect Social Security numbers.

If the IRS finds mismatches, it may trigger an audit or a request for additional information. For instance, if a taxpayer reports $50,000 in wages but the IRS receives a W-2 form showing $60,000, this discrepancy will likely prompt further scrutiny.

Common Triggers That Increase Audit Risk

Certain factors increase the chance that the IRS will select a tax return for audit. Understanding these can help taxpayers avoid mistakes that raise red flags.

• High Income Levels

Taxpayers with higher incomes face a greater chance of audit. According to IRS data, individuals earning over $1 million have an audit rate of about 2%, compared to less than 0.5% for those earning under $200,000.

• Large or Unusual Deductions

Claiming deductions that are unusually large relative to income, such as excessive business expenses or charitable contributions, can attract attention.

• Self-Employment Income

Self-employed individuals often face more audits due to the complexity of their returns and the potential for underreporting income.

• Home Office Deductions

Incorrect or exaggerated home office deductions are a common audit trigger.

• Claiming the Earned Income Tax Credit (EITC)

The IRS closely monitors returns claiming the EITC because of its history of improper claims.

How the IRS Conducts Audits

Once a return is selected, the IRS may conduct different types of audits depending on the complexity and issues involved.

Correspondence Audits

These audits are the most common and involve the IRS sending a letter requesting additional documentation or clarification. They are usually limited to specific items on the return.

Office Audits

In an office audit, the taxpayer meets with an IRS agent at a local IRS office to discuss the return. This type of audit is more detailed and may cover multiple issues.

Field Audits

Field audits are the most comprehensive and involve an IRS agent visiting the taxpayer’s home, business, or accountant’s office. These audits can last several months and require extensive documentation.

Tips to Reduce Audit Risk

While no taxpayer can guarantee avoiding an audit, following these best practices can lower the chances:

• File Accurate and Complete Returns

Double-check all information, including Social Security numbers, income, and deductions.

• Keep Detailed Records

Maintain receipts, invoices, and other documents to support your claims.

• Avoid Round Numbers

Using exact figures instead of rounded amounts can reduce suspicion.

• Report All Income

Include all sources of income, even small amounts like freelance work or side jobs.

• Be Careful with Deductions

Only claim deductions you are eligible for and keep documentation.

What to Do If You Are Audited

If the IRS selects your return for audit, respond promptly and provide the requested information. Consider consulting a tax professional to help navigate the process. Remember, audits do not always mean wrongdoing; sometimes the IRS just needs clarification.