The IRS reviews millions of tax returns each year but audits only a small percentage of them. The Discriminant Index Function (DIF) score helps determine which returns require closer examination. Understanding how the IRS uses this system can help taxpayers file accurately and avoid unnecessary scrutiny.
What is the DIF score?
The DIF score is a numerical rating that the IRS assigns to tax returns based on the likelihood of errors or discrepancies. The IRS does not publicly disclose the exact formula, but the score is calculated using historical data and patterns found in previously audited returns. A higher DIF score suggests that a return has unusual or inconsistent information that may indicate a mistake or possible underreporting of income.
How does the IRS select returns for audit?
The IRS uses the DIF score as part of an automated system to flag returns for further review. However, receiving a high DIF score does not automatically trigger an audit. Instead, tax returns with elevated scores undergo additional screening by IRS agents. If an agent determines that a return warrants further investigation, the IRS may initiate an audit.
Factors that influence the DIF score
Several factors can contribute to a higher DIF score, such as large discrepancies between reported income and deductions, unusually high or low income compared to similar taxpayers, excessive business expenses or charitable contributions, and frequent changes in filing status or dependent claims. Taxpayers whose deductions or credits significantly differ from industry norms may attract further scrutiny.
Filing an accurate and complete tax return is a reliable way to avoid IRS scrutiny. Keeping thorough records, reporting all sources of income, and ensuring deductions are legitimate can help lower the chance of an audit. While the DIF score plays a crucial role in IRS audits, careful tax preparation can prevent unnecessary issues.