Common tax audit red flags include underreporting income, taking disproportionately high deductions, and errors like rounding numbers. The IRS uses algorithms to spot anomalies such as mismatched 1099/W-2 forms, large cash business transactions, 100% business-use vehicle claims, or failing to report cryptocurrency transactions.
The IRS uses a combination of automated and human processes to select which tax returns to audit. Not reporting all of your income is an easy-to-avoid red flag that can lead to an audit. Taking excessive business tax deductions and mixing business and personal expenses can lead to an audit.
The 5 Cs of audit (Criteria, Condition, Cause, Consequence, Corrective Action) are a framework for structuring clear, actionable audit findings, explaining what should be (Criteria), what is found (Condition), why it happened (Cause), what the impact is (Consequence/Effect), and how to fix it (Corrective Action/Recommendation) to drive organizational improvement and compliance.
Audit evidence is critical for verifying the accuracy of financial statements and supporting auditors' opinions. Different types of audit evidence include physical examination, documentation, observations, inquiries, confirmations, analytical procedures, and reperformance.
There are three main types of audit risk—inherent risk, control risk, and detection risk—along with a fourth related concept, sampling risk, which can affect the reliability of audit evidence.
The IRS usually reviews receipts during an audit — if you don't have the receipts, you can sometimes use bank statements or credit card statements to prove your claims instead. Consequences of being audited without receipts can include additional taxes, interest, and financial penalties.
Common red flags include unreported income and excessive deductions. High earners and digital currency users may face extra scrutiny. Maintaining strong records and specifical documentation can help prevent issues.
Here's a list of seven symptoms that call for attention.
If the deductions, losses, or credits on your return are disproportionately large compared with your income, the IRS may want to take a second look at your return. Taking a big loss from the sale of rental property or other investments can also spike the IRS's curiosity.
What Not to Say During an Audit?
Correspondence audits are the most common IRS audit types. The Internal Revenue Service conducts this audit to request additional documentation from taxpayers.
There are five potential threats to auditor independence: self-interest, self-review, advocacy, familiarity, and intimidation. Any lack of independence compromises the integrity of financial markets.
One-time forgiveness, officially known as First-Time Penalty Abatement (FTA), is an IRS program that allows qualified taxpayers to have certain penalties removed from their tax accounts.
Ten Red Flags that Could Trigger an IRS Audit
Seven Risk Categories in Cyber Risk Management:
According to a 2021 article in the Wall Street Journal, “Fewer than one million Americans get audited each year. But individuals who don't file their taxes, or underreport their income, are top of the list.” Taxpayers who have recently made cryptocurrency or NFT transactions are also frequently audited.