What triggers a red flag in an audit?

I’ve been reading about audits and came across the term “red flags.” I’m curious—what exactly triggers a red flag during an audit? Are there specific mistakes, inconsistencies, or financial patterns that make auditors take a closer look? Would love to hear from professionals or anyone who’s experienced this firsthand.
 
As far as I can tell, audits are typically initiated by things that appear odd or inconsistent, such as:
  • Reporting income that is significantly higher or lower than that of others in your field
  • Large deductions (particularly for home office, meals, or travel)
  • Regular losses from side ventures
  • Forms that are missing or inconsistent (such as W-2s or 1099s)
  • Large-scale financial transactions
  • Round figures that appear to be estimates
  • Third-party data reveals unreported income.
In general, anything that appears out of the ordinary or doesn't add up can be cause for concern.
 
A discrepancy between tax returns and third-party reports, high deductions compared to income, and non-compliance items with high rates like some business losses and tax credits may trigger an audit.
 
Red flags in an audit usually show up when there are unusual patterns, inconsistencies, or errors in financial records. Common triggers include missing documentation, large or unexplained transactions, discrepancies between accounts, unusual revenue spikes, or frequent adjustments to financial statements. Auditors also pay attention to signs of fraud, such as related-party transactions or off-book activities. Essentially, anything that deviates from normal business operations can prompt a closer look.
 
Such common audit triggers as failing to report all of your income, claiming unusually large business deductions, or taking excessive credit limits than you report can be a trigger.Red flags on the accounting front are also, lack of or poor documentation, numerous manual journal entries, and transactions made in cash without adequate trails.
 
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