When it comes to filing taxes, accuracy matters. A single overlooked figure or missing form can draw the attention of the Internal Revenue Service (IRS).
While an audit may sound intimidating, its purpose is straightforward — to verify that the information on your tax return is accurate. The best way to avoid one is by steering clear of common mistakes.
Why Audits Happen
The IRS conducts audits in two ways: some are random, while others result from discrepancies or unusual patterns detected by the agency’s automated systems.
According to TurboTax, most audits arise when reported income or deductions don’t match what’s on record. Fortunately, understanding what raises red flags can help taxpayers avoid unnecessary scrutiny.
1. Failing to Report All Your Income
One of the most frequent audit triggers is incomplete income reporting. Every employer, client, or financial institution that pays you must report those earnings to the IRS using forms like W-2s or 1099s.
If you forget to include income from freelance work, investments, or side gigs, the IRS’s computer systems will flag the discrepancy immediately.
The IRS’s Matching System Spots Errors
TurboTax explains that the IRS uses advanced software to cross-check income reported by third parties against your return. When a mismatch appears, the agency often issues a letter audit, asking you to explain the missing income.
Keeping organized records of all earnings — especially from gig platforms or digital work — helps ensure your return aligns with IRS data.
2. Mishandling Foreign Bank Accounts
Another common pitfall involves foreign assets. Under the Foreign Account Tax Compliance Act (FATCA), both foreign banks and U.S. taxpayers must disclose certain overseas accounts.
Americans with foreign assets valued at $50,000 or more must file Form 8938, even if the funds aren’t accessed or moved during the year.
Tighter Rules for Transparency
In previous years, taxpayers could simply check a box to acknowledge a foreign account. Today, the requirements are far stricter. The IRS expects detailed reporting, including account numbers, financial institutions, and highest balances.
Failing to provide accurate information — even unintentionally — can lead to steep penalties or an audit. The IRS takes noncompliance with FATCA very seriously.
3. Claiming Questionable Business Deductions
For business owners and self-employed individuals, deductions can be a double-edged sword. While legitimate write-offs lower taxable income, excessive or inconsistent deductions raise suspicion.
The IRS uses occupational codes to compare your reported expenses against industry averages. If your deductions exceed typical levels by 20% or more, your return may be flagged for review.
Keep Detailed Records of Business Expenses
Vehicle use and home office deductions are among the most commonly abused write-offs. The IRS requires proof that these expenses are directly tied to business activity. For example, if you claim a business vehicle, maintain a mileage log detailing every work-related trip.
Incomplete documentation can make valid deductions appear questionable and increase your audit risk.
4. High Incomes Invite Closer Scrutiny
While audit rates have declined in recent years, the odds rise sharply with income. Taxpayers earning more than $200,000 face a higher chance of review.
TurboTax reports that about 1% of taxpayers below this threshold are audited, compared to 4% of high earners. The complexity of wealthier individuals’ returns — with multiple income streams and deductions — often attracts extra attention.
Large Businesses Are Even More Likely to Be Audited
This pattern extends to corporations as well. The IRS audits roughly 1% of small businesses with assets under $10 million, but nearly 18% of larger corporations. The takeaway is clear: the more you earn or own, the more diligent you must be in keeping complete, accurate financial records.
How to Reduce Your Audit Risk
While you can’t eliminate the possibility of an audit, you can minimize the chances. Keep all receipts, tax forms, and supporting documents for at least three years — the typical IRS look-back period.
Use trusted tax software or a certified accountant to double-check your figures and ensure every income source and deduction is properly reported.
Transparency Is Your Best Defense
Most audits stem from simple mistakes, not fraud. The IRS’s goal is fairness, ensuring everyone pays their correct share. Being transparent, consistent, and organized is the easiest way to stay out of trouble. If the IRS contacts you, respond promptly and provide clear documentation to resolve the issue efficiently.
The Bottom Line
Tax season doesn’t have to be stressful. By understanding what triggers audits — and how to avoid them — you can file confidently and accurately.
Report all income, follow foreign account rules, claim only legitimate deductions, and keep meticulous records. A careful approach now can prevent unnecessary IRS attention later and provide lasting peace of mind.
