As a licensed CPA recently shared in a popular thread, certain behaviors and numbers on your return can seriously increase your chances of getting selected. Understanding these red flags can help you file smarter, keep better records, and reduce unnecessary stress.

8 biggest audit triggers to watch out for this tax season

Most taxpayers never have to deal with an audit. But if you're self employed, own rental properties, claim large deductions, or earn outside the typical range, you need to know what catches the IRS's attention. Yet, when you know what they're looking for, you can protect yourself before hitting submit.

1. Being a very low or very high earner

The audit sweet spot? Earning roughly $50,000 to $500,000 per year. This income range has one of the lowest audit rates on average, around 0.1%.

Outside that zone, things get trickier. If you earn under $50k (especially if you're claiming big refunds or credits like the EITC), you'll get more scrutiny. High earners (especially over $500k, and way more so over $1M) face higher odds because the potential tax recovery is larger.

What to do: If you're in the extremes, double check every line and keep really good records.

2. Large deductions relative to your income

This is one of the most common flags, and the one highlighted a lot in the original post.

Claiming huge deductions compared to your gross income raises eyebrows. Example: Reporting $100,000 in gross business income but deducting $65,000 on Schedule C? That's a massive mismatch that almost certainly gets flagged.

The bigger the gap between income and deductions, the higher the risk.

What to do: Deductions must be legitimate and ordinary or necessary for your business. Always keep receipts, mileage logs, invoices, and bank statements organized. Digital storage with timestamps is best.

3. Schedule C filings — especially when income and expenses cancel out

IRS data shows self employed individuals (Schedule C filers) have historically higher rates of underreporting. Returns where business income and expenses nearly or completely offset each other (like $20k income plus $20k expenses equals $0 profit) look suspicious.

Even a Schedule C with $0 net profit year after year can trigger questions.

What to do: Run a real business with real profit intent. Document everything, and consider whether your activity actually qualifies as a hobby versus a business under IRS rules.

4. Oversized charitable donations

Large donations, especially those that significantly reduce your taxable income, get extra attention. Complex strategies like syndicated conservation easements have been under heavy scrutiny in recent years.

What to do: Keep donation receipts, acknowledgment letters from charities, and (for non cash gifts over certain thresholds) qualified appraisals. Stay reasonable relative to your income level.

5. Claiming rental losses (especially with exceptions)

Most rental real estate losses are considered passive and limited. But if you're claiming exceptions, like qualifying as a real estate professional (REPS) or treating short term rentals differently, the IRS wants proof.

They look for detailed time logs showing substantial participation (typically 750 or more hours per year and more than half your working time).

What to do: Maintain a detailed log of hours spent on rental activities (repairs, tenant management, etc.). Apps or simple spreadsheets work great.

6. Incomplete or mismatched filing

The IRS already receives copies of your W-2s, 1099s, and other info forms. If your return doesn't match their records, it gets flagged automatically, often leading to a CP2000 notice or full audit.

What to do: Use tax software that imports third party data, or carefully cross check every document before filing.

7. Huge year-to-year income swings

Dramatic changes in income (especially for business owners) can signal something worth investigating. While legitimate explanations exist (new job, business startup or closure), big swings without clear reason attract attention.

What to do: If your income changes a lot, include a brief explanation or supporting docs if relevant.

8. History of prior audits

Once you're on the IRS radar, you tend to stay there. The DIF system remembers previous flags, so past audits increase future risk.

What to do: Treat any prior audit seriously. Fix issues permanently and keep even better records going forward.

The #1 Way to Protect Yourself

Documentation is everything.

The vast majority of audits resolve with little or no additional tax owed when taxpayers have strong, organized records. Save everything: receipts, logs, bank statements, mileage apps, emails, contracts. Store them securely for at least 7 years.

Most people never get audited, but if you have self employment income, rental properties, large deductions, or high earnings, play defense. File accurately, keep records like your financial future depends on it (because it might), and consider working with a trusted CPA to spot potential issues before the IRS does.

Have questions about your specific situation?
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_{This post is for educational purposes only and is not personalized tax advice. Tax rules change, and your situation may vary. Always consult a qualified tax professional.}

_{(Originally inspired by insights from CPA @money_cruncher on X. Follow for more practical tips!)}

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