And How to Avoid Triggering IRS Review

Nobody wants an IRS audit. It’s stressful, time-consuming, and potentially expensive if your taxes weren’t prepared correctly. Most audits are avoided simply by knowing what triggers IRS attention and preparing your return carefully.

Here are the top 15 audit red flags the IRS watches closely every tax season — including the common mistakes taxpayers don’t realize could get them flagged.

1. Extreme Changes in Income Year-to-Year

Big spikes or drops in income may trigger IRS review because they don’t match normal earning patterns.
Examples:

• sudden unemployment income
• major increases with no explanation
• self-employment fluctuation

2. Not Reporting ALL Income

IRS receives copies of:

• W-2s
• 1099s
• Earnings statements
• Unemployment income

If your return doesn’t include income IRS already has, that’s automatic audit territory.

3. Making Up Numbers Instead of Using Actual Amounts

Rounded numbers (like $500, $2,000, or $7,500) look suspicious.
Real expenses rarely land perfectly on even-dollar amounts.

4. Claiming Dependents You Can’t Legally Claim

IRS checks:

• SSNs
• birthdates
• claiming history
• custody rules

If another taxpayer already claimed the same dependent — expect issues.

5. Self-Employment With High Expenses

Small business returns get audited more than wage earners because expenses are easier to exaggerate.
Watch out for:

• high deductions
• big losses
• lifestyle expenses claimed as business

6. Excessive Charitable Donations

IRS compares your donation amounts to your income level.
If donations look unusually high, you may need documentation.

7. Rental Property Losses Every Year

Real estate deductions are legitimate — but repeated losses year after year look like tax shelters.

8. Filing Schedule C With Minimal Income

IRS flags situations where someone claims business expenses without legitimate business earnings.

9. Earned Income Credit Filing with Inconsistent Income

EITC is a major IRS fraud target. Lots of identity theft and dependent fraud is committed using this credit. Expect more scrutiny when claiming it.

10. Claiming the Child Tax Credit Without Correct Support

Dependent rules are strict under IRS law. If you don’t prove residency and support, the credit can be denied — and the IRS may audit multiple years.

11. Home Office Deductions

This deduction is legal — but frequently abused. IRS reviews:

• square footage
• exclusive use
• business necessity
• legitimate expenses

12. Large Cash Deposits

Cash businesses trigger audit risk because IRS assumes possible unreported income.

13. Cryptocurrency Trading Without Reporting

IRS now tracks digital currency transactions through exchanges. If you sell, swap, or convert crypto without reporting — expect a letter.

14. Employer Misclassification

Confusion between W-2 employees and 1099 contractors often leads to IRS review and reclassification.

15. Not Filing When You Should

Failure to file is one of the fastest paths to IRS investigation, especially if income is reported under your Social Security Number.

Important: IRS Audits Aren’t Random

Although the IRS does have random selection, most audits are triggered by:

• mismatched information
• unusual numbers
• credits claimed incorrectly
• suspicious patterns
• risk scoring algorithms

The IRS compares millions of returns against expected patterns every year.

How to Avoid an Audit

✔ file on time
✔ report all income
✔ avoid guessing
✔ keep receipts
✔ document dependents
✔ don’t inflate expenses
✔ only take deductions you’re legally allowed

Doing your return correctly is your best audit protection.

When to Call a Professional

Get help if you:

• are self-employed
• claim large deductions
• own a business
• have rental property
• have crypto transactions
• claim complex credits

A licensed tax professional reduces risk dramatically.

A refund doesn’t protect you from an audit — but knowledge does.
If you stay accurate, honest, and documented, most red flags become non-issues.