Being selected for an IRS audit is not always random. While the IRS does conduct some audits through random selection, a significant portion are triggered by specific patterns on tax returns that the agency's systems flag for review. Knowing what those patterns are — and how to handle your return accordingly — is a practical form of self-protection that every taxpayer should understand.
How the IRS Selects Returns for Audit
The IRS uses a scoring model called the Discriminant Information Function (DIF) to analyze tax returns. Each return receives a score based on how its figures compare to statistical norms for similar filers — people with comparable income levels, filing statuses, and industry classifications. Returns that deviate significantly from those norms are more likely to be pulled for review.
The IRS also receives information from third parties — employers, banks, brokerages, and payment processors — and any discrepancy between what you reported and what was reported on your behalf is a direct audit trigger. Starting in 2024, payment platforms such as Venmo, Cash App, and PayPal are required to issue 1099-Ks for business transactions over $600, which means more self-employed individuals are entering that matching system than ever before.
Common Audit Red Flags
Several patterns consistently draw IRS attention, and understanding them allows you to either correct your approach or ensure your documentation can withstand scrutiny.
High deductions relative to income. If your claimed deductions are disproportionately large compared to your reported income, the IRS will notice. This is particularly true for charitable contributions, business expenses, and home office deductions. When a taxpayer earning $60,000 claims $22,000 in business deductions, that ratio is far outside the statistical norm and scores highly on the DIF model.
Consistent business losses. Reporting a loss from a self-employed activity year after year raises questions about whether the activity qualifies as a business or is being classified as a hobby — a distinction with significant tax implications. Under IRS rules, a business that shows a profit in at least three of five consecutive years is generally presumed not to be a hobby. Activities that consistently produce losses, particularly those that also appear recreational, attract scrutiny.
Unreported income. If a 1099 or W-2 is issued in your name and does not appear on your return, the IRS will likely send a notice or initiate an examination. Their information-matching systems are effective, and the margin for error when income goes unreported — even accidentally — is slim.
Large cash transactions. Certain industries — restaurants, contractors, retailers, personal service providers — are scrutinized more closely because cash income is harder to verify. If your reported income seems low relative to the scale of your operation, that inconsistency can attract attention.
Rounded numbers. Consistent use of round numbers — deductions of exactly $5,000 or $10,000 — can suggest estimation rather than documentation. Real expenses rarely end in even thousands, and specific numbers are more credible to an examiner.
Foreign accounts and assets. Failure to report foreign financial accounts or assets is a serious compliance issue. The IRS has expanded its international enforcement efforts considerably through FATCA and the Bank Secrecy Act's FBAR requirement. Penalties for non-disclosure are severe and can dwarf the underlying tax liability.
New Jersey-Specific Audit Risk Factors
New Jersey taxpayers face a dual audit environment. The state Division of Taxation conducts its own audits independently of the IRS, and the two agencies share information. An IRS audit finding — a determination that you underreported income or overclaimed deductions — can trigger a corresponding NJ state audit. New Jersey is also an aggressive state when it comes to residency audits: if you claim to have moved out of New Jersey, the state may challenge that claim and seek taxes on income earned while they believe you were still a resident. Business owners in South Jersey who work across the Delaware River in Pennsylvania should also be aware of the reciprocal income tax agreement between the two states and how it affects their reporting obligations.
Real-World Scenario
A freelance graphic designer in Marlton claims a home office deduction for her dedicated workspace and deducts vehicle expenses for client visits. Her total deductions represent about 38% of her gross income — high by statistical standards. The IRS sends a correspondence audit notice requesting documentation. Because she maintained a mileage log throughout the year and has photographs and measurements of her dedicated workspace, she provides the requested substantiation and the audit closes with no change. The deductions were legitimate; the documentation made them defensible.
What to Do If You're Audited
An audit notice does not mean you did something wrong. It means the IRS wants to verify information. That said, how you respond matters enormously. Providing more information than was requested, responding without representation, or failing to meet deadlines can all complicate your position.
At HofflerSmith Tax Advisory, IRS audit representation is a core part of what we do. Our Enrolled Agents review the scope of the audit, prepare your documentation, and communicate directly with the IRS on your behalf. You do not have to face that process alone.
If you are concerned about items on a past or upcoming return, or if you have already received an audit notice, reach out to HofflerSmith now. The earlier you engage representation, the more options you have.
Frequently Asked Questions
Q: Does claiming a home office deduction automatically trigger an audit?
A: This is a persistent myth, but it is not accurate. A properly documented home office deduction that is proportionate to your income and business activities does not automatically trigger an audit. What creates risk is claiming the deduction without adequate records, or claiming a disproportionately large amount relative to your income and workspace size.
Q: How far back can the IRS audit my returns?
A: The standard statute of limitations for an IRS audit is three years from the filing date. However, if the IRS determines that you underreported income by more than 25%, that window extends to six years. There is no statute of limitations for fraudulent returns or returns that were never filed.
Q: What happens if an IRS audit finds an error in my favor?
A: It does happen. An audit can result in no change, additional tax owed, or a refund if the examiner identifies deductions or credits you failed to claim. This is one reason having a knowledgeable representative present during an audit is valuable — they can identify opportunities, not just defend positions.
Dealing with an IRS problem? Call HofflerSmith Tax Advisory at (856) 740-4912.
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