Schedule C Audits: What the IRS Actually Examines When It Audits a Self-Employed Return

When the IRS audits a W-2 employee, the income side is usually settled before anyone opens the file. The employer reported it. When the IRS audits a Schedule C, nothing is settled. The examiner wants to know two things: did you report all of your income, and can you prove your deductions?

Most self-employed people prepare only for the second question. The Internal Revenue Manual makes clear that examiners start with the first.

The minimum income probes

IRM 4.10.4 governs the examination of income. For individual business returns, IRM 4.10.4.2.3 lists minimum income probes that examiners are directed to perform, including:

• A financial status analysis.
• An initial interview.
• A tour of business sites.
• An evaluation of internal controls.
• A reconciliation of income per books and records to the income on the return.
• Testing gross receipts.
• A bank account analysis.
• Business ratio analyses.

There is a separate item for e-commerce, which matters if you sell through online platforms. Here is what the important ones look like from your side of the table.

The financial status analysis

The examiner builds a picture of your cash flow, business and personal, to estimate whether you had enough reported income to cover what you spent. According to IRM 4.10.4.2.3.1, personal living expenses are estimated using Bureau of Labor Statistics information or comparable statistics unless the actual amount is on the return. If you reported $28,000 of profit and live a $70,000 life with no loans or savings to explain the gap, that imbalance is a problem before the examiner reads a single receipt.

The initial interview

IRM 4.10.4.2.3.2 directs examiners to use the initial interview to understand your financial picture, your business history and operations, and your recordkeeping. It specifically says to ask about nontaxable sources of funds, gifts, loans, known errors or omissions, and unreported sources of income, early in the examination.

Those questions matter because your answers become the baseline for everything that follows, including any indirect method of reconstructing income. Answer accurately. If you do not know, say so and follow up.

Testing gross receipts

IRM 4.10.4.2.3.6 tells the examiner to trace entries in your books back to original sales documents, such as receipts, invoices, or job contracts, and to trace original documents forward into the books. If your invoices are numbered, the examiner looks for missing numbers. Gig workers should expect platform reports and 1099s to be compared to Schedule C line 1. See reconciling a 1099-K on Schedule C.

The bank account analysis

Under IRM 4.10.4.2.3.7, the examiner analyzes your business and personal accounts, including investment accounts. The manual says the IRS is not prohibited from asking for those records on the first information document request. The analysis looks for deposits that may be income, expenses paid from other sources, commingling of business and personal money, and cash deposits. Nontaxable items such as loans, transfers between accounts, and returned checks are backed out to arrive at taxable deposits. The full method, and how to defend it, is in the bank deposits analysis.

Ratio analysis

IRM 4.10.4.2.3.8 directs a horizontal analysis for business returns, comparing the year under audit to the prior and subsequent years. It says significant variations of 5 percent or more suggest changes in business or reporting practices that need to be discussed with you. A sudden drop in gross margin, or expenses that jump while income stays flat, will get questions.

If those probes come back clean, meaning income reconciles and there are no unexplained deposits or imbalances, the examination of income can be limited. If they do not, IRM 4.10.4 calls for a more in-depth examination of income, which can include formal indirect methods.

Most people walk into a Schedule C audit ready to defend their expenses. The examiner walks in ready to test their income. Prepare for both.

The expense side

Expenses are your burden to prove. IRC Section 6001 and Treas. Reg. 1.6001-1(a) require records sufficient to establish your deductions. For certain categories, the bar is higher. Vehicles are listed property, and IRC 274(d) requires adequate records or sufficient corroborating evidence, with no estimates. See the mileage log requirements.

The items that most often get attention on a gig or freelance Schedule C:

• Car and truck expenses without a log, or with standard mileage and actual costs both claimed.
• Home office deductions that do not meet the regular and exclusive use test. See home office deduction risks.
• Phone, internet, and equipment claimed at 100% business use.
• Meals, travel, and "other expenses" with vague descriptions.
• Repeated losses that raise the hobby question. See hobby or business under Section 183.

Your rights during the audit

Federal law puts some guardrails on the process:

• Explanation of the process. Under IRC 7521(b)(1), before or at an initial in-person interview about determining tax, the IRS must explain the audit process and your rights under it.
• Right to stop and consult. Under IRC 7521(b)(2), if you clearly state during an interview that you want to consult an attorney, CPA, enrolled agent, or other person permitted to represent you, the interview must be suspended, except for an interview initiated by an administrative summons.
• Representation. Under IRC 7521(c), a qualified representative with a written power of attorney can represent you in the interview, and the IRS cannot require you to attend with the representative absent an administrative summons. IRM 4.10.4.2.3.2 notes the examiner may ask for your voluntary presence through the representative.
• Recording. Under IRC 7521(a)(1), with advance request, you may make an audio recording of an in-person interview at your own expense.

Burden of proof if it goes further

IRC 7491(a) can shift the burden of proof on a factual issue to the IRS in a court proceeding if you introduce credible evidence, but only if you have complied with the substantiation requirements, maintained all required records, and cooperated with reasonable IRS requests. In other words, the burden shift rewards the taxpayer who kept records and cooperated. It does not rescue the one who did not.

And under IRC 7491(b), if the IRS reconstructs an individual's income solely through statistical information on unrelated taxpayers, the IRS bears the burden of proof on that item.

How to prepare

1. Read the audit letter and the information document request line by line. Provide what is asked for, organized, and nothing that was not asked for.
2. Reconcile your bank deposits to Schedule C gross receipts before the examiner does. Document every nontaxable deposit.
3. Pull together 1099s, platform annual summaries, invoices, and receipts.
4. Assemble the mileage log and vehicle records.
5. Think carefully before sitting for an interview without representation, especially if income is the issue.

For more on the audit process from a different angle, our firm's overview of audit triggers for Schedule C filers is worth reading.