Schedule C audit: supporting your business income and expenses
A Schedule C audit tests the income and expenses of your sole proprietorship. The IRS looks for records that clearly show both: books, receipts, invoices and statements. Organize them by category, match income to your forms and deposits, and respond by the date on your letter.
Where Schedule C exams start
Self-employed people report profit or loss on Schedule C, and an exam letter may ask about income, expenses or both. It may arrive as a mail audit, an office appointment or, for larger operations, a visit. Whatever the format, read which lines the letter names and respond to those.
The records the IRS says to keep
IRS Publication 583 says records help you monitor the business, prepare returns, identify receipts, track deductible expenses and support items on the return. The law generally does not require a particular type of record, and any system that clearly shows income and expenses works. Books summarize your transactions; receipts, invoices, canceled checks and bank statements back up the entries.
One habit the publication highlights is reconciling your business checkbook monthly. If your records are thin, a reconciled set of bank statements can often fill in missing support.
Imagine a freelance photographer
Take a photographer who deducted equipment, travel to shoots and a share of software subscriptions. For each category she can make a short list: what the item was, the date, the business purpose, and where the receipt or statement line is. For a lump of small purchases, a summary tied to the underlying statements is easier to follow than hundreds of loose slips.
Notice what is being built: a link from each deduction on Schedule C to a document. That link is what an examiner is trying to find.
- Group expenses by the categories on Schedule C
- Add a one-line business purpose to each larger item
- Keep personal and business spending visibly separate
- Explain unusual items in a note instead of leaving them to be guessed
Income matters as much as expenses
The IRS gig economy page says income from side or part-time work must be reported even if you did not receive a Form 1099-K or 1099-NEC, and even if you were paid in cash, property, goods or virtual currency. Compare your reported income to your deposits and to any information forms. A mismatch can prompt questions even if the expense side is well documented.
Self-employment tax
If your net earnings are high enough, you owe self-employment tax, which funds Social Security and Medicare and is figured on Schedule SE. The IRS page states the rate and the Social Security wage base, which change from year to year, so check it for the current figures. You can also deduct the employer-equivalent portion of self-employment tax when figuring adjusted gross income. Changes to profit in an exam therefore often change this tax too.
How long to keep records
Publication 583 says to keep records generally until the period of limitations for the return expires. Its table lists 3 years for most cases, 6 years if more than 25% of gross income is omitted, and no limit for fraud or if no return was filed. Only part of the publication was reviewed for this page, so use the current version.
Putting your response together
A good response is organized and plain. IRS Audit Defense Pro is software that helps you organize your facts and draft a response letter you review and send yourself; it is not a law firm, CPA or enrolled agent. For a Schedule C exam, that can mean a cover letter that walks through each category and points to the attached support.
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Upload your IRS notice, answer a few questions, review the analysis and response strategy, fill in your details, and get a response letter you can copy or download as a PDF or DOCX file.
Start your response letterFrequently asked questions
What counts as a good business record?
The IRS says the law generally does not require a specific type of record. Any system that clearly shows income and expenses works, backed by receipts, invoices, canceled checks and bank statements.
What if I lost a receipt?
Say so in your response and offer other evidence, such as a bank or card statement, an invoice, or a written explanation of the purpose. Do not create after-the-fact documents.
Do I owe self-employment tax if I only did side work?
The IRS page sets a minimum level of net earnings above which self-employment tax applies. Check the current IRS page for the figure for your year.
Does unreported 1099 income come up in a Schedule C exam?
It can. Income must be reported whether or not a form arrived, and examiners compare returns to information on file.
Should I keep records after the audit closes?
Publication 583 says to keep records until the period of limitations for the return ends, and the table in it varies by situation.