For an IRS audit focused on Schedule C expenses, the goal is to demonstrate that each expense was ordinary, necessary, and related to the business, while responding to the auditor in an organized and professional manner.
Documentation to prepare
Organize everything by expense category as reported on Schedule C.
| Expense Category | Documentation to Gather |
|---|
| Advertising | Invoices, receipts, contracts, proof of payment |
| Car and truck | Mileage logs, repair receipts, fuel (if actual expense method), lease documents, vehicle purchase records, business-use calculations |
| Insurance | Policy declarations, invoices, canceled checks or bank statements |
| Interest | Loan statements, credit card statements showing business purchases |
| Office expenses | Receipts, invoices, bank or credit card statements |
| Rent/Lease | Lease agreements, canceled checks, bank records |
| Repairs & maintenance | Invoices describing work performed |
| Supplies | Receipts and invoices |
| Travel | Itineraries, receipts, business purpose documentation, conference registrations |
| Meals | Receipts showing amount, attendees (if applicable), business purpose, date and location |
| Utilities | Bills and payment records |
| Contract labor | Forms 1099 (if applicable), contracts, invoices, payment records |
| Wages | Payroll reports, Forms W-2, payroll tax filings |
| Home office | Floor plan, square footage calculations, utility bills, mortgage interest or rent records, depreciation schedules |
Also gather:
- Business bank statements
- Business credit card statements
- General ledger or bookkeeping reports
- Income records (to ensure expenses reconcile with reported income)
- Prior-year depreciation schedules
- Entity formation documents (if relevant)
- Any accounting software reports used to prepare the return
Best practices for organizing records
Create a folder for each expense category containing:
- Schedule showing the total claimed.
- Supporting receipts/invoices.
- Proof of payment.
- Any explanatory notes.
Then prepare a reconciliation showing:
- Amount reported on Schedule C
- Supporting documentation total
- Explanation of any differences
This makes the agent's review much easier.
Handling correspondence with the IRS agent
A good approach is to:
- Respond by the requested deadline.
- Answer only the questions asked.
- Provide copies rather than originals unless specifically requested.
- Organize documents with bookmarks, tabs, or labeled PDFs.
- Include a cover letter identifying each item being provided.
- Keep copies of everything submitted.
- Send documents through the method requested by the examiner (secure upload, fax, or mail).
- Document every phone call, including date, time, and what was discussed.
Avoid volunteering additional information unrelated to the audit scope unless it becomes necessary to clarify an issue.
During conversations with the examiner
- Be courteous and professional.
- Answer questions factually and directly.
- If you don't know an answer, tell the examiner you'll verify and follow up rather than guessing.
- Request clarification if an Information Document Request (IDR) is unclear.
- If additional time is needed, ask for an extension before the due date.
Common Schedule C audit focus areas
The IRS often scrutinizes:
- Vehicle expenses and mileage logs
- Travel and meal expenses
- Home office deductions
- Contract labor
- Cash expenses
- Large "Other Expenses"
- Personal expenses deducted as business expenses
- Expenses that appear disproportionate to reported income
If documentation is incomplete
If receipts are missing, consider gathering:
- Bank statements
- Credit card statements
- Vendor invoices
- Canceled checks
- Appointment books or calendars
- Emails confirming purchases
- Contracts
- Affidavits or explanations where appropriate
While these may not fully replace required records in every situation, they can help substantiate legitimate business expenses depending on the facts.
As the representative
If you're representing the client:
- Review the return before any contact with the examiner.
- Identify weak areas and prepare explanations in advance.
- Ensure the client understands not to communicate directly with the examiner unless necessary.
- Keep responses focused on the requested items.
- Maintain a timeline of all requests and submissions.
A well-organized submission that ties every Schedule C deduction to supporting records and proof of payment often leads to a more efficient audit and reduces follow-up requests.
