A California sales tax audit can be easier to prepare for when you know which records to collect and what each document explains. The goal is to create a clear connection between the business’s transactions, accounting records, and reported tax figures.
The California Department of Tax and Fee Administration (CDTFA) reviews sales and use tax reporting. Start with the requested periods, preserve the underlying records, and identify questions that need clarification before preparing your response.
Confirm the Audit Period and Initial Requests
Create a folder for the audit notice, appointment letter, document requests, and correspondence. Record the account being examined, the periods involved, and any dates requiring a response.
CDTFA’s audit publication explains that the auditor discusses the audit period, business operations, and records needed during initial contact. Use that information to define what you need to gather.
If a request is unclear, ask for clarification. Explain any difficulty obtaining older files promptly and confirm revised arrangements in writing. A request for additional time should not be treated as an approved extension.
Collect Returns and Supporting Accounting Records
Gather the sales and use tax returns filed for the requested periods, together with amendments, schedules, and preparation worksheets. Include the corresponding general ledger, sales journals, financial statements, and relevant income tax returns.
CDTFA’s record requirements include books of account, original transaction documents, and working papers used to prepare returns. These records should allow reported amounts and claimed deductions to be checked.
Organize the material by reporting period. If an accountant prepared a return, request the supporting calculations as well as the filed copy.
Note changes in accounting methods, software, locations, or ownership that may help explain how records were maintained.
Preserve Detailed Sales and Refund Information
Collect invoices, receipts, point-of-sale data, online order records, and credit memos. Summary reports are useful, but retain the transaction detail supporting them.
Keep refunds, cancellations, discounts, and adjustments identifiable. For a returned item, for example, preserve the original transaction and the related refund record so the adjustment can be followed.
If the business used multiple checkout systems, list the dates each system operated and where its data can be found. Check that exports contain the full requested date range.
Work from copies when adding explanations or organizing transactions. Keep the original records available, including entries that require further review.
Explain Differences Between Sales and Deposits
Bring together business bank statements, deposit records, and payment-processor statements. Compare them with recorded sales and identify why amounts differ.
A processor may deposit a net amount after deducting fees or refunds. A bank account may also receive loan proceeds, owner contributions, or transfers that are not sales. Keep documentation showing what those entries represent.
Prepare a reconciliation that lists each difference, its explanation, and the supporting record. For example, a transfer between business accounts should be traceable through both statements.
Leave unresolved differences clearly marked for investigation. An unexplained adjustment made only to balance the figures can make the records harder to understand.
How Leading Tax Group Can Help With a California Sales Tax Audit
Some preparation questions need more than bookkeeping work. Missing resale documentation, uncertain tax treatment, or discrepancies across reporting periods may require professional review.
Leading Tax Group offers CDTFA audit representation for California businesses. Its tax professionals can guide business owners through the audit process and represent them in dealings with the agency.
When discussing your situation, share the audit notice, requested periods, and a brief explanation of the records available. Point out any missing documents or transactions whose treatment is unclear.
Ask how the proposed engagement would address document preparation, communication with the auditor, and questions about potential adjustments. Confirm the person responsible for your matter, the scope of work, and the fees. This keeps the discussion focused on the assistance your business needs.
Gather Evidence for Resale and Other Deductions
Locate resale certificates for customers whose purchases were treated as sales for resale. Connect the certificates to the relevant invoices and retain associated purchase orders where needed.
CDTFA’s resale documentation guidance explains that timely acceptance matters. A certificate obtained late does not automatically relieve the seller of tax liability; other satisfactory evidence may be required.
Identify gaps without changing document dates or creating unsupported explanations. Ask your tax adviser how to address incomplete records.
For other claimed deductions, gather evidence appropriate to the transaction, such as shipping records, exemption documents, or refund details. The supporting facts should explain why the reported treatment applies.
Include Business Purchases and Equipment
Sales records are only part of the preparation. A sales and use tax audit may also examine equipment and supplies purchased without tax that could be subject to California use tax.
Collect vendor invoices, purchase orders, equipment records, and evidence of tax paid. Flag out-of-state purchases and inventory originally purchased for resale that the business later used itself.
An invoice helps establish what was purchased, its price, and whether tax was charged. A payment confirmation alone may not answer those questions.
Have uncertain purchases reviewed individually. The absence of sales tax on an invoice does not automatically establish the final tax treatment.
Keep Marketplace Transactions Identifiable
If the business sells through online marketplaces, preserve platform sales reports and documentation showing who was responsible for collecting and paying tax.
CDTFA’s marketplace guidance advises sellers to retain evidence of the marketplace facilitator’s responsibility. Relevant records may include an agreement and supporting registration documentation.
Keep marketplace transactions distinguishable from direct website or in-store sales. An arrangement covering one sales channel should not be assumed to cover another.
The records should make it possible to explain each channel’s figures without counting the same transaction twice.
Retain Records and Track Every Submission
CDTFA generally requires relevant business records to be kept for at least four years unless it authorizes earlier destruction in writing. Records covering an ongoing audit must be retained until completion, even beyond four years. Related records should also remain available while a dispute is unresolved.
Protect electronic data from automatic deletion or loss during software changes. If records are missing, discuss reconstruction with your adviser and auditor, and identify reconstructed material clearly.
Maintain a submission log showing each request, the documents provided, the periods covered, and the delivery date. Use the agreed secure transfer method and keep copies of everything submitted.
Note: This article provides general information, not individualized tax or legal advice. Audit requirements and tax treatment depend on the business and its transactions. Confirm current CDTFA guidance and consult a qualified tax professional about your circumstances.