How do you respond to a CDTFA audit letter?
ARC · California sales & use tax consulting
A CDTFA audit letter means it is time to organize your response—not assume you already owe more tax. Start by confirming what the California Department of Tax and Fee Administration is requesting, which reporting periods are involved, and when a response is expected. Then build a documented plan for providing accurate records and addressing questions.
- Verify the correspondence and identify the assigned auditor.
- Record the periods, requested information, and response dates.
- Choose who will coordinate communications.
- Preserve and organize the relevant business records.
- Clarify the audit plan and any practical difficulties promptly.
- Review findings and track any later formal notice separately.
For assistance with a pending audit, explore ARC’s California sales tax audit defense and representation services.
Is your CDTFA letter actually an audit notice?
Not every CDTFA letter starts an audit. Before searching for a response template, identify the letter title, form number, account, periods, and instructions. The official CDTFA letters and notices directory explains many common notices and where to locate their identifiers.
| Correspondence | Main distinction | Practical first step |
|---|---|---|
| Audit engagement letter | Establishes contact or confirms an audit’s start. | Identify the auditor and arrange the initial discussion. |
| Information/Document Request | A specific request during an audit; distinct from the engagement letter. | Track each requested item and response date. |
| Notice of Determination | A formal determination of liability with a separate dispute procedure. | Review the notice’s petition instructions immediately. |
| Statement of Account | Reports an account balance rather than necessarily starting an audit. | Reconcile the balance with returns and payments. |
The distinction between an engagement letter and an Information/Document Request appears in Regulation 1698.5, Audit Procedures. Save the complete correspondence, including attachments, rather than relying on a photo of the first page.
Six practical steps after receiving a California sales tax audit letter
1. Verify the request before sharing sensitive information
Use an independently located official CDTFA contact channel if you are unsure who sent the letter. Keep a copy of the request and a written note of the verification. Do not upload accounting data through an unfamiliar link simply because an email refers to a tax audit.
2. Create a deadline and correspondence log
Record the letter date, when it arrived, the auditor’s details, the identified periods, and each requested action. Separate a requested appointment date from a records-production date. Use one shared log so the owner, bookkeeper, and consultant do not work from different assumptions.
Do not assume every audit letter has the same 14-day or 30-day response window. Read your instructions and clarify uncertainty with the assigned office. An appointment discussion is not a substitute for handling a later statutory deadline.
3. Select one person to coordinate the response
A designated coordinator can track requests, schedule discussions, and maintain the document index. Other staff can contribute records without independently sending overlapping explanations. Consider experienced CDTFA audit representation when the issues are complex or the business lacks time to manage the process.
4. Preserve the original records
Before changing software or migrating systems, preserve the underlying records relevant to the audit. Keep original exports separate from working spreadsheets. If a reconciliation needs correction, retain the original and document the correction rather than silently overwriting it.
5. Discuss the audit plan and records availability
Regulation 1698.5 addresses audit plans, conferences, explanations of requests, and difficulties producing information. Ask for clarification when you do not understand what a request seeks. If records are unavailable, explain the issue and discuss suitable alternatives instead of ignoring the request. Read the audit procedures regulation.
6. Maintain a clear submission trail
Use a submission index listing the file name, relevant period, request it answers, date provided, and delivery confirmation. Check that exported reports cover the intended dates and business locations. Send a clear explanation of known limitations, such as a missing month, rather than letting an incomplete file appear complete.
What records should you organize for a CDTFA audit?
The actual request governs what must be provided. Regulation 1698, Records requires records needed to determine the correct sales and use tax liability, including supporting business records and applicable electronic data. The following is an organizational checklist, not an instruction to submit every item automatically.
- Filed returns: period-by-period sales and use tax returns and supporting worksheets.
- Sales: transaction reports, invoices, credit memos, refunds, and location detail.
- Purchases: vendor invoices, equipment purchases, and purchase-tax records.
- Accounting: general ledger reports and reconciliations connecting source records to returns.
- Deductions: resale certificates and documents supporting claimed exemptions or nontaxable transactions.
- Correspondence: prior requests, responses, and relevant explanations.
Build a records map before the first large submission
For each report, identify its source system, date range, responsible employee, and relationship to the filed return. A well-labeled spreadsheet is easier to assess when someone can trace its figures back to invoices or original transaction data.
A business has three reports labeled “sales”: an invoice register, a payment report, and a ledger summary. They may describe different activity or timing. Before drawing conclusions from a difference, document what each report includes and prepare a reconciliation. A numerical mismatch is a question to investigate, not an explanation by itself.
Questions to ask before the audit gets underway
Use the initial discussion to remove practical ambiguity. These questions provide a preparation agenda:
- Which accounts, locations, and reporting periods are included?
- What records are requested first, and in which format?
- How should questions and document submissions be delivered?
- Who should be included in status discussions?
- If testing or sampling is proposed, how will the selected records represent the business activity?
- How will findings and supporting schedules be shared for review?
Prepare a short factual summary of major operational changes—new locations, software migrations, acquisitions, or changes in products. Explain the relevant dates and supporting records. Avoid guessing why the business was selected or volunteering conclusions that have not been checked.
What if you need more time?
Raise scheduling problems early and propose a practical delivery plan. Ask for written confirmation of any agreed arrangement. Separately, a waiver of limitations affects the period for issuing a determination or refund notice. Understand its specific terms before signing; it is not simply an ordinary appointment extension. Regulation 1698.5 explains these waivers.
What happens after the auditor reviews your records?
CDTFA’s Publication 76, Audits, explains initial arrangements, examination, findings, and later notices. An audit evaluates reporting accuracy; additional tax is not a predetermined result. Both underpayments and overpayments are considered.
- 1 · UnderstandIdentify the request, periods, and contacts.
- 2 · OrganizeMap records and track submissions.
- 3 · ReviewExamine issues, calculations, and explanations.
- 4 · RespondAddress findings and handle formal notices promptly.
When reviewing a proposed adjustment, ask which transactions or assumptions support it. Prepare a concise issue list: the disputed figure, why it needs review, and the documents that address it. A supported explanation is more useful than a general statement that the result feels too high.
Could the review identify overpaid tax?
Yes. An agency audit and a business-initiated refund review are different engagements, but overpayment questions may deserve attention. Learn about California sales tax refunds and reverse audits. Manufacturers and processors can also explore ARC’s manufacturing sales tax exemption services, food processing tax exemption services, and winery sales and use tax consulting. Eligibility requires transaction-specific review.
Put Decades of California Sales Tax Experience Behind Your Audit Response
A CDTFA audit letter puts your business’s sales tax reporting under review. How you prepare matters. You need to understand what the auditor is requesting, organize the records that support your returns, and address questions before misunderstandings become disputed findings. ARC’s California sales tax audit defense and representation services help businesses build a clear, documented response.
Joan Armenta-Roberts brings experience from both sides of the audit process: 17 years with the California State Board of Equalization, including work as a tax auditor, followed by 18 years in public accounting at KPMG and PwC. That background informs ARC’s approach to examining audit issues, identifying questions that need closer review, and presenting the records and explanations that support your position. Learn more about Joan and the ARC team.
Your business deserves more than a rushed document submission. Whether the audit involves reported sales, questioned deductions, equipment purchases, or industry-specific exemptions, ARC can help evaluate the facts and applicable California sales and use tax rules. Read more about ARC and see client testimonials.
Before you navigate the audit alone or let a response date pass, get an experienced review. Contact ARC to discuss your CDTFA audit letter, or call Joan at 916-947-5160 or Zach at 213-453-1816. Have your complete letter available so the team can assess the requested records, response dates, and next steps.
Frequently asked questions about CDTFA audit letters
Does an audit letter mean I owe additional sales tax?
No. An audit examines whether reporting was correct. CDTFA’s audit publication addresses underpayments and overpayments, and an audit may result in no change.
Is a CDTFA audit letter the same as a Notice of Determination?
No. An engagement letter starts contact about an audit. A Notice of Determination is a formal liability determination with separate response instructions and petition rights.
How quickly should I respond?
Review the letter promptly and follow its requested dates. Do not apply one deadline to every type of correspondence. Formal determinations require separate deadline review.
What if some records are missing?
Document what is unavailable and why. Raise the issue promptly and discuss alternative sources with the auditor and your representative. Never create or alter records to disguise a gap.
Should I send every accounting file immediately?
Read the request and clarify what is needed. Prepare accurate, organized submissions responsive to the request, meet applicable obligations, and keep a record of what you provide.
Can I request help before speaking with the auditor?
Yes. You can contact a consultant to discuss preparation, communications, and representation. Do not let the search for assistance cause you to miss an existing response date.
How long will the audit take?
Timing varies with the business, issues, records, and coordination. Ask about the audit plan and communicate promptly about obstacles rather than relying on a standard completion estimate.
Does ARC help with sales tax audit defense?
ARC offers California sales and use tax consulting and audit defense services. Contact ARC to discuss your notice and whether an engagement fits your needs.
Your CDTFA Audit Response Deserves Experienced Representation
Get clarity before your next response is due. Talk with ARC about what CDTFA is requesting, the issues your business needs to address, and how experienced sales tax representation can help you prepare.
Have your complete audit letter and any records requests available when you call so the team can assess your situation and urgency.
Joan: 916-947-5160
Zach: 213-453-1816
Explore ARC’s audit defense services · More sales and use tax articles