How Long Does a CDTFA Audit Take?

One of the first questions business owners ask after receiving a CDTFA audit notice is: how long is this going to take? It's a reasonable question — audits disrupt operations, consume management time, and create uncertainty that's hard to plan around.

The honest answer is that CDTFA audits vary widely in duration. Some are resolved in a matter of months. Others stretch on for two years or more. Understanding what drives that variation helps you set realistic expectations — and take steps to keep your audit moving efficiently.

The typical CDTFA audit timeline

Most CDTFA sales tax audits follow a predictable sequence of phases, even if the time spent in each phase differs from case to case.

Phase 1: Pre-audit (weeks 1–8)

After the notice is issued, there's usually an initial period before the first formal audit appointment. This is when the auditor reaches out to schedule the opening conference, you (or your representative) request records, and preliminary discussions about scope and logistics take place. This phase typically runs four to eight weeks, though it can be extended if you request a postponement.

Phase 2: Fieldwork (months 2–6)

Fieldwork is the core examination phase. The auditor reviews your records, asks follow-up questions, and applies whatever sampling or estimation methodology they've chosen. For businesses with organized records, this phase can move quickly. For those with incomplete or complex records, it can stretch considerably longer.

Common factors that extend fieldwork include large transaction volumes requiring statistical sampling, multiple business locations, industries with complex taxability rules (restaurants, construction, cannabis), and incomplete or disorganized records.

Phase 3: Preliminary findings (months 4–12)

After fieldwork wraps up, the auditor prepares a preliminary audit report summarizing their findings and proposed assessment. This is a critical phase — it's your opportunity to review the methodology, dispute errors, and present additional documentation before a final determination is issued. Do not treat the preliminary findings as final. Many audits are significantly reduced at this stage through proper advocacy.

Phase 4: Closing and determination (months 6–18+)

After preliminary findings are discussed and any adjustments made, the CDTFA issues a Notice of Determination (NOD) with the final assessed amount. If you accept the determination, the audit closes. If you disagree, you have 30 days to file a petition for redetermination — which begins the appeals process and adds additional time.

What makes CDTFA audits take longer

Poor record organization. When records are incomplete, fragmented, or hard to retrieve, auditors spend more time — and often resort to less favorable estimation methods that require additional rounds of review.

Complex industries. Restaurants, construction contractors, cannabis businesses, and auto dealers all involve nuanced taxability questions that take longer to work through than simpler retail operations.

Disputes over methodology. If you or your representative contest the auditor's sampling approach or estimation technique, additional time is needed to present alternative methods and negotiate.

Auditor workload. CDTFA auditors carry active caseloads. Scheduling delays, staff turnover, and auditor reassignments can all add weeks or months to a case.

Appeals. If the audit determination is appealed to the CDTFA Appeals Bureau or the California Office of Tax Appeals (OTA), the total process from initial notice to final resolution can easily run three to five years.

What you can do to keep your audit on track

• Retain representation early. A qualified California sales tax representative knows how to move audits forward efficiently and avoid delays caused by missteps.
• Organize your records before the audit begins. The cleaner your records, the faster the auditor can complete fieldwork.
• Respond promptly to information requests. Delays in producing requested documents give auditors reason to extend their timeline.
• Don't let preliminary findings sit unchallenged. Engage with the preliminary report promptly — waiting until the last minute compresses your options.

A word on statute of limitations

The CDTFA generally has three years from the due date of a return to issue an assessment for that period — though this can be extended in cases involving a return filed late, fraud, or a failure to file. Understanding where the statute of limitations stands for your audit period is an important part of evaluating your options.

The bottom line

A straightforward CDTFA audit with organized records and qualified representation can often be resolved in six to twelve months. Complex cases, contested methodologies, or appeals can run significantly longer. What you control is your preparation and representation — both of which have a measurable impact on how long your audit takes and how it resolves.