The CDTFA has its own criminal investigators, and a routine sales tax audit can become a criminal case without anyone telling you the ground has shifted. The agency’s Investigations Bureau handles criminal probes into evasion and fraud involving sales, use, fuel, tobacco, and cannabis taxes — and it does not prosecute cases itself. It builds them, then refers them to county district attorneys or the California Attorney General. If you are reading this because an audit has started to feel like something else, the distinctions below matter.
By Sam Brotman, JD, LLM, MBA · Last updated August 2026
Can a CDTFA audit turn into a criminal investigation?
Yes — and the escalation is usually invisible from the taxpayer’s side. Auditors are trained to spot fraud indicators and route them to the Investigations Bureau without announcing it. The patterns that escalate: a second set of books, point-of-sale records that do not match reported receipts, markup analysis that says the register saw far more than the returns did, and — the most serious pattern in sales tax — tax that was collected from customers and never remitted. That last one reads as taking money held for the state, and it changes how everyone downstream treats the file. This is the sales tax version of the eggshell audit: a civil exam sitting on top of criminal exposure, where every document response needs to be made with the referral risk in mind.
What the Investigations Bureau actually does
Real criminal process: search warrants, seized business and digital records, witness interviews, and bank analysis. The Bureau works its own cases and works jointly with the California Department of Justice and federal agencies on larger enforcement actions — untaxed product, suppression schemes, organized evasion. Investigators can show up at the business, at your home, or at your bookkeeper’s office. Anything said in those conversations is evidence; the polite interview at the counter is part of the file.
What are the criminal statutes for California sales tax?
The core provisions are Revenue & Taxation Code §§ 7152, 7153, and 7153.5 — evasion with intent, willfully false returns, and the felony provision: where unreported tax liability crosses $25,000 in a twelve-month period, the exposure is a felony with fines and state prison on the table, plus restitution. California law also separately criminalizes automated sales suppression software — the “zapper” programs some POS vendors quietly sold — and using one is its own problem independent of the tax. Convictions carry consequences beyond the sentence: licensing boards, ABC licenses, and lender relationships all react.
Does the civil case stop while the criminal case runs?
No. The two tracks run in parallel, and they trade information. The assessment, penalties, and interest keep building on the civil side while the Bureau works the criminal side — and positions taken in one show up in the other. This is why defending a CDTFA criminal matter is inseparable from the underlying sales tax work: the markup analysis, the exemption documentation, and the audit method disputes are both the civil defense and the criminal defense. A settlement posture on the civil case that ignores the criminal exposure — or the reverse — is how these get worse.
What to do if CDTFA investigators contact you
Identify yourself, take their cards, say nothing else, and call counsel the same day. Do not consent to an interview, do not hand over records without process, do not amend anything, and do not clean up files — conduct after contact is often easier to prosecute than the tax itself. If the contact came mid-audit, tell your representative immediately; the audit strategy has to change the moment the file has criminal color.
Brotman Law handles CDTFA matters at every stage — sales tax audits and appeals, criminal tax defense, and the cases that sit in between. For how the agency itself works, see our complete guide to the CDTFA.
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