The opening of a sales tax audit is the most consequential phase of the entire process. Auditors set the scope, select the audit period, choose the sampling methodology, and conduct the initial interviews in the first few weeks. What happens in that window is very difficult to undo later.
Sales tax audits in California are conducted by the California Department of Tax and Fee Administration, or CDTFA. The auditor’s job in the opening phase is to understand your business and design an examination methodology. They will ask questions about your record-keeping, your point-of-sale system, your sales categories, your exemption certificates, and the general flow of your transactions. If you answer those questions without representation, you may inadvertently agree to a sampling period that is unfavorable, consent to a scope that is broader than required, or disclose information about a related entity or prior period that was not originally at issue.
Attorney-client privilege is a real and important consideration here. Communications with a CPA or accountant are generally not privileged under California law for state tax purposes. Communications with a licensed attorney are privileged. This matters because the documentation you gather, the positions you take, and the analysis you conduct during an audit can potentially be used against you in a later administrative appeal or litigation. Structuring that process through legal counsel creates a layer of protection that does not exist if you handle it directly or through an accounting firm.
The audit scope is also much harder to narrow once the auditor has opened it broadly. If you allow the CDTFA to pull all of your sales records for five years and conduct a detailed transaction review, reducing that to a two-year statistically valid sample becomes an uphill argument after the fact. Experienced representatives negotiate the scope, the base period for sampling, and the methodology before the substantive review begins — a negotiation that is essentially impossible once the records have been handed over and the auditor’s conclusions are forming.
The record built during a sales tax audit follows the case through every stage — administrative appeal, Office of Tax Appeals, and potential litigation. Waiting until the audit is over to hire an attorney means you are responding to a record someone else built, under conditions you did not shape.
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