Restaurants are a top CDTFA target because of high cash and tip volume. Auditors observe a single day, compute a ratio, then project it (extrapolate) across three years — sending the assessment soaring. We use your real numbers and statistical modeling to prove that figure is wrong.
Because so many customers pay cash and leave tips, a restaurant's true revenue is hard to verify on paper alone. CDTFA knows this, so they use estimation methods — like the credit-card-to-total-sales ratio — to infer the revenue they claim you underreported.
The problem: if the single day an auditor observes has an unusually high card ratio (rainy day, fewer cash tips), the extrapolated number is wildly off. That's exactly where we push back.
Credit-card / cash ratio — Auditors take a few days' ratio and multiply across years — rarely reflecting your real business.
Comps & voids — POS comp/void records can be misread as hidden revenue, inflating the assessment.
Alcohol-to-food ratio — CDTFA uses beverage ratios to estimate total sales — a method that is highly contestable.
Tip reporting — Improperly handled tips can be wrongly folded into taxable sales.
We build statistical models from your real Z-tapes, bank statements, and POS reports to show CDTFA's extrapolation methodology doesn't hold up. This is expertise most tax offices simply don't have.
Read: Anatomy of a CDTFA restaurant audit →The information request usually gives 30 days. Don't ignore it — but don't submit everything blindly either. What you provide shapes the whole audit. Call us before you respond.
Your CPA can handle bookkeeping, but if CDTFA proposes an assessment requiring statistical defense, most CPAs don't have that expertise. We're often brought in mid-audit when the CPA realizes the methodology challenge is beyond accounting.
Even with real underpayment, CDTFA's extrapolation is almost always negotiable. We've reduced assessments 40–80% where the methodology was overreach.
If CDTFA has contacted you — even informally — call us. The first 30 days of an audit shape its trajectory. Free consultation, no obligation. We speak English and Vietnamese.
(408) 287-1888
We respond within 1 business day.