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If you operate a business in California, you’ve likely heard of the California Department of Tax and Fee Administration (CDTFA). This state agency is responsible for administering sales and use tax, along with a variety of special taxes and regulatory fees. One of the CDTFA’s most powerful enforcement tools is the sales tax audi, a comprehensive review designed to ensure businesses are properly reporting and remitting tax on taxable transactions.
CDTFA audits are highly targeted and often industry-specific. Auditors employ a wide range of methods, including cash-to-credit card ratio analysis, use tax compliance reviews, markup percentage tests, Amazon and online sales scrutiny, alcohol pour tests, and close examination of food sales, such as hot vs. cold items and dine-in vs. takeout transactions. These audits can be aggressive, time-consuming, and involve a detailed inspection of financial records, sales reports, and other complex documentation.
At Dallo Law Group, our experienced California sales tax attorneys work with businesses across the state to proactively address CDTFA inquiries, mitigate audit exposure, and maintain full tax compliance.
In this post, we’ll break down the most common mistakes businesses make during CDTFA audits, and how you can avoid them.
Audit Triggers: How CDTFA Spots the Gaps in Your Books
One of the most common and costly mistakes we see in CDTFA sales tax audits is the issue of unreported or underreported sales. A large percentage of audits are initiated when a business’s total reported sales, especially credit card transactions, don’t match the financial data available to taxing authorities. The CDTFA routinely cross-checks your sales tax returns against third-party data sources like Form 1099-K, bank statements, and merchant processor reports to identify discrepancies.
For example, if your sales tax return shows $75,000 in credit card sales, but your payment processor reported $100,000 to the IRS, this discrepancy may trigger a sales tax audit. The same applies to cash sales. If your cash tracking is inconsistent or incomplete, auditors may presume unreported taxable sales and apply penalties accordingly.
Many business owners mistakenly rely solely on their point-of-sale (POS) system to ensure accurate reporting. However, if your POS isn’t properly configured to distinguish between taxable vs. non-taxable transactions, or if you’re not routinely reconciling POS data with bank deposits and sales tax returns, you could be exposing your business to significant audit risk. Even worse, some POS systems default to incorrect tax classifications unless manually adjusted, resulting in sales tax reporting errors and potential audit assessments.
Misclassification of Sales
One of the most overlooked risks in a CDTFA sales tax audit is the misclassification of revenue, specifically, misidentifying taxable vs. non-taxable sales. Many businesses either overestimate or underestimate the portion of their revenue that is subject to California sales tax, often due to the complex and counterintuitive nature of the rules.
Underreporting taxable sales can expose your business to significant sales tax liabilities and penalties. This is especially true in cases where the 80/80 rule applies. Under this CDTFA guideline, if more than 80% of your sales are food and more than 80% of that food is taxable, your business is considered to be primarily engaged in the sale of taxable meals and beverages. As a result, all sales, including cold food to-go, are presumed taxable.
See California Code of Regulations, Title 18, Section 1603(c).
Don’t let Third-Party Delivery Services Become a Blind Spot
Grubhub, Uber Eats, DoorDash, they’re convenient for customers, but a headache if you’re not accounting for them properly. Many restaurant businesses fail to track these third-party delivery sales with the same care as in-house orders. But the CDTFA won’t miss them. These platforms often issue 1099-K forms showing exactly how much was processed through their systems. If your reported sales don’t match those numbers, expect questions from the CDTFA.
The Best Offense is a Good Defense
The habit of keeping good records may be the difference maker for a business under audit. When you don’t have a clear paper trail—bank statements, original sales records, monthly breakdowns, it becomes much harder to defend yourself during an audit. The CDTFA isn’t interested in generalities. They want itemized, monthly-reconciled data. Without it, they may rely on estimates or assumptions that don’t work in your favor.
Don’t wait!
A CDTFA audit doesn’t have to derail your business. With careful preparation, accurate record keeping, and the right professional guidance, you can reduce your risk and navigate the process more effectively.
If you’ve received an audit notice or just want to make sure you’re on the right track, our experienced tax professionals are here to help.
Don’t wait for an audit to find out you’ve made a mistake. Contact Dallo Law today for a confidential consultation, and let us help you get ahead of the curve.
