The Ultimate Guide to California Sales Tax Audits

Written by Sam Brotman, Esq.

| Updated March 2026 18 min read

What You'll Learn

This comprehensive guide covers every aspect of the topic in detail. Click any chapter below to dive in.

Chapter 1 What Is California Sales Tax? Chapter 2 What Triggers a Sales Tax Audit? Chapter 3 Risks for Small Businesses in CDTFA Audits Chapter 4 The Sales Tax Audit Process Chapter 5 How to Prepare for a Sales Tax Audit Chapter 6 How to File a Sales Tax Audit Appeal Chapter 7 Should I Hire a Sales Tax Lawyer? Chapter 8 What Is Use Tax in California? Chapter 9 Secrets of a Sales Tax Audit Defense Chapter 10 Your Rights as a California Taxpayer Chapter 11 What Is Tax Audit Sampling & Testing? Chapter 12 Sales for Resale & Resale Audits Chapter 13 Penalties in a Sales Tax Audit Chapter 14 Requirements for Out-of-State Retailers Chapter 15 Negligence Penalties in Sales Tax Audits Chapter 16 California Sales Tax Exemptions

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CA Sales Tax Audits FAQs

How long do I have to respond to an IRS audit notice?

Typically 30 to 60 days from the date on the notice. However, some notices have shorter or longer deadlines. Don't wait — contact us as soon as you receive any correspondence from the IRS.

Can the IRS audit me if I used a CPA to prepare my return?

Yes. Using a CPA doesn't prevent an audit. You are ultimately responsible for the accuracy of your return, regardless of who prepared it. However, having professional representation during the audit is critical.

What if I can't find the documents the IRS is requesting?

We can often reconstruct records using bank statements, third-party records, and other sources. The sooner you engage us, the more options we have to build your case.

Will an audit affect my future tax returns?

Not directly. However, if the IRS made adjustments, those changes may affect carryforward items like losses or credits. We'll review the impact and make sure your future returns reflect the correct figures.

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