Free Tax Guide
Negligence Penalties in California Sales Tax Audits
Key Takeaway
California negligence penalties under RTC §6484 add 10% to any sales tax deficiency caused by failure to exercise ordinary care. They are the standard audit penalty unless the taxpayer establishes reasonable cause under RTC §6592. The short version is that most CDTFA audit assessments include negligence penalties. Defenses include reasonable cause (medical emergency, disaster, records destruction, reliance on professional), industry complexity, and documented good faith compliance efforts.1
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CDTFA negligence penalties add 10% to every assessment unless successfully challenged. This chapter walks through defenses.
The Four Negligence Defense Approaches
StatutoryReasonable Cause
ProfessionalReliance
ProceduralChallenge Finding
DocumentationGood Faith Records
| Defense | Authority2 |
|---|---|
| Reasonable Cause | RTC §6592 |
| Professional Reliance | Good faith reliance on CPA / advisor |
| Procedural Challenge | Challenge IRS factual basis |
| Good Faith Records | Documented ordinary care |
Quick Reference
Jump to: reasonable cause, professional reliance, procedural, or good faith.
1. Reasonable Cause Defense (RTC §6592)
CDTFA abates negligence penalty upon showing of reasonable cause.
If this is you: Specific circumstance caused the deficiency — medical emergency, disaster, records destruction, IRS-caused delay. Document specifically. File reasonable cause request.
Reasonable Cause Strategy
- Identify specific ground.
- Gather contemporaneous documentation.
- Draft narrative statement.
- File with Petition or separate abatement request.
- Appeal denial.
2. Professional Reliance
Good faith reliance on a qualified tax professional can support reasonable cause.
If this is you: CPA or bookkeeper handled the compliance. Document the professional relationship, the advice given, and good-faith reliance. Stronger when the professional is qualified and the position is defensible.
3. Procedural Challenge
Negligence requires CDTFA finding of failure to exercise ordinary care. Challenge the factual basis.
If this is you: Your business exercised ordinary care — clean records, industry-standard practices, professional advisor. The CDTFA negligence finding may not be factually supported. Challenge at Petition.
4. Good Faith Records
Documented good-faith compliance — even where resulting in a deficiency — supports reasonable cause.
If this is you: Your records show efforts to comply. Systematic procedures, training, verification. Good faith compliance supports abatement.
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Negligence Penalty Document Lookup
| Document | Purpose |
|---|---|
| RTC §6484 | Negligence penalty statute |
| RTC §6592 | Reasonable cause abatement |
| Petition for Redetermination | Challenge penalty |
| Reasonable cause statement | Defense narrative |
| Professional reliance documentation | Advisor engagement records |
Negligence Statute
- 3-year audit statute.
- 8-year substantial understatement.
- Unlimited fraud.
- 30-day Petition deadline.
Negligence Abatement Rates
| Defense | Success Rate |
|---|---|
| Reasonable cause documented | ~40% to 55% |
| Professional reliance | ~35% to 50% |
| Procedural challenge | Variable |
| Good faith records | Moderate |
Negligence Escalation
Audit Penalty Applied
CDTFA applies 10% negligence as standard.
Petition Challenge
Raise defenses in Petition for Redetermination.
Appeals Review
CDTFA Appeals applies hazards-of-litigation analysis.
First 48 Hours of Negligence Defense
- Identify specific defense.
- Gather documentation.
- Draft narrative.
- Include in Petition for Redetermination.
- Engage counsel for complex defenses.
★Brotman Law has contested CDTFA negligence penalties across industries. Based in San Diego.
The ROI Question
Negligence penalty is 10% of assessment. Professional defense frequently eliminates the penalty entirely — meaningful savings on material cases.
Facing a California Sales Tax Audit?
CDTFA audits move quickly once a notice arrives. The direction of the audit is largely set by how you handle the initial document request and auditor interview. If you’re at any stage — from notice through assessment — we can review where things stand and identify what options are available.
Discuss My Sales Tax Audit → Or call: (619) 378-3138
When to Engage Attorney
- Penalty over $5,000.
- Large underlying assessment.
- Prior abatement denied.
- Multiple years.
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Guide Chapters
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Frequently Asked Questions
What are CA negligence penalties in sales tax audits?
10% penalty under RTC §6484 for deficiencies caused by failure to exercise ordinary care. Standard CDTFA audit penalty unless taxpayer demonstrates reasonable cause under RTC §6592.
Can I abate a negligence penalty?
Yes. Reasonable cause under RTC §6592 — documented illness, disaster, records destruction, reliance on qualified professional, first-time compliance error, or procedural challenge to the negligence finding itself.
What is reasonable cause for CA negligence?
Specific circumstances beyond taxpayer control that caused the compliance failure. Medical emergency, natural disaster, records destroyed by fire, reliance on qualified tax professional who erred despite reasonable instructions.
Does CDTFA always find negligence?
No. Auditor must find actual failure of ordinary care. Clean records, industry-standard practices, and documented compliance procedures support challenging the negligence finding itself.
Is professional reliance a valid defense?
Yes, in good faith. Engagement of qualified CPA or tax advisor, provision of complete information, reliance on actual advice — all support reasonable cause. Must be documented.
What documentation do I need?
Contemporaneous records of the specific ground — medical records, disaster declarations, insurance claims, professional engagement letters, tax advice, internal compliance procedures. Narrative statement connecting the facts to the deficiency.
Can I argue first-time compliance error?
Sometimes. New business, new product line, new tax rule. First-time compliance error can support reasonable cause when documented with good-faith effort to comply. Case-specific.
How much can negligence penalty reduce?
From full 10% of assessment to zero. Successful abatement eliminates the penalty portion. Partial abatement is less common. Appeals typically takes 6-12 months.
What if my preparer made the error?
Professional reliance defense. Document the engagement, the information provided, and the specific advice relied upon. Reliance on a qualified professional who erred — despite the taxpayer’s good-faith actions — supports reasonable cause.
Are CA penalties different from IRS penalties?
Similar concepts but different statutory framework. California reasonable cause standard is stricter than IRS. RTC §6592 requires specific circumstances; IRM 20.1.1 has broader categories. Practical approach is similar: document specifically.
Can I appeal to OTA for penalty issues?
Yes. After CDTFA Appeals denial, OTA review is available. OTA reviews penalty determinations including reasonable cause defenses. Formal hearing with written briefs.
Will interest continue if penalty is abated?
Interest on the penalty is eliminated when the penalty is abated. Interest on underlying tax continues unless separately abated under §6404(g) equivalent or CDTFA-caused delay.
What is CDTFA's fraud penalty vs. negligence?
Negligence: 10% for failure of ordinary care. Fraud (RTC §6485): 25% for deficiencies caused by fraud. Fraud requires CDTFA proof by clear and convincing evidence. Different statutory requirements and defenses.
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