What Triggers a California FTB Audit? (Orange County Guide)
The California FTB Is Always Watching
Wondering what triggers a California FTB audit? Whether you’re a business owner or individual taxpayer, the Franchise Tax Board uses both automated systems and red flag criteria to select returns for audit.
These audits can be triggered by mismatched 1099s, income discrepancies, aggressive deductions, or referral from another agency like the IRS.
In this guide, we’ll explain the most common FTB audit triggers, how to avoid unnecessary risk, and what to do if you've already been contacted. We help taxpayers across Orange County prepare for — and survive — California FTB audits with confidence.
What Is a California FTB Audit?
An FTB audit is an in-depth review of your California state tax return(s), income, and financial activity to verify the accuracy of what you’ve reported — or what the FTB believes you failed to report.
You may be audited as an:
- Individual taxpayer (especially high earners or non-filers)
- Business owner (including S corps and LLCs)
- Independent contractor or gig worker
- Self-employed professional
- Out-of-state taxpayer with California-source income
Top 10 Triggers for a California FTB Audit
1. Unfiled Tax Returns (Delinquency)
One of the most common FTB triggers is failure to file. The FTB cross-references data from:
- Employers (W-2s)
- Contractors (1099s)
- Financial institutions
- IRS records
If they see income reported but no return filed, you’ll likely be flagged. The FTB may even file a Substitute Return for you — often overstating your income and resulting in exaggerated tax liabilities. In some cases, the FTB will create a Substitute Return on your behalf — often inflating your income and resulting in a higher tax bill.
2. Mismatched Income Reporting
If your California tax return doesn't match your federal return, or if it leaves out 1099 income, capital gains, or stock sales, the FTB will notice.
Even minor mismatches can trigger automated notices — and unresolved notices may escalate into full audits.
3. Self-Employment Income Without Documentation
Sole proprietors and 1099 contractors in cities like Santa Ana, Anaheim, and Irvine are often audited if:
- Reported income seems low compared to industry standards
- They deduct business expenses without proper backup
- They fail to pay estimated taxes
The FTB uses data analytics to compare your return to others in your ZIP code and industry.
4. High Deduction-to-Income Ratio
If you claim excessive deductions relative to your income — especially Schedule A or C — you may be flagged for “audit potential.”
Watch out for red flags like:
- Home office deductions that don’t match business activity
- Travel or meal expenses not tied to business
- Charitable contributions that seem inflated
5. Unreported Out-of-State Income
California taxes worldwide income for residents — and California-source income for non-residents. If you live in Orange County but claim to work remotely from Nevada, but your records show otherwise, that can raise an FTB red flag.
6. Residency Issues and Part-Year Filers
Claiming non-residency while maintaining ties to California (e.g., address, employment, voter registration, driver’s license) often triggers an audit. The FTB is aggressive about tracking people who leave the state but still have California-sourced income.
7. Prior Audit History
If you’ve been audited by the IRS or FTB before, you’re more likely to be audited again — especially if:
- You owed substantial tax
- You failed to respond to the audit
- You didn’t comply with a resolution
8. Filing Late — Repeatedly
Filing past the deadline year after year may not trigger an audit by itself, but it can raise your risk score within the FTB’s internal system.
9. Business Owner with 1099 Contractors
If you run a business and misclassify employees as independent contractors — especially in industries like construction, consulting, or design — you may face:
- FTB audit
- EDD (Employment Development Department) audit
- Penalties and reclassification
10. Data Sharing from the IRS
The IRS and FTB share information. If the IRS audits you and finds discrepancies, they notify the FTB — which may launch its own audit based on the same findings.
Don’t go it alone. We help taxpayers across Orange County respond strategically and protect themselves. Schedule a confidential audit defense call today.
How FTB Audits Work (Step-by-Step)
If you've already received a notice, this post breaks down what your FTB letter means and how to respond before deadlines.
- Initial Notice Sent
You’ll receive a letter requesting clarification or documentation. - Audit Initiation
If not resolved, the FTB launches a formal audit. They’ll request: - Bank statements
- Receipts
- Contracts
- Business records
- Travel logs, donation proof, etc.
- Auditor Review
An auditor reviews your file and schedules a phone call or meeting. - Proposed Assessment
If they disagree with your return, they’ll issue a Notice of Proposed Assessment (NPA) — giving you time to protest or amend. - Final Assessment & Collections
If unresolved, the balance becomes due — with penalties, interest, and enforcement actions like liens or levies. If your audit results in additional taxes, here’s how penalties and interest work in California.
What Happens If You Ignore an FTB Audit?
Ignoring audit notices can lead to:
- Automatic tax assessments
- Suspension of licenses (professional, contractor, driver’s license)
- Bank levies or wage garnishments
- Tax liens reported on your credit
- Potential criminal referral for large-scale fraud (rare, but possible)
How to Respond to an FTB Audit
- Read the notice carefully
- Do not respond emotionally or defensively
- Gather all relevant documentation
- Do not call the FTB without professional guidance
- Hire a tax resolution CPA or representative
- Respond before deadlines to protect your rights
How Boulanger CPA Helps with FTB Audits
At Boulanger CPA and Consulting PC, we help Orange County taxpayers through every stage of the audit process. We:
- Review and interpret your audit notice
- Respond directly to FTB auditors on your behalf
- Protect your rights and minimize risk
- Build a proactive strategy to resolve any tax balance
- Help avoid future audits and penalties
Don’t Go Through an FTB Audit Alone
If you’ve received a letter or notice from the Franchise Tax Board — or if you suspect your return may be flagged — get professional help before it escalates. Explore your full California tax relief options — including settlements and payment plans — before collections begin.
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Call Boulanger CPA at
657-218-5700
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Schedule a consultation
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Frequently Asked Questions
What is the most common trigger for a California audit?
Unfiled returns, mismatched income reporting, and excessive deductions are some of the top triggers.
How does the FTB choose who to audit?
The FTB uses analytics to flag returns that don’t match IRS data, industry averages, or reported income. It also audits based on residency issues and prior history.
Can I avoid an audit?
You can’t prevent one entirely, but you can reduce your risk by filing timely, keeping good records, and avoiding inflated deductions.
What should I do if I receive an FTB audit letter?
Don’t respond without guidance. Contact a CPA right away to help you understand the letter and prepare the correct response.
📣 About the Author
Marc Boulanger, CPA is the founder of Boulanger CPA and Consulting PC, a boutique tax resolution firm based in Orange County, California and trusted by high-income individuals and business owners across Southern California.
He is the author of Defend What’s Yours: A California Taxpayer’s Guide to Beating the IRS and FTB at Their Own Game, available now on Amazon. The book offers a step-by-step plan for resolving IRS and FTB tax debt without losing your business, your home, or your peace of mind.
With over a decade of experience resolving high-stakes IRS and State tax matters, Marc brings strategic insight to complex cases involving wage garnishments, bank levies, unfiled returns, and six-figure tax debts. He is known for helping clients reduce or eliminate tax liabilities through expertly negotiated settlements and compliance plans.
Marc is a Certified Public Accountant licensed in California and Oklahoma and holds the designation of Certified Tax Representation Consultant. He is a member of the American Society of Tax Problem Solvers (ASTPS) — the national organization founded by the educators and practitioners who have trained thousands of CPAs, EAs, and tax attorneys in IRS representation strategy.
Every case is handled with discretion, proven methodology, and direct CPA-led representation — not call center scripts.
📍 Learn more at www.orangecounty.cpa or call (657) 218-5700.
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