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What FTB Audit Defense Involves
The California Franchise Tax Board audits personal income tax (PIT) and corporation income tax (CIT) returns under the authority of California Revenue & Taxation Code § 19032 et seq.
The FTB is not a passive agency. It has a full audit division based in Sacramento that conducts both correspondence audits — conducted entirely by mail — and field examinations where an examiner reviews records at the taxpayer's location or representative's office. For higher-dollar returns, residency cases, and complex business income issues, field exams are common.
One distinction this page is specifically about: audit defense (the examination of whether your return is correct) is separate from FTB collections (what the FTB does to collect a balance after assessment). If you have received an FTB notice after a liability has already been assessed and you are dealing with collections — levies, liens, installment agreements — that process is covered separately in the California FTB Collections guide. This page covers the audit side: the proceeding that creates or disputes the underlying liability.
FTB Audit Triggers — Common Issues
FTB audits do not happen at random. They are driven by information matching, federal-to-state conformity adjustments, and risk-scoring models that flag returns with specific characteristics.
Federal-State Conformity Adjustments
This is one of the most common FTB audit pathways, and many taxpayers do not anticipate it. Under R&TC § 18622, when the IRS audits your federal return and assesses additional tax, you are required to notify the FTB of that federal change within six months. The FTB independently evaluates the federal adjustment and typically issues a corresponding Notice of Proposed Assessment (NPA).
The consequence of not reporting a federal change: California's audit statute of limitations opens until the FTB issues its own NPA. The failure to report a federal adjustment is a separate issue from the underlying tax and compounds the problem significantly.
Residency and Domicile
California taxes its residents on worldwide income. A California resident who earned $3M during a year when they claimed Nevada or Texas domicile could owe California tax on the entire amount if the FTB concludes they were still a California resident. These are high-dollar cases and the FTB's residency audit unit focuses on them.
Under R&TC §§ 17014 and 17015, a "resident" is someone domiciled in California or physically present in California for more than nine months (the safe harbor) in the tax year. Domicile is not just where you live — it is where you intend to make your permanent home. A taxpayer can change domicile on paper (new driver's license, new voter registration) while the FTB concludes they never actually left California based on where they spent their time and maintained their closest connections.
The burden is on the taxpayer to prove a change of domicile. That proof requirement is important: the FTB does not need to prove you stayed; you need to prove you left. Residency audits are covered in more detail in the section below.
Schedule CA (California Adjustments) Inconsistencies
California does not conform to all federal tax provisions. Common areas of FTB scrutiny: stock options and restricted stock units with California source income questions for mobile employees (especially for individuals who moved during a vesting period), passive activity losses, net operating loss carryovers (California has its own NOL rules that differ from federal), and California-specific deductions. Returns that show unusual California-federal differences in these areas can draw examination.
Business Income and S Corporations, Partnerships, and LLCs
Any entity doing business in California owes California taxes. The FTB audits businesses where California-source income appears understated or where the apportionment of income to California looks inconsistent with the entity's operations here. Partnerships and S corporations that allocate losses to California partners or shareholders also attract scrutiny when the allocations appear aggressive.
Unreported Income
The FTB runs information matching — comparing W-2s, 1099s, and K-1s reported by payers against the income on your return. A mismatch triggers correspondence. For higher-dollar unreported income, it can escalate to examination.
FTB Audit Statute of Limitations
California gives the FTB four years to audit a return — one year longer than the federal IRS has — and that window can extend significantly under specific circumstances.
The standard California statute: four years from the later of the return's due date or the actual filing date. R&TC § 19057. A return filed April 15 of a given year gives the FTB until April 15 of the fourth following year to issue an NPA.
Extended statute for substantial understatement: if there is an understatement of more than 25% of gross income, California can audit six years back. R&TC § 19059. The IRS's equivalent threshold is the same (25%), but the federal extended period is only six years as well — so the standard versus extended differential plays out similarly, with California starting a year later on the standard statute.
Unlimited statute: fraud and failure to file. R&TC § 19087. There is no time limit. The FTB can assess for any year if it concludes the return was fraudulent or was never filed.
Federal change / open statute: if the IRS adjusts your federal return and you do not report the change to the FTB within six months under R&TC § 18622, California's statute remains open until the FTB issues its own NPA. In practice, this means the FTB can audit a year that would otherwise be closed if the IRS adjusted it and the notification never came.
The FTB Audit Process
FTB audits follow a defined procedural path from initial notice to either resolution or appeal — and each step has deadlines that matter.
The audit typically begins with an initial notice or Information Document Request (IDR) from the FTB's audit division. The IDR identifies the issues under examination and requests specific documents — bank records, brokerage statements, employment records, business financials. How you respond to the IDR shapes what happens next.
After reviewing the documents, the FTB examiner issues proposed audit findings — usually a Notice of Proposed Assessment (NPA). The NPA states the additional tax the FTB proposes to assess, the basis for the adjustment, and the deadline to respond.
Protest: A written protest of the NPA must be filed within 60 days of the NPA's date (R&TC § 19041). The protest goes to the FTB's Protest Division, which conducts an independent review. The Protest Division is separate from the audit division — it functions more like an internal appellate review. A well-prepared protest can resolve issues that the audit division got wrong, and it is often the most efficient place to contest adjustments.
California Office of Tax Appeals (OTA): If the Protest Division's decision is unfavorable, the taxpayer can appeal to the OTA within 30 days of the Notice of Action (the Protest Division's final determination). OTA hearings are conducted by independent administrative law judges — they are not FTB employees. OTA decisions are published and cited, which means the agency has an institutional interest in getting the legal questions right.
Superior Court / Court of Appeal: After exhausting administrative remedies, taxpayers may file suit in Superior Court or the Court of Appeal. This is the litigation path and it is available after the OTA proceeding is complete.
Residency Audit Defense — Special Focus
California residency audits are some of the highest-stakes state tax examinations in the country — California taxes residents on worldwide income, which means the amount in dispute can be substantial for a single year.
The FTB's primary residency audit unit focuses on high-income individuals who claim to have changed domicile out of California. The typical fact pattern: a taxpayer who earned significant income during a year claims Nevada, Arizona, or Texas domicile. The FTB audits the year, reviews the evidence, and disputes the claimed domicile change.
Under R&TC §§ 17014 and 17015, the FTB examines a defined set of factors to determine domicile:
- Location of closest contacts — family ties, where children live, where the taxpayer maintains a primary home
- Business activities — where the taxpayer conducts business, holds board meetings, and maintains professional relationships
- Social memberships — golf clubs, religious organizations, civic memberships
- Voter registration and driver's license
- Where the taxpayer receives medical care
- Days spent in California versus the claimed new domicile state
The FTB has access to credit card records, cell phone location data (through legal process), travel records, and employment records. Taxpayers who maintained substantial California ties — vacation home still in California, children in California schools, California-based business operations — while claiming Nevada domicile face serious examination risk.
Part-year resident returns are also a focus. If you moved during the year, you file a Part-Year Resident return using Schedule CA with part-year information. The FTB audits these when the claimed move-out date is inconsistent with other evidence — payroll records showing California income, rental payments on a California address, or utility records that continue past the alleged move date.
For a detailed breakdown of California's residency and domicile rules, see the complete guide to California personal income tax residency.
How Brotman Law Handles FTB Audits
We represent California taxpayers through every stage of the FTB audit process — from the initial IDR through protest, OTA appeal, and, where necessary, litigation.
Brotman Law has represented 400+ clients in audits since 2013. We handle both federal and state examination defense, which matters in FTB cases: federal and California audits often run parallel, and positions taken in one proceeding affect the other. We coordinate both.
On a typical FTB audit engagement:
We start by reviewing the IDR and identifying the issues under examination before responding to anything. An IDR response that is too broad, too narrow, or poorly organized shapes the audit in ways that are difficult to undo. We prepare the response strategically.
If the FTB's proposed findings are wrong — on the law, the facts, or both — we prepare a substantive protest. The Protest Division is the first forum where you have a real opportunity to argue your position to someone other than the examiner who made the initial determination. In residency cases, the protest is where the factual record gets built.
If the protest does not resolve the matter, we handle OTA appeals. If the matter requires litigation, we handle that too.
What we do not do: accept FTB audit findings because they are inconvenient to dispute. If the FTB's position is wrong, we say so and we document it.
Book a free 15-minute call. I can usually identify within that conversation whether the FTB's position has merit or whether there is a real defense to pursue.
Frequently Asked Questions
How long does an FTB audit take?
It depends on the complexity of the issues and the stage at which the case resolves. A correspondence audit on a straightforward income matching issue can resolve in a few months. A field examination involving residency, S corporation income, or multiple years of adjustments typically runs 12–24 months from the initial notice through the NPA stage. If the matter goes to the Protest Division or the OTA, add another 6–18 months. There is no universal timeline, and the FTB does not have mandatory resolution deadlines for its audit division.
What triggers an FTB audit in California?
The most common triggers: a federal audit with a federal adjustment that you are required to report to the FTB under R&TC § 18622; a residency or domicile question when a high-income individual claims to have changed domicile out of California; Schedule CA income adjustments that appear inconsistent with federal treatment; information matching discrepancies where W-2s, 1099s, or K-1s reported by payers do not match the income on your return; and California-source income reporting by S corporations, partnerships, or LLCs that appears understated.
What is the California FTB audit statute of limitations?
The standard California statute is four years from the later of the return's due date or filing date — one year longer than the federal IRS has. R&TC § 19057. An extended six-year statute applies when there is a substantial understatement of more than 25% of gross income (R&TC § 19059). There is no statute of limitations for fraud or failure to file (R&TC § 19087). If the IRS adjusts your federal return and you fail to notify the FTB within six months under R&TC § 18622, California's statute remains open.
How is an FTB audit different from an IRS audit?
The two often run in parallel, but they are separate proceedings with different agencies, different legal standards, and different procedural rules. California does not conform to all federal tax provisions, so an issue resolved in your favor at the IRS level may still be disputed by the FTB. California's audit statute is four years versus the IRS's three. The administrative appeal path is different: FTB cases go to the FTB's Protest Division and then the California Office of Tax Appeals, rather than IRS Appeals. And California's residency rules — taxing residents on worldwide income — create audit issues the federal IRS does not typically raise.
Can I appeal an FTB audit finding?
Yes. After the FTB issues a Notice of Proposed Assessment (NPA), you have 60 days to file a written protest under R&TC § 19041. The protest goes to the FTB's Protest Division for independent review. If the Protest Division's decision is unfavorable, you can appeal to the California Office of Tax Appeals (OTA) within 30 days of the Notice of Action. After exhausting administrative remedies at the OTA, you can file suit in Superior Court or the Court of Appeal. Each step has firm deadlines — missing the 60-day protest window or the 30-day OTA appeal window forfeits those options.