The California Office of Tax Appeals

The Office of Tax Appeals is where California tax disputes are decided by someone other than the agency that assessed them. It was created by the Taxpayer Transparency and Fairness Act of 2017, which took tax appeals away from the elected Board of Equalization and placed them before independent Administrative Law Judges.

That independence is real and it matters. Appeals are heard by panels of three ALJs who do not work for the Franchise Tax Board or CDTFA, and OTA publishes precedential opinions that can be cited in later matters.

It is also a forum most national tax firms never appear in. We represent taxpayers before OTA from offices in Temecula and San Diego, serving Riverside, San Bernardino, and Murrieta.

What OTA Hears — and What It Does Not

OTA has jurisdiction over appeals from the FTB (personal income tax, corporate franchise and income tax) and from CDTFA (sales and use tax and the special taxes and fees it administers).

It does not hear EDD matters. Employment tax assessments are petitioned to the California Unemployment Insurance Appeals Board, a different body with different procedures. Businesses facing simultaneous examinations frequently assume one appellate path covers everything; it does not.

Getting to OTA

OTA is not the first step. Each agency has its own internal process that must be exhausted first, and the deadlines along the way are short.

FTB track:

1. Notice of Proposed Assessment — 60 days to file a written protest
2. Protest hearing before an FTB hearing officer
3. Notice of Action — the protest decision
4. Appeal to OTA, generally within 30 days

CDTFA track:

1. Notice of Determination — 30 days to file a Petition for Redetermination
2. Appeals Bureau conference and written Decision and Recommendation
3. Appeal to OTA, generally within 30 days

Refund claims follow a parallel route: a denied claim can be appealed to OTA on the same timeline.

Missing an earlier deadline forecloses OTA entirely. A CDTFA determination not petitioned within 30 days becomes final, due, and payable, and the only remaining path is to pay in full and file a refund claim — which then generates its own appeal rights, but only after funding the entire liability.

How an Appeal Actually Runs

An appeal is opened by a written request identifying the notice, the amounts, and the issues. OTA then sets a briefing schedule: the taxpayer’s opening brief, the agency’s response, and a reply.

An oral hearing is optional and must be requested. Many appeals are decided on the written record alone. Hearings are conducted before the three-judge panel, and they are less formal than court — the rules of evidence do not apply in the strict sense, and judges question both sides directly.

Representation is permitted by an attorney, CPA, enrolled agent, or any authorized representative. Taxpayers may also appear on their own behalf.

After the record closes, the panel issues a written opinion, generally within 100 days. A petition for rehearing may be filed within 30 days on limited grounds — an irregularity in the proceedings, an error in law, insufficient evidence, or newly discovered evidence.

Some opinions are designated precedential and may then be cited in later appeals. Non-precedential opinions still indicate how panels have approached similar facts, which makes reviewing published decisions genuinely useful preparation rather than an academic exercise.

Where It Ends

The two agencies diverge sharply after OTA, and this drives strategy.

FTB matters. An OTA decision adverse to the taxpayer can be taken to Superior Court — but only through a refund action, which requires paying the liability in full first. The FTB generally cannot appeal an OTA decision that favors the taxpayer. That asymmetry means an OTA win in an income tax case is usually the end of the matter, while a loss requires funding the entire assessment before a court will hear it.

CDTFA matters. A similar pay-first refund action applies for further review.

The practical consequence is that OTA is frequently the last realistic forum, not an intermediate step. Cases should be built for it accordingly rather than treated as a stop on the way to court.

What Wins at OTA

The appeals that succeed tend to share features, and they are not primarily about legal argument.

The record was built earlier. OTA reviews what was developed during the protest or Appeals Bureau stage. A thin protest produces a thin appeal, because new evidence introduced late is treated skeptically and the agency will point out that it was never given the chance to consider it.

The dispute is factual and documented. Residency cases turn on the closest-connections analysis — where the home, family, licenses, physicians, and accounts actually were. Substantiation cases turn on records. Sales tax cases usually turn on whether the auditor’s estimation method was appropriate for the business, which is provable with the taxpayer’s own data.

The method is attacked, not just the result. In CDTFA appeals, showing that an observation test period was unrepresentative, or that a markup percentage ignored discounting and spoilage, is far more effective than asserting the assessment is too high.

Published opinions are cited. Panels respond to being shown how comparable facts were decided previously.

Residency and sourcing appeals are a meaningful share of the FTB docket, which reflects how actively California examines departures — residency audits of out-of-state filers rose 126% between 2019 and 2023.

Costs, Timing, and Whether to Appeal

Appealing is not automatically the right decision, and the calculus differs from federal practice in ways worth understanding before committing.

There is no filing fee to appeal to OTA, which removes one barrier that exists in court. The costs are professional fees and time — a full appeal commonly runs a year or more from filing to opinion.

Interest continues to accrue on the disputed liability throughout. A taxpayer who expects to lose is generally better off paying the assessment and pursuing a refund claim, which stops the interest from compounding while preserving the dispute. A taxpayer with a genuine factual defense is usually better off appealing, since the alternative — paying in full to reach Superior Court — requires funding the entire liability.

Two considerations tilt toward appealing. Collection is generally held during a properly filed appeal, which matters for a taxpayer who cannot pay the assessment now. And because the FTB generally cannot appeal an adverse OTA decision in income tax matters, a win is usually final rather than the start of another round.

The consideration that tilts against is a weak record. If the protest stage produced little documentation and there is nothing new to add, an appeal is unlikely to change the result and will add a year of accruing interest to the same outcome.

Frequently Asked Questions

Is OTA independent of the FTB?

Yes. It is a separate state agency, and appeals are decided by panels of three Administrative Law Judges who do not work for the FTB or CDTFA.

What is the deadline to appeal to OTA?

Generally 30 days from the FTB’s Notice of Action or CDTFA’s Appeals Bureau decision. The earlier deadlines — 60 days to protest an FTB assessment, 30 days to petition a CDTFA determination — must be met first or OTA is unavailable.

Do I have to attend a hearing?

No. An oral hearing must be requested, and many appeals are decided on the written record.

Can I represent myself?

Yes, and the process is designed to be accessible. Representation is permitted by an attorney, CPA, enrolled agent, or other authorized representative.

Does OTA hear EDD cases?

No. Employment tax assessments go to the California Unemployment Insurance Appeals Board, a separate body with its own procedures.

What happens if I lose at OTA?

For FTB matters, further review requires paying the liability in full and filing a refund action in Superior Court. Because of that, OTA is often the last practical forum.

Can the FTB appeal if I win?

Generally not in income tax matters, which makes a favorable OTA decision typically final.

How long does an appeal take?

Briefing and scheduling take several months, and an opinion generally issues within about 100 days after the record closes. A full appeal commonly runs a year or more from filing.

Can I introduce new evidence at OTA that I did not give the agency?

You can submit it, but panels treat late evidence skeptically and the agency will point out it never had the opportunity to consider it. Evidence developed at the protest or Appeals Bureau stage carries considerably more weight, which is the main argument for preparing that stage as though an appeal is coming.

Are OTA opinions public?

Yes. Opinions are published, and some are designated precedential and may be cited in later appeals. Reviewing decisions on comparable facts is genuinely useful preparation rather than an academic exercise.

Build the Case Before the Appeal

OTA decides on the record it receives, and most of that record is created during the protest or Appeals Bureau stage — often before anyone is thinking about an appeal at all. The strongest OTA cases are the ones prepared as though they would be appealed from the beginning.

Pietro Canestrelli holds an LL.M. in Taxation and represents taxpayers before the Office of Tax Appeals, the FTB, CDTFA, the EDD, and the IRS. Schedule a consultation, or review our FTB and CDTFA practice pages.