A California Office of Tax Appeals appeal is not a casual letter-writing exercise. It is an administrative tax appeal where the taxpayer must build a record that explains the facts, identifies California’s audit related legal or factual errors, organizes the evidence, and gives the panel a reason to reject the Franchise Tax Board’s or California Department of Tax and Fee Administration’s position. OTA describes itself as an impartial forum for resolving tax disputes between California taxpayers and state tax agencies, and taxpayers may appeal qualifying FTB and CDTFA actions to OTA. But keep in mind, the panel is often made up of ex CDTFA or FTB personnel and the burden of proof is on the taxpayer to prevail.
The opening filing matters more than many taxpayers realize. OTA rules provide that the taxpayer’s appeal letter or appeal form will constitute the appellant’s opening brief unless the appellant requests the opportunity to file a supplemental opening brief. If that request is made at the proper time, OTA generally permits a supplemental opening brief within 60 days from acknowledgment, subject to the applicable page limits. This means a weak, unsupported appeal letter can accidentally become the taxpayer’s main brief unless counsel controls the filing from the outset.
A strong OTA brief does not merely assert that the FTB or CDTFA is wrong. It proves the point with documents, timelines, declarations, accounting schedules, statutory authority, precedential OTA opinions, and credible explanations that are consistent with the record. In residency cases, this may include travel calendars, lease records, bank activity, employment documents, medical records, and family location evidence. In income tax cases, it may mean tracing deposits, basis, source documents, entity records, amended federal outcomes, or apportionment schedules. In sales and use tax cases, it may mean challenging sampling, markup assumptions, cash controls, resale certificates, POS records, invoices, and audit-test-period assumptions. The taxpayer must turn a tax dispute into an organized evidentiary record that answers the exact issue OTA must decide.
OTA Briefing Rules Create Deadlines, Page Limits, and Strategic Traps
OTA briefing follows a structured process. Under the general briefing schedule, the taxpayer’s accepted appeal letter or appeal form functions as the opening brief unless the taxpayer timely requests a supplemental opening brief. The agency then generally files its opening brief within 60 days from OTA’s acknowledgment of the taxpayer’s opening brief, and the taxpayer may file a reply brief within 30 days from OTA’s acknowledgment of the agency’s opening brief. The taxpayer’s reply brief may address only new facts, issues, or arguments raised in the agency’s opening brief.
The formatting rules also matter. Unless OTA directs otherwise, briefs must be legible and no longer than 30 double-spaced pages or 15 single-spaced pages, excluding the table of contents, table of authorities, and exhibits. OTA may return nonconforming briefs, and failure to submit a compliant brief may waive the opportunity to submit it. Extension requests must be made in writing before the scheduled due date, state the reasons for the request, identify the additional time requested, and copy the other party.
This procedure creates a critical strategic point: do not waste the opening brief on background noise. The opening brief should identify the exact notice or agency action, state the issues presented, explain the burden of proof, set out the relevant facts with record citations, apply the law to the evidence, and request specific relief. The reply brief should not repeat the opening brief. It should attack the agency’s weakest assumptions, correct factual misstatements, distinguish precedential authority where useful, and explain why the agency’s proof does not satisfy the governing standard.
If the facts include badges of fraud, concealed income, false invoices, altered books, cash-skimming allegations, or intentionally inaccurate returns, the brief requires even more care. A reckless statement in an OTA filing can create damaging admissions in a parallel or later civil or criminal tax matter. Taxpayers should never use an OTA brief to improvise facts, blame a preparer without support, or submit reconstructed records that cannot withstand scrutiny.
The Evidence Must Does the Work the Argument Cannot
OTA applies evidentiary rules that are more flexible than ordinary courtroom rules, but that flexibility does not make unsupported statements sufficient. OTA rules provide that, except as otherwise stated, California Evidence Code and Code of Civil Procedure witness and evidence rules do not apply to OTA proceedings. Relevant evidence is generally admissible, but the Lead Panel Member may exclude evidence if its probative value is substantially outweighed by the probability that admission will consume undue time. The panel may use California evidence rules when deciding how much weight to give evidence, and a factual finding on a material disputed fact cannot be based solely on unsworn statements in a brief or arguments made by an unsworn representative at an oral hearing.
That rule should shape every OTA brief. If the taxpayer needs OTA to accept a factual claim, the claim should have evidentiary support. Bank statements, contracts, federal transcripts, general ledgers, receipts, invoices, point-of-sale exports, loan documents, declarations signed under penalty of perjury, and third-party records usually carry more weight than narrative explanations alone. OTA permits declarations and affidavits, and its rules specify that declarations should be signed under penalty of perjury and include the required execution language.
In many tax appeals, the winning move is not a clever legal phrase. It is a disciplined record that makes the agency’s position look incomplete, overstated, or unsupported. If FTB assumes domicile based on selected California connections, the brief must present the full factual picture. If CDTFA extrapolates liability from an audit sample, the brief must attack the sample, the projection, the assumptions, and the documentary gaps. If the dispute involves penalties, the brief must separate the underlying tax issue from reasonable cause, reliance, abatement, or burden-of-proof arguments. A brief that does not organize the evidence issue by issue forces OTA to assemble the taxpayer’s case. That is a dangerous strategy.
Oral Hearing Strategy Starts in the Brief
OTA may decide a case on the written record or after an oral hearing. If the taxpayer does not request an oral hearing or waives it by failing to respond properly, the appeal is submitted for an opinion based on the written record. OTA also requires a timely response to a notice of oral hearing, and failure to respond can remove the appeal from the oral hearing calendar and send the case for decision on the written record.
An oral hearing is not a substitute for a weak brief. It is an opportunity to clarify the record, answer panel questions, present witness testimony where appropriate, introduce properly prepared exhibits, and respond to the agency’s theory. Each party has the right at an oral hearing to call and question witnesses, introduce exhibits, and respond to evidence, and testimony is given under oath or affirmation. But the brief should already tell the panel what the hearing will prove and why the testimony matters.
Taxpayers also need to understand public-record implications. OTA publishes an opinion for each appeal decided by a panel, and opinions generally include the issues, law, analysis, and holding. Nonprecedential opinions are not precedential in other OTA appeals unless OTA designates them as precedential, and precedential opinions receive a “P” designation. OTA may seal records or redact information in appropriate circumstances, but its rules apply those protections narrowly and recognize the public interest in transparency.
That publication framework matters in high-risk cases. A taxpayer fighting an assessment may also be protecting reputation, licensing, immigration posture, investor confidence, or future audit exposure. Where the record contains sensitive business data, personal financial facts, trade secrets, or potentially incriminating explanations, counsel should evaluate confidentiality, privilege, redaction, and hearing strategy before the filing creates preventable collateral damage.
Contact the Tax Law Offices of David W. Klasing if You Need an OTA Brief
If you are appealing an FTB or CDTFA determination to the Office of Tax Appeals, you should treat the brief as the foundation of the case, not as a formality. At the Tax Law Offices of David W. Klasing, our dual-licensed Attorneys and CPAs help taxpayers identify the issues OTA can actually decide, reconstruct the factual record, organize the evidence, and develop a persuasive legal theory before the government’s version of the facts becomes the only coherent narrative. Our goal is damage control: narrow the dispute, preserve credibility, and build a record that gives the OTA panel a legally and factually supported basis to rule in your favor.
At the Tax Law Offices of David W. Klasing, we offer the strategic advantage of integrated legal and tax analysis within a coordinated defense team. Our dual-licensed Civil & Criminal Tax Attorneys & CPAs bring both advocacy and accounting depth to California tax appeals involving residency, income sourcing, entity classification, sales and use tax, penalties, refund claims, and high-risk audit findings. When a case presents potential criminal tax exposure, our CPAs work under attorney supervision as part of the legal team so factual reconstruction, exhibit preparation, penalty analysis, and appeal strategy can be developed with attorney-client privilege and attorney work-product protections in mind.
An OTA appeal can affect far more than the tax balance listed on a notice. A weak brief can preserve the wrong facts, waive the best arguments, expose sensitive information, and create admissions that follow the taxpayer into collections, later audits, refund litigation, or criminal tax enforcement. If you know or suspect that your California tax appeal requires more than a basic disagreement letter, call the Tax Law Offices of David W. Klasing at 800-681-1295 or contact us online HERE for a confidential, reduced-rate initial consultation.
