The California OTA Decision at a Glance

In Appeal of G. Barraza, OTA Case No. 231214989, issued April 25, 2025, the taxpayer operated an online sales business through eBay. PayPal issued a Form 1099-K reporting approximately $100,638 in merchant income for the 2018 tax year. That amount was not reported on the taxpayer’s original federal or California income tax returns.

The IRS later increased the taxpayer’s federal adjusted gross income to account for the unreported payment-platform income. After learning of the federal adjustment, the California Franchise Tax Board made corresponding adjustments to the taxpayer’s California income and issued a Notice of Proposed Assessment for $8,120 in additional tax, plus interest.

The taxpayer argued that the reported payment-platform income overstated actual profit because the business had expenses. The claimed expenses included phone charges, eBay and PayPal fees, refunds, supplier payments, and cost of goods sold. According to the taxpayer, those expenses reduced the business’s profit dramatically.

OTA did not reject every argument. It allowed a deduction of $4,002.77 for documented eBay fees. However, it denied most of the claimed offsets because the taxpayer did not provide sufficient credible evidence tying the claimed expenses to the reported income. The assessment was therefore modified slightly but otherwise sustained.

That distinction matters. The taxpayer did not lose because business expenses are impossible to deduct. The taxpayer lost because the evidence did not reliably prove that the claimed expenses were actually incurred, paid, and connected to the specific income at issue.

Why California OTA Upheld the Tax Assessment

A Federal Adjustment Creates a Serious Starting Point

California taxpayers often assume that a federal tax problem and a California tax problem are separate adventures. In reality, they can become a two-for-one special nobody requested.

When the IRS changes a taxpayer’s federal income, the FTB may make corresponding California adjustments where California law applies. Under California tax procedure, an assessment based on a final federal determination is generally presumed correct. The taxpayer then bears the burden of showing that the state assessment is wrong.

This does not mean the FTB is always right. It means the taxpayer must bring proof, not just a persuasive story. At OTA, the usual standard is a preponderance of the evidence. In plain English, the taxpayer must show that their version is more likely true than not true.

A statement such as “I had lots of expenses” may be factually true, emotionally understandable, and financially painful. But without records, it often does not move the needle. Tax appeals are less like a courtroom monologue and more like assembling furniture: the instructions are tedious, the tiny pieces matter, and skipping a screw can make the whole thing wobble.

Unsupported Assertions Do Not Defeat an Assessment

OTA repeatedly emphasizes that unsupported assertions are not enough to overcome a proposed assessment. The agency looks for credible, competent, and relevant evidence. That can include invoices, bank records, payment processor statements, merchant account reports, inventory records, order confirmations, bookkeeping ledgers, contracts, canceled checks, and other documents created during the ordinary course of business.

In the Barraza case, the taxpayer submitted spreadsheets, redacted financial statements, selected emails, a limited number of invoices, and other documents. The problem was not simply quantity. The problem was connection. OTA could not consistently connect the claimed expenses to the underlying transactions reported on the 1099-K.

A spreadsheet can be useful as a roadmap. It can organize hundreds of transactions and help explain a business model. But it is usually not the destination. A spreadsheet created after an audit begins may summarize events, yet it does not automatically prove that the summarized events happened exactly as described.

What Went Wrong With the Claimed Business Expenses

Phone Expenses Need a Business-Use Foundation

The taxpayer claimed a deduction for cellular phone expenses. OTA found that the evidence did not establish how much of the phone use was business-related rather than personal. A single billing entry did not prove that all claimed charges were paid or that the phone was used primarily for the online sales business.

This is a familiar issue for self-employed taxpayers. A phone is often both a business tool and a personal lifeline. The tax question is not whether the phone existed. The question is whether the claimed business portion can be reasonably supported.

Platform Fee Schedules Are Not Proof of Fees Paid

The taxpayer also claimed fees paid to PayPal, eBay, and another marketplace. OTA accepted the eBay fee deduction only because eBay invoices documented actual charges totaling $4,002.77. In contrast, a general PayPal fee schedule did not establish the fees the taxpayer actually paid.

That difference is important for online businesses. A website’s published fee schedule explains what a company could charge. It does not necessarily prove what it did charge on a particular account, during a specific tax year, for specific transactions.

For tax purposes, platform account statements, merchant settlement reports, monthly invoices, and transaction-level fee reports are much stronger than generic screenshots of pricing pages.

Refunds and Cost of Goods Sold Must Be Traceable

The taxpayer claimed substantial customer refunds and cost of goods sold. OTA found the evidence insufficient because the records did not reliably establish that the refunds had not already been reflected in the payment-platform reporting, or that the claimed inventory costs related to sales included in the 1099-K amount.

For a merchandising business, cost of goods sold can be one of the largest deductions available. Yet it is not a magic number that can be entered after the fact. A taxpayer should be able to show what was purchased, when it was purchased, what it cost, what was sold, and how those goods connect to the reporting period.

OTA also declined to estimate additional deductions under the well-known Cohan rule. That rule can permit reasonable estimates in limited situations, but only when there is enough reliable evidence to establish that an expense was actually incurred. It is not an invitation for a tax tribunal to conduct a guessing contest with the lights off.

What the Case Means for Online Sellers and Small Businesses

The Barraza decision is not precedential, meaning it does not carry the same binding authority as an OTA precedential opinion. Still, it is a highly practical illustration of how OTA evaluates proof in California tax assessment disputes.

The broader lesson is simple: payment-platform reporting is generally a starting point, not a complete profit-and-loss statement. A Form 1099-K can reflect gross payment activity, while a business’s taxable income may be reduced by refunds, fees, inventory costs, shipping, advertising, contractor payments, and other legitimate expenses.

However, the burden remains on the taxpayer to establish those deductions. Tax authorities do not automatically reconstruct the best possible version of a taxpayer’s bookkeeping system. They examine the record presented to them.

For marketplace sellers, this means preserving more than annual summaries. Keep downloadable transaction histories, sales reports, return reports, shipping records, supplier invoices, inventory purchase confirmations, merchant fee statements, bank statements, and proof of payment. Ideally, reconcile them monthly rather than attempting archaeological excavation after an audit notice arrives.

How the California FTB Assessment and Appeal Process Works

A California tax dispute often begins with an audit, a federal adjustment, or third-party information reporting. If the FTB believes additional tax is due, it may issue a Notice of Proposed Assessment. The notice explains the proposed additional tax, penalties, and interest.

Taxpayers generally have a limited period to protest the proposed assessment. A timely protest should clearly identify the tax years involved, explain the factual disagreement, state the legal position, and attach supporting documentation. Missing the deadline can allow the proposed assessment to become final, which is the bureaucratic equivalent of letting the oven timer beep while pretending you did not hear it.

If the FTB issues a Notice of Action after the protest stage and the taxpayer still disagrees, the taxpayer may appeal to the California Office of Tax Appeals. The appeal should include the notice being challenged and the evidence needed to support the taxpayer’s position. Documents submitted to the FTB should also be submitted to OTA; taxpayers should not assume every document will magically teleport from one file to another.

Interest can continue to accrue while a dispute is pending. Depending on the circumstances, a taxpayer may consider making a properly designated tax deposit while contesting the assessment. This can help limit interest exposure without necessarily giving up the right to protest or appeal.

California also has special reporting rules for federal changes. When the IRS makes a final adjustment, taxpayers generally must notify the FTB within six months. Failure to report a federal change can create significant timing and assessment issues, including an extended period for the FTB to assess additional tax.

A Better Evidence Strategy for a California Tax Appeal

A strong tax appeal starts long before the opening brief. It starts with records that tell a coherent story. The goal is not to overwhelm the agency with a thousand random pages. The goal is to make each disputed dollar traceable.

Build a Transaction Bridge

For an online sales business, create a reconciliation that begins with the 1099-K amount and then identifies the related marketplace sales, refunds, chargebacks, merchant fees, shipping charges, and inventory costs. Every line should point to source documents.

For example, a taxpayer might reconcile a payment-platform total to monthly settlement reports, then connect each refund to a transaction ID, each fee to a platform invoice, and each inventory purchase to a supplier invoice and bank payment. A clean reconciliation does not guarantee victory, but it gives OTA something much more valuable than a vague explanation: a verifiable path.

Use Contemporaneous Records Whenever Possible

Records created at the time of the transaction generally carry more weight than a reconstruction assembled years later. A supplier invoice, a merchant statement, and a bank confirmation are usually stronger than an undated spreadsheet typed after receiving an audit notice.

That does not mean reconstructed records are useless. They can be helpful when original documents are missing. But they should be supported by underlying evidence wherever possible. A reconstruction with receipts, statements, emails, and transaction IDs has a fighting chance. A reconstruction that says “trust me, it happened” is much weaker.

Address the Federal Adjustment Directly

When a California assessment is based on an IRS adjustment, do not merely argue that the state number feels wrong. Identify exactly where the federal adjustment is incorrect, whether it remains final, and how the California calculation should change under California law.

That may require IRS account transcripts, federal audit reports, amended returns, settlement documents, Tax Court filings, or other records showing the final federal position. California may not blindly follow every federal result, but a taxpayer seeking relief must give OTA a legally and factually supported reason to depart from the assessment.

Practical Experience: What These California Tax Assessment Disputes Feel Like in Real Life

In practical terms, a California tax assessment dispute often begins with panic, followed by a very determined search through old email folders. The taxpayer remembers buying inventory, issuing refunds, paying platform fees, and working late at night on a phone that was definitely business-related at least some of the time. The trouble is that tax controversy work does not run on memory. It runs on evidence.

Consider a typical online seller who receives a 1099-K. The seller sees a large gross amount and immediately thinks, “That cannot possibly be my profit.” Often, that instinct is correct. Gross payment activity can include the price of goods, sales that were later refunded, marketplace fees, shipping reimbursements, and other amounts that do not equal net taxable income. But the next question is unavoidable: can the seller prove the correct net amount?

The most successful taxpayers usually approach the problem like a forensic bookkeeping project. They download payment-platform data before it disappears from the account portal. They save annual seller statements, monthly marketplace invoices, customer refund reports, supplier receipts, shipping records, and bank statements. They use transaction IDs consistently. They do not wait until three years later, when the only surviving evidence is a blurry screenshot named “IMG_1847_final_final2.”

Another common experience involves mixed-use expenses. A phone, car, home internet connection, or laptop may genuinely support a business. But a taxpayer who uses the same item personally must develop a reasonable method for separating business use from personal use. The method does not have to be perfect. It does have to be sensible, documented, and consistent with the facts.

Taxpayers also learn that an appeal is not always about proving the government wrong in every respect. Sometimes the best result is narrower. In the Barraza decision, the taxpayer did receive a reduction for eBay fees because those fees were documented. That is a useful reminder that every supported adjustment matters. A partial win can reduce tax, interest, and penalties even when the overall assessment remains largely intact.

Finally, taxpayers who fare better in OTA proceedings tend to understand that credibility is cumulative. One invoice may prove one purchase. A bank statement may prove one payment. A marketplace report may prove one set of fees. When those records line up, they form a persuasive business narrative. When they conflict, omit key periods, or cannot be tied to the reported income, the taxpayer’s case becomes much harder to sustain.

The best practical takeaway is not glamorous: preserve records as you go. Good bookkeeping is less exciting than a viral sales weekend, but it is far more useful when California comes knocking. In a tax appeal, the hero is rarely the dramatic argument. More often, it is the boring, beautifully organized folder labeled “2018 eBay Fees, Refunds, and Supplier Invoices.”

Conclusion

The California OTA decision in Appeal of G. Barraza shows how quickly a tax dispute can turn on documentation. The taxpayer successfully proved a limited amount of eBay fees, but could not substantiate larger claimed deductions for other fees, refunds, phone expenses, and cost of goods sold. As a result, OTA largely upheld the FTB’s assessment.

For taxpayers facing a California tax assessment, the lesson is clear: respond on time, understand whether a federal adjustment triggered the issue, and build a record that connects every claimed deduction to reliable evidence. In California tax appeals, facts matter. Documents matter more.