AI Hallucinations, IRS Audits & Why Bookkeeping Matters: Lessons from a Tax Court Case

In this episode of the Tax Smart REI Podcast, Thomas Castelli and Nate Sosa share podcast updates, celebrate reaching the top 1% globally, and break down a recent Tax Court case that highlights critical mistakes taxpayers can make. The case serves as a cautionary tale involving underreported income, poor recordkeeping, self-prepared tax returns, and even AI-generated fake legal citations used in court.

For real estate investors and business owners, it underscores the importance of accurate bookkeeping, proper documentation, and working with qualified tax professionals.

Podcast Updates & A Major Milestone

Thomas opens the episode by announcing that the Tax Smart REI Podcast has officially reached the top 1% of podcasts globally, averaging 36,715 downloads per month (excluding YouTube and Spotify). For context, the top 5% of podcasts average around 4,000 monthly downloads, while the top 1% averages approximately 35,000. He thanks listeners for subscribing, leaving reviews, and sharing the show. The team also announces new initiatives, including monthly live Q&A sessions and additional educational segments covering tax updates and deadlines. Thomas also shares that he will be co-hosting the Major League Real Estate Podcast alongside Nate Sosa.

Why Tax Preparation Isn’t a Commodity

A major theme of the episode is the misconception that all tax preparation is the same. Many taxpayers assume filing taxes is simply completing forms, but this mindset often leads to costly mistakes—especially for real estate investors. Common issues seen from general CPAs include incorrectly electing out of bonus depreciation, misreporting 1031 exchanges, improperly classifying short-term rentals, and using the wrong schedules (such as Schedule C instead of Schedule E). These errors can result in significant lost tax savings or unnecessary tax liability. For investors using advanced strategies like cost segregation or the short-term rental loophole, working with a specialized tax professional is critical.

The Tax Court Case: Clinkscales v. Commissioner

The case discussed involves an attorney and business owner who was audited after filing self-prepared tax returns from 2015 through 2019. The taxpayer owned a restaurant, a law practice, and two rental properties. The audit was triggered in part by late filings, which increased IRS scrutiny. During the audit, the IRS requested bank statements and identified a major discrepancy between reported income and actual deposits.

How the IRS Reconstructed Income

The taxpayer claimed that 90% of restaurant revenue came from credit card transactions and only 10% from cash. However, when the IRS reviewed bank records, they discovered $2.29 million in gross receipts compared to only $1.6 million reported. This revealed hundreds of thousands of dollars in unreported income. The IRS used the bank deposits method to reconstruct income, relying on bank records, 1099 forms, and cash activity. As a result, what the taxpayer originally reported as a loss was converted into taxable income.

The AI Hallucination Problem in Court

One of the most striking aspects of the case was the taxpayer’s legal defense. The taxpayer cited multiple Tax Court cases to challenge the IRS, but several of those cases did not exist. The court determined that the taxpayer likely relied on AI-generated research that hallucinated fake legal citations. This severely damaged the taxpayer’s credibility. Thomas notes that this is a growing risk when using AI tools for technical tax or legal research without verification. He shares that he has personally seen AI generate fake Tax Court cases and nonexistent IRS guidance, reinforcing the importance of verifying all information before relying on it.

The Importance of Documentation

Another major issue involved depreciation deductions. The taxpayer claimed approximately $57,000 in depreciation for rental properties but failed to provide supporting documentation such as closing statements, purchase records, or invoices. As a result, the IRS disallowed the deductions entirely. In Tax Court, the burden of proof is on the taxpayer. If you cannot substantiate a deduction, it will be denied.

Why Bookkeeping Is Critical

This case highlights one of the most overlooked aspects of running a real estate business: bookkeeping. Many investors avoid it because it feels like an unnecessary expense, but poor recordkeeping creates serious risks. Without proper bookkeeping, you cannot accurately track income, substantiate deductions, defend yourself in an audit, or make informed financial decisions. In many cases, the IRS focuses heavily on bookkeeping during audits because it often reveals larger tax issues. Professional bookkeeping also helps investors track profitability, manage cash flow, and improve overall decision-making.

Final Takeaways

The lessons from this case are clear. First, the IRS has access to more data than many taxpayers realize, including forms like 1099-K and 1099-MISC, which make discrepancies easier to identify. Second, documentation is essential—without it, deductions can be disallowed regardless of legitimacy. Third, AI is not a replacement for tax professionals. While it can assist with research, it must be verified, especially in technical areas like tax law.

If you’re navigating complex tax situations or want to avoid the mistakes highlighted in this case, working with a real estate-focused CPA can help ensure compliance and maximize your tax strategy.

Disclaimer: This podcast summary was generated from the transcript and may contain some errors or miss key points from the audio recording.