Article Highlights:

• The Lesson: Deductions Require Proof
• Travel Expenses Are Especially Vulnerable
• Vehicle Deductions Also Demand Strict Records
• Credit Card Statements Are Not Enough
• Why The Home Office Deduction Survived
• Penalties Made The Mistake More Expensive
• Practical Recordkeeping Tips For Self-Employed Taxpayers
• Final Takeaway

Self-employed taxpayers often know that business expenses can reduce taxable income, but many learn too late that a deduction is only as good as the records behind it. A recent Tax Court decision involving a real estate agent is a sharp reminder that having a business purpose is not enough. If you cannot substantiate the expense, the IRS and the courts may (and usually will) disallow it.

In the case, the taxpayer was a licensed real estate agent who worked for two companies while also running an independent real estate business. On his return, he claimed substantial Schedule C deductions for travel, meals, car and truck expenses, and office expenses. But when the case reached Tax Court, nearly all of the travel and vehicle deductions were denied because the records were incomplete or not kept in the way the law requires.

The court did allow a home office deduction, but only after applying the “Cohan rule” and accepting limited supporting evidence. Even then, the taxpayer still faced a 20% accuracy-related penalty of $2,192 on the resulting tax liability of $10,960, bringing the total due to $13,152, plus interest, when the tax notice was issued.

For self-employed individuals, especially those who travel for work, this case is a cautionary tale. Good recordkeeping is not optional. It is the foundation of every deduction you claim.

The Lesson: Deductions Require Proof

A common misconception among business owners is that if an expense was truly business-related, the deduction should be safe. Unfortunately, tax law does not work that way for many expenses.

Some deductions, especially travel, meals, and vehicle expenses, are subject to strict substantiation rules. That means the taxpayer must have records showing not just that the expense happened, but also:

• the amount,
  
  
• the time and date,
  
  
• the place or location, and
  
  
• the business purpose.

For certain expenses, the taxpayer also needs to show the business relationship involved. In other words, it is not enough to say, “I traveled for work.” The IRS wants to know where you went, when you went, why you went, who you met with, and what business was conducted.

In the real estate agent’s case, the taxpayer produced credit card statements, flight receipts, a mileage log that was not prepared contemporaneously, and biographies for two passengers he identified as clients. The Tax Court acknowledged that he did incur some business-related costs. But that was not enough. He failed to prove which expenses were actually incurred in the pursuit of business and which might have been personal, mixed-use, or otherwise unverified.

As a result, the court allowed only a small portion of the claimed travel and meal expenses—$711.60—and disallowed the rest.

Travel Expenses Are Especially Vulnerable

Travel deductions are one of the easiest areas where taxpayers get into trouble. Why? Because travel often includes a mix of business and personal elements. A flight, hotel stay, rideshare, or meal may be partly related to business, but if the business purpose is not documented, the deduction can be lost.

The IRS and Tax Court typically expect contemporaneous records. That means records made at or near the time the expense was incurred, not reconstructed later from memory. A spreadsheet prepared after an audit begins is much less persuasive than a log kept during the year.

For travel, taxpayers should keep:

• airline tickets and boarding passes,
  
  
• hotel folios,
  
  
• conference agendas,
  
  
• meeting notes,
  
  
• calendar entries,
  
  
• receipts for meals and transportation,
  
  
• names and business relationships of people met, and
  
  
• a written explanation of the business purpose.

If you travel to a conference, you should be able to show the schedule, the sessions attended, and the business reason for the trip. If you travel to meet a client, you should note the client’s name, the date, the location, and the topic discussed.

The real estate agent’s case shows how quickly travel deductions can unravel when records are pieced together after the fact. Even when the taxpayer had some supporting documents, the court still found the evidence insufficient to tie many of the expenses to business activity.

In this era of computers and cellphones, reverting to old-fashioned paper copies to support the types of expenses mentioned in this article may be appropriate as a back-up, just in case the computer fails or the cellphone is lost.

Vehicle Deductions Also Demand Strict Records

Vehicle expenses are another common problem area for self-employed taxpayers. Whether you deduct actual expenses or use the standard mileage rate, you need reliable documentation.

In the case, the taxpayer claimed car and truck expenses, but the Tax Court disallowed them because he did not have adequate substantiation. His mileage log was not contemporaneous, and he did not provide odometer readings or other corroborating evidence of business use.

That matters because a mileage log is not just a nice extra. For many vehicle deductions, it is the backbone of the claim. A proper mileage log should include:

• the date of each trip,
  
  
• the beginning and ending odometer readings,
  
  
• total miles driven,
  
  
• destination,
  
  
• business purpose, and
  
  
• the names of any clients or contacts involved.

A calendar, appointment book, mapping app history, or phone records may help support a log, but they usually should not be the only evidence. If you use your vehicle for both business and personal driving, the IRS expects you to separate the two carefully.

This is particularly important for self-employed people whose work involves local driving, errands, site visits, and client meetings. A few missing entries can be enough to put the entire deduction at risk.

Credit Card Statements Are Not Enough

Many taxpayers assume that if they have a receipt or credit card statement, they are protected. The real estate agent case proves otherwise.

A credit card statement can show that you spent money, but it rarely shows why you spent it. It may reveal the amount and the vendor, but not the business purpose. For example, a restaurant charge may show a meal occurred, but it does not prove who attended or whether the meal was related to business. A gas station charge may show fuel was purchased, but it does not show whether the mileage was for work or personal use.

That is why receipts and statements should be paired with notes, logs, and calendars. The more time passes, the harder it becomes to reconstruct the facts. A short note entered the same day can save a deduction months or years later.

A good rule: if a stranger reviewed your records, would they understand why the expense was business-related? If not, your documentation may not be strong enough.

Why The Home Office Deduction Survived

Interestingly, the Tax Court did allow a home office deduction, even though it rejected most of the travel and vehicle claims. The reason is important.

Travel and vehicle expenses are subject to strict substantiation rules under Internal Revenue Code Section 274(d). Home office expenses are not subject to those same rules, so the court could estimate the deduction under the Cohan rule based on the evidence presented.

The Cohan rule stems from a ruling by the U.S. Second Circuit Court of Appeals in the nearly 100-year-old Cohan v. Commissioner case It allows business expenses to be estimated when a taxpayer cannot produce exact records, but the estimates must be reasonable and supported by some factual evidence. (George M Cohan was a famous entertainer of the time who wasn’t able to produce exact records during an IRS audit.)

This rule is particularly relevant during IRS audits, where taxpayers may need to justify deductions without complete documentation.

The taxpayer in the recent case testified credibly that he operated his real estate business exclusively from a 130-square-foot room in his apartment. He also provided a log, credit card statements, a floor plan, and a receipt for rental payments. That evidence was enough for the court to allow a home office deduction in an amount to be determined later.

But this should not be misunderstood as a reason to relax recordkeeping. The home office deduction survived because the taxpayer had enough evidence to convince the court. Other taxpayers may not be so fortunate. And even when a deduction is allowed under Cohan, the taxpayer may still lose a large portion of the amount claimed.

Penalties Made The Mistake More Expensive

The cost of poor recordkeeping did not stop with the denial of deductions. The IRS also imposed a 20% accuracy-related penalty under Section 6662(a), and the Tax Court upheld it.

The resulting tax liability was $10,960. The penalty added another $2,192, bringing the total to $13,152, before interest. Once interest is included, the cost rises further.

That is an important point for self-employed taxpayers: when deductions are disallowed, the financial damage can be much larger than the lost deduction itself. A taxpayer may have to pay the extra tax, a penalty, and interest, all because the records were not strong enough to support the return.

The taxpayer argued that he could not produce additional records because of a fiduciary duty to his clients. The court did not accept that argument. It also noted that although he hired a preparer, he did not provide the preparer with all of the necessary information. The court found that, as a sophisticated real estate professional, he should have understood his recordkeeping obligations.

Beside the 20% accuracy penalty, taxpayers with undocumented expenses may incur daily compounding interest, up to 47.5% in combined late filing/payment penalties, a 75% civil fraud penalty if the undocumented items are deemed intentional evasion, and potential criminal prosecution.

Practical Recordkeeping Tips For Self-Employed Taxpayers

If you are self-employed, here are some practical steps to protect your deductions.

1. Record expenses as they happen - Do not wait until tax season. Use an app, spreadsheet, or notebook to log expenses immediately.

2. Keep business purpose notes - For each expense, note who, what, where, when, and why. A receipt without a purpose is incomplete.

3. Separate business and personal use - Use separate bank and credit card accounts for business when possible. This makes recordkeeping much easier.

4. Maintain a mileage log - If you drive for business, keep a contemporaneous log. Include destinations, business purpose, and miles.

5. Save supporting documents - Keep receipts, invoices, contracts, calendars, emails, conference materials, and meeting notes.

6. Back up electronic records - Store digital copies in more than one place. Phones are lost, computers fail, and paper can disappear.

Final Takeaway

The real estate agent’s Tax Court case is a powerful reminder that tax deductions are not awarded based on trust alone. They must be substantiated. For self-employed individuals, especially those with frequent travel and vehicle use, recordkeeping is not a back-office task—it is part of doing business.

The message for every self-employed taxpayer is simple: if you want the deduction, keep the proof. Save the receipt, log the mileage, document the meeting, and record the business purpose while the details are fresh. Good records are the best defense against a costly audit dispute.

If you have questions or need help establishing a recordkeeping system tailored around your specific self-employment, contact this office.