IRS Rules Explained: When Pets, Beer, and Even Body Oil Can Be Legal Tax Write-Offs

When most people think about tax deductions, they picture things like mortgage interest or charitable donations. They don’t think of pet food, beer, or body oil. But believe it or not, the IRS tax code allows some surprisingly unusual write-offs under very specific circumstances. Over the years, tax courts have approved some truly eye-opening deductions that sound more like jokes than legitimate financial strategies. Here are seven deductions that you may find interesting (and you should totally be claiming).

1. Pets Can Be Deductible

You can’t claim your family dog as a dependent, no matter how much you love them. However, pets can qualify as IRS tax write-offs if they serve a legitimate business purpose. For example, guard dogs used to protect business property or cats used to control pests may have deductible expenses like food and veterinary care.

In one famous case, a junkyard owner successfully deducted cat food because the animals helped keep rats and snakes away. But the rule is that the animal must contribute to income or business operations; it may qualify. Without that connection, your furry friend remains a personal expense.

2. “Free Beer” Can Count as a Marketing Expense

Giving away beer might sound like a party (not a tax strategy), but it can qualify as a business deduction. In one case, a gas station owner deducted the cost of beer given to customers as a promotional expense. The idea was that free drinks attracted more customers and boosted sales, making it a legitimate business cost.

The IRS allows deductions for marketing and advertising expenses, even if they seem unconventional. The key is proving the expense directly supports your business income. So while you can’t deduct your weekend drinks, a business promotion might be a different story.

3. Body Oil Can Be a Legitimate Business Expense

Body oil isn’t something most people would ever think to deduct, but for certain professionals, it qualifies. A competitive bodybuilder successfully argued that body oil used during competitions was necessary for their profession. The tax court agreed, allowing it as a business expense tied to income generation.

This falls under the IRS rule that expenses must be “ordinary and necessary” for your specific line of work. While body oil won’t qualify for everyday taxpayers, it shows how flexible the rules can be. Context is everything when it comes to IRS tax write-offs.

4. Medical Expenses Can Include Unusual Treatments

Some of the most surprising IRS tax write-offs fall under medical expenses. For example, a swimming pool was partially deductible when prescribed by a doctor for treating a serious condition. In another case, clarinet lessons were allowed as a deduction because they helped correct a child’s overbite.

The IRS allows medical deductions if they are necessary to treat or manage a diagnosed condition. Documentation from a healthcare provider is essential to support these claims. These examples show that medical deductions can go far beyond standard doctor visits.

5. Cosmetic Expenses Can Qualify

Cosmetic procedures are usually not deductible, but there are exceptions. If a procedure is directly tied to a business or required to treat a medical condition, it may qualify. For instance, a performer successfully deducted cosmetic surgery because it was considered essential to earning income.

Similarly, reconstructive procedures related to injuries or medical conditions can be deductible. The IRS evaluates whether the expense is necessary rather than purely cosmetic. This is one of the more complex areas of IRS tax write-offs, so professional advice is often needed.

6. Travel Can Be Deductible

Travel expenses can also lead to unexpected IRS tax write-offs. Business-related trips, including conferences or meetings, are often deductible, even if they take place in appealing destinations. In some cases, trips to locations like Bermuda have qualified if they meet IRS criteria for business purposes.

The key requirement is that the primary purpose of the trip must be business-related. Personal vacations, even partially, are not deductible unless clearly separated from business activities. Proper documentation is critical to avoid IRS scrutiny. When done correctly, travel deductions can offer significant savings.

7. Home Improvements Can Become Business Deductions

Home-related expenses can also qualify under certain conditions. If you operate a business from home, improvements like landscaping or renovations may be partially deductible. The IRS requires that the space be used exclusively for business to qualify.

This means a home office must meet strict criteria to be eligible. Even then, only the portion related to business use can be deducted. While it’s not as unusual as beer or body oil, it’s still a commonly misunderstood deduction. Knowing the rules can help you maximize legitimate IRS tax write-offs.

Why “Ordinary and Necessary” Is the Key Rule

All of these unusual deductions have one thing in common: they meet the IRS standard of being “ordinary and necessary.” This means the expense must be typical for your industry and helpful for earning income. Even the strangest IRS tax write-offs are approved because they meet this core requirement. Courts often play a role in determining whether an expense qualifies. Without this connection, even reasonable expenses can be denied.

At the end of the day, the goal isn’t to find the weirdest deduction. It’s to find the ones that legitimately apply to you. Whether it’s a home office, business expense, or medical cost, the key is proper documentation and clear justification. When you approach your taxes strategically, you’re more likely to save money without taking unnecessary risks. IRS tax write-offs can be powerful, but only when used correctly.

Have you ever claimed a surprising tax deduction or heard of one that made you do a double-take?

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Drew Blankenship

Drew Blankenship is a seasoned automotive professional with over 20 years of hands-on experience as a Porsche technician.  While Drew mostly writes about automotives, he also channels his knowledge into writing about money, technology and relationships. Based in North Carolina, Drew still fuels his passion for motorsport by following Formula 1 and spending weekends under the hood when he can. He lives with his wife and two children, who occasionally remind him to take a break from rebuilding engines.