Seven tax deductions that can lead to an audit: how to avoid problems

According to the Internal Revenue Service (IRS), only 0,36% of individual tax returns were audited in 2023, or less than 4 out of every 1000. However, there are a few write-offs that the IRS pays special attention to. This article explains them: aol.

These deductions receive disproportionate attention not because they are inherently suspect, but because taxpayers often misuse them or misreport them.

Below is a more detailed look at seven of the most commonly asked about deductions, along with tips on how to make them work for you, not against you.

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1. Business losses

It's normal for a business to occasionally lose profit. But if you report losses year after year, the IRS may question whether you're running a real business or simply using a hobby to reduce other income.

The IRS applies a "safe harbor" rule: if an activity is profitable for at least three out of five consecutive years, it is generally considered a legitimate business. If this threshold is not met, you must prove that you genuinely intend to make money.

Auditors look for basic indicators of genuine business activity: separate bank accounts, invoices, advertising materials, a documented business plan, or any other evidence of profit-making intent. If a business has convincing documentation, the deduction is usually straightforward. If it doesn't, the IRS is likely to challenge the claimed losses.

If your business is real, this deduction is worth taking advantage of. Just be prepared to demonstrate how it operates day-to-day.

2. Home office tax deduction

Few deductions cause as much confusion as the home office deduction. However, it's simpler than it seems, and claiming it on its own doesn't trigger an audit. The IRS requires that the space be used exclusively and regularly for business purposes. A laptop in the living room or a guest room that occasionally serves as an office are not eligible.

Most often, problems arise when deductions are claimed for multifunctional spaces or when the area is indicated without confirmation. If you use the simplified method - $5 per square foot (0,9 m²), but not more than 300 square feet (27,9 m²) — and retain basic evidence (such as photographs, a floor plan, and utility bills), then proving the deduction's validity is usually easy.

For the self-employed, this deduction can significantly reduce taxable income. However, employees with W-2 forms cannot claim it: the "Big Beautiful Act," passed this year, made the previously temporary suspension permanent. (Employees with W-2 forms are regular employees, officially employed by a company or organization. The employer withholds taxes from their wages, including income tax, Social Security, and Medicare, and provides them with a W-2 form at the beginning of the year, which lists the total amount of income and taxes withheld. The employee uses this form to file a tax return. Unlike independent contractors, who receive a 1099 form, these employees have social security benefits, and the employer is responsible for taxes and certain benefits for them. - Note)

If your home office does qualify, this deduction remains one of the most beneficial.

3. Charitable donations without supporting documents

Charitable contributions are a standard deduction, but unusually large amounts relative to income may raise questions, especially if the donations were made in cash. The IRS compares the amounts reported with the average for your income level. A significant excess increases the likelihood of additional audits.

For any one-time donation of $250 or more, written confirmation from the charity is required. For smaller amounts, bank records, receipts, or canceled checks are required. For in-kind donations of $500 or more, Form 8283k must be attached to your tax return.

Many deductions are rejected not because they are incorrect, but because taxpayers cannot prove them.

It's worth claiming a charitable deduction if you have the proper documentation. Sometimes, if questions arise, a photo of the receipt or a saved electronic confirmation will suffice.

4. Medical expenses

Medical expenses can only be deducted to the extent that they exceed 7,5% of adjusted gross income—a threshold Congress made permanent in 2021. This means that if your income is $80,000, the first $6000 of medical expenses are tax-deductible. (So, if your income is $80,000, only medical expenses exceeding 7,5% of that income are deductible for tax purposes. 7,5% of $80,000 = $6000.)

This means the first $6000 of medical expenses don't deduct tax, and only expenses over $6000 can provide a tax benefit. For example, if you spent $8000 on medical services, only $2000 ($8000 - $6000) can be deducted for tax purposes. approx.)

Most taxpayers don't reach this threshold, but when they do, the amounts involved can be significant and could attract the attention of the Tax Service.

Allowable expenses include surgeries, prescription drugs, dental work, hospital bills, medical equipment, Medicare premiums, and even travel expenses. Unallowable expenses—cosmetic procedures not deemed medically necessary, over-the-counter supplements, and gym memberships—are what most often raise questions.

Documentation is critical. Keep itemized receipts, insurance payout statements, and medical bills for at least three years after filing.

For families with major surgeries or chronic illnesses, the tax savings can be significant and justify the extra consideration.

5. Expenses of the self-employed

If you're self-employed, you can deduct expenses for travel, supplies, software, and equipment used in your business. However, Schedule C returns are audited more frequently than usual, especially if the expenses appear excessive compared to your income or could be mistaken for personal expenses.

One of the most frequently contested deductions is mileage. At a rate of $0,70 per mile (1,6 km) in 2025, this deduction is very advantageous—but only if you have logs showing the date, destination, business purpose, and mileage for each trip. Estimates based on "eyeballing" are usually reduced or rejected. Travel, meals, and purchases of household appliances also raise questions unless their connection to business can be clearly demonstrated.

The easiest way to protect this deduction is to record the data immediately. If the records clearly show when the trip took place, what the expenses were, and how the mileage was calculated, the IRS will generally accept the deduction, and the savings can be significant.

6. Deductions for rental property

If you own a rental property, you can deduct interest on the mortgage, repairs, depreciation, and maintenance. But when you use the property personally, the situation becomes more complicated. If personal use exceeds 14 days or 10% of the rental term, all expenses must be apportioned between rental and personal use.

The IRS requires clear records of how many days a property was rented out and how many were used for personal purposes. Attempting to write off a $25,000 roof replacement as a repair rather than an improvement could lead to an audit. The IRS compares repair costs in Schedule E with similar properties, and unusually large amounts raise serious suspicions.

If you rent out a vacation home for 60 days and live in it for 30 days during the summer, you can only deduct two-thirds of the expenses.

Conclusion: treat real estate like a business. Maintain a booking calendar, save contractor invoices, and document every stay. With proper documentation, problems usually don't arise. However, attempting to write off 100% of the expenses for a property with active personal use will certainly attract attention.

7. Deductions for vehicles with questionable mileage

The tax service has encountered all kinds of mileage accounting errors. Overly rounded or unusually high figures for your income level are a clear sign that your mileage wasn't recorded in real time.

Auditors don't demand perfection, but they do demand accuracy. A simple mileage tracking app or a notebook with odometer readings, dates, destinations, and the business purpose of each trip meets the requirements. The Tax Court has repeatedly rejected mileage deductions when taxpayers couldn't substantiate the details.

For the self-employed, mileage is one of the most valuable deductions: losing just 100 miles (160 km) per month means over $800 in lost deductions per year. But guesswork and rough estimates are the fastest way to lose it during an audit.

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Result: documents dispel suspicions

Most deductions are rejected not because they are inherently questionable, but because the documents don't hold up to scrutiny. Just like filing your tax return on time or correcting errors early, preparation significantly reduces the risk of serious problems.

Claim the deductions you're entitled to, retain simple evidence for each, and file your return with confidence. The overall risk of an audit is low. However, if questions do arise, careful records will allow you to quickly resolve the issue with minimal or no changes to your return.

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