What You Can Deduct, What You Might Be Missing, and What Raises Red Flags

Running a business means making constant decisions about spending money. What many business owners do not realize is that how those expenses are tracked and categorized often matters more than the expense itself.

As we head into the 2025 tax filing season, here is a clear, practical breakdown of what business write-offs still apply, which deductions are commonly missed, and which ones tend to attract extra attention from the Internal Revenue Service when books are not handled correctly.

This article reflects current federal tax rules as they apply to most small and mid-sized businesses.

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The Basic Rule for All Business Deductions

For an expense to be deductible, it must be:

Most problems we see do not come from illegal deductions. They come from poor tracking, vague descriptions, or mixing personal and business activity.

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Business Meals in 2025; What Is Still Deductible

Meals That Are Deductible at 50%

In 2025, most legitimate business meals are 50% deductible, including:

To stay compliant, you should document:

The temporary 100% restaurant deduction ended in 2022 and does not apply in 2025.

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Meals That Are Not Deductible

Meals are one of the most commonly adjusted deductions during reviews because personal spending is often miscoded as business.

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Commonly Missed Business Write-Offs

Many businesses overpay in taxes simply because certain expenses never make it into the books correctly.

Home Office Expenses (When Done Correctly)

A home office can be deductible if it is:

Eligible expenses may include:

When documented properly, this deduction is legitimate. When guessed or exaggerated, it becomes risky.

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Mileage and Vehicle Use

You may deduct either:

Commonly missed items include:

A mileage log is essential. High vehicle deductions without logs often trigger questions.

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Software and Subscriptions

Often overlooked deductions include:

If the software is used to operate the business, it is generally deductible.

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Professional Services

Fully deductible expenses typically include:

These are among the least challenged deductions when categorized properly.

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Education and Training

Training expenses are deductible when they:

Examples include:

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Write-Offs That Commonly Raise Red Flags

Certain deductions are legal but receive extra scrutiny when they appear excessive or poorly documented.

Home Office Abuse

Red flags include:

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Meal Expenses That Look Personal

Examples that get questioned:

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Vehicle Deductions That Are Too High

Auditors often question:

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Excessive “Other Expenses”

“Other” is one of the first categories reviewed when:

Clear categorization matters.

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Businesses That Look Like Hobbies

If a business:

Deductions may be limited or disallowed entirely.

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What the IRS Actually Looks At

Most reviews are triggered by patterns, not single deductions. Common triggers include:

Clean, well-organized books reduce risk far more than avoiding deductions.

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The QB-LA Approach to Write-Offs

At QB-LA, our focus is not aggressive deductions. It is defensible deductions.

That means:

Most tax issues we resolve could have been avoided with better bookkeeping earlier in the year.

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Keep These Things In Mind

If you are unsure whether your write-offs are helping you or quietly increasing risk, that is exactly where professional review pays for itself.

QB-LA helps Southern California businesses keep their books accurate, compliant, and audit-resistant year-round.