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Filing your taxes might not be anyone’s idea of a good time, but messing them up can turn a routine task into a costly headache fast. The IRS isn’t exactly known for letting mistakes slide, especially when they involve missing money, missed deadlines, or questionable claims.
Most tax filing mistakes are completely avoidable if you know what to watch for. A few small oversights can lead to penalties, interest, or even audits—none of which you want showing up in your mailbox. Here are three of the most common (and expensive) tax filing mistakes so you can stay on the IRS’s good side this year.
1. Filing Late or Missing the Deadline Entirely
Missing the tax deadline is one of the most common tax filing mistakes, and it’s also one of the easiest to avoid. The IRS typically charges a failure-to-file penalty that can be up to 5% of your unpaid taxes for each month your return is late. Even if you can’t pay what you owe, filing on time is still critical because the penalty for not filing is much steeper than the penalty for not paying.
Many people assume they can skip filing if they don’t have the money, but that decision can snowball into serious financial consequences quickly. If you need more time, filing for an extension can give you breathing room, but remember—it doesn’t extend your payment deadline, just your paperwork.
2. Underreporting Income (Yes, They Usually Know)
Underreporting income might seem like a harmless mistake, but it’s one of the biggest red flags for the IRS. Whether it’s freelance work, side hustle income, or even investment gains, all earnings must be reported—even if you didn’t receive a formal tax form. The IRS uses automated systems to match income reported by employers, banks, and platforms against your return, so discrepancies are often caught quickly. A simple oversight, like forgetting a 1099 form, can trigger penalties and interest on the unreported amount. To avoid this tax filing mistake, keep a running list of all income sources throughout the year and double-check everything before submitting your return.
3. Claiming Incorrect Deductions or Credits
Deductions and credits can save you serious money, but claiming the wrong ones—or inflating them—can lead to penalties or audits. This tax filing mistake often happens when people misunderstand eligibility rules, especially for popular credits like the Earned Income Tax Credit or Child Tax Credit. For example, claiming a home office deduction without meeting the strict requirements can raise eyebrows with the IRS. While tax software has made filing easier, it’s still your responsibility to ensure everything you claim is accurate and supported by documentation. When in doubt, it’s smarter to skip a questionable deduction than risk paying it back with penalties later.
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Avoid Costly Tax Filing Mistakes Before They Happen
The truth is, most tax filing mistakes don’t come from bad intentions—they come from rushing, guessing, or simply not knowing the rules. Taking a little extra time to review your return, organize your documents, and double-check your numbers can save you a surprising amount of money and stress. If your situation is complicated—like owning a business, managing investments, or going through a major life change—it might be worth consulting a tax professional.
So before you hit “submit” this year, ask yourself: have you double-checked for these common tax filing mistakes, or are you taking a risk that could cost you later? We want to hear your success stories and struggles in the comments below.
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Brandon Marcus is a writer who has been sharing the written word since a very young age. His interests include sports, history, pop culture, and so much more. When he isn’t writing, he spends his time jogging, drinking coffee, or attempting to read a long book he may never complete.
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