Tax season can be a stressful time, and it’s easy to make mistakes when filing your taxes. However, knowing the most common mistakes and how to avoid them can save you time, money, and potential headaches. In this blog, we’ll explore the top mistakes people make when filing their taxes and provide examples to help you better understand each issue. Let’s get started!

Mistake 1: Filing Late or Missing the Deadline

Missing the tax filing deadline can result in late-filing penalties and interest charges, which can add up quickly. To avoid this mistake, make sure to file your taxes on time. If you need more time to gather information or complete your return, consider filing an extension (Form 4868) to avoid late-filing penalties. Keep in mind that an extension only provides additional time to file, not to pay any taxes owed.

Example: John was busy with work and personal matters, causing him to miss the April 15th deadline. He now faces late-filing penalties and interest charges, which could have been avoided had he filed for an extension.

Mistake 2: Incorrect or Incomplete Personal Information

Providing incorrect or incomplete personal information, such as a misspelled name, wrong Social Security number, or incorrect address, can cause processing delays or even result in your return being rejected. Double-check all personal information to ensure accuracy before submitting your tax return.

Example: Jane accidentally transposed two digits in her Social Security number. The IRS rejected her return, and she had to resubmit it with the correct information.

Mistake 3: Choosing the Wrong Filing Status

Selecting the incorrect filing status can affect your tax liability, deductions, and credits. Be sure to choose the appropriate filing status based on your situation, such as single, married filing jointly, married filing separately, head of household, or qualifying widow(er) with a dependent child.

Example: Mike, a single father, mistakenly chose “Single” instead of “Head of Household” as his filing status. This error resulted in a higher tax liability and reduced credits.

Mistake 4: Math Errors and Miscalculations

Math errors and miscalculations are common mistakes that can lead to an incorrect tax liability or refund. Carefully review your calculations, or consider using tax software or hiring a professional to help ensure accuracy.

Example: Sarah miscalculated her itemized deductions, which led to an underpayment of her taxes. The IRS later discovered the mistake and sent her a notice for the additional taxes owed, along with interest and penalties.

Mistake 5: Not Reporting All Income

Failing to report all income, including wages, self-employment income, interest, dividends, and other sources, can result in penalties and interest charges. Review all income documents, such as W-2s, 1099s, and other forms, to ensure you’re accurately reporting your income.

Example: Tom neglected to report income from a side gig on his tax return. The IRS later discovered the omission and assessed penalties and interest on the unreported income.

Mistake 6: Overlooking Deductions and Credits

Many taxpayers overlook valuable deductions and credits, which can result in a higher tax liability or smaller refund. Research deductions and credits that may apply to your situation, such as the Earned Income Tax Credit, Child Tax Credit, or education credits.

Example: Lisa, a college student, didn’t realize she was eligible for the American Opportunity Tax Credit, which could have reduced her tax liability or increased her refund.

Mistake 7: Failing to Claim the Correct Dependents

Claiming the wrong dependents or not claiming dependents when you’re eligible can lead to a higher tax liability or a smaller refund. Make sure to claim the appropriate dependents based on IRS guidelines, including children, relatives, or other individuals who meet the dependency requirements.

Example: Peter, a single father, didn’t realize he could claim his elderly mother as a dependent since she lived with him and relied on him for more than half of her support. By not claiming his mother, Peter missed out on a valuable dependent exemption and a higher refund.

Mistake 8: Incorrectly Classifying Workers

Business owners sometimes misclassify workers as independent contractors instead of employees, which can lead to penalties and back taxes. Make sure to classify workers correctly based on IRS guidelines to avoid potential issues.

Example: Emily, a small business owner, classified her part-time workers as independent contractors to avoid paying payroll taxes. The IRS later determined that these workers were actually employees, resulting in back taxes, penalties, and interest charges for Emily.

Mistake 9: Not Keeping Accurate Records

Failing to keep accurate records of income and expenses can make it difficult to accurately complete your tax return and may raise red flags during an audit. Maintain organized records throughout the year, including receipts, invoices, and statements, to support your income and deductions.

Example: Jack, a self-employed graphic designer, did not keep track of his business expenses throughout the year. As a result, he struggled to accurately report his deductions and potentially missed out on tax-saving opportunities.

Mistake 10: Ignoring Tax Notices and Correspondence

Ignoring tax notices and correspondence from the IRS can result in additional penalties, interest, and even collection actions. If you receive a notice, review it carefully and respond promptly to resolve any issues or discrepancies.

Example: Susan received a notice from the IRS regarding a discrepancy in her reported income. Instead of addressing the issue, she ignored the notice. The IRS later assessed additional taxes, penalties, and interest, which could have been minimized or avoided had she responded in a timely manner.


By being aware of these common tax filing mistakes and taking the necessary steps to avoid them, you can reduce the likelihood of errors, penalties, and interest charges. Always double-check your information, stay organized, and seek professional advice when necessary. By doing so, you can confidently file your taxes and ensure you’re taking advantage of all available deductions and credits.