Tax Return Mistakes: What to Do If You Filed Your Income Tax Return Incorrectly

Made a mistake on your income tax return? Learn when to file an amended tax return, how Form 1040-X works, and what to expect from the IRS.

Filing your income tax return can be stressful, especially when you discover a mistake after submitting it. Whether you entered the wrong income, missed a deduction, or reported an incorrect filing status, you may be wondering: Can I fix my tax return after filing?

The good news is that many tax return mistakes can be corrected. Understanding when to file an amended tax return can help you avoid unnecessary delays and ensure your tax information is accurate.

What Tax Return Mistakes Need to Be Corrected?

According to the IRS, taxpayers may need to amend a federal income tax return when they discover an error involving income, deductions, credits, dependents, filing status, tax liability, or withholding.

However, not every mistake requires an amended return. For example, the IRS may correct certain mathematical errors during processing or contact you if additional information is needed.

How Do You Amend a Tax Return?

If you need to make a correction, you will generally use Form 1040-X, Amended U.S. Individual Income Tax Return. The amended return should explain the changes and include applicable supporting forms or schedules.

Before filing, review your original return carefully and gather documentation supporting the correction. If your federal return changes your taxable income or other information, remember that it could also affect your state income tax return.

How Long Does an Amended Tax Return Take?

One of the most common income tax questions is how long an amended return takes. The IRS says amended returns generally take 8 to 12 weeks to process, although some cases can take up to 16 weeks. You can generally check the status about three weeks after submitting your amended return.

Get Help With Your Income Tax Questions

Tax laws and filing requirements can be complicated, and a mistake can have financial consequences. If you’re unsure whether you should amend your return or need help understanding your tax situation, working with a qualified tax professional can provide clarity.

At AIM Financial, we help clients navigate important tax and financial questions with practical, personalized guidance. Don’t let an income tax mistake leave you guessing about your next step—get professional guidance and make sure your tax strategy is working for you.

This article is for general educational purposes and is not tax, legal, or financial advice. Tax situations vary, so consult a qualified professional regarding your specific circumstances.