Mistakes can happen when preparing a tax return – and that can cause delays or even rejected returns. Knowing what to lookout for can help taxpayers be better prepared when they file their federal tax return.

Electronically filing a tax return reduces errors because the tax software does the math, flags common errors and prompts taxpayers for missing information. The IRS urges all taxpayers to file electronically and choose direct deposit to get their refund faster. Taxpayers can file for free using IRS Direct File, IRS Free File or the Volunteer Income Tax Assistance or Tax Counseling for the Elderly programs.

Common errors

Here are some common errors taxpayers should try to avoid:

• Missing or inaccurate Social Security numbers: Each Social Security number on a tax return should appear exactly as printed on the Social Security card.  

• Misspelled names: The name listed on a tax return should match the name on that person's Social Security card.  

• Incorrect filing status: Some taxpayers choose the wrong filing status. The Interactive Tax Assistant on IRS.gov can help taxpayers choose the correct status especially if more than one filing status applies.  

• Math mistakes: Math errors are common and can range from simple addition and subtraction errors to more complex calculations. Taxpayers should always double-check their math.  

• Figuring credits or deductions: Taxpayers can make mistakes figuring things like their Earned Income Tax Credit, or the Child and Dependent Care Credit. The Interactive Tax Assistant can help determine if a taxpayer is eligible for tax credits or deductions. Tax software will calculate these credits and deductions and include any required forms and schedules.  

• Incorrect bank account numbers: Taxpayers expecting a refund should choose direct deposit. They should verify their account and routing numbers with their financial institution and double-check the accuracy of the numbers they enter on their return before they sign and submit it.  

• Unsigned forms: An unsigned tax return isn't valid. For certain filing statuses, both spouses must sign a joint return. However, exceptions may apply for members of the armed forces or other taxpayers who have a valid power of attorney. Taxpayers can avoid this error by filing their return electronically and digitally signing it before sending it to the IRS.  

• Filing with an expired Individual Tax Identification Number: If a taxpayer has an expired ITIN, they should go ahead and file using the expired number. The IRS will process that return and treat it as a return filed on time. However, the IRS won't allow any exemptions or credits on a return filed with an expired ITIN: these taxpayers will receive a notice telling them to renew their number. Once they have done so, the IRS will process their return normally.

Using commercial tax software or a reputable tax preparer – including certified public accountants, enrolled agents or other knowledgeable tax professionals – can also help avoid errors. To find out more check out Prepare to File in 2025: Get Ready for Tax Season with Key Updates, Essential Tips