1. Misspelled Names
Yes, one of the most common mistakes people make when they file taxes is misspelling their own, or family members’, names. This includes using different names (nicknames, abbreviations, etc.) on different parts of the return. You must write your name as it appears on your social security card to ensure your return goes through smoothly.

2. Math Errors
Are you one of those people who can add up the same column of numbers three times and get three different totals? If so, be sure to quadruple check the math on your return to avoid penalties and ensure you get your full refund.

3. Failure to Sign
Whew! You filled out the return checked the math and you can make it to the post office just in time for the April 18 postmark. Don’t forget to sign it! The IRS will not accept unsigned returns so it’s essentially the same as missing the deadline completely. That will delay your refund and you’ll have to pay a late filing penalty.

4. SSN Mistakes
All those numbers! Although you do not want to get this one wrong, it is a fixable mistake. Generally, the IRS will send you a letter asking for an amended return if your information doesn’t match their files. If you e-file your return will be rejected immediately so you can fix it right away.