03/12/2025
Common Tax Filing Errors – Did You Know? (2/2)
Every year, many taxpayers may make mistakes on their returns that cause IRS processing delays. Some common errors may also result in paying too much or too little tax. A miscalculation in either direction can be costly, since the IRS may assess penalties for underpayment.
The following mistakes can cause filers to pay the wrong amount of tax:
Math Mistakes:
Even mathematicians sometimes make errors in simple addition and subtraction, and some of the calculations required for 1040 schedules can be complicated. Thoroughly double-check every bit of math on your return.
Incorrect Filing Status (Single, Married Filing Jointly, etc.):
The IRS will not accept a return showing a filing status that you are not eligible to claim. If you qualify for more than one status (for example, filing jointly or separately if you are married), the option you choose may significantly change your tax.
Incorrectly Figuring Credits or Deductions:
Once you determine that you qualify for a tax deduction or credit, you must carefully compute the amount that you can claim. Many taxpayers fail to take into account income limitations (including the calculations that must be made if your income falls within a “phase-out” range) and other restrictions. Others claim less than they could, or miss out on deductions and credits entirely by not filing the required forms and schedules. The IRS notes that filing errors are common among taxpayers eligible for the earned income credit (EIC) and/or Child and Dependent Care Credit.
Expired ITIN:
Those who file their IRS returns using individual tax identification numbers (ITINs) must keep in mind that ITINs periodically expire. Although a return filed with an expired ITIN may be accepted, the IRS generally will not allow any of the exemptions or tax credits claimed. The taxpayer must renew their ITIN in order to obtain the full refund that they are owed.
To avoid costly mistakes, the IRS recommends having a tax professional prepare or check your return and file it electronically. A tax pro might also help you claim deductions and credits that you would otherwise miss.