Yes! You can use AI to fill out Form 1040, U.S. Individual Income Tax Return

This mistake often happens due to a simple typo or not using the exact name as it appears on the Social Security card. The IRS matches the name and SSN provided with the Social Security Administration's database. A mismatch will cause an e-filed return to be rejected immediately and will significantly delay the processing of a paper return and any associated refund. To avoid this, carefully double-check that the first name, last name, and SSN for yourself, your spouse, and any dependents are entered exactly as they appear on the official cards.

Choosing a filing status can be confusing, leading people to select one that is incorrect for their situation, such as claiming 'Head of Household' without meeting the strict support and residency tests. This mistake can result in paying more tax than necessary or, conversely, claiming tax benefits you aren't entitled to, which can lead to an audit, back taxes, and penalties. To prevent this, carefully review the IRS criteria for each status (Single, Married Filing Jointly, Married Filing Separately, Head of Household, and Qualifying Surviving Spouse) before making a selection.

Mistakes in this section are frequent and include misspelling a dependent's name, entering an incorrect SSN, or failing to check the correct box for the Child Tax Credit. These errors occur due to data entry mistakes or misunderstanding the complex rules for claiming a dependent. The consequence is the disallowance of valuable credits, leading to a smaller refund or a higher tax bill, and processing delays while the IRS requests clarification. Always verify dependent information against their Social Security card and confirm they meet all eligibility tests for the credits you are claiming.

Many people are unsure what constitutes a 'digital asset' transaction, leading them to incorrectly check 'No' at the top of the form. This question covers not just selling crypto, but also receiving it as payment, exchanging one crypto for another, or receiving it as a reward. Answering incorrectly can be seen as misrepresenting your financial activities to the IRS, which could trigger an audit and result in penalties for unreported income. To avoid this, review all your financial activities for the year; if you interacted with digital assets in any way, you must check 'Yes' and report any taxable transactions.

Filers often forget to include income from side jobs, freelance work (Form 1099-NEC), interest from savings accounts (Form 1099-INT), or wages from a short-term job (Form W-2). The IRS receives copies of these forms from the payers and uses an automated system to match them to your return. Failing to report this income will result in a CP2000 notice from the IRS for underreported income, which includes the owed tax plus penalties and interest. Gather all W-2s, 1099s, and other income statements before you begin filing to ensure everything is included.

People often fail to choose the deduction method that saves them the most money or forget to check boxes that increase their standard deduction, such as for age or blindness. This can happen from a lack of awareness or a failure to calculate both options. The result is paying more tax than legally required. To avoid this, calculate your itemized deductions on Schedule A and compare the total to the standard deduction for your filing status, choosing whichever is larger. AI-powered tools like Instafill.ai can help automatically determine the most advantageous deduction for you.

Transposing a single digit in the routing or account number (Lines 35b and 35d) is a very common and costly error. This happens when rushing or entering the numbers from memory. An incorrect number can cause your refund to be sent to the wrong account, significantly delayed while the bank rejects the transfer, or converted to a paper check that is mailed to your address, taking weeks longer to arrive. To prevent this, carefully copy the routing and account numbers directly from a check or an official bank statement and double-check your entry.

Forgetting to sign the form is one of the most basic yet frequent errors, especially on paper-filed returns. For joint returns, both spouses must sign. An unsigned tax return is considered invalid by the IRS and will not be processed. This will delay your refund and can result in late-filing penalties if the signed return is not submitted by the deadline. Always perform a final review of the 'Sign Here' section to ensure all required signatures and dates are present before mailing.

When filling out a form manually, it's easy to make simple arithmetic mistakes when adding or subtracting lines to calculate total income, adjusted gross income, or the final tax due. While the IRS will often correct minor math errors, this can alter your expected refund or balance due and may delay processing. If the form is a non-fillable PDF, tools like Instafill.ai can convert it into a fillable version that performs calculations automatically, eliminating the risk of manual math errors and ensuring accuracy.

Filers often check a box or enter an amount on the Form 1040 that requires a supporting schedule (e.g., Schedule A for itemized deductions, Schedule D for capital gains) but then forget to attach the schedule itself. This renders the return incomplete in the eyes of the IRS. The consequence is a processing delay and a notice from the IRS requesting the missing information, holding up any refund until the complete documentation is received. To avoid this, create a checklist of all required schedules as you fill out the 1040 and verify they are all attached before you file.