The 1040-X: Amended U.S. Individual U.S. Income Tax Return is a form used by taxpayers who need to correct an error in a previously filed federal tax return.

Common mistakes corrected with this form include errors in the taxpayer’s filing status or number of dependents or omissions of credits or deductions.

Form 1040-X should not be used to correct simple mathematical errors in a tax return, as the Internal Revenue Service (IRS) routinely corrects such mistakes while processing returns.

IRS Form 1040-X is filed by taxpayers to amend an annual tax return that was previously filed.
To get a refund, the form must be filed within three years after the original return was filed or within two years after the tax was paid, whichever is later.
Form 1040-X should be used to correct material changes but not to fix mathematical errors.
Remember, if you file a 1040-X form you may also need to amend your state tax return.
Amended forms for the tax year 2019 and later can be prepared using standard tax preparation software.
You can e-file the form if you e-filed the corresponding tax return. Otherwise, mail it in.

Form 1040-X can be used to claim any extended tax benefits or disaster relief tax relief that you missed in filing your 2019 or 2020 returns.

A 1040-X form should be filed by anyone who has already filed a tax return and needs to amend it for any of the following reasons:

To correct Form 1040, 1040-SR, or 1040-NR. Most taxpayers use one of these three forms to file their annual tax returns.
To make an election after the deadline. For example, a married taxpayer can elect to file as an individual or jointly with a spouse.
To change an amount that was previously adjusted by the IRS.
To make a claim for a carryback due to a loss or unused credit.

1040X.

All pages of Form 1040X are available on the IRS website.

This form is an itemized, line-by-line description of all possible adjustments, so the taxpayer can clearly record the exact type and amount of each amendment and enter a brief description of what is being amended and why.

The filer must include not only the 1040-X but a revised version of the entire 1040 or 1040-SR, including any attached forms and schedules, even if they were not amended.

Taxpayers can e-file a Form 1040-X or send it to the IRS by mail. If you’re expecting a check, the IRS notes that electronic filers will get a faster response.

Form 1040-X can only be filed after an annual return is filed.

In order to receive a credit, taxpayers must file a 1040-X form within three years after the original return was filed or within two years after the tax was paid, whichever is later.

The IRS provides the following tips to taxpayers about Form 1040-X:

Wait for the first refund, if you were due one. If your original tax return included a refund, you should wait until you get it before filing Form 1040-X. The IRS will issue a separate, second refund if it is warranted, so feel free to cash the first check.
File a 1040-X form within the three-year amendment time period. If the change will affect your refund amount, you must file the form within three years from the date of your original tax return or within two years from the date of paying the tax amount, whichever is later. Any returns filed early will be considered filed on the official deadline date for filing taxes, which is usually April 15 of the calendar year.

You can file up to three amendments to an annual tax return. Any further amendments will be rejected.

Form 1040X. can be downloaded from the IRS website.

Here are the answers to some commonly-asked questions about Form 1040-X: Amended U.S. Individual U.S. Income Tax Return.

The 1040-X allows a taxpayer to amend or correct a previously filed tax return. If you forgot to claim a credit or record a deduction, this is the form to use. If you made a mathematical error, forget about it. The IRS always runs the numbers and corrects that kind of error.

If you owe money with your Form 1040-X you won’t be charged a penalty if you pay it in full with the form within one year of the tax due date.

You have to file Form 1040-X after filing your 1040, or 1040-SR, or 1040-NR. You’re amending your earlier tax return with the correct information.

If you e-filed your annual return, you can now e-file a 1040-X using commercial tax preparation software. That’s the fastest way to get your money back if you’re owed any.

You can send it in the mail if you prefer. The IRS lists four separate addresses for use by residents of different regions and for Americans living abroad.

Nope. Direct deposit is not currently available for refunds based on amended returns. You’ll get a check in the mail from the IRS.

The IRS says it can take up to 16 weeks to process an amended return even if it’s filed electronically.

About three weeks after you file the 1040-X, you can start checking the status of your filing on the IRS website, on a page aptly titled “Where’s My Amended Return?”


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