How to Change Last Year's Tax Filing
Tax forms are due on April 15 each year. If you have submitted your tax forms to the IRS on time but discover later that you had made a mistake or missed a deduction, do not worry. You can make an amendment to the tax return that you submitted. The IRS offers a form that makes it easy to make any changes to a previous year's tax filing. All you have to do is download the appropriate tax form to notate your changes and send it to the IRS.
Instructions
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Go to the IRS website (see Resources). Navigate to the "Forms and Publications" section of the site.
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Click on "Form and Instruction number (PDF)" under the "Download forms and publications by" heading.
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Search for Form 1040X. This is the tax form that is used to make amendments to a previous year's tax filing.
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Download and print Form 1040X.
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Enter in your tax changes onto Form 1040X. Sign and date the form, and mail it to the address listed on the form with any supporting documentation that you may have, like a W2.
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Tips & Warnings
Form 1040X has to be filed within three years of the date you filed the original tax return or two years from when you paid the tax, whichever is the later date. A return that was filed before April 15tis considered filed on April 15.