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This form will be used by the United States Internal Revenue Service. A Form 1040-X is used for tax filing purposes. It will be used if you need to amend a tax form that you filed in a previous tax year. This could be used if you were married but did not file correctly or if you made a mistake on your tax filing forms in a prior tax year.
This form will require the exact information you used on the previous tax form. This includes the name you used, the tax ID number you used, how you filed, and the address you lived at. You will then need to recalculate the taxes for that year, using the information you want to change. Below this, you will need to describe the changes you made and why you made them before signing and dating the form.
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