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Zero if you complete the 1040X yourself. If you e-filed your original return, then the provider may complete a 1040X for you at no charge. t Regardless of how you do it, the amended form must be mailed to the IRS.
1 When to file. 2  To claim a refund, you generally must file Form 1040X within three years from the date you filed your original tax return or within two years from the date you paid the tax, whichever is later. 3  Processing time.4  Normal processing time for amended returns is 8 to 12 weeks.ere are 10 tips from the Internal Revenue Service about amending your federal tax return: 1  When to amend a return. 2  You should file an amended return if you need to correct your filing status, number of dependents, total income, tax deductions or tax credits.