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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.
Amend a Return. If you discover an error on a previously filed return, you should file an amended return and pay any additional tax or fee due, including interest. If you have questions, please contact our Taxpayer Information Section at 1-800-400-7115.For assistance in calculating the interest due use the Interest Rate Calculator.mend a Return. If you discover an error on a previously filed return, you should file an amended return and pay any additional tax or fee due, including interest. If you have questions, please contact our Taxpayer Information Section at 1-800-400-7115.