First, do not amend your return until the IRS has processed your return. Sometimes, the IRS catch these errors if they are that type of mistake. Once your return has been processed, then prepare your amended return using the TurboTax software.
Yes, prepare the amended return using the original return numbers. IRS will make the adjustments according to the database.
Prepare the amended state at the same time as the federal. Two separate entities that will process independently. Just easier to continue in the amending process to include the state return, as well.
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