After you file

When filing an amended or corrected return:

• Include copies of any forms and/or schedules that you're changing or didn't include with your original return. You will be including Form 8995 or 8995-A for QBI.
• To avoid delays, file Form 1040-X only after you've filed your original return. Generally, for a credit or refund, you must file Form 1040-X within 3 years after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later.
• If you file an amended or corrected return before the due date for the original return, the amended return will replace or supersede the original return. Filing a superseding return and paying any additional taxes owed may allow you to avoid interests or penalties.
• Allow the IRS up to 16 weeks to process the amended return.