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No, once you submit a certification, it cannot be edited. You may submit another certification with your updated responses; however, the additional certification will not override the previous certification. When completing an additional certification, the certification will contain certain editable pre-populated information based on responses you provided in your previous certification. The IRS will keep copies of all submitted certifications.
Sources:
Instructions for Form 1040-X (01/2023)
Publication 1380
