No, it's not set in stone. If using 2019 income gives you a larger credit, then you can file an amended return. You should wait until any refund you are expecting has been received before attempting to amend. Also, do not make any changes in your return until you amend. For information on amending your return go to:
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
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