What is the deadline to file an amended claim regarding child tax credit payments not received?

do i need to file a 1040x or schedule 8812 to amend my tax return regarding child tax credit ?

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You generally have three years from the due date of the return to file an amended return to claim the Child Tax Credit. You can amend the return (1040X) and add the 8812. Note: If you efiled the original, you should efile as the paper returns take a VERY LONG time to get processed.

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