When you Amend to change your Filing Status from Head of Household to Married Filing Jointly, you may not have to pay any of your Refund back. You should get Child Tax Credits either way.
The Amended Form 1040X will show if there is a Balance Due from your original filing to the new filing.
You have up to three years to Amend your Return.
Here's detailed info on How to Amend a Tax Return.
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