If you had the Earned Income Credit, Child Tax Credit, Additional Child Tax Credit, Credit for Other Dependents, or American Opportunity Credit disallowed or reduced on a prior tax return, you may need to file Form 8862 to claim the credit again.
If the IRS reduced or disallowed a credit, they should send you a notice to let you know why it was disallowed and to tell you that you need to file Form 8862.
