If you previously had the Earned Income Credit reduced or disallowed, the IRS would have notified you in writing. If you are unsure, you can call the IRS to find out. To call the IRS,
Before you call, make sure you know or have the following information handy:
IRS phone numbers
Customer service representatives are available Monday through Friday, 7 a.m. to 7 p.m. local time, unless otherwise noted. Residents of Alaska and Hawaii follow Pacific time. Puerto Rico phone lines are open 8 a.m. to 8 p.m. local time.
Individuals:
800-829-1040
Businesses:
800-829-4933
IF your Earned Income Credit (EIC), American Opportunity Tax Credit (AOTC), Child Tax Credit (CTC) (including the Additional Child Tax Credit (ACTC) Credit for Other Dependents (ODC)), or (AOC) American Opportunity Credit were previously reduced or disallowed for any reason other than a math or clerical error, you must complete Form 8862 and attach it to your tax return to claim them.