Yes. If you already filed your tax return and you do not think you claimed the CTC, then you will have to amend to get the CTC. Before you amend though, look at your tax return and make sure that there is not an amount on Line 19 or on Line 28. These are the lines where the additional CTC will show up.
Do you recall entering the information from Letter 6419 that you would have received with the amount of ACTC you received and the number of dependents?
