12/26/2021
The IRS will send Letter 6419, 2021 Advance CTC, starting late December 2021 and continuing into January. The letter will include the total amount of advance Child Tax Credit payments you received in 2021 and the number of qualifying children used to calculate the advance payments. You should keep this and any other IRS letters about advance Child Tax Credit payments and provide this to me with your other tax information.
You can also check the amount of your payments by using the CTC Update Portal available on IRS.gov.