I got Letter 6419 from the IRS. What is it?

Letter 6419 is a letter that the IRS sent to everyone who received monthly Child Tax Credit (CTC) payments in 2021. The letters contain information about how much the IRS issued you in these monthly payments. In order to claim the rest of the Child Tax Credit on your 2021 tax return, you will need to report the amount the IRS paid you in advances — so this letter can be very helpful. Letter 6419 was sent in December 2021 or January 2022.

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