What this letter is about Letter 6417 highlights key changes to the 2021 Child Tax Credit that affect families with dependents under the age of 18. This letter is on White House letterhead and is signed by President Joseph R. Biden Jr. The American Rescue Plan Act expanded the Child Tax Credit to provide needed tax relief to almost all working families with children. The act authorized the IRS to pay half of your expected Child Tax Credit in advance, so you can receive it this year. You will claim the other half when you file your 2021 income tax return. If you received this letter, you should start receiving advance Child Tax Credit payments (also called child tax relief payment) automatically as early as July 15, 2021. How to learn more For more information, you can review a sample copy of Letter 6417 PDF or visit the Advance Child Tax Credit Payments in 2021 page.