What this notice is about This notice says you may qualify for the Additional Child Tax Credit and be entitled to some additional money. What you need to do Read your notice carefully. Complete the Additional Child Tax Credit Worksheet on Form 15110 PDF. If the worksheet confirms you have at least one qualifying child, sign and date the Form 15110 PDF, and complete Form 1040 Schedule 8812, Credits for Qualifying Children and Other Dependents. Mail both the Form 15110 PDF and Form 1040 Schedule 8812 in the envelope provided. Frequently asked questions I lost the return envelope. Where do I mail my worksheet and Form 8812? Mail the worksheet and form to the address listed on the top left corner of the worksheet. The IRS center listed handles cases in your region, so you must send it there to avoid potential delays in processing. What is the difference between the Child Tax Credit and the Additional Child Tax Credit? Can I qualify for both? The Child Tax Credit is for people with a qualifying child. You can claim up to $3,600 for each qualifying child under age 6 and $3,000 for each qualifying child over age 5 and does not turn 18 before January 1st, 2022. The Additional Child Tax Credit is worth up to $1,400 per qualifying child and is for individuals who receive less than the full amount of Child Tax Credit. You may qualify for both the Child Tax Credit and the Additional Child Tax Credit. I sent you my Form 15110 PDF and Form 1040. When will I get the refund We will review your Form 1040 PDF and Form 15110 PDF and make a determination on your credit. If we deny your credit, we will send you a letter explaining why. However, if you owe no other amount, you should receive your refund in 8 to 10 weeks. If you don't hear from us after 8 to 10 weeks, call our Where’s My Refund? toll-free line at 800-829-1954 to check on the status of your refund. My son or daughter turns 18 this year. Can I still get the Additional Child Tax Credit? No. Your child must be under age 18 at the end of 2021 to qualify for both the Child Tax Credit and the Additional Child Tax Credit. Helpful information • Publication 972, Child Tax Credit and Credit for Other Dependents • Instructions for Form 1040 PDF Tips for next time you file If you have dependent children, remember to claim the Additional Child Tax Credit the next time your file your Form 1040, U.S. Individual Income Tax Return. To do this, complete a Form 1040 and attach Form 1040 Schedule 8812 to your return. Consider filing your taxes electronically. Filing online can help you avoid mistakes and find credits and deductions in which you may qualify. In many cases you can file for free. Learn more about e-file. Reference Tools Publication 1, Your Rights as a Taxpayer Full list of tax forms and instructions Need Help? You can authorize someone to contact the IRS on your behalf. See if you qualify for help from a Low Income Taxpayer Clinic. If you can’t find what you need online, call the IRS number at the top of your notice or letter.