Contact information
Your name and Social Security number, a spouse's name and number for a joint return, a current address if it changed, and two phone numbers with the best time to call.
15110
Additional Child Tax Credit Worksheet
- Agency
- IRS
- Revision
- Rev. 2-2026
- Fillable fields
- 38
- Pages
- 1
- Official source
- IRS form page
- Checked
- October 21, 2026
Form 15110: Additional Child Tax Credit Worksheet
Form 15110 is the Additional Child Tax Credit Worksheet. It goes with IRS notice CP08: the form says to complete it and send it back with the required supporting documents, and to refer to the CP08 notice for information on using the Document Upload Tool.
The worksheet asks for contact information and, for each dependent child claimed on the 2025 tax return, the child's name, Social Security number and whether the child meets all of the eligibility factors the form lists. The form says that if there is at least one qualifying child, the worksheet goes back with a completed Schedule 8812, Credits for Qualifying Children and Other Dependents.
This page holds the February 2026 edition (Rev. 2-2026). You can fill out the PDF free in your browser on this page and download the result without an account.
What's on Form 15110
Social Security number rule
The form says each child must have a Social Security number valid for employment issued before the return's due date, including extensions, unless the child was born and died in 2025.
Eligibility factors
Eight factors for a qualifying child for 2025, including being under age 17 at the end of the year, the relationship test, living with you more than half the year and being claimed as your dependent.
Child table
Five rows for each child's name and Social Security number, with Yes and No boxes for whether the child meets all the eligibility factors.
How many children qualify
A space for the count of qualifying children, with the note to send the worksheet and a completed Schedule 8812 if at least one child qualifies.
How to fill out Form 15110
- 1
Contact information
Enter your name and Social Security number, and your spouse's if you filed a joint return. If your address changed, the form says to give the current address, call 800-829-0922 or visit www.irs.gov.
- 2
List each child
For each dependent child claimed on your original 2025 return, enter the name as it appears on the Social Security card and the Social Security number. Additional children go on a separate paper.
- 3
Answer Yes or No
For each child, check Yes or No for whether the child meets all the eligibility factors. The form says a child doesn't qualify with a No to any factor, and may qualify with Yes to all.
- 4
Count qualifying children
Enter how many children qualify. With at least one, the form says to send the worksheet together with a completed Schedule 8812.
- 5
Add supporting documents
Include the required supporting documents. For a child born and died in 2025, the form asks for a copy of the birth certificate or hospital records showing a live birth.
Why fill Form 15110 on indox
You get the real form, filled in a browser tab, with nothing standing between you and the finished PDF.
- Fill the form right in your browser, no software to install
- Free to fill and free to download, with no account
- The official blank straight from the IRS, not a copy someone retyped
- Works on a phone, tablet or computer
How to send it back
Document Upload Tool
The form says to send it with the required supporting documents using the Document Upload Tool, and to refer to notice CP08 for information on using the tool.
By mail
The form says it and the supporting documents can also be sent in the envelope enclosed with the notice.
Schedule 8812
If at least one child qualifies, the worksheet goes back with a completed Schedule 8812, Credits for Qualifying Children and Other Dependents.
More information
The form points to IRS.gov/CP08 for more information, and to 800-829-0922 or www.irs.gov for an address change.
Related forms
1040
Credits for Qualifying Children and Other Dependents
41 fields, 2 pages
1040-X
Amended U.S. Individual Income Tax Return
166 fields, 2 pages
1040
U.S. Individual Income Tax Return
199 fields, 2 pages
14815
Supporting Documents to Prove Eligibility for the Child Tax Credit (CTC) and Credit for Other Dependents (ODC)
1 field, 1 page
Who fills out Form 15110?
The taxpayer who received notice CP08 completes the worksheet and sends it to the IRS. It covers children already claimed on the original 2025 return.
Official sources and the blank
Do it all with indox
No tool matches that search.
Questions about Form 15110
Why did I get Form 15110?
The form goes with IRS notice CP08 about the Additional Child Tax Credit. It refers to the notice for how to send it, and to IRS.gov/CP08 for more information.
Can I add a child I didn't claim on my return?
No. The form says not to include any child that wasn't reported on the original 2025 return, and points to Form 1040-X to claim the credit for those children.
What else goes with the worksheet?
The required supporting documents and, if at least one child qualifies, a completed Schedule 8812, Credits for Qualifying Children and Other Dependents.
How do I send Form 15110?
The form says to use the Document Upload Tool described in notice CP08, or to mail it in the enclosed envelope.
What if I have more than five children to list?
The form says to include the name, Social Security number and eligibility factor response for additional children reported on the original return on a separate paper.