IRS Form 15110 – Fillable PDF (Additional Child Tax Credit)

Form 15110 is the Additional Child Tax Credit Worksheet the IRS sends when you receive a CP08 notice. It lets you claim any refundable portion of the child tax credit that wasn’t captured on your original return.

What Is Form 15110 and When Do You Need It?

This one‑page worksheet collects:

• Taxpayer contact information
• Social Security numbers for you, your spouse, and each qualifying child
• Eligibility details for each child (age, relationship, residency, etc.)

If the IRS has told you to complete Form 15110, you must return it with any required supporting documents to claim the additional credit.

How to Complete Form 15110 Online with Formize

Instead of printing, printing, and scanning, use our Formize PDF Filler – a secure, browser‑based editor that works on any device.

1. Click the "Fill out this form" button on this page.
2. Wait a few seconds while the Formize PDF Filler app loads the fillable PDF.
3. Enter your information exactly as it appears on your tax return.
4. Review each field for accuracy; the filler highlights required fields.
5. When you’re done, click Save & Download to get a completed PDF you can attach to your CP08 response.

Common Mistakes & Tips for a Smooth Submission

• Social Security numbers: Double‑check every SSN. A missing or transposed digit will delay processing.
• Child eligibility: Verify that each child is under 17, lives with you > ½ year, and is a U.S. citizen or resident.
• Address changes: Use the most recent address on your last filed return; update it in the form if needed.
• Signature: The fillable PDF allows you to type a digital signature. Make sure it’s legible.
• Supporting documents: Attach any required proof (e.g., birth certificates) as separate PDFs when you upload your response.

Download the Official Fillable PDF

Need the original PDF for offline use? Click the link below to download the IRS‑provided fillable version.

Download IRS Form 15110 (PDF)