Here is the clear, friendly walkthrough I use with parents and tax teams so you can update the IRS quickly, avoid notices, and move on with your life.
Key Takeaways
- Form 15101 tells the IRS that your adopted child now has an SSN and that the temporary ATIN should be retired.
- File as soon as the SSN is issued. From that point forward, stop using the ATIN on your returns.
- Submit by mail to the ATIN Unit at Stop 6182 in Austin, by overnight to the Interregional Highway address, or respond using the IRS Document Upload Tool only if your CP notice says you can.
- Use the fax number listed on your CP notice if you choose to fax. Keep your proof of transmission.
- For address changes, use Form 8822, not the address line on Form 15101.
Quick rule of thumb: SSN in hand means file Form 15101 now, then use the SSN on all current and future returns.
What Form 15101 Is and Who Should Use It
Form 15101, Provide a Social Security Number SSN) for Adoptive Child, is how you tell the IRS that your child now has an SSN and that the ATIN on your account should be replaced. The IRS includes Form 15101 with several ATIN notices, and you can also respond using the Document Upload Tool if your specific notice authorizes it.
Use it if all of the following are true:
- Your child was previously issued an ATIN for tax filing.
- The Social Security Administration has now assigned an SSN for your child.
- You need the IRS to update your records and retire the ATIN.
Important boundary:
- Do not use Form 15101 to request an SSN. Only the Social Security Administration can issue one.
Why timing matters
Filing Form 15101 right after the SSN arrives helps you avoid mismatches, processing delays, and follow up notices. Several IRS CP notices, including CP560 and CP561 series, tell you to complete Form 15101 once you receive an SSN.
Form 15101 vs. W‑7A vs. 15100, Which One Do You Need?
Choosing the right form depends on where you are in the adoption timeline. Here is a quick map.
| Form | Use this when | How you submit | Extra notes |
| W‑7A, Application for ATIN | Adoption is pending and the child has no SSN | Mail to Stop 6182 in Austin, or submit via a TAC that forwards your application | Expect about 4 to 8 weeks for processing. The ATIN phone line is 737‑800‑5511. |
| 15100, ATIN Extension Request | Your ATIN is expiring and you still do not have an SSN | Included with certain CP notices, reply by upload when allowed, or by fax or mail per notice | Used to request a 1‑year extension and to communicate updates noted in the notice. |
| 15101, Provide SSN for Adoptive Child | You now have your child’s SSN and need the IRS to replace the ATIN | Respond per your CP notice using the Document Upload Tool when offered, or send by mail, overnight, or fax | Do not use to obtain an SSN. Use only after the SSN is assigned. |
What-How-Wow in practice
- What: Form 15101 updates the IRS from ATIN to SSN.
- How: Complete parent information, the child’s SSN and name, the old ATIN, sign, and submit per your notice or to the Austin addresses below.
- Wow: If you file promptly, you reduce rework during tax season and protect eligibility for benefits that require an SSN, such as the EITC.
When to File Form 15101 After Your Child Gets an SSN
File immediately. IRS guidance tied to the CP560 and CP561 series explicitly instructs you to complete Form 15101 once you receive the SSN for your child. That way the IRS stops expecting an ATIN on your return and aligns your account with Social Security. You can often respond online with the Document Upload Tool if your specific letter includes that option.
If you received a CP561C stating that an ATIN expired, detach and include the stub with your response. This helps the IRS match your SSN update to the right ATIN record.
If you do not have an SSN yet and the adoption is still pending, request an ATIN extension with Form 15100 using the reply options in your notice, rather than filing Form 15101 prematurely.
Complete Form 15101 Step by Step
Before you start, have your child’s Social Security card and any IRS notice stubs handy. If a CP560 or CP561 notice came with a detachable stub, plan to include it with your filing.
Parent and contact details
- Enter up to two adoptive parents’ full names and SSNs.
- Provide your current mailing address.
- Add two phone numbers and your preferred call times, so the ATIN Unit can reach you if needed.
For permanent address changes, file Form 8822 separately. Do not rely on Form 15101 to update your address across IRS systems.
Child identification
- Enter the child’s SSN exactly as it appears on the Social Security card.
- Enter the child’s full legal name.
- List the prior ATIN that the IRS issued for your child.
Signatures
- Sign and date where indicated. If two adoptive parents are listed, both should sign.
Attachments
- Include the detachable stub from any CP560 or CP561 notice you received. This helps the IRS link your update to the correct account.
- Only include documents your notice specifically asks for. When in doubt, keep it simple and follow the notice checklist.
How to Submit Form 15101
You have four legitimate paths. Choose the one your notice allows and keep proof of submission.
1) Mail
Standard mail address for the ATIN Unit:
- Department of the Treasury, Internal Revenue Service, Stop 6182, Austin, TX 73301‑0066.
Tip: Use USPS with tracking and keep a copy of everything you send.
2) Overnight or private delivery
Use the IRS Austin street address for express couriers:
- Internal Revenue Service, 3651 S. Interregional Highway 35, Stop 6182, Austin, TX 78741.
Ask your carrier for written proof of the mailing date.
3) Fax
If your CP notice lists a fax option, use the fax number shown in your notice and keep the transmission confirmation page with your records. IRS CP pages instruct you to fax to the number in your letter if you prefer that method.
4) IRS Document Upload Tool
Many ATIN notices now accept secure uploads through the IRS Document Upload Tool. Your letter will either include an access code or direct you to choose the specific notice number from a menu. Follow the on‑screen prompts and save the confirmation.
Good to know: The IRS says not every form or situation can be uploaded. Only use the Document Upload Tool if your letter explicitly authorizes it.
Processing timelines and status checks
If you are applying for, or extending, an ATIN with W‑7A or 15100, plan for about 4 to 8 weeks after the IRS receives a complete package. If it has been at least 8 weeks with no update, call the Austin Service Center at 737‑800‑5511 for ATIN status. This number is not toll‑free.
Once you have an SSN and file Form 15101, the update itself is usually faster than an ATIN application. Keep copies of everything and wait for your next filing to reflect the SSN.
Common Pitfalls and Simple Fixes
| Pitfall | Better move | Why it matters |
| Uploading without permission | Only use the IRS Document Upload Tool if your notice allows it | The IRS may not accept uploads unless your specific letter authorizes them. |
| Using 15101 to get an SSN | Apply with the Social Security Administration for the SSN | Only SSA issues SSNs, not the IRS. |
| Address changes on 15101 | File Form 8822 to change your address with the IRS | Keeps your master address updated across IRS systems. |
| ATIN expired, no SSN yet | Use Form 15100 to request a 1‑year extension per your CP notice | Prevents lapses while the adoption is pending. |
FAQs
What documents do I need for the Adoption Tax Credit?
You will need your child’s SSN or ATIN plus adoption records and receipts that prove qualified expenses. If you used an ATIN during a pending adoption, update the IRS with Form 15101 as soon as you receive the SSN, then use the SSN on your tax return going forward. For EITC eligibility, an SSN is required.
How do I update Social Security after adoption?
You apply with the Social Security Administration for your child’s SSN. The SSA provides Form SS‑5 and instructions. Once the SSN is issued, send Form 15101 to the IRS to retire the ATIN and update your records.
What do I file if my ATIN is expiring and there is still no SSN?
Use Form 15100 to request a one‑year extension, following the reply options in your CP notice, including upload when offered. If the IRS needs more information, you may receive CP562C with a specific list of items to send.
Can I claim credits with an ATIN?
You cannot claim the Earned Income Tax Credit with an ATIN. An SSN is required for EITC purposes. Other items on your return may still use the ATIN while the adoption is pending.
Where do I mail W‑7A if I am just starting the process?
Mail W‑7A and placement documentation to the IRS ATIN Unit at Stop 6182 in Austin, or visit a TAC that will forward your package. The ATIN status line is 737‑800‑5511 if it has been at least 8 weeks.
For CPA and EA Firms: Keep delivery tight during peak season
If you handle a high volume of adoption‑related filings, build a simple checklist that pairs each ATIN CP notice with the correct next step, the correct address, and the allowed reply method. Tie it to your practice management system so preparers cannot move work to review without attaching the right CP stub or upload confirmation. This protects turnaround and review time when your teams are stretched.
Accountably works with CPA and EA firms that need dependable offshore production without losing workflow control. In practice, that means SOP‑driven workpapers, layered review, clear SLAs, and continuity plans so Form 15101 updates, W‑7A mailings, and 15100 extensions do not get stuck in review loops during peak season. Use this kind of structure whether you run work in‑house or with a partner.
Final Checklist
- SSN issued by SSA, not the IRS.
- Form 15101 completed with parent info, child’s SSN and name, and prior ATIN.
- Any CP560 or CP561 notice stub included, if you received one.
- Submission sent by mail to Stop 6182, overnight to the Interregional Highway address, or uploaded or faxed only as instructed by your notice.
- Address changes made via Form 8822.
Compliance note: Addresses, notice instructions, and timelines in this guide were verified against IRS sources as of January 15, 2026. Always follow the instructions on your specific CP notice, especially for upload or fax details.
Sources and trust signals
- IRS Adoption Taxpayer Identification Number page for the roles of W‑7A, 15100, and 15101, plus the EITC SSN requirement and the ATIN status line.
- W‑7A instructions and the Internal Revenue Manual for the Austin Stop 6182 and the overnight street address.
- CP560 and CP561 notice pages that instruct taxpayers to use Form 15101 when an SSN is received, including upload and fax guidance.
- IRS Document Upload Tool overview, including its use for responding to notices.
- Form 8822 guidance for official address changes.