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Official form guide
Form 15100: Adoption Taxpayer Identification Number (ATIN) Extension Request
Internal Revenue Service Form 15100 is the Adoption Taxpayer Identification Number (ATIN) Extension Request that adoptive parents use to ask the IRS for a one‑year extension when they cannot obtain a social security number for the adoptee. The form collects contact info, adoption status, and requires signatures.
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IRS Form 15100 - Adoption Taxpayer Identification Number (ATIN) Extension Request
Internal Revenue Service Form 15100 is the Adoption Taxpayer Identification Number (ATIN) Extension Request that adoptive parents use to ask the IRS for a one‑year extension when they cannot obtain a social security number for the adoptee. The form collects contact info, adoption status, and requires signatures.
Risk Radar
Scan points- 1Omitting the adoptive parents’ signatures invalidates the request.
- 2Leaving the address line blank in the Contact Information section.
- 3Failing to provide a primary telephone number.
- 4Not indicating whether a Social Security number has been received for the adoptee.
- 5Omitting the reason for requesting a one‑year ATIN extension.
Plain English
Form 15100 lets adoptive parents ask the IRS for an extra year to get an ATIN for a child they are adopting. They provide their contact details, explain why a Social Security number isn’t available, state the adoption’s status, and sign the form before mailing or faxing it.
Submission Date
- Filing date: 2017-10-25 18:00:17
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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What this form is for
- Use this form when you need a one‑year extension for an Adoption Taxpayer Identification Number because the adoptee does not have a Social Security number.
- Do not use it when the adoptee already has an assigned Social Security number.
Form selector
Use this form or another form?
ATIN extension needed due to missing SSN
Extension request required to maintain ATIN validity
✓ Verify the adoptee lacks an SSN before filing
Adoption pending and ATIN required for tax filing
Pending adoption status still needs ATIN
✓ Ensure adoption status is correctly indicated
Placement agency documents must be submitted with extension request
Agency‑signed documents support the extension
✓ Confirm all agency signatures are attached
Deadline or filing window
Not stated in the official source.
Checklist
What you need before filling it out
Contact Information section
Name, Taxpayer Identification Number, address, phone numbers · Form fields on page 1
ATIN extension circumstance
Reason for needing extension and ATIN (if assigned) · Circumstance checkboxes on page 1
Adoption status selection
Indication of final or pending adoption · Adoption status options on page 1
Original signatures of adoptive parents
Printed name, signature, date for each parent · Signature lines on page 1
Placement agency documents
Signed documents from placement agency or agent · Enclosure statement on page 1
Before you submit
- 1Enter the full legal name of the filer in the Name field.
- 2Enter the filer’s Taxpayer Identification Number accurately.
- 3Provide the complete mailing address, including city, state, and ZIP code.
- 4Supply both primary and secondary telephone numbers with preferred call times.
- 5Check the box indicating you need a one‑year ATIN extension.
- 6Enter the adoptee’s name and, if assigned, the ATIN in the appropriate line.
- 7State the reason why a Social Security number could not be obtained.
- 8Select either “My adoption is final” or “My adoption is pending” as applicable.
- 9Sign and date the form for each adoptive parent.
How to file this form
- 1Complete all contact information fields with accurate details.
- 2Mark the appropriate circumstance and provide the adoptee’s name and ATIN reason.
- 3Select the correct adoption status and indicate any accompanying agency documents.
- 4Obtain original signatures and dates from both adoptive parents.
- 5Mail or fax the signed form to the IRS address or fax number and keep a copy as proof of filing.
Known limitations
- 1The form requests only a one‑year ATIN extension; longer extensions are not permitted.
- 2The form is not used when the adoptee already has a Social Security number; a separate SSN application is required.
- 3The form applies to adoptive parents requesting an ATIN extension; other parties are not covered.
Field map
Compact field-by-field guide
General Info
2 items
Full legal name and taxpayer identification number (SSN or EIN).
Current mailing address.
Details
2 items
Complete all applicable sections of this form according to the official IRS instructions.
Enter the relevant dollar amount if this form involves tax calculation.
Certification
1 items
Read and acknowledge any certifications required by this form.
Signatures
1 items
Sign and date. Unsigned forms cannot be processed.
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Fillable formOpen in Editor->Form 15100 is the October 2017 revision (Rev. 10‑2017). The source does not reference a newer edition or a “latest information” page.
What changed or needs a fresh check
- Edition date — confirm the revision reads Rev. 10‑2017 (October 2017) as shown on the form.
- Fee — not stated in the official source
- Mailing address — confirm the standard mailing address is Internal Revenue Service Stop 6182 Austin, TX 73301‑0066
- Signature — confirm original signatures of both adoptive parents are provided with printed names and dates
Quick Facts
Downloads
After you file
- 1Retain the completed Form 15100 and any supporting documents for at least three years.
- 2Keep a copy of the fax or mailed receipt confirming IRS receipt.
- 3Await written confirmation from the IRS; processing may take several weeks.
- 4If the IRS returns the form with errors, correct the indicated fields and resend by fax or mail.
Sources
- SRCForm p.1 — provides the form title and revision date (October 2017).
- SRCForm p.1 — lists the Standard mailing address (Internal Revenue Service Stop 6182 Austin, TX 73301-0066).
- SRCForm p.1 — lists the Overnight mailing address (Internal Revenue Service 3651 S. Interregional Hwy 35 Stop 6182 Austin, TX 78741).
- SRCForm p.1 — provides the fax number (855) 250-1731.
- SRCForm p.1 — provides the contact phone number (737) 800-5511 (not toll free).
- SRCForm p.1 — includes the option ‘I need a 1 year extension for (Name of adoptee)’.
- SRCForm p.1 — includes the option ‘I received a social security number for (Name of adoptee)’.
- SRCForm p.1 — includes fields for adoption status: ‘My adoption is final’ and ‘My adoption is pending’.
- SRCForm p.1 — requires original signatures of adoptive parents with printed name, signature, and date.
Common confusion points
Do I need to fill out the form if I already have an SSN for my child?
The form includes an option for indicating a received SSN, which is for cases where the SSN is already assigned.
→ Confirm the SSN field is filled and select the ‘I received a social security number’ option.
Can I request a two‑year extension?
The form only lists a 1‑year extension option.
→ Select the one‑year extension box; longer extensions require a different process.
Where should I send the completed form?
The address block lists two mailing options and a fax number.
→ Use the ‘Standard’ address for regular mail or the fax number (855‑250‑1731) for fax submission.
What phone number do I call for questions?
The contact section provides a non‑toll‑free number.
→ Call (737) 800‑5511 as listed.
Do I need to include the placement agency’s signature?
The form states ‘I am enclosing documents the placement agency or agent signed’.
→ Attach the signed placement‑agency documents before sending.
Which adoption status should I select?
The form offers ‘final’ and ‘pending’ options without further guidance.
→ Choose the status that matches the legal state of your adoption at the time of filing.
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- Form 15100 (re‑file) – submit a corrected ATIN extension request if the IRS returns the original with errors.
Questions about IRS Form 15100
What is IRS Form 15100 used for?
Form 15100 lets adoptive parents ask the IRS for an extra year to get an ATIN for a child they are adopting. They provide their contact details, explain why a Social Security number isn’t available, state the adoption’s status, and sign the form before mailing or faxing it.
Who must file IRS Form 15100?
Adoptive parents who need an ATIN extension for their adoptee.
What information does IRS Form 15100 require?
The form collects the parents’ names, taxpayer identification numbers, address, telephone numbers, whether a Social Security number has been issued for the child, the reason for a one‑year extension, the adoption’s status (final or pending), and the parents’ signatures.
Where do I file IRS Form 15100?
Send the completed form by standard mail to Internal Revenue Service, Stop 6182, Austin, TX 73301‑0066, by overnight mail to Internal Revenue Service, 3651 S. Interregional Hwy 35, Stop 6182, Austin, TX 78741, or fax to (855) 250‑1731.
How do I complete IRS Form 15100?
Begin by entering the parents’ names, taxpayer identification numbers, address, and phone numbers in the Contact Information section. Next, indicate whether a Social Security number has been received, request a one‑year extension, or explain why a number cannot be obtained, and select the adoption’s status. Provide any required ATIN numbers and reasons, then have both adoptive parents sign and date the form. Finally, mail, overnight ship, or fax the form to the IRS address listed.
Do I need to fill out the form if I already have an SSN for my child?
The form includes an option for indicating a received SSN, which is for cases where the SSN is already assigned. Confirm the SSN field is filled and select the ‘I received a social security number’ option.
Can I request a two‑year extension?
The form only lists a 1‑year extension option. Select the one‑year extension box; longer extensions require a different process.
Where should I send the completed form?
The address block lists two mailing options and a fax number. Use the ‘Standard’ address for regular mail or the fax number (855‑250‑1731) for fax submission.
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