Mailing and fax details
Standard delivery ("Entrega estándar") and next-day delivery ("Entrega al día siguiente") addresses in Austin, TX, a fax number, and a phone number for questions.
15100
Adoption Taxpayer Identification Number (ATIN) Extension Request (Spanish Version)
- Agency
- IRS
- Revision
- Rev. 10-2017
- Fillable fields
- 36
- Pages
- 1
- Official source
- IRS form page
- Checked
- October 21, 2026
Form 15100 (sp): ATIN Extension Request for Adoptive Parents, Spanish Version
Form 15100 (sp) is the Spanish version of Form 15100, Adoption Taxpayer Identification Number (ATIN) Extension Request. Its Spanish title is "Solicitud de prórroga del Número de identificación del contribuyente en proceso de adopción (ATIN)". The fields and directions are in Spanish. The header "Department of the Treasury - Internal Revenue Service" and the footer are in English.
It is a one-page form for adoptive parents ("padres adoptivos") who have an ATIN for an adopted child. They check one of three circumstances: they received a Social Security number for the child, they need a one-year extension of the ATIN, or they could not get a Social Security number for the child. The form also asks for contact details, whether the adoption is final or pending, and the parents' original signatures.
The top of the form says to complete it and send it to the IRS by mail or fax, with addresses in Austin, Texas. No separate instructions are printed or linked. You can fill out the PDF free in your browser on this page and download it without an account.
What's on Form 15100 (sp)
Contact information
Two lines for a name and taxpayer identification number, a new address if it changed, and primary and secondary phone numbers with the best time to call, a.m. or p.m.
Circumstances
"Indique cuál de las siguientes circunstancias le corresponde": three boxes, each with the adopted child's name and the SSN or ATIN assigned.
Reason fields
A "Razón" space under the extension box and under the box for not getting an SSN.
Adoption status
"Estado de la adopción": boxes for final ("La adopción es definitiva") or pending ("La adopción está pendiente"), and a line stating that documents signed by the agent or child placement agency are attached.
Signatures
Name typed or printed, signature and date for each adoptive parent.
The labels are in Spanish. The items below give their English meaning.
How to fill out Form 15100 (sp)
- 1
Contact information
Enter each name with its taxpayer identification number. The form says to write a new address only if the address changed, then add phone numbers and the best time to call.
- 2
Choose one circumstance
Check the box that applies and enter the adopted child's name.
- 3
Enter the number
For an SSN received, write the Social Security number assigned. For an extension, or when no SSN was obtained, enter the ATIN assigned.
- 4
Give the reason
Write the reason in the "Razón" space under the box that was checked, when that box has one.
- 5
Adoption status
Check final or pending. The next line says documents signed by the agent or child placement agency are attached.
- 6
Sign
Each adoptive parent types or prints a name, signs with an original signature and adds the date.
Why fill Form 15100 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
Where to send it and contact details
Standard delivery
The form lists Internal Revenue Service, Stop 6182, Austin, TX 73301-0066.
Next-day delivery
The form lists Internal Revenue Service, 3651 S. Interregional Hwy 35, Stop 6182, Austin, TX 78741.
Fax
The form lists fax number (855) 250-1731.
Questions
The form gives (737) 800-5511 and says it is not a toll-free number.
No deadline printed
The form prints no deadline and no processing time.
Related forms
Who files Form 15100 (sp)?
The form is completed and signed by the adoptive parents and goes to the IRS. Each circumstance line names the adopted child ("hijo adoptado").
Official sources and the blank
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Questions about Form 15100
What language is Form 15100 (sp) in?
The title, directions and field labels are in Spanish. The header and the footer "Form 15100 (sp) (Rev. 10-2017)" are in English. The English edition is Form 15100.
What does Form 15100 (sp) ask?
Which of three circumstances applies to the adopted child's ATIN: an SSN was received, a one-year extension is needed, or an SSN could not be obtained.
Where is it sent?
By mail or fax. Standard delivery goes to Internal Revenue Service, Stop 6182, Austin, TX 73301-0066, and the fax number is (855) 250-1731.
Who signs it?
The adoptive parents, with original signatures, printed names and dates.
Is there a phone number for questions?
The form lists (737) 800-5511 and says it is not toll free.