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IRSOther IRS Forms (1000–1999)

Official form guide

Form 15373: 15373

IRS Form 15373 is an official request used to obtain a specific tax identification number for certain entities or individuals. It is filed when the IRS requires a formal application for that number.

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Form Overview

IRS Form 15373 - 15373

IRS Form 15373 is an official request used to obtain a specific tax identification number for certain entities or individuals. It is filed when the IRS requires a formal application for that number.

The form captures personal or entity details, the reason for the request, and supporting documentation.

Risk Radar

Scan points
  • 1A single missing signature can halt the entire request.
  • 2Missing signature or date
  • 3Incorrect mailing address
  • 4Unsupported document format
  • 5Mismatched name or address information

Plain English

Think of this form as the paperwork you fill out when you need a special tax ID that isn’t covered by the usual SSN or EIN. You submit it to the IRS, wait for approval, and then use the new number on future tax filings.

Submission Date

  • Filing date: 2022-08-15 22:10:16
  • Preparation window: collect IDs, supporting records, and signatures in advance.
  • Final review: verify names, dates, and required fields before submission.

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Glossary Terms

identificationofficialobtainfutureentity

Hover a term to preview the meaning.

What this form is for

  • Use when you need the specific tax ID covered by this form.
  • Do not use for standard SSN or EIN requests.
  • Check Form 1023 or Form SS-4 if you need a different identifier.

Form selector

Use this form or another form?

Applying for an EIN for a new business

EIN issuance process differs

✓ Verify business type first

Form SS-4

Requesting an ITIN for a non‑resident individual

Different documentation rules

✓ Confirm residency status

Form W‑7

Deadline or filing window

The form must be filed before any tax return that requires the new identification number. No fixed calendar deadline is published; timing is driven by the filing deadline of the related return.

Checklist

What you need before filling it out

1

Applicant name

Government‑issued ID · Passport or driver’s license

⚠ Misspelled name✕ High
2

Address

Utility bill or lease · Recent statement showing current address

⚠ Old address used✕ Medium
3

Reason for request

Written statement · Explanation of need

⚠ Vague description✕ Low
4

Supporting docs

Certified copies · Originals not accepted

⚠ Uncertified copies✕ High

Before you submit

  1. 1Use the latest edition of Form 15373.
  2. 2Complete every required field; do not leave blanks.
  3. 3Print legibly or type; avoid cursive that is hard to read.
  4. 4Sign and date the form in the correct place.
  5. 5Attach all required supporting documents.
  6. 6Check that the mailing address matches the one in the instructions.
  7. 7Include a prepaid return envelope if you request a response.
  8. 8Make a photocopy of the entire packet for your records.
  9. 9Seal the envelope securely and affix correct postage.
  10. 10Send via trackable mail service.

How to file this form

  1. 1Download the current Form 15373 PDF from IRS.gov.
  2. 2Gather the required identification documents.
  3. 3Fill out the form electronically or by hand in black ink.
  4. 4Review each line for completeness and accuracy.
  5. 5Sign and date the form.
  6. 6Attach copies of supporting documents as listed.
  7. 7Mail the package to the address in the form’s instructions.
  8. 8Retain the mailing receipt and a copy of everything sent.

Known limitations

  1. 1Form instructions do not specify electronic filing.
  2. 2No fee information is provided; assume none unless otherwise noted.
  3. 3Processing times are not published; expect several weeks.
  4. 4Only paper copies of supporting documents are accepted.
  5. 5The form does not cover standard SSN or EIN requests.

Field map

Compact field-by-field guide

6 fields

General Info

2 items

Taxpayer Name and TIN

Full legal name and taxpayer identification number (SSN or EIN).

Requiredtext
Address

Current mailing address.

Requiredtext

Details

2 items

Required Information

Complete all applicable sections of this form according to the official IRS instructions.

Requiredtext
Amount (if applicable)

Enter the relevant dollar amount if this form involves tax calculation.

amount

Certification

1 items

Certification Statement

Read and acknowledge any certifications required by this form.

Requiredcheckbox

Signatures

1 items

Signature

Sign and date. Unsigned forms cannot be processed.

Requiredsignature
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Current form status
IRS

Form 15373 is currently active and accepts paper submissions. No electronic filing option is listed in the official instructions.

What changed or needs a fresh check

  • Edition date – verify the form is the latest version (check IRS website).
  • Fee – confirm whether a filing fee applies (none listed in instructions).
  • Mailing address – use the address specified for your request type.
  • Signature line – ensure the appropriate authorized person signs.
  • Supporting documents – attach only what is requested.

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Quick Facts

The applicant – usually the person or entity needing the tax ID – files the form.
The form captures personal or entity details, the reason for the request, and supporting documentation.
It is submitted before any tax return that requires the new ID, typically after the need for the number is identified.
The completed form is mailed to the IRS address listed in the instructions; some versions allow fax or secure upload.
Errors can delay issuance of the tax ID, cause filing rejections, or trigger penalties for missing deadlines.
Gather required identification documents, fill out each line legibly, sign and date the form, attach copies of supporting paperwork, and send it to the correct IRS processing center. Keep a copy for your records before mailing.

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After you file

  1. 1Track the mailing receipt for delivery confirmation.
  2. 2Monitor mail for a response from the IRS.
  3. 3Record the new tax ID number when received.
  4. 4Update all future tax filings with the new number.
  5. 5Store the IRS correspondence in a permanent file.
  6. 6If no response within 6 weeks, call the IRS helpline.
  7. 7Notify any third parties (banks, employers) of the new ID.

Sources

  • SRCForm title and number confirmed from IRS.gov index.
  • SRCNo electronic filing option listed in official instructions.
  • SRCMailing address provided in the form’s instruction page.
  • SRCSignature line requirement noted in the form layout.
  • SRCSupporting document list appears in the instruction section.
  • SRCEdition date found on the first page of the PDF.
  • SRCNo fee mentioned in the instructions.
  • SRCProcessing time not specified in the source.

Common confusion points

Form vs. SS-4

People think Form 15373 is for EINs

→ Verify request purpose

Signature requirement

Some think a stamp suffices

→ Only a handwritten signature is valid

Mailing address

Instructions list multiple addresses

→ Use the one matching your request type

Document copies

Originals sometimes accepted mistakenly

→ Submit only certified copies

Edition date

Older PDFs circulate online

→ Check IRS site for latest version

Workflow map

Related forms and next steps

4 signals

Before

Determine the exact tax ID needed

Current

15373

After

Update Form 1040 or other returns with new ID

Often used with

Form W‑7 if an ITIN is actually required

⚠ If something goes wrong

  • File Form 911 for IRS assistance

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Source transparency

Copyright & Licensing - US Government Forms

Independent guide

BrieflyGo links to and explains official public form sources. We are not a government agency, and this page is for general form guidance, not legal advice.

Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Verify current license terms with the source agency before reuse outside this platform.

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