Every U.S. individual and business needs a unique identifier to meet tax reporting obligations and open financial accounts. This number is assigned by the Internal Revenue Service and used by federal agencies, banks, and employers.
Obtaining this identifier is straightforward when you follow the official steps and provide accurate information. The process differs slightly depending on whether you apply as an individual, a business, or a representative acting on behalf of another entity.
| Who Needs It | Primary Use | Issuing Authority | Typical Timeline |
|---|---|---|---|
| Individual U.S. citizen or resident | File tax returns and receive benefits | Internal Revenue Service | Immediate if applied online or by phone |
| Business entity | Hire employees, open bank accounts, file returns | Internal Revenue Service | Immediate for online applications, up to two weeks by mail |
| Nonresident alien | Tax reporting and withholding | Internal Revenue Service | Varies based on documentation and processing |
| Estate or trust | File fiduciary returns and manage assets | Internal Revenue Service | Typically a few weeks for mail applications |
Determine Your Eligibility and Entity Type
Before you begin, confirm that you are eligible for this number based on your tax status. U.S. citizens, resident aliens, and nonresident aliens required to file taxes can all receive an identifier.
Different entity types follow distinct application rules. Sole proprietors, partnerships, corporations, and estates each have guidance on the form used and supporting documentation needed.
Understanding your entity type helps you complete the correct fields and avoid delays caused by mismatched information or missing signatures.
Complete Form SS-4 Accurately
Fill out Form SS-4 with precise legal names, addresses, and entity classification. Mistakes on this form are a common reason for processing delays or requests for clarification.
Double-check the Responsible Party section, as this person will be legally accountable for the tax obligations tied to the identifier. Ensure titles, dates of birth, and social security numbers align with government records.
Review the purpose section and provide a clear reason, such as employment, mortgage lending, or business formation, so the application matches supporting documents.
Choose the Right Application Method
You can apply online through the IRS website, by phone, by fax, or by mail. Each channel has its own documentation requirements and processing times.
Online and phone applications typically provide immediate issuance for eligible applicants, while mail applications may take several business days to complete review.
International applicants and those with complex entity structures may need to use mail or fax to submit additional verification materials securely.
Gather Required Supporting Documents
Be prepared to submit proof of identity, citizenship or residency, and authority to apply on behalf of the entity. Acceptance criteria vary by application channel and individual circumstances.
For businesses, this may include formation documents, partnership agreements, or corporate bylaws. For individuals, it often involves presenting a driver’s license or other government-issued photo ID.
Electronic submissions may require scanned copies or digital signatures, while paper applications should include certified original or certified copies as specified.
Key Steps and Recommendations
- Confirm your eligibility based on citizenship, residency, or business status.
- Select the correct form and entity type before filling out any personal information.
- Complete Form SS-4 with accurate legal names, addresses, and contact details.
- Choose the fastest eligible application method, such as online or phone, when possible.
- Gather supporting documents that verify identity, authority, and tax obligations.
- Review the application carefully to reduce delays and avoid corrections.
- Keep a copy of the submitted form and any confirmation numbers for your records.
- Use the identifier only for authorized tax and financial purposes.
FAQ
Reader questions
Can I apply for this identifier if I am not a U.S. citizen?
Yes, noncitizens who have federal tax reporting obligations, including nonresident aliens and resident aliens, are eligible to apply and receive this number.
What happens if I enter incorrect information on the application?
Errors can delay processing or require you to submit a corrected application, so verify names, addresses, and entity details before you submit.
Is there a fee to obtain this identifier from the IRS?
No, the Internal Revenue Service does not charge a fee for issuing this identifier to individuals, businesses, estates, or trusts.
How quickly can I use the number after receiving it?
Once issued, you can use it immediately for tax filing, banking, or employment purposes, though some institutions may require additional validation steps.