What Form SS-4 is for
Form SS-4 establishes your Federal Employer Identification Number for tax purposes with the Internal Revenue Service. Business entities use it when completing IRS forms such as Form 941, Form 944, or an income tax return. The responsible party provides identifying details, including a Taxpayer Identification Number and line of business. The number supports banking needs, employment reporting, and other federal taxes.
When you’d use Form SS-4
Businesses use IRS Form SS-4 when creating a new business entity, hiring employees, or forming a single-member or multi-member LLC. The form applies when opening a business bank account, filing an employment-related quarterly federal tax return, or establishing certain retirement plans, including a Keogh plan. An amended filing occurs if your business structure changes in a way that requires a new EIN for tax purposes.
Key rules or details for 2019
- One EIN per responsible party per day: The Internal Revenue Service limits EIN Applications to one per responsible party per day, which helps prevent duplicate assignments. This protects accurate business tracking and reduces complications during tax filing.
- Responsible party must be an individual: The responsible party must be the ultimate majority owner who controls the business entity’s assets. This ensures proper IRS Requirements and accurate reporting for federal taxes.
- EIN stays with the legal entity: The Employer Identification Number stays with the business entity unless the structure changes. This stability supports consistent reporting for any income tax return or other IRS forms.
- The online EIN system requires a valid ID number: The online filing system requires a valid Social Security number or Taxpayer Identification Number to ensure identity verification during EIN Applications.
- Certain filings require an EIN: Forms including Form W-2, Form 8832, Form 1041, and Form 1042 require an EIN. This helps maintain proper classification and reporting under federal taxes for business entities.
- You cannot use an EIN as a personal ID: An EIN cannot replace a Social Security number for personal filings. This feature maintains accuracy for Medicare taxes and wage reporting.
- Business name rules apply: Doing Business As names must match IRS Requirements. Correct naming helps prevent IRS processing delays when updating records using forms such as Form 8822-B.
Browse more tax form instructions and filing guides in our Forms Hub.
Step-by-step (high level)
Step 1: Choose your application method
The Internal Revenue Service offers online, fax, mail, and phone options, depending on your location. Each method adheres to IRS Requirements and facilitates timely EIN assignment for tax purposes and business filings.
Step 2: Gather your information
You gather your legal name, Doing Business As name, business address, and articles of organization if forming an LLC. You also collect the responsible party information, the line of business details, and your expected Tax Identification Number.
Step 3: Complete Form SS-4 accurately
You enter your legal structure, employment expectations, and federal tax obligations. You also confirm whether your business entity requires filing Form 941, Form 944, or other IRS forms for tax purposes.
Step 4: Submit the completed form
You submit the form using your chosen method, ensuring the Internal Revenue Service receives accurate information. This enables the prompt assignment of your Federal Employer Identification Number for business operations and tax reporting purposes.
Step 5: Begin using your EIN
You use the assigned number for bank accounts, hiring employees, and filing taxes. You also include it on wage and tax statement documents and any quarterly federal tax return submissions.
Learn more about federal tax filing through our IRS Form Help Center.
Common mistakes and how to avoid them
- Incorrect responsible party information: You can avoid problems by confirming the accountable party’s Social Security number or Taxpayer Identification Number matches IRS records, which supports accurate EIN Applications. You verify the entry before submitting the form.
- Using the wrong business name: You can prevent delays by ensuring the legal name and Doing Business As name match the formation documents, which ensures proper IRS form processing. You review your records before filing.
- Applying multiple times: You can avoid duplicate EINs by submitting only one Form SS-4 per business entity, which reduces confusion for federal taxes. You wait for an IRS response before resubmitting.
- Leaving key fields blank: You can prevent processing issues by completing all questions, including line of business and employment expectations, which ensures accurate classification for tax purposes. You check the form carefully before mailing or faxing.
- Misunderstanding when a new EIN is required: You can avoid unnecessary filings by confirming whether a structural change requires a new number, which maintains correct IRS records. You review IRS Requirements when changing your business entity.
Learn more about how to avoid business tax problems in our guide on How to File and Avoid Penalties.
What happens after you file
The Internal Revenue Service issues an EIN immediately for online applications or within several days for fax submissions. Mail applications require several weeks. Once assigned, you use the number for tax filing, hiring employees, wage and tax statement reporting, or opening bank accounts. You update ownership or address changes using Form 8822-B as needed.
FAQs
Do I need an EIN for a Sole Proprietorship?
You need an EIN if you hire employees, file employment-related IRS forms, or open certain business bank accounts.
Does a single-member LLC always need an EIN?
A single-member LLC is required to obtain an EIN when hiring employees or filing employment-related federal taxes.
When does a business require a new EIN?
A new EIN is required when your legal structure changes, such as when forming a multi-member LLC or corporation.
Can I change my address after filing Form SS-4?
You can update your address by filing Form 8822-B with the Internal Revenue Service.
Can non-profit organizations apply using Form SS-4?
Yes, non-profit organizations use Form SS-4 to obtain an EIN for tax purposes.
Does Form SS-4 apply to joint ventures?
Joint ventures use Form SS-4 when forming an entity that needs a tax ID number for federal filings.
Can I use an EIN for personal tax filing?
No, personal filings require a Social Security number and not an Employer Identification Number.
