# SS-4 form: fill out and sign online, free

> Form SS-4 is the Internal Revenue Service's "Application for Employer Identification Number." In its words: "Form SS-4 is used by sole proprietors, corporations, partnerships, estates, trusts, and other entities to apply for an EIN." (IRS, About Form SS-4)

Page: https://pdfinish.com/forms/ss-4
Last updated: October 26, 2026

## SS-4 at a glance

- **Agency:** Internal Revenue Service (IRS)
- **What it is for:** Form SS-4 is used by sole proprietors, corporations, partnerships, estates, trusts, and other entities to apply for an EIN.
- **Who fills it:** Sole proprietors, corporations, partnerships, estates, trusts and other entities applying for an EIN, as the IRS describes it.
- **Who it goes to:** See the IRS instructions for Form SS-4.
- **Signature:** The form has a signature line at the bottom, after the statement that begins “Under penalties of perjury.”
- **Revision:** Rev. December 2025
- **Last checked:** October 26, 2026
- **Official form (PDF):** https://www.irs.gov/pub/irs-pdf/fss4.pdf
- **Official instructions:** https://www.irs.gov/instructions/iss4

## What the agency says

- The IRS offers an online EIN application. In its words: “Use this tool to get an EIN directly from the IRS in minutes for free.” (Source: [IRS, Apply for an EIN online](https://www.irs.gov/businesses/small-businesses-self-employed/apply-for-an-employer-identification-number-ein-online))

## How to fill it out

1. **Open the form.** Press Fill it now. The form opens in Finish PDF in your browser. Nothing is uploaded.
2. **Type in the boxes.** Click a box and type, or tick a checkbox. Add your signature in the Sign step and press Lock to put your entries into the page.
3. **Save your copy.** Name the file and download it. Your original blank form is never changed.

## Common questions

### Is the SS-4 form free to fill out here?

Free to start. Your 2 free uses in total need no account. Filling in a form and signing it are free; the file you download counts as one of your free uses. After that, start your 7-day free trial of Pro or buy Pro for $2.99 a month.

### Is my information uploaded?

No. The form is filled in your browser and never uploaded, so what you type, including any Social Security number or other tax ID, stays on your device. We do not record what you type.

### Is this the latest version of Form SS-4?

It is the version the agency listed as current when we last checked on 2026-10-26: Rev. December 2025. We compare our copy with the agency's every week. If the agency updates the form, this page says so and points to the official link until we update ours.

### Can I sign the SS-4 electronically?

Whether an electronic signature is accepted is up to whoever asked you for the form, unless the agency says otherwise. Check the agency's instructions at https://www.irs.gov/instructions/iss4. PDFinish places a picture of your signature on the page; it is not a certificate-based digital signature.

### Where do I send the SS-4?

In the agency's words: See the IRS instructions for Form SS-4. Read the agency's instructions at https://www.irs.gov/instructions/iss4.

### What do I put in each box of the SS-4?

We do not tell you what to enter. The agency's own instructions explain each line: https://www.irs.gov/instructions/iss4.

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Also searched as: SS4, SS-4, Form SS-4, SS4 form, EIN application, Application for Employer Identification Number.

PDFinish is not affiliated with the IRS or any government agency. The forms are the agency's own, unchanged. General information, not tax, legal or immigration advice.