> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.lineagecrm.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How to get an EIN

## What is an EIN?

An **EIN (Employer Identification Number)** is a free, 9-digit tax ID issued by the IRS to identify a business — similar to a Social Security Number, but for your business. It looks like this: `12-3456789`.

If you're operating as a sole proprietor, LLC, S-corp, or any other business entity, you can get one for free in about 15 minutes. You do not need employees to qualify.

---

## Why Lineage needs your EIN

10DLC registration requires a verified business EIN. Mobile carriers use it to confirm your business identity before approving your phone numbers for outbound calling and SMS. Without a verified EIN, your numbers cannot be registered.

---

## How to get your EIN

Getting an EIN is **free** and takes about **15 minutes** on the IRS website. Your EIN is issued immediately at the end of the application — you do not have to wait.

1. Go to the [IRS EIN Online Application](https://sa.www4.irs.gov/applyein/) and click **Apply Online Now**
2. Select your business structure (sole proprietor, LLC, etc.)
3. Enter your business name, address, and basic details
4. Submit — your EIN typically appears on screen immediately

> **Heads up:** The IRS online application is available Monday–Friday, 7 a.m. to 10 p.m. Eastern Time. It is not available on weekends or federal holidays.

---

## Using your EIN confirmation letter (IRS Notice CP 575)

After you apply, the IRS will mail you **IRS Notice CP 575** — your official EIN confirmation. This notice shows your business name and address **exactly as the IRS has them on file**.

When filling out your 10DLC application in Lineage, use the **name and address from your CP 575** — not a DBA name, not a nickname, and not an old address. Even minor differences (like "LLC" vs. "L.L.C.") can cause your application to be rejected by the carrier registry.

---

## Already have an EIN but lost your CP 575?

Call the IRS Business & Specialty Tax Line at **1-800-829-4933** (Monday–Friday, 7 a.m. to 7 p.m. local time) and ask for a **147C letter**. This is the IRS's official EIN verification letter and serves the same purpose as the CP 575 for 10DLC registration.

---

## Need help?
* **C**ontact Lineage Support and we'll be happy to assist.