Illinois Tax ID (EIN) Number Application Guide

Looking to obtain your Tax ID (EIN) Number in Illinois? This short Illinois Tax ID Application Guide will walk you through the basic steps you need to follow to apply for your Tax ID (EIN) Number in the state of Illinois. Whether you own a Partnership, multi-member limited liability company, Corporation, Non-Profit, Trust or Estate, this guide will help you learn what you need to know to obtain an official Tax ID Number within minutes.

Steps to Obtain your Tax ID (EIN) Number in Illinois:

  1. Prepare Required Information
  2. Apply for a Illinois Tax ID Online
  3. Apply for a Illinois Tax ID by Phone, Mail or Fax
  4. What Is the Illinois State Identification Number?
  5. What Is an Illinois IDOR Number?
  6. How Do I Get an Illinois State Tax ID Number?

1. Prepare Required Information

Your first step should be preparing all the information required of you when you fill out the application. When applying for a tax ID, you’ll need to provide several details about your business. Rather than hunting them down in the middle of the process, it’s better to get them in advance. That way, you can fill out the application faster.

Obtain the following:

  • Legal names and addresses. First, get the full legal names and legal addresses of all your business’s founding members, including yourself and any partners you have.
  • Social security numbers (SSNs). You’ll also need to have their social security numbers (SSNs).
  • Your legal business name. You’ll also need to have your legal business name in place to complete the EIN application.

2. Apply for a Illinois Tax ID Online

If you need to get a tax ID, you have a few different methods available to you. There is, however, one method that’s objectively better than the others: applying online.

Applying online is faster, more convenient, and ultimately more beneficial for practically all businesses. Because the application is available online, you can access it using any internet-connected device. That makes it much more convenient than traditional methods, which require more intensive steps. Assuming you have all the right details prepared, filling out the application should be fast and intuitive; most people can complete the application in 5 minutes or less.

Once the application is completed, you’ll experience the best benefit of applying online: the turnaround time. You should receive your tax ID via email less than an hour after you finish the application, which means you can get your business started faster, and start generating revenue.


3. Apply for a Illinois Tax ID by Phone, Mail or Fax

Even though applying online is universally better, it is possible to apply for your tax ID through one of several traditional methods. Paper applications are no longer efficient, but they are available. If you choose to obtain and fill out a paper application by hand, you can mail or fax it in. If you want to talk through the application questions with someone over the phone, you can do that (as long as you’re available during business hours). However, there’s a major downside to pursuing any of these methods. Typically, it takes 4 to 6 weeks to receive your tax ID when you use them.

4. What Is the Illinois State Identification Number?

If you’re starting a business in Illinois, you may need to get an Illinois state identification number. If you’re trying to get a federal tax ID number, it’s easy to get confused about what you do or don’t need. Your federal tax ID number, sometimes referred to simply as your “tax ID” number, is a nine-digit identifying number provided to you when you register your business with the federal government. This is also called your employer identification number, or EIN.

Your Illinois state identification number is provided by the Illinois department of revenue, or IDOR, registering your business with the state of Illinois. Like your federal tax ID number, this serves as a unique identifier, but it’s used for entirely different purposes. You’ll need an Illinois state identification number if you’re going to hire employees in the state of Illinois, or if you’re going to sell taxable goods and services in the state. You’ll also need one if you’re going to owe excise taxes on regulated goods, like alcohol or tobacco.

5. What Is an Illinois IDOR Number?

To put it simply, your Illinois IDOR number is just another name for your Illinois state tax ID number. You may also encounter this number being referred to as your sales tax number or sales tax ID. As the alternative name suggests, this number is important for state sales tax purposes, and you’ll need one if you’re going to sell taxable goods and services in the state of Illinois. You’ll also need one if you’re going to hire employees in the state of Illinois.

Remember that this number is similar to, but distinct from your federal tax ID, also called an EIN. You’ll need a federal tax ID number if you’re going to hire any employees or if your business will have multiple members. You may also need this number if you plan on opening a business bank account or if you’re going to get a business loan. Federal tax ID numbers are also required for the vast majority of business license, permit, and certification applications.

6. How Do I Get an Illinois State Tax ID Number?

Your Illinois business will likely be required to have both a federal tax ID and an Illinois state tax ID number to operate legally in the state of Illinois. If you’re looking to get your Illinois state tax ID number, the first step is to obtain your federal tax ID number, which you should get through an online application so you can receive it via email in less than an hour.

After you have your federal tax ID, you can apply for an Illinois state tax ID number. Again, you’ll have multiple application options, but it’s far faster and more convenient to apply online. You’ll answer similar questions about your business and its founding partners no matter which format you use. Although applying online is faster and more efficient, getting your state tax ID will take longer than getting your federal tax ID; in many cases, it will take 4 to 6 weeks.