EIN for Your Colorado LLC — How to Apply and Why You Need One

An Employer Identification Number (EIN) is your Colorado LLC's federal tax identification number, issued free by the IRS. While not technically part of the Colorado formation process (it's a federal requirement), it's essential for operating your LLC in Colorado — from opening a business bank account at a Colorado bank to registering with the Colorado Department of Revenue.

What Is an EIN?

An EIN (also called a Federal Tax Identification Number or FEIN) is a 9-digit number (XX-XXXXXXX format) that identifies your LLC for federal tax purposes. Think of it as a Social Security Number for your business.

Why Your Colorado LLC Needs an EIN

Required by law if:

• Your LLC has more than one member (multi-member LLCs must have an EIN)
• Your LLC has employees in Colorado
• Your LLC elects S-corp or C-corp taxation

Practically required for:

• Opening a business bank account — Colorado banks (FirstBank, U.S. Bank, Alpine Bank, etc.) all require an EIN for LLC accounts
• Registering with the Colorado Department of Revenue for sales tax collection
• Filing your Colorado income tax return (DR 0106 for partnerships or Colorado S-corp returns)
• Applying for a Colorado sales tax license (Colorado Sales Tax Account through MyBizColorado)
• Establishing credit in your LLC's name
• Invoicing clients (many clients require your EIN for their own 1099 reporting)

How to Apply for an EIN (Free)

Online application (fastest — recommended):

1. Go to irs.gov (search "EIN application" or navigate to the EIN Assistant)
2. Select "Limited Liability Company" as entity type
3. Select the number of members
4. Select your LLC's tax classification (disregarded entity, partnership, S-corp, or C-corp)
5. Enter your LLC name exactly as filed with the Colorado Secretary of State
6. Enter your LLC's Colorado address
7. Enter the responsible party's name and SSN/ITIN
8. Complete and submit
9. Receive your EIN immediately — it's issued on-screen and via confirmation letter

Availability: Monday-Friday, 7:00am-10:00pm Eastern Time

By mail (Form SS-4):

• Mail completed Form SS-4 to the IRS
• Processing time: 4-5 weeks
• Only necessary if you don't have a SSN/ITIN (international applicants)

When to Apply

Apply for your EIN after your Articles of Organization have been filed with the Colorado Secretary of State. You'll need:

• Your LLC's exact legal name (as filed)
• The state of organization (Colorado)
• Date of formation
• Your principal business address in Colorado

You can apply the same day your LLC is approved — you don't need to wait for any additional confirmation from the Colorado SOS.

The "Responsible Party"

The IRS requires a "responsible party" for every EIN application — this is the person who controls or manages the LLC's finances. For most Colorado LLCs:

• Single-member LLC: You
• Multi-member LLC: The managing member or designated manager
• Manager-managed LLC: The manager

The responsible party must have a valid SSN or ITIN.

EIN and Colorado State Registration

After getting your EIN, you'll use it for several Colorado-specific registrations:

• Colorado Department of Revenue: Use your EIN when registering for a Sales Tax Account (if selling taxable goods/services)
• Colorado unemployment insurance: Required if hiring employees (register through CDLE — Colorado Department of Labor and Employment)
• Colorado withholding tax: If you have employees, register for state withholding using your EIN through the Colorado Department of Revenue

FAQ

Does an EIN cost money?

No. The IRS issues EINs free of charge. Any website offering to "apply for your EIN" for a fee is a third-party service — not the IRS. Go directly to irs.gov for free application.

Can I use my SSN instead of an EIN?

Only single-member LLCs with no employees technically can. However, using your SSN for business means giving your personal identifier to every client, vendor, and bank. An EIN protects your privacy and is required for Colorado DOR registration.

How long does it take to get an EIN?

Instantly for online applications (during IRS business hours). The number is issued on-screen the moment you complete the application. You can use it immediately to open a bank account.

Can I apply for an EIN before my LLC is formed?

Technically the IRS allows it, but it's better to wait until your Articles of Organization are approved by the Colorado Secretary of State. If your LLC name changes during formation, you'll need a new EIN.

What if I already have an EIN from a previous business?

You cannot reuse an EIN. Each legal entity gets its own unique EIN. Your Colorado LLC needs its own, separate from any previous business.

Do I need a separate EIN if I elect S-corp taxation?

No. Your LLC keeps the same EIN regardless of tax election changes. The EIN follows the entity, not the tax classification.