What Is the EIN Field on Form 1120? Employer Identification Number Explained
Key Takeaways
- The EIN is a nine-digit number (XX-XXXXXXX) at the top right of Form 1120
- Your EIN is on your CP 575 or 147C letter
- EINs are permanent and do not expire
The EIN Field on Form 1120
The EIN (Employer Identification Number) field is at the top right of Form 1120 Page 1. This nine-digit number (XX-XXXXXXX) identifies your LLC with the IRS across all filings, payments, and correspondence.
Why the EIN Is Critical
Filing with the wrong EIN — or without one — will cause your return to be rejected or misprocessed. For foreign-owned single-member LLCs, the EIN is obtained by filing Form SS-4 by fax or mail.
Your EIN Is Permanent
Once assigned, your EIN does not expire or change. Use the same EIN for every filing. Find it on your CP 575 confirmation letter or request a 147C verification letter.
IRS Form 1120 Instructions
Official IRS source on irs.gov
Listen on Spotify
Money & Tax Talk with Rippa — 5/5 rating
Watch on YouTube
ForeignLLCTax — 187 videos
File Your LLC Taxes Now
Generate your IRS Form 5472 + pro forma Form 1120 in 15 minutes. Every field linked to official IRS instructions. $49, no CPA needed.
More on Form 1120 Corporate Tax Return
1:14Form 1120 for Foreign-Owned LLCs: What You Need to Know (2025 Tax Year)
Form 1120 Explained — What It Is, Who Files, and How It Works
Form 1120 Explained: What It Is, Who Files It, and How It Works (2025-2026)
Form 1120 Filing Deadlines, Extensions, and Payment Rules
Form 1120 Filing Deadlines and Extension Rules for C Corporations (2025-2026)
LLC Elected as C-Corp — Filing Requirements and Special Rules
LLC Elected as C-Corp: Form 1120 Filing Requirements and Special Rules
Form 1120 Schedules Explained — Schedule J, L, M-1, and M-2
Form 1120 Schedules Explained: Schedule J, L, M-1, and M-2
Net Operating Losses for C Corporations — Carryforward and 80% Rule