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EIN Reference Number 101: What It Means & How to Fix It
EIN reference number 101 is the most common error the IRS online EIN tool returns. It signals a name conflict — the IRS found an existing record that matches your entity. Here is what reference 101 means, what the other codes mean, and how to get your EIN despite the error.
Last updated: June 28, 2026
Short Answer
EIN reference number 101 means the IRS online EIN tool hit a name conflict. The system found an existing record that matches your business name or name control, so it cannot auto-assign the EIN. It is the most common online EIN error. The fix is to file Form SS-4 by fax to 855-215-1627, where a human reviewer resolves the conflict and assigns your EIN.
The IRS online EIN tool can run for several minutes and then stop with a cryptic "reference number 101" and no EIN. The error looks alarming, but it almost always points to one specific, fixable problem. This article explains what reference number 101 means, why it appears even for unique business names, what the other reference codes signal, and how to get your EIN despite the rejection.
What Does EIN Reference Number 101 Mean?
EIN reference number 101 means the IRS online EIN application found a name conflict and stopped. The automated tool compares your entity name against existing IRS and state records, and a match — exact or close — prevents it from issuing the EIN instantly.
The error is common and rarely means anything is wrong with your business. It means the automated system needs a human to look at the application. The 101 code is a referral to manual review, not a rejection of your right to an EIN.
| Detail | Reference 101 |
|---|---|
| Meaning | Name conflict / name control match |
| How common | The most frequent online EIN error |
| Is it a rejection? | No — it requires manual review |
| The fix | File Form SS-4 by fax for manual processing |
See the full EIN rejection guide for every error the online tool can return.
Why Did You Get Reference Number 101?
Reference 101 appears for 4 main reasons, and several can occur even when your business name looks unique to you. The IRS matches on "name control," a shortened form of the legal name, so near-matches trigger the flag.
- Same name in another state. An entity with a similar name registered elsewhere shares your name control.
- Responsible party already has an EIN. The person on Line 7a is tied to an existing entity with a matching name.
- Existing entity name match. A dissolved or active company shares your name control in IRS records.
- Foreign-owned entity review. Applications from non-US responsible parties are routinely routed to manual review.
For non-residents, reference 101 is almost moot — the online tool already requires an SSN you do not have, so the fax SS-4 path is your route regardless. The name conflict resolves during that manual review.
What Do the Other EIN Reference Numbers Mean?
The IRS online tool returns several reference codes besides 101, and each points to a specific cause. Knowing the code tells you whether to fix data, wait, or file by fax.
| Code | Meaning | What to do |
|---|---|---|
| 101 | Name conflict / name control match | File SS-4 by fax for manual review |
| 102 | SSN or ITIN mismatch | Correct the responsible party's tax ID |
| 103 | Existing EIN issue | Check whether the entity already has an EIN |
| 104 | Third-party designee conflict | Fix the designee details on the form |
| 105 | Too many attempts | Wait and refile, or file by fax |
| 106 | Single-member LLC missing a tax ID | Add the responsible party's SSN or file by fax |
| 107 | Single-member LLC with too many locations | Review the structure and file by fax |
| 109-113 | IRS system or technical error | Retry later in the day |
| 114 | Daily limit reached | The IRS issues one EIN per responsible party per day |
| 115 | Responsible party is deceased | Update the responsible party |
Codes 109 through 113 are temporary system errors — wait and retry. Code 114 means you hit the one-EIN-per-day cap; try again the next business day. Most data and conflict errors, including 101, resolve through the faxed SS-4.
How Do You Fix Reference 101 and Get Your EIN?
Fix reference 101 by switching from the online tool to a faxed Form SS-4, which a human reviewer processes. The automated system cannot clear a name conflict; a reviewer can.
Confirm You Do Not Already Have an EIN
Complete Form SS-4 Carefully
File by Fax
The faxed path is also the standard route for non-residents and anyone the online IRS EIN tool blocks. The name conflict that triggered reference 101 disappears once a person reviews the application. See the EIN online application overview for how the automated tool compares to fax filing.
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ein.so files Form SS-4 by fax with the IRS and delivers your EIN by email. No SSN, no US address, no IRS phone calls.
| Plan | Price | Processing |
|---|---|---|
| Standard | $49 | 4-7 business days |
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Frequently Asked Questions
What does EIN reference number 101 mean?
EIN reference number 101 means the IRS online EIN tool found a name conflict. Your business name matches or closely resembles an existing entity in IRS or state records, so the system cannot auto-assign the EIN. It is the most common online EIN error. The fix is to file Form SS-4 by fax for manual review.
How do I fix EIN reference number 101?
Fix reference number 101 by filing Form SS-4 by fax to the IRS at 855-215-1627 instead of using the online tool. A human reviewer resolves the name conflict that the automated system could not. Most error-free faxed forms return an EIN in 4-7 business days. ein.so handles this filing for non-residents for $49.
Why did I get reference 101 if my business name is unique?
Reference 101 can appear even with a seemingly unique name. Causes include a similar name registered in another state, the responsible party already holding an EIN, a name that matches an existing entity's name control, or a foreign-owned entity flagged for manual review. The fax SS-4 method resolves all of these.
What do EIN reference numbers 102 to 115 mean?
Reference 102 means an SSN or ITIN mismatch. 103 signals an existing EIN issue. 104 is a third-party designee conflict. 105 means too many attempts. 106 and 107 involve single-member LLC issues. 109 through 113 are technical errors to retry later. 114 is the daily limit. 115 means the responsible party is deceased.
Can I get an EIN by fax after a reference 101 error?
Yes. Filing Form SS-4 by fax is the standard fix for reference 101. The online tool is automated and rejects name conflicts, but a faxed SS-4 goes to a human reviewer who can assign the EIN despite the flag. Fax it to 855-215-1627. Non-residents without an SSN must use this method anyway.
Does reference 101 mean I already have an EIN?
Not necessarily. Reference 101 is a name conflict flag, not confirmation of an existing EIN for your business. The conflict may be with a different entity that shares your name control. If you suspect your own business already has an EIN, request a Letter 147C from the IRS to confirm before filing again.
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