EIN reference number 101 is a name conflict: your legal name already exists, or closely resembles a name, in IRS records. The online assistant blocks the application and shows code 101. The fix is a paper Form SS-4 filed by fax or mail.
Reference number 101 is the most common EIN application stop. It means the IRS online assistant found a name conflict across the 50 states and cannot auto-assign the number. Retrying online returns 101 again, so the fix is a paper Form SS-4 sent by fax to 855-641-6935, which returns the EIN in 4 to 7 business days at $0. Codes 102 and 103 flag a name or SSN mismatch; codes 109, 110, 112, and 113 are technical errors that clear on a retry; code 114 is the 1-per-day limit; code 115 flags a deceased responsible party. No IRS route ever charges a fee.
EIN reference number 101 is a name-conflict code from the IRS online EIN assistant. It means your legal name already exists, or closely resembles a name, in IRS records. The system stops the application and cannot assign the 9-digit EIN online.
The online assistant checks each new name against every entity in IRS files across the 50 states. When 2 names match too closely, the software cannot decide which entity owns the record. It halts and prints reference 101 instead of an EIN. This is a deliberate safeguard, not a website crash.
Reference 101 is the single most common stop in the whole EIN flow. The IRS issues about 5 million EINs each year, and a large share of blocked sessions carry code 101. It appears for LLCs, corporations, sole proprietors, and nonprofits alike. The route back to an EIN is a paper Form SS-4, covered below and on the Form SS-4 guide.
5 patterns cause reference 101: a duplicate legal name, an existing EIN for the same entity, a responsible party already linked to an EIN, a name matching a dissolved business, or a state-registration name clash.
The IRS matches on the entity name and on the responsible party named on line 7a. When either already ties to an EIN, the assistant returns 101. A single-member LLC named the same as an existing LLC in another state is the classic trigger. So is a sole proprietor whose SSN already anchors a prior EIN.
| Trigger | Why it fires 101 | The fix |
|---|---|---|
| Duplicate legal name | Name matches an entity in the 50 states | File Form SS-4 by fax |
| Entity already has an EIN | The IRS holds 1 EIN for that record | Recover the old EIN, not a new one |
| Responsible party linked | An SSN or EIN ties to a prior filing | Fax SS-4 for a reviewer to assign |
| Dissolved-business name reuse | An old record still sits in IRS files | File Form SS-4 by fax or mail |
| State-registration clash | 2 states hold a near-identical name | File Form SS-4 by fax |
Sources: IRS EIN online assistant, IRS Form SS-4 instructions, verified August 2026.
File a paper Form SS-4 by fax or mail. The online assistant stays blocked for a 101, so a human reviewer must clear it. Fax the signed SS-4 to 855-641-6935 in the US, and the IRS returns the EIN in 4 to 7 business days at $0.
Retrying the online application returns code 101 again within 1 session, so the paper route is the only path. Follow these 5 steps, then track delivery on the get an EIN by fax page. Mail filers use the apply for an EIN by mail route instead.
| Step | Action | Detail |
|---|---|---|
| 1 | Confirm the code is 101 | Not a technical 109, 110, 112, or 113 |
| 2 | Download Form SS-4 | The current IRS PDF, 2 pages |
| 3 | Complete line 1 and line 7a | Exact legal name and responsible party |
| 4 | Sign and fax the SS-4 | 855-641-6935 US, 855-215-1627 abroad |
| 5 | Wait for the EIN | 4 to 7 business days by return fax |
The IRS assigns the EIN at $0 by any method. A mailed SS-4 returns the number in 6 to 11 weeks, so fax is faster by weeks. Only 1 signed original goes to the IRS. International applicants without US fax access dial the IRS at 267-941-1099 to apply by phone.
The IRS online assistant uses 9 common reference numbers: 101, 102, 103, 109, 110, 112, 113, 114, and 115. Code 101 is a name conflict; 102 and 103 are mismatches; 109 to 113 are technical; 114 is a daily limit; 115 flags a deceased party.
One master table maps every code to its meaning, its cause, and its fix. Read the code on the failure screen first, then match the row. Only the technical codes clear on a retry; the rest need a paper Form SS-4 or a corrected entry.
| Code | Meaning | Cause | Fix |
|---|---|---|---|
| 101 | Name conflict | Name exists across the 50 states | Fax Form SS-4 |
| 102 | SSN or ITIN mismatch | Name control fails against the SSN | Fax Form SS-4 |
| 103 | Existing EIN conflict | An EIN already ties to that address | Fax Form SS-4 |
| 109 | Technical error | The assistant dropped the session | Retry after 24 hours |
| 110 | Technical error | A system timeout mid-session | Retry after 24 hours |
| 112 | Technical error | A field failed to submit | Retry after 24 hours |
| 113 | Technical error | A processing fault on the IRS side | Retry after 24 hours |
| 114 | Daily limit reached | 1 EIN per responsible party per day | Apply again the next day |
| 115 | Deceased responsible party | A date-of-death flag on the record | Correct record, fax SS-4 |
Sources: IRS EIN online assistant reference codes, IRS Form SS-4 instructions, verified August 2026.
Reference 102 is an SSN or ITIN mismatch: the responsible party name does not match the number on file. Reference 103 is an existing-EIN conflict, where an EIN already ties to that address or entity. Both need a faxed Form SS-4.
Code 102 fires when the name control the IRS derives from line 7a fails against the Social Security record. A typo in the responsible party name is the frequent cause. Code 103 fires when the assistant finds an EIN already assigned to the same physical address, which points to a prior registration.
Neither code clears by retrying online. You confirm the SSN, the ITIN, and the legal name against source documents, then file Form SS-4 by fax. A reviewer resolves the mismatch and assigns the EIN in 4 to 7 business days at $0. If an EIN already exists, recover it through an EIN number lookup instead of applying twice.
Reference numbers 109, 110, 112, and 113 are technical errors on the IRS side, not faults in your application. The online assistant timed out or dropped a field mid-session. You retry after 24 hours, and most clear on the second attempt at $0.
These 4 codes share 1 fix: wait and retry. The IRS EIN assistant runs from 7 a.m. to 10 p.m. Eastern time, Monday to Friday. A session that stalls near closing or during peak load returns a technical code. Re-entering the same data the next business day assigns the EIN in 1 session.
| Code | Type | Clears on retry? |
|---|---|---|
| 109 | Session drop | Yes, after 24 hours |
| 110 | System timeout | Yes, after 24 hours |
| 112 | Field submit error | Yes, after 24 hours |
| 113 | Processing fault | Yes, after 24 hours |
When a technical code repeats past 2 or 3 attempts, switch to the paper Form SS-4 by fax. The fax route bypasses the assistant entirely and returns the EIN in 4 to 7 business days. See all 4 filing methods on the how to get an EIN number page.
Reference 114 is the daily limit: the IRS issues 1 EIN per responsible party per 24 hours. Reference 115 means IRS records flag the responsible party as deceased. Code 114 clears the next day; code 115 needs a corrected record and a faxed Form SS-4.
The 1-per-day cap under code 114 applies to the person named on line 7a, not the business. An accountant opening several entities hits 114 fast. You wait until the next calendar day and apply again at $0. There is no faster online workaround, since the limit is fixed at 1 EIN per party per day.
Code 115 appears when a date-of-death flag sits on the responsible party record, common when settling an estate or a trust. You confirm the correct responsible party, then file Form SS-4 by fax so a reviewer can override the flag. The EIN number lookup hub links the estate and trust routes.
Run 4 checks before you apply. Confirm the legal name is unique, confirm the entity has no prior EIN, confirm the responsible party details match IRS records, and apply once per party per 24-hour day inside the 7 a.m. to 10 p.m. window.
Most reference errors trace to a name clash or a duplicate application. A quick lookup before filing catches an existing EIN and avoids code 103. Entering the exact legal name from your formation documents avoids code 101 and code 102. These checks cost $0 and take minutes.
| Check | Prevents |
|---|---|
| Search for an existing EIN first | Code 103 duplicate |
| Use the exact legal name | Codes 101 and 102 |
| Verify responsible party on line 7a | Codes 102 and 115 |
| Apply once per party per day | Code 114 daily limit |
When a name is genuinely unique but 101 still fires, the conflict sits deeper in IRS records than a public search reveals. That case always resolves through a faxed Form SS-4 and a manual review, not a retry.
One reference table for every fixed value a reference-101 fix relies on: the 9 codes, the IRS contact lines, the fax numbers, and the delivery windows. Business days exclude the roughly 11 US federal holidays.
| Reference | Value |
|---|---|
| Name-conflict code | 101 |
| SSN or ITIN mismatch code | 102 |
| Existing-EIN conflict code | 103 |
| Technical error codes | 109, 110, 112, 113 |
| Daily-limit code | 114 |
| Deceased-party code | 115 |
| Online EINs per party per day | 1 |
| IRS EIN assistant hours (ET) | 7 a.m. to 10 p.m. |
| Fax delivery of the EIN | 4 to 7 business days |
| Mail delivery of the EIN | 6 to 11 weeks |
| IRS fax, US-based entity | 855-641-6935 |
| IRS fax, international | 855-215-1627 |
| IRS Business & Specialty line | 800-829-4933 |
| IRS international line | 267-941-1099 |
| EIN application form | SS-4, 2 pages |
| Legal-name line on SS-4 | Line 1 |
| Responsible-party line on SS-4 | Line 7a |
| IRS fee, any method | $0 |
| SS-4 postage range | $1.55 to $30 |
| New EINs issued per year | About 5 million |
| Confirmation letter | CP-575 |
| Verification letter | 147C |
| Governing EIN statute | 26 U.S.C. 6109 |
| Corporate tax rate | 21 percent |
| Self-employment tax | 15.3 percent |
| Non-US entity form | 5472 |
| einnumber.co filing price | $67 Standard, $97 Fast |
Sources: IRS EIN online assistant, IRS Form SS-4 instructions, 26 U.S.C. 6109, verified August 2026.
9 more questions on reference 101 and the other codes. Every IRS route costs $0. Code 101 needs a faxed Form SS-4 that returns the EIN in 4 to 7 business days; technical codes clear on a retry after 24 hours.
Reference number 101 means the IRS online assistant found a name conflict. Your legal name matches or closely resembles an entity already in IRS records across the 50 states. The system stops the application and shows code 101. You then file Form SS-4 by fax in 4 business days, or by mail in 6 to 11 weeks.
No. Reference 101 is not a data-entry mistake you retype away. It flags a name-similarity review that only an IRS employee clears by hand. Retrying online returns code 101 again inside 1 session. The single fix is a paper Form SS-4 sent to the IRS by fax at 855-641-6935 or by mail.
File Form SS-4 outside the online system. Download the current SS-4 PDF, confirm the legal name on line 1, sign it, and fax it to 855-641-6935 inside the US or 855-215-1627 abroad. The IRS assigns the EIN by return fax in 4 to 7 business days, at a cost of $0.
A sole proprietor gets code 101 when the personal name already anchors an EIN, or when an SSN links to a prior EIN. The IRS flags the responsible party, not only the business name. A faxed Form SS-4 lets a reviewer assign a second EIN in 4 business days at $0.
Reference 101 is a permanent name conflict that needs a paper SS-4. Reference 114 is a daily cap: the IRS issues 1 EIN per responsible party per 24 hours. Code 114 clears the next day at $0, while code 101 never clears by retrying the online assistant.
Yes. Code 101 blocks only the online route, not the EIN itself. About 5 million EINs issue each year, and many start as a 101. A faxed Form SS-4 returns the number in 4 to 7 business days; a mailed SS-4 returns it in 6 to 11 weeks, both at $0.
No. The IRS charges $0 for an EIN by every method, including the fax and mail routes that clear a 101. Only postage costs money, from $1.55 to about $30. Any site charging a fee to fix reference 101 is a paid filing service, not the IRS itself.
Codes 109, 110, 112, and 113 are technical errors on the IRS side, not faults in your data. The online assistant times out or drops the session. You retry after 24 hours inside the 7 a.m. to 10 p.m. Eastern window. Most clear on the second attempt at $0.
Reference 115 means IRS records show the responsible party as deceased, or a date-of-death flag blocks the entry. You correct the responsible-party details, then file Form SS-4 by fax. A reviewer assigns the EIN in 4 business days once the record matches, at a cost of $0.