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EIN and ITIN: US tax IDs explained for founders

Fix it · 3 min read

EIN rejected with reference number 101: what it means and how to fix it

The online application gives you a number and no explanation. Reference 101 is the most common, and in most cases the fix is to stop using the online form.

The short answer

IRS reference number 101 means the online EIN application detected a conflict — usually a business name too similar to an existing entity, or a responsible party the system cannot verify. The reliable fix is to apply on paper with Form SS-4 by fax, where a person reviews the application.

The IRS online EIN application returns a reference number instead of an explanation, which is unhelpful by design — the system is deliberately vague about why a validation failed. Reference 101 is by far the most common one founders hit.

What actually causes it

  • A name conflict. Your entity name is identical or very similar to one already on IRS records, possibly in a different state entirely.
  • A foreign responsible party. The system cannot validate a responsible party with no SSN or ITIN, which is the most common cause for international founders.
  • The entity is too new. State formation data has not yet reached the IRS. Days-old entities frequently fail validation.
  • A pre-existing EIN. The entity, or something the system believes is the entity, already has one.
  • Data mismatch. The name or address on the application does not match what the state recorded.

The paper route, step by step

  1. Download the current Form SS-4 from the IRS.
  2. Line 1 — the legal name exactly as it appears on your state formation certificate, including "LLC".
  3. Line 7a — the responsible party, who must be a natural person, not a company.
  4. Line 7b — their SSN or ITIN, or "Foreign" if they have neither.
  5. Line 9a — the entity type you actually formed.
  6. Line 10 — normally "Started new business".
  7. Line 18 — answer honestly about any prior EIN. A false answer here causes worse problems than a delay.
  8. Fax it to the number the current instructions give for your situation, and keep the transmission confirmation.

If your entity was formed within the last week or two, waiting a few days before submitting can help, because the underlying state data needs to reach the IRS.

If the name really is the conflict

Where a genuine name collision exists, the paper route still usually clears it because a reviewer can see that yours is a distinct entity in a distinct state. Changing your company name should be a last resort — it means amending the state filing and updating everything downstream.

EIN handled with formation

The SS-4 prepared and submitted correctly for foreign owners, so the first attempt is the one that works.

See what's included

Frequently asked questions

Can I just reapply online after a 101 error?
Reapplying online usually produces the same error, because the underlying conflict has not changed. Repeated attempts also risk creating a duplicate EIN if one of them succeeds unnoticed. The productive move is to switch to Form SS-4 by fax.
Does reference 101 mean my company name is taken?
Sometimes, but not always. It also appears when the responsible party cannot be verified, when the entity was formed very recently and state data has not propagated, and for applicants with a foreign responsible party. The code does not distinguish between these.
How long does the paper route take?
Longer than online, and the IRS does not reliably publish current processing times for international applicants. Fax is generally faster than post. Start it immediately rather than making further online attempts.

Sources

Last reviewed . Verify against the primary source before acting.

Founders 8 does not provide tax advice. Tax residency depends on facts and rules specific to each jurisdiction — review your position with a qualified adviser.

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