us_irs_ein_letter

IRS EIN assignment letter (CP 575 / 147C)

IRS letter assigning (CP 575) or verifying (147C) a business's Employer Identification Number (EIN).

Category: Tax
Country: United States
Extracted fields: 6 fields
Cost: 1 credit

us_irs_ein_letterspecimen

Business name
Ein
Address
Postal code
Notice type
Issue date

What it checks

National identifiers. Official checksum or format of the number (NIF, CPF, CURP, RUT, SSN…).us_ein, us_zip
Postal code. Postal code format of the country.

Extracted fields

Business namebusiness_name
Einein
Addressaddress
Postal codepostal_code
Notice typenotice_type
Issue dateissue_date

Sample request

curl https://api.constaia.com/v1/analyze \
  -H "Authorization: Bearer $CONSTAIA_API_KEY" \
  -F "file=@document.pdf" \
  -F 'options={
    "expect": "us_irs_ein_letter",
    "checks": {
      "holder": {
        "full_name": "Carmen Especimen Ruiz"
      }
    },
    "storage": "none"
  }'

Sample response

Fictitious data. Shortened response.

200 OK · application/json

{
  "id": "an_01J9Z3K8QW4T6Y2B7N5M1R0PXC",
  "object": "analysis",
  "status": "completed",
  "livemode": false,
  "document": {
    "type": "us_irs_ein_letter",
    "label": "IRS EIN assignment letter (CP 575 / 147C)",
    "confidence": 0.97
  },
  "verdict": {
    "expected": [
      "us_irs_ein_letter"
    ],
    "match": true,
    "status": "valid",
    "reasons": [
      {
        "code": "type_match",
        "severity": "info",
        "message": "The document is: IRS EIN assignment letter (CP 575 / 147C)."
      }
    ]
  },
  "fields": {
    "business_name": {
      "value": "SPECIMEN CONSULTING LLC",
      "confidence": 0.99,
      "validated": true
    },
    "ein": {
      "value": "12-3456789",
      "confidence": 0.98,
      "validated": null
    },
    "address": {
      "value": "100 MAIN ST, SPRINGFIELD, IL",
      "confidence": 0.97,
      "validated": null
    },
    "postal_code": {
      "value": "62701",
      "confidence": 0.96,
      "validated": null
    },
    "notice_type": {
      "value": "CP 575 A",
      "confidence": 0.99,
      "validated": null
    },
    "issue_date": {
      "value": "2019-05-02",
      "confidence": 0.98,
      "validated": null
    }
  },
  "checks": [
    {
      "code": "id_number",
      "passed": true,
      "message": "id_number"
    }
  ],
  "warnings": [],
  "storage": {
    "mode": "none",
    "file_deleted_at": "2026-09-29T10:00:02Z",
    "expires_at": null
  },
  "usage": {
    "credits": 1,
    "pages": 1
  }
}

FAQ

Does Constaia prove the document is authentic?

No. It checks the type, data consistency and your rules, and flags signals such as a possible edit or a screen photo. That does not prove authenticity.

Is a copy of the document kept?

No, unless you ask for it. With storage "none" (the default) the file is deleted when the analysis ends.

And for the record…

Create your account, copy the test key and validate your first document in five minutes.

Create a free account Talk to sales