es_aeat_tax_compliance_certificate

Spanish tax compliance certificate (AEAT)

Spanish Tax Agency certificate of being up to date with tax obligations (public procurement, grants or general); signed PDF with verification code (CSV), usually valid for 12 months.

Category: Tax
Country: Spain
Extracted fields: 7 fields
Cost: 1 credit

es_aeat_tax_compliance_certificatespecimen

Holder name
Holder ID number
Issue date
Purpose
Result
Is compliant
Secure Verification Code (CSV)

What it checks

National identifiers. Official checksum or format of the number (NIF, CPF, CURP, RUT, SSN…).es_nif
Holder. Name, number or date of birth match what you expect.
Recency. Issued less than N days ago.
Secure verification code. Format of the code used to check it with the issuer.
PDF electronic signature. PAdES signature verified when the original PDF is sent.

Extracted fields

Holder nameholder_name
Holder ID numberholder_id
Issue dateissue_date
Purposepurpose
Resultresult
Is compliantis_compliant
Secure Verification Code (CSV)csv_code

Sample request

curl https://api.constaia.com/v1/analyze \
  -H "Authorization: Bearer $CONSTAIA_API_KEY" \
  -F "file=@document.pdf" \
  -F 'options={
    "expect": "es_aeat_tax_compliance_certificate",
    "checks": {
      "max_age_days": 90,
      "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": "es_aeat_tax_compliance_certificate",
    "label": "Spanish tax compliance certificate (AEAT)",
    "confidence": 0.97
  },
  "verdict": {
    "expected": [
      "es_aeat_tax_compliance_certificate"
    ],
    "match": true,
    "status": "valid",
    "reasons": [
      {
        "code": "type_match",
        "severity": "info",
        "message": "The document is: Spanish tax compliance certificate (AEAT)."
      }
    ]
  },
  "fields": {
    "holder_name": {
      "value": "ESPECIMEN S.L.",
      "confidence": 0.99,
      "validated": true
    },
    "holder_id": {
      "value": "B12345674",
      "confidence": 0.98,
      "validated": null
    },
    "issue_date": {
      "value": "2026-09-01",
      "confidence": 0.97,
      "validated": null
    },
    "purpose": {
      "value": "Contratación con el sector público",
      "confidence": 0.96,
      "validated": null
    },
    "result": {
      "value": "POSITIVO",
      "confidence": 0.99,
      "validated": null
    },
    "is_compliant": {
      "value": true,
      "confidence": 0.98,
      "validated": null
    },
    "csv_code": {
      "value": "ABCDEFGH12345678",
      "confidence": 0.97,
      "validated": null
    }
  },
  "checks": [
    {
      "code": "id_number",
      "passed": true,
      "message": "id_number"
    },
    {
      "code": "csv_format",
      "passed": true,
      "message": "The verification code has a valid format."
    }
  ],
  "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…

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