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Vendor Risk

W-9 / Tax Form Check

A W-9/W-8 completeness check using legal name, final four identifier digits, and supplied dates. It is not tax advice or tax-ID verification.

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CONTRACT

Predictable for agents. Legible for reviewers.

REST
POST /v1/tax-forms/checks
MCP tool
check_tax_form
Inputs
Form type, optional legal name, last four digits only, signed/expiry dates, and entity country.
Returns
CLEAR or REVIEW_REQUIRED with specific completeness evidence.
Latency
Synchronous
Usage unit
Control check

AGENT-READABLE EXCEPTIONS

TAX_FORM_LEGAL_NAME_MISSINGTAX_FORM_IDENTIFIER_INCOMPLETETAX_FORM_SIGNATURE_DATE_MISSINGTAX_FORM_EXPIRED

EXAMPLE REQUEST

POST /v1/tax-forms/checks
Authorization: Bearer apc_...
Content-Type: application/json

{
  "form_type": "W9",
  "legal_name": "Acme, Inc.",
  "tax_identifier_last4": "1234",
  "signed_on": "2026-01-01",
  "entity_country": "US"
}

REPRESENTATIVE RESPONSE

{
  "product": "W-9 / Tax Form Check",
  "status": "COMPLETED",
  "decision": "CLEAR",
  "exceptions": [],
  "evidence": {
    "form_type": "W9",
    "has_legal_name": true,
    "has_identifier_last4": true,
    "signed_on": "2026-01-01"
  },
  "next_action": "Apply the customer's tax-review policy; this is a completeness check only."
}
Structured outputStatus, decision, exceptions, evidence, confidence, and next action where relevant.
Tenant-scopedOnly the caller's organization records are searched or returned.
Read-onlyNo accounting record, vendor bank account, or payment is changed.

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Choose a capped marketplace plan, copy the generated request, and route the structured result through your own authorized workflow.

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