Verify a TIN - Palm API

Image showcasing a form to collect information, and the output of a TIN verification request

What it does

Verify TIN checks whether a TIN (EIN or SSN) matches the name on file at the IRS. It returns one of three results: matched, not matched, or pending (IRS unavailable). This is a single-purpose check. It does not run registry lookups, risk assessment, or any other verification step. If you need the full suite of business verification checks, use Verify a Business — which includes TIN verification as part of the workflow.

When to use it

Use the standalone TIN endpoint when you need to validate a TIN outside of a full verification flow:

1099 processing: Confirm TINs before filing to avoid IRS B-notices.
Pre-verification validation: Check a TIN before running a full business verification.
Bulk TIN hygiene: Validate TINs across your existing portfolio.
SSN verification: Validate an individual’s SSN and name against IRS records, independent of a person verification.

Request

POST /v1/tin/verification

Field	Type	Required	Description
`tin`	string	Yes	EIN (`XX-XXXXXXX` or 9 digits) or SSN (`XXX-XX-XXXX` or 9 digits)
`name`	string	Yes	For EIN: legal business name. For SSN: full name (`First Last` or `First Middle Last`)
`tin_type`	enum	Yes	`ein` or `ssn` — determines the validation path
`reference_id`	string	No	Your reference ID, echoed back in the response
`metadata`	object	No	Free-form key/value pairs stored on the verification record

Example request

Bash

curl -X POST https://api.getpalm.com/v1/tin/verification \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer sk_test_...' \
  -d '{
    "tin": "12-3456789",
    "tin_type": "ein",
    "name": "Acme Corporation",
    "reference_id": "tin_req_12345"
  }'

Response

Field	Type	Description
`verification_id`	string (UUID)	Unique identifier for this TIN verification.
`object`	string	Always `tin_verification`.
`tin_type`	enum	`ein` or `ssn` (echoes the request).
`matched`	boolean or null	`true` = match, `false` = no match, `null` = could not be determined.
`status`	enum	`completed`, `pending`, `in_progress`, or `failed`.
`unavailable_reason`	enum	Only present when `status` is `pending`. See below.
`reference_id`	string	Echoed from request, if provided.
`verified_at`	datetime	When the TIN was verified. Only present when `status` is `completed`.

Response states

Completed: The IRS returned a definitive answer. Check matched for the result.

JSON

{
  "verification_id": "550e8400-e29b-41d4-a716-446655440000",
  "object": "tin_verification",
  "tin_type": "ein",
  "matched": true,
  "status": "completed",
  "reference_id": "tin_req_12345",
  "created_at": "2026-04-22T05:33:01.665Z",
  "verified_at": "2026-04-22T05:33:01.665Z"
}

Pending: The IRS TIN matching service is temporarily unavailable. matched is null. Check unavailable_reason and retry later.

JSON

{
  "verification_id": "550e8400-e29b-41d4-a716-446655440000",
  "object": "tin_verification",
  "tin_type": "ein",
  "matched": null,
  "status": "pending",
  "unavailable_reason": "tin_matching_service_unavailable",
  "reference_id": "tin_req_12345",
  "created_at": "2026-04-22T05:33:01.665Z"
}

Unavailable reasons

Reason	What it means
`tin_matching_service_unavailable`	IRS TIN matching service is temporarily down. Retry later.
`tin_matching_token_unavailable`	Authentication with IRS service failed. Retry later.

Error codes

Reason	What it means
`tin_matching_not_configured`	TIN matching is not enabled for your account. Contact Palm.
`tin_matching_invalid_format`	The TIN format was rejected by the IRS service. Check the input.
`tin_matching_unknown_error`	Unexpected error. Retry, and contact Palm if it persists.

Handling IRS downtime

The IRS TIN matching service has scheduled and unscheduled downtime. When the service is unavailable, the endpoint returns status: pending with matched: null instead of failing. This lets you distinguish between “TIN didn’t match” (matched: false) and “we couldn’t check” (matched: null). Build your integration to handle the pending state: store the verification_id, and retry when your system is ready. Do not treat matched: null as a match or a non-match.

Verify TIN vs full business verification

	Verify TIN	Verify a Business
Endpoint	`POST /v1/tin/verification`	`POST /v1/business/verification`
What it checks	TIN + name against IRS only.	Registry, TIN, risk, watchlists and more.
Requires workflow	No.	Yes (`workflow_key`).
Requires vault record	No.	Yes (business must exist in vault).
Use case	Standalone TIN validation.	Full KYB verification.

For the full parameter reference, see the API Reference.

Documentation Index

​What it does

​When to use it

​Request

​Example request

​Response

​Response states

​Unavailable reasons

​Error codes

​Handling IRS downtime

​Verify TIN vs full business verification

​Next steps