> ## Documentation Index
> Fetch the complete documentation index at: https://docs.smartcomply.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Company Tax ID

> Verify a Nigerian company's tax records using its CAC registration number.

<Note>
  Company/business only. This is a different check from [Company TIN](/v3/kyc/nigeria/tin) — Company Tax ID looks up FIRS tax records using the company's **CAC registration number**, while Company TIN looks up FIRS tax records using the company's **TIN**. Use whichever identifier you already have.
</Note>

The Company Tax ID endpoint validates a Nigerian company's tax records against the FIRS (Federal Inland Revenue Service) database using its CAC registration number, and returns the associated tax identification details.

## Endpoint

```
POST /api/onboarding/business/company_tax_id/
```

## Request

### Headers

| Header           | Value               | Required |
| ---------------- | ------------------- | -------- |
| `x-access-token` | Your API secret key | Yes      |
| `Content-Type`   | `application/json`  | Yes      |

### Body Parameters

| Parameter             | Type   | Required | Description                                                                                                                                 |
| --------------------- | ------ | -------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
| `registration_number` | string | Yes      | The company's CAC registration number, including its type prefix (e.g. `RC1234567`, `BN1234567`, `IT1234567`, `LP1234567`, or `LLP1234567`) |

### Example

<CodeGroup>
  ```bash cURL theme={null}
  curl -X POST "https://adhere-api.smartcomply.com/api/onboarding/business/company_tax_id/" \
    -H "x-access-token: YOUR_SECRET_KEY" \
    -H "Content-Type: application/json" \
    -d '{"registration_number": "RC1234567"}'
  ```

  ```python Python theme={null}
  import requests
  response = requests.post(
      "https://adhere-api.smartcomply.com/api/onboarding/business/company_tax_id/",
      headers={"x-access-token": "YOUR_SECRET_KEY", "Content-Type": "application/json"},
      json={"registration_number": "RC1234567"},
  )
  ```
</CodeGroup>

## Response

### 200 OK

| Field                                          | Type    | Description                                                           |
| ---------------------------------------------- | ------- | --------------------------------------------------------------------- |
| `data.valid`                                   | boolean | Whether a match was found                                             |
| `data.business_name`                           | string  | Registered company name                                               |
| `data.registration_number`                     | string  | CAC registration number                                               |
| `data.id_number`                               | string  | Company's Tax ID                                                      |
| `data.company_information.name`                | string  | Registered company name                                               |
| `data.company_information.registration_number` | string  | CAC registration number                                               |
| `data.company_information.tax_id`              | string  | Company's Tax ID                                                      |
| `data.company_information.tax_office`          | string  | Assigned tax office (not returned by Youverify for every company)     |
| `data.company_information.phone`               | string  | Registered phone number (not returned by Youverify for every company) |
| `data.company_information.email`               | string  | Registered email (not returned by Youverify for every company)        |

```json theme={null}
{
  "status": "success",
  "data": {
    "valid": true,
    "id_number": "2622476055669",
    "company_information": {
      "name": "OASIS TASTE & TREAT LTD",
      "registration_number": "RC9435541",
      "tin": null,
      "jtb_tin": null,
      "tax_id": "2622476055669",
      "tax_office": null,
      "phone": null,
      "email": null
    },
    "business_name": "OASIS TASTE & TREAT LTD",
    "registration_number": "RC9435541"
  },
  "message": "Company Tax ID details retrieved successfully"
}
```

### 400 Bad Request

```json theme={null}
{
  "status": "failed",
  "data": [],
  "message": "Registration Number is required."
}
```

```json theme={null}
{
  "status": "failed",
  "data": {"error_code": "INVALID_INPUT"},
  "message": "Company Tax ID check failed: ValidationError: Invalid registration number format. Valid format => RCxxxx, BNxxxxx, ITxxxxx, LPxxxxx or LLPxxxxx"
}
```

### 401 Unauthorized

```json theme={null}
{
  "status": "failed",
  "message": "Authentication credentials were not provided."
}
```