# Check an Australian tax identifier

Check the format and checksum of an Australian ABN, ACN or TFN. A valid checksum does not confirm registration, status, identity or ownership.

Canonical: https://aroai.com/tools/au_tax_id_check/

## Tool reference

MCP tool ID: `au_tax_id_check`. Availability: Live. Country: Australia.

Credit use: 1 credit.

## Input schema

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "scheme": {
      "type": "string",
      "enum": [
        "ABN",
        "ACN",
        "TFN"
      ]
    },
    "identifier": {
      "type": "string",
      "minLength": 8,
      "maxLength": 24
    }
  },
  "required": [
    "scheme",
    "identifier"
  ],
  "additionalProperties": false
}
```