# You can only provide an external tax_mode when partially refunding.

You're attempting to pass `tax_mode: external` with a `type` other than `partial` or an `action` other than `refund`.

---

## Example

```json
{
  "error": {
    "type": "request_error",
    "code": "adjustment_tax_mode_not_allowed",
    "detail": "You're attempting to pass `tax_mode: external` with a `type` other than `partial` or an `action` other than `refund`.",
    "documentation_url": "https://developer.paddle.com/errors/adjustments/adjustment_tax_mode_not_allowed"
  },
  "meta": {
    "request_id": "00000000-0000-0000-0000-000000000000"
  }
}
```

## Details

| Attribute | Value |
| --- | --- |
| Status code | 400 |
| Error code | `adjustment_tax_mode_not_allowed` |
| Error message | You're attempting to pass `tax_mode: external` with a `type` other than `partial` or an `action` other than `refund`. |

## Common causes

- You're trying to create an adjustment where the `tax_mode` is `external`, but the `type` is `full`. Only partial refunds can be created using external tax amounts.
- You're trying to create an adjustment where the `tax_mode` is `external`, but the `action` is one other than `refund`. Only refunds can be created using external tax amounts.

## Common solutions

- Ensure the `type` is `partial` and `action` is `refund`.
- Pass `internal` as the `tax_mode` to specify that amounts are inclusive of tax.