# Tax code

Source: https://developer.avalara.com/avatax-for-ap/tdz2243002239631/

# Tax code

**Element type:** Required

**Endpoints/models used:**[LineItemModel](https://developer.avalara.com/api-reference/avatax/rest/v2/models/LineItemModel/)

Your UI must include a method for allowing users to specify a tax code for each line item in a transaction. You can use your own tax code mapping or you can use standard Avalara tax codes. For a full list of tax codes, run the [ListTaxCodes](https://developer.avalara.com/api-reference/avatax/rest/v2/methods/Definitions/ListTaxCodes/) API, or you can use the [Avalara Tax Code Search](https://taxcode.avatax.avalara.com/) tool.

Tax codes are specified using the `taxCode` field on the [LineItemModel](https://developer.avalara.com/api-reference/avatax/rest/v2/models/LineItemModel/). This field is optional for users. If a `taxCode` isn't specified, then AvaTax will treat that item as a taxable item. More information about Avalara tax codes is available in the [Avalara tax codes](https://knowledge.avalara.com/bundle/dqa1657870670369_dqa1657870670369/page/Avalara_tax_codes.html) article in the Knowledge Center.

**View example**:

```
{
  ...,
  "lines": [
    {
      "number": "1",
      "quantity": 1,
      "amount": 100,
      "taxCode": "PS081282",
      "itemCode": "Y0001",
      "description": "Yarn"
    }
  ],
  ...
} 
```