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# Method name: calculateTax(options: Options, context: Context)

# Method package: billingTaxCalculation

# Method menu location: billingTaxCalculation --> calculateTax

# Method Link: https://dev.wix.com/docs/velo/events-service-plugins/billing/service-plugins/billing-tax-calculation/calculate-tax.md

# Method Description:

Calculates tax for the provided line items.

Tax is calculated for each line item based on the [tax region](https://dev.wix.com/docs/velo/api-reference/wix-billing-v2/tax-regions.md) 
in `lineItems.taxRegionId` and the [tax group](https://dev.wix.com/docs/velo/api-reference/wix-billing-v2/tax-groups.md) in `lineItems.taxGroupId`. 

The breakdown of calculated tax returned, includes:
+ `taxSummary`: The overall total tax calculated.
+ `lineItemTaxDetails.taxBreakdown`: The tax calculated for each line item in each jurisdiction.
+ `lineItemTaxDetails.taxSummary`: The total tax calculated for each line item.

### Where to find `calculateTax()`
When you [add the Tax Calculation service plugin](https://dev.wix.com/docs/develop-websites/articles/coding-with-velo/integrations/custom-extensions-spis/custom-app-extensions-using-sp-is.md#step-1-create-a-new-extension-on-your-wix-site), 
a folder is automatically added to your site. Use the `.js` file in the folder to write the code to determine how to calculate tax for an order.



# Method Code Examples:

*** Note: do not assume any prop names or enum values other than the ones in the example.

## Example of a `calculateTax()` return value

```javascript
export const calculateTax = async (options, context) => {
  return {
      "currency": "USD",
      "taxSummary": {
          "totalAmount": "170.00",
          "totalTax": "21.00",
          "totalTaxableAmount": "170.00",
          "totalTaxIncludedInPrice": "0.00"
      },
      "lineItemTaxDetails": [{
          "_id": "00000000-0000-0000-0000-000000000001",
          "itemName": "some",
          "quantity": 1,
          "taxBreakdown": [{
              "jurisdiction": "TEXAS",
              "jurisdictionType": "STATE",
              "nonTaxableAmount": "0.00",
              "rate": "0.20",
              "taxAmount": "15.00",
              "taxableAmount": "120.00",
              "taxType": "Sales",
              "taxName": "TX STATE TAX"
          }],
          "taxSummary": {
              "fullPrice": "120.00",
              "taxAmount": "12.00",
              "taxableAmount": "120.00"
          }
      },
      {
        "_id": "shipping",
        "itemName": "Free Shipping",
        "quantity": 1,
        "taxBreakdown": [
          {
            "jurisdiction": "",
            "nonTaxableAmount": "0",
            "rate": "0.12",
            "taxAmount": "6.00",
            "taxName": "",
            "taxType": "",
            "taxableAmount": "50"
          }
        ],
        "taxSummary": {
          "fullPrice": "50",
          "taxAmount": "6.00",
          "taxableAmount": "50.00"
        }
      }
      ]
  }
};
```

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