---
displayed_sidebar: servicesSidebar
---

import ParameterTypes from "@site/src/components/ParameterTypes"

# ITaxCalculationStrategy

## Methods

### calculate

**calculate**(`items`, `taxLines`, `calculationContext`): `Promise`<`number`\>

Calculates the tax amount for a given set of line items under applicable
tax conditions and calculation contexts.

#### Parameters

<ParameterTypes parameters={[
  {
    "name": "items",
    "type": "[`LineItem`](../classes/LineItem.mdx)[]",
    "description": "the line items to calculate the tax total for",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "taxLines",
    "type": "([`LineItemTaxLine`](../classes/LineItemTaxLine.mdx) \\| [`ShippingMethodTaxLine`](../classes/ShippingMethodTaxLine.mdx))[]",
    "description": "the tax lines that applies to the calculation",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "calculationContext",
    "type": "[`TaxCalculationContext`](../types/TaxCalculationContext.mdx)",
    "description": "other details relevant for the calculation",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

#### Returns

`Promise`<`number`\>

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "`Promise`<`number`\\>",
    "optional": false,
    "defaultValue": "",
    "description": "the tax total",
    "expandable": false,
    "children": []
  }
]} />