> Portal Navigation:
> 
> - Append `.md` to any URL under `https://dev.wix.com/docs/` to get its markdown version.
> - Pages are either content pages (article or reference text) or menu pages (a list of links to child pages).
> - To get a menu page, truncate any URL to a parent path and append `.md` (e.g. `https://dev.wix.com/docs/sdk.md`, `https://dev.wix.com/docs/sdk/core-modules.md`).
> - Top-level index of all portals: https://dev.wix.com/docs/llms.txt
> - Full concatenated docs: https://dev.wix.com/docs/llms-full.txt

## Resource: Introduction

## Article: Introduction

## Article Link: https://dev.wix.com/docs/api-reference/business-solutions/e-commerce/extensions/tax/tax-calculation/introduction.md

## Article Content:

# About the Tax Calculation API

The Tax Calculation API allows you to retrieve the available tax calculators for a site and to calculate tax. Use the Tax Calculations API together with the 
[Tax Groups API](https://dev.wix.com/docs/api-reference/business-solutions/e-commerce/extensions/tax/tax-groups/introduction.md) and the 
[Tax Regions API](https://dev.wix.com/docs/api-reference/business-solutions/e-commerce/extensions/tax/tax-regions/introduction.md) to customize the application of tax for a business.

## Before you begin
It's important to note the following before starting to code: 
+ Tax is calculated based on the [tax region](https://dev.wix.com/docs/api-reference/business-solutions/e-commerce/extensions/tax/tax-regions/introduction.md) and a tax region requires an `appId` for an available tax calculator. Call [List Tax Calculators](https://dev.wix.com/docs/api-reference/business-solutions/e-commerce/extensions/tax/tax-calculation/list-tax-calculators.md) to retrieve a list of available tax calculators for a site, then create and manage your [tax regions](https://dev.wix.com/docs/api-reference/business-solutions/e-commerce/extensions/tax/tax-regions/introduction.md) before [calculating tax](https://dev.wix.com/docs/api-reference/business-solutions/e-commerce/extensions/tax/tax-calculation/calculate-tax.md).

## Use case
+ [Calculate multi-state tax for the United States](https://dev.wix.com/docs/api-reference/business-solutions/e-commerce/extensions/tax/tax-calculation/sample-flows.md#calculate-multi-state-tax-for-the-united-states)


## Terminology
- **Tax calculator**: An app that is used under the hood to calculate tax for a Wix site. The app calculates tax based on the tax group of the product and the tax region of the sale. A site assigns each tax region to the Wix manual tax calculator or an external calculator app to properly calculate tax.
- **Wix manual tax calculator**: The default tax calculator installed with a Wix site. The tax rates to apply for this calculator can be manually adjusted in the [Tax Settings in the Wix dashboard](https://www.wix.com/my-account/site-selector/?buttonText=Select%20Site&title=Select%20a%20Site&autoSelectOnSingleSite=true&actionUrl=https:%2F%2Fwww.wix.com%2Fdashboard%2F%7B%7BmetaSiteId%7D%7D%2Fecom-platform/tax/).

@sdk_package_setup