openapi: 3.0.3
info:
  title: TaxJar Sales Tax Categories Taxes API
  description: REST API for real-time sales tax calculation, rooftop-level rate lookups, tax category listing, transaction management (orders and refunds), customer exemption management, nexus region tracking, address validation, and VAT validation. Supports token-based authentication via Authorization header. TaxJar is a Stripe company providing sub-20ms response times and 99.999% historical uptime.
  version: '2.0'
  contact:
    name: TaxJar Developer Support
    url: https://support.taxjar.com/category/233-taxjar-api
  termsOfService: https://www.taxjar.com/terms/
  x-api-id: taxjar-sales-tax
servers:
- url: https://api.taxjar.com/v2
  description: Production
- url: https://api.sandbox.taxjar.com/v2
  description: Sandbox
security:
- bearerAuth: []
tags:
- name: Taxes
  description: Sales tax calculation
paths:
  /taxes:
    post:
      operationId: calculateTaxForOrder
      summary: Calculate sales tax for an order
      description: Calculates the sales tax for a given order based on origin and destination addresses, line items, and other order attributes. Returns the amount of sales tax to collect along with a breakdown by jurisdiction.
      tags:
      - Taxes
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TaxRequest'
      responses:
        '200':
          description: Tax calculation result
          content:
            application/json:
              schema:
                type: object
                properties:
                  tax:
                    $ref: '#/components/schemas/Tax'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    Jurisdictions:
      type: object
      properties:
        country:
          type: string
          description: Country code
          example: US
        state:
          type: string
          description: State code
          example: CA
        county:
          type: string
          description: County name
          example: LOS ANGELES
        city:
          type: string
          description: City name
          example: LOS ANGELES
    Tax:
      type: object
      properties:
        order_total_amount:
          type: number
          format: float
          description: Total order amount
          example: 16.5
        shipping:
          type: number
          format: float
          description: Shipping amount
          example: 1.5
        taxable_amount:
          type: number
          format: float
          description: Amount subject to tax
          example: 15.0
        amount_to_collect:
          type: number
          format: float
          description: Total tax amount to collect
          example: 1.35
        rate:
          type: number
          format: float
          description: Overall tax rate
          example: 0.09
        has_nexus:
          type: boolean
          description: Whether seller has nexus in the destination
          example: true
        freight_taxable:
          type: boolean
          description: Whether shipping is taxable
          example: false
        tax_source:
          type: string
          description: Tax sourcing rule applied (origin or destination)
          example: destination
        exemption_type:
          type: string
          description: Exemption type applied
        jurisdictions:
          $ref: '#/components/schemas/Jurisdictions'
        breakdown:
          $ref: '#/components/schemas/Breakdown'
    LineItemRequest:
      type: object
      properties:
        id:
          type: string
          description: Unique identifier for the line item
        quantity:
          type: integer
          description: Quantity of the item
          example: 1
        product_identifier:
          type: string
          description: Product SKU or identifier
        description:
          type: string
          description: Description of the product
        product_tax_code:
          type: string
          description: Product tax code for category-specific rates
        unit_price:
          type: number
          format: float
          description: Unit price of the item
          example: 15.0
        discount:
          type: number
          format: float
          description: Discount amount for this line item
        sales_tax:
          type: number
          format: float
          description: Sales tax collected for this line item
    Breakdown:
      type: object
      properties:
        taxable_amount:
          type: number
          format: float
        tax_collectable:
          type: number
          format: float
        combined_tax_rate:
          type: number
          format: float
        state_taxable_amount:
          type: number
          format: float
        state_tax_rate:
          type: number
          format: float
        state_tax_collectable:
          type: number
          format: float
        county_taxable_amount:
          type: number
          format: float
        county_tax_rate:
          type: number
          format: float
        county_tax_collectable:
          type: number
          format: float
        city_taxable_amount:
          type: number
          format: float
        city_tax_rate:
          type: number
          format: float
        city_tax_collectable:
          type: number
          format: float
        special_district_taxable_amount:
          type: number
          format: float
        special_tax_rate:
          type: number
          format: float
        special_district_tax_collectable:
          type: number
          format: float
        line_items:
          type: array
          items:
            $ref: '#/components/schemas/BreakdownLineItem'
    BreakdownLineItem:
      type: object
      properties:
        id:
          type: string
        taxable_amount:
          type: number
          format: float
        tax_collectable:
          type: number
          format: float
        combined_tax_rate:
          type: number
          format: float
        state_taxable_amount:
          type: number
          format: float
        state_sales_tax_rate:
          type: number
          format: float
        state_amount:
          type: number
          format: float
        county_taxable_amount:
          type: number
          format: float
        county_tax_rate:
          type: number
          format: float
        county_amount:
          type: number
          format: float
        city_taxable_amount:
          type: number
          format: float
        city_tax_rate:
          type: number
          format: float
        city_amount:
          type: number
          format: float
        special_district_taxable_amount:
          type: number
          format: float
        special_tax_rate:
          type: number
          format: float
        special_district_amount:
          type: number
          format: float
    TaxRequest:
      type: object
      required:
      - to_country
      - to_zip
      - to_state
      - amount
      - shipping
      properties:
        from_country:
          type: string
          description: Two-letter ISO country code of origin
          example: US
        from_zip:
          type: string
          description: Postal code of origin
          example: '94025'
        from_state:
          type: string
          description: Two-letter state code of origin
          example: CA
        from_city:
          type: string
          description: City of origin
          example: Menlo Park
        from_street:
          type: string
          description: Street address of origin
        to_country:
          type: string
          description: Two-letter ISO country code of destination
          example: US
        to_zip:
          type: string
          description: Postal code of destination
          example: '90002'
        to_state:
          type: string
          description: Two-letter state code of destination
          example: CA
        to_city:
          type: string
          description: City of destination
          example: Los Angeles
        to_street:
          type: string
          description: Street address of destination
        amount:
          type: number
          format: float
          description: Total amount of the order (excluding shipping)
          example: 15.0
        shipping:
          type: number
          format: float
          description: Total shipping cost
          example: 1.5
        customer_id:
          type: string
          description: Unique identifier of the customer for exemption lookup
        exemption_type:
          type: string
          description: Type of exemption (wholesale, government, other, non_exempt)
          enum:
          - wholesale
          - government
          - other
          - non_exempt
        line_items:
          type: array
          description: List of line items in the order
          items:
            $ref: '#/components/schemas/LineItemRequest'
    Error:
      type: object
      properties:
        error:
          type: string
          description: Error type
        detail:
          type: string
          description: Human-readable error detail
        status:
          type: integer
          description: HTTP status code
  responses:
    Unauthorized:
      description: Unauthorized - invalid or missing API token
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Bad request - invalid parameters
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Use your TaxJar API token. Format: "Bearer [token]" or "Token token=[token]"'