Use the tax parameter to show the information that needs to be collected from companies and employees.

{
  "id": "spa_h7zSw4NITCtef4Taf5yA",
  "label": "Federal Employer Identification Number",
  "description": "Enter your FEIN in the following format XX-XXXXXXX",
  "name": "federal_ein",
  "type": "string",
  "options": null,
  "depends_on": null,
  "editable": true,
  "effective_datable": false,
  "can_be_applied_for": true,
  "jurisdiction": "jur_mRpDYFyFSUD1ArZdrMis",
  "tax": "tax_afRJqY785WwYH0PrtFde",
  "setting": null,
  "valid_formats": [
      {
        "format": "##-#######"
      }
    ],
  "definitions": null,
  "default_value": null,
  "help_links": null,
  "submitter": "company"
}

Attribute	Description
id string	Unique identifier for the tax parameter.
label string	Short human-readable description identifying the tax parameter.
description string	Human-readable description identifying the tax parameter.
name string	Non-unique identifier for the tax parameter.
options list	(Optional)* List representation of the allowed value options when the type == select. See Tax Parameter Option.
type string	The tax parameter type. See types of tax parameters for a complete list of supported types.
depends_on object	(Optional) Representation of the dependency that this tax parameter has on another tax parameter. See Tax Parameter Dependency object. Dependencies are not fully supported for employee tax parameters.
editable boolean	Indicates whether the tax parameter can be edited.
effective_datable boolean	Indicates whether the tax parameter can be effective dated.
can_be_applied_for boolean	Indicates whether the tax parameter can be marked as applied for.
jurisdiction string	ID of tax parameter’s jurisdiction.
tax string	(Optional)* ID of the tax parameter’s related tax.
setting object	(Optional)* Representation of the tax parameter. See Tax Parameter Setting.
valid_formats list	(Optional)* List representation of the accepted formats for a particular tax parameter. A "#" indicates any numeric number (0-9) and a "@" indicates any alphanumeric value (0-9 or A-Z) at that particular position. Any other character outside of those two represent the actual character. For example: If the format is "12-###" then the accepted values must start with "12-".
definitions list	(Optional)* A list of effectively dated tax parameter definitions organized by the effective date sorted in a descending order. See Tax Parameter Definition.
default_value string	(Optional)* The default value used for the tax parameter for informational purposes. The `default_value` for a parameter with a non-empty `options` list will always correspond to the value of one of those options. Note:The API doesnot* automatically populate the tax parameter with this value.
help_links list	(Optional)* A list representing different websites that contain further information associated with the tax parameter. The objects within the list will always have a label and url field.
submitter string	The entity that should submit this parameter. Can be either `company` or `employee`.