Tax Registrations V2 - Commenda — Entity Management, Indirect Tax, Compliance & Corporate APIs for Multinationals

Overview

The V2 Registration API is the next generation of Commenda’s tax registration system. It introduces enhanced support for international jurisdictions (including EU trade bloc schemes), composite tax types and filing frequencies, and automated condition validation for complex registration rules. V2 registrations use a content-driven approach where each registration is identified by a registration_tax_type_id — a content ID that encodes the jurisdiction, registration type, and tax type combination. The system validates your inputs against the content database to ensure correctness.

Getting started? Use the V2 Content API to discover available jurisdictions, registration options, and conditions before creating registrations.

What’s different from V1

Feature	V1	V2
Content identifier	`registration_content_id`	`registration_tax_type_id`
Filing frequency	Single string (`"QUARTERLY"`)	Array of strings (`["QUARTERLY", "ANNUAL_RECONCILIATION"]`)
Condition validation	Manual	Automated (prerequisites, mutual exclusivity, EU establishment checks)
EU trade bloc support	Basic (member state linking)	Full (Union OSS, Non-Union OSS, IOSS with establishment rules)
Registration conditions	Not exposed	Queryable via dedicated endpoint
Tax type details	Not available	Queryable with descriptions and recommendations

Key concepts

Registration tax type IDs

Each registration option has a unique registration_tax_type_id that encodes the jurisdiction and tax type combination. Examples:

REG_STATE_CEN_06_RST — California Retail Sales Tax
REG_COUNTRY_DE_3001_VAT — Germany VAT
REG_TRADEBLOC_EU_3000_UOSS_VAT — EU Union One-Stop Shop VAT

Use the Available Registrations endpoint to discover these IDs.

Composite tax types

Some registrations require multiple tax types to be filed together. V2 represents these as structured objects:

{
  "primary": "RST",
  "related": [
    { "value": "DTT", "optional": false }
  ]
}

Primary — The base tax type (always required)
Related with optional: false — Must be included alongside the primary type
Related with optional: true — May be included at your discretion

When creating a registration, pass all required tax types in the tax_types array.

Composite filing frequencies

Similarly, some jurisdictions require multiple filing frequencies. V2 represents frequencies as arrays:

{
  "primary": "QUARTERLY",
  "related": [
    { "value": "ANNUAL_RECONCILIATION", "optional": false }
  ]
}

When creating a registration, pass the full set of frequencies in the frequencies array (e.g., ["QUARTERLY", "ANNUAL_RECONCILIATION"]). Available frequency values: MONTHLY, QUARTERLY, SEMI_ANNUALLY, ANNUAL_CALENDAR_YEAR, FISCAL_YEAR, MONTHLY_ACCELERATED_PREPAY_EARLY, QUARTERLY_PREPAY_MONTHLY, ANNUAL_RECONCILIATION, BI_MONTHLY, TRI_ANNUALLY, QUARTERLY_FEB, QUARTERLY_MAR

Registration conditions

V2 introduces queryable conditions that define relationships between registrations:

Condition type	Description
`PREREQUISITE_REGISTRATION`	At least one of the listed registrations must be active before you can create this registration
`MUTUALLY_EXCLUSIVE`	You cannot hold this registration if any of the listed registrations are active
`MUTUALLY_EXCLUSIVE_WITH_MSI`	Blocks the registration only in the specific member state country you select
`MEMBER_COUNTRY_TO_REGISTER_THROUGH`	You must choose a member country to register through (for Non-Union OSS, IOSS)

Use the Registration Conditions endpoint to query these before creating a registration.

Registration workflow

Step 1: Discover available jurisdictions

Use the Available Jurisdictions endpoint to find jurisdictions where you can register:

curl --request POST \
  --url 'https://transaction-tax.api.in.commenda.io/api/v1/registrations/v2/content/available-jurisdictions' \
  --header 'Authorization: Bearer <your_token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "filters": {
      "countries": ["US"],
      "types": ["STATE_OR_PROVINCE"]
    },
    "limit": 50
  }'

Step 2: Get registration options

Use the Available Registrations endpoint to get registration_tax_type_id, tax types, and frequencies:

curl --request POST \
  --url 'https://transaction-tax.api.in.commenda.io/api/v1/registrations/v2/content/available-registrations' \
  --header 'Authorization: Bearer <your_token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "jurisdiction_ids": ["JUR_US_STATE_CA"]
  }'

Step 3: Check conditions (if applicable)

For trade bloc or international registrations, check conditions before creating:

curl --request POST \
  --url 'https://transaction-tax.api.in.commenda.io/api/v1/registrations/v2/content/registration-conditions' \
  --header 'Authorization: Bearer <your_token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "registration_tax_type_id": "REG_TRADEBLOC_EU_3000_UOSS_VAT"
  }'

Step 4: Get portal credential requirements

Use the Portal Fields endpoint to understand what credentials are needed:

curl --request POST \
  --url 'https://transaction-tax.api.in.commenda.io/api/v1/registrations/v2/content/portal-fields' \
  --header 'Authorization: Bearer <your_token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "portal_ids": ["PORTAL_CA_CDTFA"]
  }'

Step 5: Create the registration

Use the Create Registration endpoint:

curl --request POST \
  --url 'https://transaction-tax.api.in.commenda.io/api/v1/registrations/v2' \
  --header 'Authorization: Bearer <your_token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "corporation_id": "550e8400-e29b-41d4-a716-446655440000",
    "registration_tax_type_id": "REG_STATE_CEN_06_RST",
    "tax_types": ["RST", "DTT"],
    "frequencies": ["QUARTERLY"],
    "effective_start_date": "2024-01-01"
  }'

EU trade bloc registrations

V2 provides full support for EU One-Stop Shop (OSS) and Import One-Stop Shop (IOSS) registration schemes with automated establishment validation.

Supported schemes

Scheme	Registration tax type ID pattern	Requirements
Union OSS	`REG_TRADEBLOC_EU_3000_UOSS_VAT`	Qualifying EU establishment in the member state country
Non-Union OSS	`REG_TRADEBLOC_EU_3000_NUOSS_VAT`	No qualifying EU establishment in any EU country
IOSS	`REG_TRADEBLOC_EU_3000_IOSS_VAT`	For imports of goods valued under €150

Union OSS example

# Create a Union OSS registration linked to a German domestic registration
curl --request POST \
  --url 'https://transaction-tax.api.in.commenda.io/api/v1/registrations/v2' \
  --header 'Authorization: Bearer <your_token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "corporation_id": "550e8400-e29b-41d4-a716-446655440000",
    "registration_tax_type_id": "REG_TRADEBLOC_EU_3000_UOSS_VAT",
    "tax_types": ["VAT"],
    "frequencies": ["QUARTERLY"],
    "member_state_registration_id": "<german_domestic_registration_uuid>"
  }'

The member_state_registration_id must reference an active domestic registration in an EU country where your business has a qualifying establishment (headquarters, branch office, warehouse, factory, retail location, or dependent agent).

Non-Union OSS example

# Create a Non-Union OSS registration through a member country
curl --request POST \
  --url 'https://transaction-tax.api.in.commenda.io/api/v1/registrations/v2' \
  --header 'Authorization: Bearer <your_token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "corporation_id": "550e8400-e29b-41d4-a716-446655440000",
    "registration_tax_type_id": "REG_TRADEBLOC_EU_3000_NUOSS_VAT",
    "tax_types": ["VAT"],
    "frequencies": ["QUARTERLY"],
    "registered_through_registration_tax_type_id": "REG_COUNTRY_DE_3001_VAT"
  }'

Non-Union OSS registration is blocked if your business has any qualifying EU establishment. This is validated automatically when you create the registration.

Registration lifecycle

Status fields

Field	Description	Values
`validation_status`	Whether Commenda has verified your registration	`PENDING`, `VALID`, `INVALID`
`registration_status`	Current stage of the registration	`PENDING`, `ACTIVE`, and others

Managing registrations

Update — Modify tax types, frequencies, credentials, or other fields
Close — Set an effective end date when you stop operating in a jurisdiction
Archive — Soft-delete a registration (excluded from calculations and default list views)
Delete — Permanently remove a registration (only allowed when validation_status is not VALID)

Sample registration object

{
  "id": "7c9e6679-7425-40de-944b-e07fc1f90ae7",
  "corporation_id": "550e8400-e29b-41d4-a716-446655440000",
  "registration_tax_type_id": "REG_STATE_CEN_06_RST",
  "tax_types": ["RST", "DTT"],
  "frequencies": ["QUARTERLY"],
  "jurisdiction_id": "JUR_US_STATE_CA",
  "jurisdiction_name": "California",
  "jurisdiction_type": "STATE_OR_PROVINCE",
  "registration_name": "Sales and Use Tax",
  "effective_start_date": "2024-01-01",
  "registered_by": "COMMENDA",
  "registration_status": "PENDING",
  "validation_status": "PENDING",
  "created_at": "2024-01-15T10:30:00Z"
}

API endpoints

Registration content (discovery)

Endpoint	Method	Description
`/registrations/v2/content/available-jurisdictions`	POST	Search for available jurisdictions
`/registrations/v2/content/available-registrations`	POST	Get registration options for jurisdictions
`/registrations/v2/content/registration-conditions`	POST	Get conditions for a registration type
`/registrations/v2/content/portal-fields`	POST	Get portal credential requirements
`/registrations/v2/content/tax-type-details`	POST	Get tax type descriptions

Registration management

Endpoint	Method	Description
`/registrations/v2`	POST	Create a new registration
`/registrations/v2/list`	POST	List registrations with filters
`/registrations/v2/{id}`	GET	Get a single registration
`/registrations/v2/{id}`	POST	Update a registration
`/registrations/v2/{id}`	DELETE	Delete a registration

Registration lifecycle

Endpoint	Method	Description
`/registrations/v2/{id}/archive`	POST	Archive a registration
`/registrations/v2/{id}/close`	POST	Close a registration
`/registrations/v2/credentials/by-portal/{portal_id}`	GET	Look up credentials by portal

Getting started

Global Indirect Tax

Corporations

Tax Calculations

Transactions

Address Requirements

Registration Thresholds

Products

Customers

Exemption Certificates

Exemptions

Files

Filings

Address Requirements

Webhooks

CommendaOS

Company Name Checker

Incorporation

Workflow Builder

MCP Server

Form Builder

Address API

Incident Response SOP

Integration Guidelines

​Overview

​What’s different from V1

​Key concepts

​Registration tax type IDs

​Composite tax types

​Composite filing frequencies

​Registration conditions

​Registration workflow

​Step 1: Discover available jurisdictions

​Step 2: Get registration options

​Step 3: Check conditions (if applicable)

​Step 4: Get portal credential requirements

​Step 5: Create the registration

​EU trade bloc registrations

​Supported schemes

​Union OSS example

​Non-Union OSS example

​Registration lifecycle

​Status fields

​Managing registrations

​Sample registration object

​API endpoints

​Registration content (discovery)

​Registration management

​Registration lifecycle

Overview

What’s different from V1

Key concepts

Registration tax type IDs

Composite tax types

Composite filing frequencies

Registration conditions

Registration workflow

Step 1: Discover available jurisdictions

Step 2: Get registration options

Step 3: Check conditions (if applicable)

Step 4: Get portal credential requirements

Step 5: Create the registration

EU trade bloc registrations

Supported schemes

Union OSS example

Non-Union OSS example

Registration lifecycle

Status fields

Managing registrations

Sample registration object

API endpoints

Registration content (discovery)

Registration management

Registration lifecycle