---
schema_version: "1"
id: 12c20e0af8a5da9904f68bb0dd5aa5be3e5157dfec10678f26406ce545428716
title: Extend the Revenue Cloud Tax Extension Engine
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/ind/264-0-0/billing_extend_tax_interface.md
canonical_url: https://help.salesforce.com/s/articleView?id=ind.billing_extend_tax_interface.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: e2cd6ec978eb4a6c96c7747179e86480877ef46fdcb5e57727a474562413b6fe
description: Enhance the existing tax interface by mapping additional fields for tax callouts. Use custom metadata types to send additional data in tax requests and persist more detailed information from tax responses.
products:
  - Revenue Cloud
release: "264"
---
# Extend the Revenue Cloud Tax Extension Engine

Enhance the existing tax interface by mapping additional fields for tax callouts. Use custom metadata types to send additional data in tax requests and persist more detailed information from tax responses.

### Required Editions

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small edition"><colgroup><col></colgroup><tbody><tr class=""><td class="slds-cell-wrap" style="vertical-align:top;">Available in: Lightning Experience</td></tr><tr class=""><td class="slds-cell-wrap" style="vertical-align:top;">Available in: <strong>Enterprise</strong>, <strong>Unlimited</strong>, and <strong>Developer</strong> Editions with <a href="https://help.salesforce.com/s/articleView?id=ind.revenue_licenses_areas_and_features.htm&amp;release=264.0.0&amp;type=5">the Revenue Cloud Advanced license or the Revenue Cloud Billing license</a></td></tr></tbody></table>

- **[Tax Interface Extension](https://help.salesforce.com/s/articleView?id=ind.billing_understand_tax_interface_extension.htm&release=264.0.0&type=5)**  
    Handle tax calculation needs that go beyond standard integrations, capture the right data for audits, and adapt to new requirements through configuration instead of custom code.
- **[Configure Your Custom Metadata Types](https://help.salesforce.com/s/articleView?id=ind.billing_custom_metadata_types_configure.htm&release=264.0.0&type=5)**  
    Create a custom metadata type to house your field mappings. These field mappings are required for all the additional fields you want to include in your tax callouts. Associate your custom metadata type with your tax engine provider so it's aware of the fields used in the request and response.