---
title: "About Per Line Tax Configuration"
slug: "about-per-line-tax-configuration"
updated: 2026-08-10T20:22:58Z
published: 2026-08-10T20:22:58Z
canonical: "help.idibilling.com/about-per-line-tax-configuration"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.idibilling.com/llms.txt
> Use this file to discover all available pages before exploring further.

# About Per Line Tax Configuration

The Per-Line Tax Configuration tab is only displayed for tax classes that qualify for per-line taxes, which are local and VoIP. By default, taxes are applied per line and no configuration is necessary.

Configuration is needed for multi-channel lines, for example, taxing a trunk line as if it were multiple lines.

A PRI, for instance, has a 23/1 split: 23 voice and 1 data.

- By taxing per channel, you can set the voice and data for outbound or inbound for each channel.
- The taxes are then computed by the tax engine on a per channel basis versus for the PRI as a single line.

How it is taxed is based on the configuration in the tax database and the service tax configuration.
- Taxes in the tax database allow for channel taxing, but only if the service per line tax is set up accordingly.
- The per line tax class dropdown shows what items are supported for channel taxing (PBX Trunk, PRI, Centrex and other multi-line channel).