---
title: Tax-Proof Coupons for WooCommerce — isla Studio
url: https://isla-stud.io/en/downloads/taxproof-coupons-for-woocommerce/
date: 2026-08-09
---

# Tax-Proof Coupons for WooCommerce

A fixed gross coupon remains a fixed gross coupon
By default, WooCommerce calculates fixed-cart coupons as a net discount before tax. If the entered amount is intended to be a visible gross value, its actual effect may therefore vary depending on the tax rate or tax jurisdiction.
What the plugin changes
In the coupon editor, the plugin adds the “Apply coupon after tax” option for fixed-cart coupons. When enabled, the plugin distributes the gross value across the eligible product lines and converts each portion to the net discount required by WooCommerce using the applicable tax rate.

The visible coupon value remains constant within the currency’s precision.
Mixed tax rates are taken into account for each eligible product line item.
The discount is limited to the eligible gross merchandise value; shipping, fees, and excluded products do not increase this limit.
Gross, net, and tax amounts are saved in the order’s coupon line item.

Compatibility and Limitations
The plugin includes dedicated compatibility paths for Checkout Block, HPOS, WPML/WooCommerce Multilingual, and Germanized Pro/StoreaBill. However, actual functionality depends on versions and store configuration and should be tested with realistic sample orders before production use.
It does not select tax rates, change product prices, or replace any tax or billing engine, and it does not constitute tax or legal advice. Percentage and fixed-product coupons retain WooCommerce’s default behavior.



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