WooCommerce Subscriptions Tax Retrofit

Requires: WordPress 5.0+, PHP 7.4+, WooCommerce, WooCommerce Subscriptions

Description

WordPress plugin that automatically migrates WooCommerce Subscriptions stored as tax-inclusive (no separated VAT) to a pre-tax + VAT format, while preserving the total price paid by customers.

Typical use case: You just crossed the VAT threshold and need to display VAT on invoices for your existing subscriptions.

Installation

Via the WordPress admin

1. Download the latest release ZIP
2. Go to WordPress Admin → Plugins → Add New → Upload Plugin
3. Select the ZIP file, install and activate

Manual installation

Download and extract into wp-content/plugins/wcs-tax-retrofit/

Via WP-CLI

wp plugin install wcs-tax-retrofit.zip --activate

Usage

Web interface (recommended)

1. Backup: Make a full database backup (NON-NEGOTIABLE)
2. Go to WooCommerce → Tax Retrofit
3. Configure:
   • Tax rate (selected from your WooCommerce tax rates)
   • Cutoff date (automatic detection available)
   • Subscription statuses to process
4. Run a simulation to preview the changes
5. Review the simulation results
6. If everything looks good, run the real migration
7. Export the CSV for your records

WP-CLI (advanced)

# Configuration
wp tax-retrofit config --tax-rate=20 --date-limit=2024-01-01 --tolerance=0.01

# Simulation
wp tax-retrofit simulate

# Simulation with JSON output
wp tax-retrofit simulate --json > simulation.json

# Real migration (AFTER BACKUP!)
wp tax-retrofit migrate --yes-i-have-a-backup

# Progress statistics
wp tax-retrofit stats

# Reset
wp tax-retrofit reset

Available WP-CLI commands:

• config — Display or modify configuration
• simulate — Run a dry-run simulation
• migrate — Execute the real migration
• stats — Display migration statistics
• reset — Reset migration state

Features

Web interface

• Automatic migration of hundreds of subscriptions
• Mandatory simulation before execution
• Support for any tax rate (France, Belgium, Switzerland, etc.)
• Batch processing (100 subscriptions per batch)
• Automatic resume after interruption
• Configurable rounding tolerance
• Detailed WooCommerce logs
• CSV export of all modifications

WP-CLI

• Full command-line support
• Ideal for large databases (no PHP timeout)
• Scriptable and automatable (CI/CD, cron)
• JSON output for parsing

Internationalization

• Multilingual interface (French, English)
• POT file included for new translations (~290 entries)

For developers

• 5 PHP hooks available (4 filters + 1 action)
• Single PHP file (~2300 lines)

Available hooks

The plugin provides 4 filters and 1 action for customization:

// Override the tax rate
add_filter('wc_tax_retrofit_rate', function($rate) {
    return 0.20; // 20%
});

// Set a cutoff date
add_filter('wc_tax_retrofit_date_limit', function($date) {
    return '2024-01-15';
});

// Adjust the rounding tolerance
add_filter('wc_tax_retrofit_tolerance', function($tolerance) {
    return 0.02; // 2 cents
});

// Change which subscription statuses to process
add_filter('wc_tax_retrofit_subscription_statuses', function($statuses) {
    return array('active', 'on-hold'); // Default: active, pending-cancel, on-hold
});

// Intercept results after each batch
add_action('wc_tax_retrofit_after_process', function($stats, $dry_run) {
    if (!empty($stats['tolerance_warnings'])) {
        error_log('Tax Retrofit: ' . count($stats['tolerance_warnings']) . ' warnings');
    }
}, 10, 2);

Translations

The plugin ships with French (fr_FR) and English (en_US).

To create a new translation:

1. Copy languages/wcs-tax-retrofit.pot
2. Open it with Poedit and create a new catalog for your language
3. Translate, save (generates .po + .mo), and place them in languages/

The plugin automatically loads the correct translation based on the WordPress locale.

Warning

MAKE A FULL BACKUP BEFORE USE

This plugin directly modifies your WooCommerce database. Although it has been extensively tested, a backup is ESSENTIAL before any migration.

This plugin is provided "as is", with no warranty and no technical support. Use at your own risk.

WP-CLI recipes

Automated migration

#!/bin/bash
wp tax-retrofit config --tax-rate=20 --date-limit=2024-01-01
RESULT=$(wp tax-retrofit simulate --json)
ERRORS=$(echo $RESULT | jq -r '.errors')

if [ "$ERRORS" -eq 0 ]; then
    wp tax-retrofit migrate --yes-i-have-a-backup --skip-confirm
    echo "Migration completed successfully"
else
    echo "Errors detected, migration cancelled"
    exit 1
fi

Scheduled migration (cron)

0 2 * * * cd /var/www/html && wp tax-retrofit migrate --yes-i-have-a-backup --skip-confirm >> /var/log/tax-retrofit.log 2>&1