Use this snippet to make the Cart Total, Cart Subtotal, Order Total, and Package Total conditions ignore tax.

csp-conditions-excl-tax.php

<?php
/**
 * Plugin Name: WooCommerce Conditional Shipping and Payments - Customize conditions to exclude tax.
 * Plugin URI: https://woocommerce.com/products/conditional-shipping-and-payments/
 * Description: Use this snippet to make the Cart Total, Cart Subtotal, Order Total, and Package Total conditions ignore tax.
 * Version: 1.0
 * Author: WooCommerce
 * Author URI: https://woocommerce.com/
 * Developer: Jason Kytros
 *
 *
 * Copyright: © 2021 Automattic
 * License: GNU General Public License v3.0
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 */

add_filter( 'woocommerce_csp_cart_total_condition_incl_tax', '__return_false' );
add_filter( 'woocommerce_csp_cart_subtotal_condition_incl_tax', '__return_false' );
add_filter( 'woocommerce_csp_package_total_condition_incl_tax', '__return_false' );
add_filter( 'woocommerce_csp_order_total_condition_incl_contents_tax', '__return_false' );