Woo Discount Rules: Calculate Subtotal with Tax (Inclusive Tax)

// Calculate Subtotal with Tax (Inclusive Tax)
add_filter('advanced_woo_discount_rules_get_cart_subtotal', function($subtotal) {
    if (function_exists('WC')) {
        $subtotal = 0;
        if(isset(WC()->cart) && WC()->cart != null) {
            if (method_exists(WC()->cart, 'get_subtotal')) {
                $subtotal = WC()->cart->get_subtotal();
            } elseif (isset(WC()->cart->subtotal)) {
                $subtotal = WC()->cart->subtotal;
            }
            $tax_type = get_option('woocommerce_prices_include_tax');
            if ($tax_type === 'yes') {
                $tax_total = 0;
                if (method_exists(WC()->cart, 'get_tax_totals')) {
                    $tax_total = WC()->cart->get_subtotal_tax();
                } elseif (isset(WC()->cart->subtotal_tax)) {
                    $tax_total = WC()->cart->subtotal_tax;
                }
                $subtotal = $subtotal + $tax_total;
            }
        }
    }
    return $subtotal;
});