Remove all taxes in WooCommerce for a min cart total and specific countries
The hook woocommerce_before_calculate_totals is just for cart items and the tax class here only apply to products as $cart_item['data'] is the WC_Product Object.
If your product prices are set without taxes, there is another alternative much more simpler that will remove all taxes when your conditions are met.
Try the following instead:
add_action( 'woocommerce_calculate_totals', 'set_customer_tax_exempt' );function set_customer_tax_exempt( $cart ) { if ( is_admin() && ! defined('DOING_AJAX') ) return; $min_amount = 150; // Minimal cart amount $countries = array('GB'); // Defined countries array $subtotal = floatval( $cart->cart_contents_total ); $shipping = floatval( $cart->shipping_total ); $fees = floatval( $cart->fee_total ); $total = $subtotal + $shipping + $fees; // cart total (without taxes including shipping and fees) $country = WC()->customer->get_shipping_country(); $country = empty($country) ? WC()->customer->get_billing_country() : $country; $vat_exempt = WC()->customer->is_vat_exempt(); $condition = in_array( $country, $countries ) && $total >= $min_amount; if ( $condition && ! $vat_exempt ) { WC()->customer->set_is_vat_exempt( true ); // Set customer tax exempt } elseif ( ! $condition && $vat_exempt ) { WC()->customer->set_is_vat_exempt( false ); // Remove customer tax exempt }}add_action( 'woocommerce_thankyou', 'remove_customer_tax_exempt' );function remove_customer_tax_exempt( $order_id ) { if ( WC()->customer->is_vat_exempt() ) { WC()->customer->set_is_vat_exempt( false ); }}Code goes in functions.php file of the active child theme (or active theme). Tested and works.
Thanks to LoicTheAztec help I made some changes ended up using the following and it worked to fix the UK taxes issues
add_action( 'woocommerce_before_calculate_totals','auto_add_tax_for_room', 10, 1 );function auto_add_tax_for_room( $cart ) { if ( is_admin() && ! defined('DOING_AJAX') ) return; $shipping_country = WC()->customer->get_shipping_country(); $subtotal = 0; foreach ( WC()->cart->get_cart() as $cart_item ) { $subtotal += $cart_item['data']->get_price('edit') * $cart_item['quantity']; } $subtotal = intval($subtotal); if($shipping_country!='GB' || $subtotal < 125) return; $percent = 0; // Calculation $surcharge = ( $cart->cart_contents_total + $cart->shipping_total ) * $percent / 100; // Add the fee (tax third argument disabled: false) foreach ( $cart->get_cart() as $cart_item ) { // get product price $price = $cart_item['data']->get_price(); $cart_item['data']->set_tax_class( 'Zero rate' ); } return;}function flat_rates_cost( $rates, $package ) { $shipping_country = WC()->customer->get_shipping_country(); $subtotal = 0; foreach ( WC()->cart->get_cart() as $cart_item ) { $subtotal += $cart_item['data']->get_price('edit') * $cart_item['quantity']; } $subtotal = intval($subtotal); if($shipping_country!='GB' || $subtotal < 125) return $rates; foreach ( $rates as $rate_key => $rate ){ if ( 'free_shipping' !== $rate->method_id ) { $has_taxes = false; $taxes = []; // Taxes rate cost (if enabled) foreach ($rates[$rate_key]->taxes as $key => $tax){ if( $tax > 0 ){ $has_taxes = true; $taxes[$key] = 0; // Set to 0 (zero) } } if( $has_taxes ) $rates[$rate_key]->taxes = 0; } } return $rates;}add_filter( 'woocommerce_package_rates', 'flat_rates_cost', 10, 2 );