show booking price with tax information

functions.php

<?php

function bkap_show_booking_price_with_tax( $wp_send_json, $product_id ) {

	if ( 'yes' !== get_option( 'woocommerce_calc_taxes' ) ) {
		return $wp_send_json;
	}

	$product_obj = wc_get_product( $product_id );
	$total_price = $wp_send_json['total_price_calculated'];

	$tax_rates = WC_Tax::get_rates( $product_obj->get_tax_class() );

	if ( wc_prices_include_tax() ) {
		$taxes        = WC_Tax::calc_inclusive_tax( $total_price, $tax_rates );
		$included_tax = array_sum( $taxes );

		if ( $included_tax > 0 ) {
			$display_price  = $wp_send_json['bkap_price'];
			$display_price .= ' <small>(' . sprintf( __( 'includes %s tax', 'woocommerce'), wc_price( $included_tax ) ) . ')</small>';

			$wp_send_json['bkap_price'] = $display_price;
		}
	} else {
		$taxes      = WC_Tax::calc_exclusive_tax( $total_price, $tax_rates );
		$tax_amount = array_sum( $taxes );

		if ( $tax_amount > 0 ) {
			$display_price  = $wp_send_json['bkap_price'];
			$display_price .= ' <small>(' . sprintf( __( 'plus %s tax', 'woocommerce' ), wc_price( $tax_amount ) ) . ')</small>';

			$wp_send_json['bkap_price'] = $display_price;
		}
	}

	return $wp_send_json;
}
add_filter( 'bkap_final_price_json_data', 'bkap_show_booking_price_with_tax', 10, 2 );