protected function query_tax_rates( $args, $count_only = false ) {
		global $wpdb;

		$results = '';

		// Set args
		$args = $this->merge_query_args( $args, array() );

		$query = "
			SELECT tax_rate_id
			FROM {$wpdb->prefix}woocommerce_tax_rates
			WHERE 1 = 1
		";

		// Filter by tax class
		if ( ! empty( $args['tax_rate_class'] ) ) {
			$tax_rate_class = 'standard' !== $args['tax_rate_class'] ? sanitize_title( $args['tax_rate_class'] ) : '';
			$query .= " AND tax_rate_class = '$tax_rate_class'";
		}

		// Order tax rates
		$order_by = ' ORDER BY tax_rate_order';

		// Pagination
		$per_page   = isset( $args['posts_per_page'] ) ? $args['posts_per_page'] : get_option( 'posts_per_page' );
		$offset     = 1 < $args['paged'] ? ( $args['paged'] - 1 ) * $per_page : 0;
		$pagination = sprintf( ' LIMIT %d, %d', $offset, $per_page );

		if ( ! $count_only ) {
			$results = $wpdb->get_results( $query . $order_by . $pagination );
		}

		$wpdb->get_results( $query );
		$headers              = new stdClass;
		$headers->page        = $args['paged'];
		$headers->total       = (int) $wpdb->num_rows;
		$headers->is_single   = $per_page > $headers->total;
		$headers->total_pages = ceil( $headers->total / $per_page );

		return array(
			'results' => $results,
			'headers' => $headers,
		);
	}