protected function get_tax_location( $args = array() ) {
		$tax_based_on = get_option( 'woocommerce_tax_based_on' );

		if ( 'shipping' === $tax_based_on && ! $this->get_shipping_country() ) {
			$tax_based_on = 'billing';
		}

		$args = wp_parse_args(
			$args,
			array(
				'country'  => 'billing' === $tax_based_on ? $this->get_billing_country() : $this->get_shipping_country(),
				'state'    => 'billing' === $tax_based_on ? $this->get_billing_state() : $this->get_shipping_state(),
				'postcode' => 'billing' === $tax_based_on ? $this->get_billing_postcode() : $this->get_shipping_postcode(),
				'city'     => 'billing' === $tax_based_on ? $this->get_billing_city() : $this->get_shipping_city(),
			)
		);

		// Default to base.
		if ( 'base' === $tax_based_on || empty( $args['country'] ) ) {
			$args['country']  = WC()->countries->get_base_country();
			$args['state']    = WC()->countries->get_base_state();
			$args['postcode'] = WC()->countries->get_base_postcode();
			$args['city']     = WC()->countries->get_base_city();
		}

		return apply_filters( 'woocommerce_order_get_tax_location', $args, $this );
	}