WooCommerce snippets to calculate tax/shipping based on country code.

functions.php

<?php
if ( ! function_exists( 'vk_get_tax_cost_by_country' ) ) {

	/**
	 * Get tax cost by country code.
	 *
	 * @param string $country_code Code of country.
	 * @param int    $total        Cart total.
	 *
	 * @return int  Cost of tax.
	 */
	function vk_get_tax_cost_by_country( $country_code, $total ) {
		$tax_rate = 0;
		$tax      = 0;
		$available_tax_rates = WC_Tax::find_rates( array( 'country' => $country_code ) );

		if ( ! empty( $available_tax_rates ) ) {
			foreach ( $available_tax_rates as $available_tax_rate ) {
				$tax_rate = $available_tax_rate['rate'];
				break;
			}
			$tax = ( $tax_rate / 100 ) * $total;
			$tax = round( $tax, 2 );
		}

		return $tax;
	}
}

if ( ! function_exists( 'vk_get_shipping_cost_by_country' ) ) {

	/**
	 * Get shipping cost by country code.
	 *
	 * @param string $country_code Code of country.
	 * @param int    $quantity     Total cart quantity.
	 *
	 * @return int  Cost of shipping.
	 */
	function vk_get_shipping_cost_by_country( $country_code, $quantity ) {

		$shipping_cost = 0;

		if ( class_exists( 'WC_Shipping_Zones' ) ) {
			$all_zones = WC_Shipping_Zones::get_zones();

			if ( ! empty( $all_zones ) ) {
				foreach ( $all_zones as $zone ) {
					if ( ! empty( $zone['zone_locations'] ) ) {

						foreach ( $zone['zone_locations'] as $code ) {

							if ( $country_code === $code->code ) {

								if ( ! empty( $zone['shipping_methods'] ) ) {
									foreach ( $zone['shipping_methods'] as $flat_rate ) {

										$shipping_cost = str_replace( ' * [qty]', '', $flat_rate->cost );

										if ( strpos( $flat_rate->cost, '[qty]' ) !== false ) {
											$shipping_cost = ( $shipping_cost * $quantity );
										}
										break;
									}
								}
							}
						}
					}
				}
			}
		}

		return $shipping_cost;
	}
}
?>