[Frontend Snippets][Add a surcharge to cart and checkout] Add a surcharge based on the delivery country

wc-delivery-counrty-surcharge.php

/**
 * Add a 1% surcharge to your cart / checkout based on delivery country
 * Taxes, shipping costs and order subtotal are all included in the surcharge amount
 */
add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_surcharge' );
function woocommerce_custom_surcharge() {
  global $woocommerce;
 
	if ( is_admin() && ! defined( 'DOING_AJAX' ) )
		return;

 	$county 	= array('US');
	$percentage 	= 0.01;

	if ( in_array( $woocommerce->customer->get_shipping_country(), $county ) ) :
		$surcharge = ( $woocommerce->cart->cart_contents_total + $woocommerce->cart->shipping_total ) * $percentage;
		$woocommerce->cart->add_fee( 'Surcharge', $surcharge, true, '' );
	endif;
 
}

Good morning @woogists,

I'm currently using this code with an additional plugin (pricebasedcountry.com) to show Canadian users the CAD $ pricing and then convert back to USD with a -0.25 percentage. I know that the tax is calculated on the Subtotal of the items in the cart, but I was wondering if there's a way to apply (or modify) this code to have the original tax shown on the Cart & Checkout Page?

My main goal is to show everything in CAD $ pricing on the Cart/Checkout review section and then have the USD $ pricing pushed shown as the Final Total (and sent to Authorize.net). See the attached screenshot.

I thought maybe there might be a way to re-add the 'discounted' percentage back into the Tax, but I'm not sure if WooCommerce has a hook to manipulate the tax calculation.

Any help would be much appreciated!