Magento – Same tax rate for multiple countries

If I understand you correctly you want to highlight what taxes are applied on cart totals.

What configuration did you have setup System>Configuration>Sales>Tax

Shopping Cart Display Settings and option:

Include Tax In Grand Total [STORE VIEW] Yes
Display Full Tax Summary [STORE VIEW] Yes

The name that's being displayed in frontend cart totals, are in Sales>Tax>Manage Tax Zone & Rates, then you edit the rate and at the bottom there are Tax Titles for each Store View.

If i understand you in a bad way - then do you want to display tax rate for shipping cost on estimated shipping cost block?

EDIT: Shipping cost tax percentage on cart page

This is kind of a hack, but I think you'll get an idea behind it and you can do whatever you want with it.

Go to /template/checkout/cart/shipping_method/available.html

Find around line ~59:

<?php $_excl = $this->getShippingPrice($_rate->getPrice(), $this->helper('tax')->displayShippingPriceIncludingTax()); ?>
<?php $_incl = $this->getShippingPrice($_rate->getPrice(), true); ?>

Above you can see how's shipping method cost is displayed on frontend. Try to add for testing purposes code like this:

<?php echo $excluding = (float)preg_replace('/\D/', '', $_excl)/100; ?>         
<?php echo $including = (float)preg_replace('/\D/', '', $_incl)/100; ?>         
<?php $taxamount=$including-$excluding;
      $taxPercentage = ($taxamount / 100) * $including;
      $percent = $taxamount/$excluding;
      echo $percent_friendly = number_format( $percent * 100, 2 ) . '%';
?>

Now above the variable $excluding gets estimated shipping cost without tax amount and converts it to float number format. Same goes for $including.

Then we subtract $excluding from $including and we have variable $taxamount which's the tax amount in number format. The rest is obvious I think.

I hope you'll find a better way to implement this solution – it's simplest, baddest hack in template file.

The easiest way to get a list of all country codes is by directly accessing / exporting the data in the 'directory_country' database table if you have access. This lists all countries with both their ISO 2 and ISO 3 codes.

Note: the above is valid for both Magento 1.x and 2.x and as you have not specified I don't want to presume.

I've also created a gist with the output from the table if it helps: https://gist.github.com/johnhughes1984/e749cee0e3713d49dd90ebe9b305858b