WooCommerce - Hide price suffix when product is not taxable.

functions.php

<?php // Do not include this if already open!

/**
 * Code goes in theme functions.php.
 */
add_filter( 'woocommerce_get_price_suffix', 'custom_woocommerce_get_price_suffix', 10, 2 );

function custom_woocommerce_get_price_suffix( $price_display_suffix, $product ) {
  if ( ! $product->is_taxable() ) {
    return '';
  }
  return $price_display_suffix;
}

!is_taxable () does not work if you need to hide tax suffix for other reasons, like a geo located country. In the UK we show a VAT suffix but in US we would not, but because the product is still set to is_taxable when still in the US, even if tax returns as 0, the tax suffix shows. So I hide it if the tax rate is 0.

So this is what I am using, seems to work:

function custom_woocommerce_get_price_suffix( $price_display_suffix, $product )
{
	$tax = new WC_Tax(); 
	$taxes = $tax->get_rates($product->get_tax_class());
	$rates = array_shift($taxes);
	$item_rate = round(array_shift($rates));

	if ( $item_rate == 0  )
	{
		return '';
	}
	return $price_display_suffix;
}
add_filter( 'woocommerce_get_price_suffix', 'custom_woocommerce_get_price_suffix', 10, 2 );

All code does not work.