Show WooCommerce prices with or without tax / VAT depending on user profile / option

woocommerce_show_prices_with_or_without_tax.php

<?php

/* WooCommerce prices shown with or without tax depending on client type */
add_filter( 'option_woocommerce_tax_display_shop', 'woocommerce_show_prices_with_or_without_tax' );
add_filter( 'option_woocommerce_tax_display_cart', 'woocommerce_show_prices_with_or_without_tax' );
function woocommerce_show_prices_with_or_without_tax( $option ) {
	if ( is_user_logged_in() ) {
		//Client type from user_meta or profile or whatever...
		//Example: $client_hide_tax = get_user_meta( get_current_user_id(), 'client_type', true ) ? true : false;
		//Example to create this field on registration: https://gist.github.com/webdados/c8dbbe7ccdea3463312e5b865ad92d92
		$client_hide_tax = true;
		return $client_hide_tax ? 'excl' : $option;
	} else {
		/* Assumes "Display prices in the shop" and "Display prices during cart and checkout" is set to "Including tax" in WooCommerce > Settings > Tax */
		return $option;
	}
}