Different tax rates based on the customer role not working for Variable Products

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After WC 3.0 update my condition to apply different tax rates based on a customer role is not working for Variable products.

I took that customization from your official documentation: https://docs.woocommerce.com/document/setting-up-taxes-in-woocommerce/#section-19

Now the filter used: woocommerce_product_tax_class i think it deprecated in favor of woocommerce_product_get_tax_class.

Even with this, these filter triggers for example in cart when a product is single, but when a variable product is in cart, it display tax, as the filter doesn’t trigger.

STEPS TO REPRODUCE THE ISSUE

1- Have 2 products, 1 single, 1 variable. Create Tax for an state, let’s say florida.

2- User this code customization in functions.php: https://docs.woocommerce.com/document/setting-up-taxes-in-woocommerce/#section-19

3- Add single product to cart, see there is no tax being calculated.

4- Add Variable Product to Cart, see there is tax being calculated.

5- Add Both, see that there is tax being calculated only for Variable Product.

Another easy way to test, is an echo on the filter:

function wc_diff_rate_for_user( $tax_class, $product ) {
if ( is_user_logged_in() && current_user_can( “administrator” ) ) {
$tax_class = “Zero Rate”;
}

echo “TAX IS DIFFERENT FOR ADMIN”;

return $tax_class;
}
add_filter( “woocommerce_product_tax_class”, “wc_diff_rate_for_user”, 1, 2 );

You will see that the echo displays only for the single product, not the variable product. An in like the Variable Product doesn’t trigger this filter.