STORE PICKUP carrier must always charge sales tax

[USASat]

I need to modify the cart to always charge sales tax when the client select the  carrier that I created called "STORE PICKUP", I had this code before on a older version, but on the new 1.6.1.17 the cart.php change completely, and I cannot see where I can implement this option.

                    // If pickup at store, set shipping rate to Florida tax

                    if($selected_shipping_id == 182)
                        $product_tax_rate = 6.5;
                    else
                        $product_tax_rate = (float)Tax::getProductTaxRate((int)$product['id_product'], (int)$address_id, $virtual_context);
                   
Please help.
Andre