Make taxable a WooCommerce custom fee based on payment gateway and country

This code adds a fee of 29 when PayPal is selected on checkout page for a defined country. However, it's not being taxed. The total tax right now is based on items + shipping.

How would I go about to add tax to the custom fee without double taxing people?

This is my code:

function woocommerce_custom_fee( ) {
    global $woocommerce;

    $county = array('SE');
    if ( ( is_admin() && ! defined( 'DOING_AJAX' ) ) || ! is_checkout() )
        return;

    $chosen_gateway = $woocommerce->session->chosen_payment_method ;

    $fee = 29;


    if ( $chosen_gateway == 'paypal' and ( in_array( WC()->customer->get_shipping_country(), $county ) )  ) { //test with paypal method
        $woocommerce->cart->add_fee( 'Paypal Avgift', $fee, false, '' );    
    }
}
add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_fee' );
function cart_update_script() {
    if (is_checkout()) :
    ?>
    <script>
        jQuery( function( $ ) {

            // woocommerce_params is required to continue, ensure the object exists
            if ( typeof woocommerce_params === 'undefined' ) {
                return false;
            }

            $checkout_form = $( 'form.checkout' );

            $checkout_form.on( 'change', 'input[name="payment_method"]', function() {
                    $checkout_form.trigger( 'update' );
            });


        });
    </script>
    <?php
    endif;
}
add_action( 'wp_footer', 'cart_update_script', 999 );

Thanks