Woocommerce - Change the transport class if a field is filled at checkout

Question

I am willing to change the tax class (or zero taxes) of a purchase if a certain field is filled at checkout, which would be the State Registration, if the company or individual has state registration will not pay a certain tax, then it will reset. I tried a few ways and unsuccessfully.

One of the things I tried to do was make a woocommerce_product_tax_class:

$checkout = WC()->checkout();
$billing_ie = $checkout->get_value( 'billing_ie' );

if ($billing_ie == '') {
    $tax_class = 'Zero Rate';
}
else {
    $tax_class = 'ICMS';
}

return $tax_class;

If anyone knows any plugin for new rule of state ICMS Brazil also helps me, because that’s what I’m doing.