[Change tax amount based on billing or shipping address] #woo

change-tax.php

billing_wcj_checkout_field_1

<?php 

add_action('woocommerce_after_checkout_form', function($checkout){
    ?>
    <script type="text/javascript">
	    jQuery(function($){
	        $(document).on('change','#billing_wcj_checkout_field_1',function(){
	            $(document.body).trigger("update_checkout");
	        });
	    });
    </script>
    <?php
});

add_action( 'woocommerce_checkout_update_order_review', 'tilfrisoren_user_tax_exempt_callback', 10, 1 );
function tilfrisoren_user_tax_exempt_callback( $post_data ) {
    parse_str($post_data, $results);
    extract($results);
    $customer = WC()->customer;
    if ( ! empty($billing_wcj_checkout_field_1) && $billing_country === 'NO' && ! $customer->is_vat_exempt() ) {
        $customer->set_is_vat_exempt( true );
    }
    elseif( ! empty($billing_wcj_checkout_field_1) && $billing_country === 'SE' && ! $customer->is_vat_exempt() ){
    	$customer->set_is_vat_exempt( true );
    }
    elseif ( $customer->is_vat_exempt() ){
        $customer->set_is_vat_exempt( false );
    }
}

function tilfrisoren_user_tax_exempt_callback_everywhere($wc_tax_enabled) {
    $cart = WC()->cart;
    $customer = WC()->customer;
    parse_str($post_data);
    if ( ! empty($billing_wcj_checkout_field_1) && $billing_country === 'NO' && ! $customer->is_vat_exempt() ) {
        $wc_tax_enabled = false;
    }
    if ( ! empty($billing_wcj_checkout_field_1) && $billing_country === 'SE' && ! $customer->is_vat_exempt() ) {
        $wc_tax_enabled = false;
    }
    return $wc_tax_enabled;

}
add_filter( 'wc_tax_enabled', 'tilfrisoren_user_tax_exempt_callback_everywhere', 10, 1);