Calculate Tax Based on Shipping Method

Question

How can I charge different tax rates based on the shipping method a customer selects at checkout in Woocommerce? My store has one shipping option that lets international customers avoid the 7% VAT charged here in Thailand.

Here's how to disable taxes when Local Pickup is selected as the shipping option according to Woocommerce documentation:

add_filter( 'woocommerce_apply_base_tax_for_local_pickup', '__return_false' );

But how do I disable taxes on a custom shipping option?

I've started to work out a solution, but I could use some help with line 2. i.e. How to get the current shipping method?

function remove_tax_for_fob( $cart ) {
    $ok_remove = get_shipping_method( 'FOB' );
    if ($ok_remove){ 
        $cart->remove_taxes();
}
return $cart;
} 
add_action( 'woocommerce_calculate_totals', 'remove_tax_for_fob' );

Answer 1

Here is the solution. Thanks for your help, Anand Shah!

/* Remove tax from cart for FOB orders */
function remove_tax_for_fob( $cart ) {
    $chosen_methods = WC()->session->get( 'chosen_shipping_methods' );
    $chosen_shipping = $chosen_methods[0]; 
    if($chosen_shipping =='FOB') {
        $cart->remove_taxes();
    }
    return $cart;
}
add_action( 'woocommerce_calculate_totals', 'remove_tax_for_fob' );