In some parts of the world you will need to add VAT to a commission that you provide a vendor. The following code snippet will add a 16% VAT to the vendor commission.
<?php
// Add 16% VAT to vendor commission
// Change the 0.16 $vat_fee amount to the VAT you require
add_filter( 'wcv_commission_rate', 'my_wcv_commission_rate', 10, 5 );
function my_wcv_commission_rate( $commission, $product_id, $product_price, $order, $qty ) {
$vat_fee = 0.16;
$marketplace_split = $product_price - $commission;
$vat = $marketplace_split * $vat_fee;
$commission -= $vat;
// if there is a negative number then make it 0;
if ( $commission < 0 ) $commission = 0;
// Round commission so it doesn't break gateways
$commission = round( $commission, 2 );
// Return commission
return $commission;
}