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add_filter( 'woocommerce_package_rates', 'custom_shipping_costs', 20, 2 );
function custom_shipping_costs( $rates, $package ) {
// New shipping cost (can be calculated)
$new_cost = 1000;
$tax_rate = 0.2;
foreach( $rates as $rate_key => $rate ){
// Excluding free shipping methods
if( $rate->method_id != 'free_shipping'){
// Set rate cost
$rates[$rate_key]->cost = $new_cost;
// Set taxes rate cost (if enabled)
$taxes = array();
foreach ($rates[$rate_key]->taxes as $key => $tax){
if( $rates[$rate_key]->taxes[$key] > 0 )
$taxes[$key] = $new_cost * $tax_rate;
}
$rates[$rate_key]->taxes = $taxes;
}
}
return $rates;
}