WordPress at a glance
filter is not described

woocommerce_base_tax_rates filter-hook . WC 1.0

Get's an array of matching rates for the shop's base country.

Usage

add_filter( 'woocommerce_base_tax_rates', 'filter_function_name_6193' );
function filter_function_name_6193( $tax_class ){
	// filter...

	return $tax_class;
}
$tax_class
-

Where the hook is called

WC_Tax::get_base_tax_rates()
woocommerce_base_tax_rates
woocommerce/includes/class-wc-tax.php 524-536
return apply_filters(
	'woocommerce_base_tax_rates',
	self::find_rates(
		array(
			'country'   => WC()->countries->get_base_country(),
			'state'     => WC()->countries->get_base_state(),
			'postcode'  => WC()->countries->get_base_postcode(),
			'city'      => WC()->countries->get_base_city(),
			'tax_class' => $tax_class,
		)
	),
	$tax_class
);

Where in WP core the hook is used WooCommerce

Usage not found.