function country_based_tax(){

    // Geolocation must be enabled under Woocommerce > Settings > General > Default customer address

    // IP geolocation
    $location = WC_Geolocation::geolocate_ip();

    //Get country code
    $country = $location['country'];

    // Disable woocommerce_adjust_non_base_location_prices for CH country code
    if($country == 'CH') {
        add_filter( 'woocommerce_adjust_non_base_location_prices', '__return_false' );
    }
}

add_action( 'init', 'country_based_tax' );