whatever.php

<?php
function vtp_install_data() {	
	add_action( 'init', 'vtp_setup_terms', 11 );
}

register_activation_hook( __FILE__, 'vtp_install_data' );

function vtp_setup_terms() {
	if ( ! term_exists( 'Customer', 'account_type' ) ) {
		wp_insert_term( 'Customer',	'account_type');
	}
}

add_action( 'init', 'register_taxonomy_account_type' );

function register_taxonomy_account_type() {

    $labels = array( 
        'name' => _x( 'Account Types', 'account type' ),
        'singular_name' => _x( 'Account Type', 'account type' ),
        'search_items' => _x( 'Search Account Types', 'account type' ),
        'popular_items' => _x( 'Popular Account Types', 'account type' ),
        'all_items' => _x( 'All Account Types', 'account type' ),
        'parent_item' => _x( 'Parent Account Type', 'account type' ),
        'parent_item_colon' => _x( 'Parent Account Type:', 'account type' ),
        'edit_item' => _x( 'Edit Account Type', 'account type' ),
        'update_item' => _x( 'Update Account Type', 'account type' ),
        'add_new_item' => _x( 'Add New Account Type', 'account type' ),
        'new_item_name' => _x( 'New Account Type Name', 'account type' ),
        'separate_items_with_commas' => _x( 'Separate account types with commas', 'account type' ),
        'add_or_remove_items' => _x( 'Add or remove account types', 'account type' ),
        'choose_from_most_used' => _x( 'Choose from the most used account types', 'account type' ),
        'menu_name' => _x( 'Account Types', 'account type' ),
    );

    $args = array( 
        'labels' => $labels,
        'public' => true,
        'show_in_nav_menus' => true,
        'show_ui' => true,
        'show_tagcloud' => false,
        'hierarchical' => true,

        'rewrite' => true,
        'query_var' => true
    );

    register_taxonomy( 'account_type', array('Accounts'), $args );
    
}