Adding VAT to WooCommerce

functions.php

/*****************************  FRONTEND  ****************************************/

/**************************
Filter to add a VAT field to:

- My Account - Edit Form -- Billing fields
- Checkout - Edit Form - Billing Fields

This function is also reordering the form fields

Source:  https://docs.woothemes.com/document/tutorial-customising-checkout-fields-using-actions-and-filters
***************************/
function add_woocommerce_billing_fields($billing_fields){

	//reorder woo my billing address form fields
	$billing_fields2['billing_first_name'] = $billing_fields['billing_first_name'];
	$billing_fields2['billing_last_name'] = $billing_fields['billing_last_name'];
 
	$billing_fields2['billing_vat'] = array(
		'type' => 'text',
		'label' =>  __('VAT number',  'keyelp-shop-customization' ),
		'class' => array('form-row-wide'),
		'required' => false,
		'clear' => true
	);
	
	//unimos el resto de campos 
	$merged_billing_fields =  $billing_fields2 + $billing_fields;

	return $merged_billing_fields;
}
add_filter('woocommerce_billing_fields' , 'add_woocommerce_billing_fields');


/*********
Filters to add VAT when printing billing address on:
- (1) My account  
- (2) Checkout - Order Received (after checkout compeltion), 

+++ Additional filters to format the printed output.

********/

// (1) Printing the Billing Address on My Account
add_filter( 'woocommerce_my_account_my_address_formatted_address', 'custom_my_account_my_address_formatted_address', 10, 3 );
function custom_my_account_my_address_formatted_address( $fields, $customer_id, $type ) {

	if ( $type == 'billing' ) {
		$fields['vat'] = get_user_meta( $customer_id, 'billing_vat', true );
	}

	return $fields;
}

// (2) Checkout -- Order Received (printed after having completed checkout)
add_filter( 'woocommerce_order_formatted_billing_address', 'custom_add_vat_formatted_billing_address', 10, 2 );
function custom_add_vat_formatted_billing_address( $fields, $order ) {
	$fields['vat'] = $order->billing_vat;

	return $fields;
}


// Creating merger VAT variables for printing formatting
add_filter( 'woocommerce_formatted_address_replacements', 'custom_formatted_address_replacements', 10, 2 );
function custom_formatted_address_replacements( $address, $args ) {
	$address['{vat}'] = '';
	$address['{vat_upper}']= '';

	if ( ! empty( $args['vat'] ) ) {
		$address['{vat}'] = $args['vat'];
		$address['{vat_upper}'] = strtoupper($args['vat']);
	}
	return $address;
}

//Defining the Spanish formatting to print the address, including VAT.
add_filter( 'woocommerce_localisation_address_formats', 'custom_localisation_address_format' );
function custom_localisation_address_format( $formats ) {
	$formats['ES'] = "{name}\n{company}\n{vat_upper}\n{address_1}\n{address_2}\n{postcode} {city}\n{state}\n{country}";

	return $formats;
}

/*****************************  ADMIN USER PROFILE PAGE  ****************************************/

/*************** 
Filter to add VAT Customer meta fields (user profile field on the billing address grouping)
*****************/
add_filter( 'woocommerce_customer_meta_fields', 'custom_customer_meta_fields' );
function custom_customer_meta_fields( $fields ) {
	$fields['billing']['fields']['billing_vat'] = array(
		'label'       => __( 'VAT number', 'keyelp-shop-customization' )
	);

	return $fields;
}

/***************************  ADMIN ORDER PAGE  ****************************************/

/*********  
Filter to add VAT to the Edit Form on:  Order --  Admin page
*********/
add_filter( 'woocommerce_admin_billing_fields', 'custom_admin_billing_fields' );
function custom_admin_billing_fields( $fields ) {
	$fields['vat'] = array(
		'label' => __( 'VAT number', 'keyelp-shop-customization' ),
		'show'  => true
	);
	
	return $fields;
}


/**************** 
Filter to copy the VAT field from User meta fields to the Order Admin form (after clicking dedicated button on admin page)
******************/

add_filter( 'woocommerce_found_customer_details', 'custom_found_customer_details' );
function custom_found_customer_details( $customer_data ) {
	$customer_data['billing_vat'] = get_user_meta( $_POST['user_id'], 'billing_vat', true );

	return $customer_data;
}

Hi, I used this code and all seems to be working perfectly first time! Many thanks for providing.
I am just wondering how I can add the string translations as our website uses the Polylang plugin for multilingual purposes, but the strings do not appear in the available strings list for me to add language translations. Can you advise?

Amazing, thank you!

Hello all
The code works good but i have error in error_log

[18-Jun-2020 21:35:46 UTC] billing_vat was called incorrectly. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), do_action('template_redirect'), WP_Hook->do_action, WP_Hook->apply_filters, WC_AJAX::do_wc_ajax, do_action('wc_ajax_checkout'), WP_Hook->do_action, WP_Hook->apply_filters, WC_AJAX::checkout, WC_Checkout->process_checkout, WC_Checkout->process_order_payment, WC_Gateway_COD->process_payment, WC_Order->update_status, WC_Order->save, WC_Order->status_transition, do_action('woocommerce_order_status_pending_to_processing'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Emails::send_transactional_email, do_action_ref_array('woocommerce_order_status_pending_to_processing_notification'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Email_New_Order->trigger, WC_Email->get_content, WC_Email_New_Order->get_content_html, wc_get_template_html, wc_get_template, include('/plugins/woocommerce/templates/emails/admin-new-order.php'), do_action('woocommerce_email_customer_details'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Emails->email_addresses, wc_get_template, include('/plugins/woocommerce/templates/emails/email-addresses.php'), WC_Order->get_formatted_billing_address, apply_filters('woocommerce_order_formatted_billing_address'), WP_Hook->apply_filters, custom_add_vat_formatted_billing_address, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong. This message was added in version 3.0.

How to fix this ? WP is latest version also WC
Thanks
Bill

Hi! Thx for the code!
However, I also have the same error:
[15-Feb-2021 17:50:15 UTC] billing_vat was called incorrectly. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), do_action('template_redirect'), WP_Hook->do_action, WP_Hook->apply_filters, WC_AJAX::do_wc_ajax, do_action('wc_ajax_checkout'), WP_Hook->do_action, WP_Hook->apply_filters, WC_AJAX::checkout, WC_Checkout->process_checkout, WC_Checkout->process_order_payment, WC_Gateway_BACS->process_payment, WC_Order->update_status, WC_Order->save, WC_Order->status_transition, do_action('woocommerce_order_status_pending_to_on-hold'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Emails::send_transactional_email, do_action_ref_array('woocommerce_order_status_pending_to_on-hold_notification'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Email_Customer_On_Hold_Order->trigger, WC_Email->get_content, WC_Email_Customer_On_Hold_Order->get_content_html, wc_get_template_html, wc_get_template, include('/plugins/kadence-woocommerce-email-designer/templates/woo/emails/customer-on-hold-order.php'), do_action('woocommerce_email_customer_details'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Emails->email_addresses, wc_get_template, include('/plugins/kadence-woocommerce-email-designer/templates/woo/emails/email-addresses.php'), WC_Order->get_formatted_billing_address, apply_filters('woocommerce_order_formatted_billing_address'), WP_Hook->apply_filters, njengah_add_vat_formatted_billing_address, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong. This message was added in version 3.0.

Do you have any idea of what it could be? How can I fix this? Thank you so much in advance!

Hello,

I found the solution here about
billing_vat was called incorrectly

add_filter( 'woocommerce_order_formatted_billing_address', 'custom_add_vat_formatted_billing_address', 10, 2 );
function custom_add_vat_formatted_billing_address( $fields, $order ) {
    $fields['vat'] = $order->get_meta('billing_vat');

    return $fields;
}

Hope this will help others :)