Is there a way to display Company EIN and Customer VAT ID on Invoice?

Thank you for posting here in the Community, @neongod. 

I'll provide you with some tips on how to enter your Company EIN and VAT number in your invoices.

You can add your EIN and VAT number to your invoice using QuickBooks Online. You only need to enable a custom field and assign it to your VAT number. Just so you know, each time you make an invoice with QuickBooks Online US, you'd have to manually enter your VAT number. Custom fields are available for Plus and Essentials or Advanced. 

You can follow these steps: 

1. Go to the Gear Icon.
2. Select Custom Form Styles.
3. Find the invoice template you'd be using.
4. From the Action column, select Edit.
5. Click the Content tab.
6. Select the Custom field link.
7. Put a checkmark on one of the Custom field boxes.
8. Enter VAT ID as its name.
9. Hit Done. 

For more information about customizing sales forms, refer to this article: Customize invoices, estimates, and sales receipts in QuickBooks Online.

I'll be sharing these references on how to use the VAT feature and receive payments in QuickBooks: 

• Set up and edit VAT settings, VAT codes, and VAT rates(UK only).
• Record invoice payments in QuickBooks Online. 

If you have any additional inquiries regarding making an invoice in QuickBooks, drop by here. I'm always willing to assist.

Can you also explain the way to add a VAT ID, company registration number, or other identification option for a customer?

Warm welcome, MK12341. I'm here to ensure you can add your customer's VAT ID, company registration number, or other identification.

If you want to add an option wherein your customer can enter their VAT ID, company registration number, or other identification, please know this is currently unavailable. 

On the other hand, if you wish to add these details to distinguish your customer's information, you can include them in their profile notes.

Here's how: 

1. Hover to Sales, then click Customers
2. Double-click your preferred customer and tap Edit.
3. Enter the details in the Notes and attachments section, then hit Save.

I've attached a screenshot for visual reference.

For future reference, you can send customer statements in QuickBooks Online. This feature lets them view their invoices, payments, credits, and balance summaries in one place.

Whenever you need further assistance managing your customer's details, I'm here to back you up. Kindly utilize the reply button below to enter any queries you may have. 

This is pretty poor - showing the customer's VAT number is a legal requirement in much of Europe and the only solution is to have to put it in manually with every invoice created? That's simply not good enough. You literally have a VAT number field in the customer details - the framework is already there to display that on the invoice.