Contact - Having custom fields on invoices and contacts
Ability to add a custom fields to a contact record that is able to be displayed on invoices
Purpose: Ability to include more information that’s unique to customers/business/industry that assist the transaction and relationship between customers

Hi everyone, we thoroughly appreciate your engagement and sharing how custom fields would be advantageous to you here.
With lots of work for 'building on beautiful' underway atm, we want to be honest that custom fields is not planned in the near term.
Some in the idea here, may find the recent addition of Notes that can be added within the Contact Details section of a contacts record useful in being able to record and view specific detail relative to a contact at present - More on this shared here
We'll continue to evaluate the viability of largely voted ideas such as this when there is resource, however this unlikely in the next 12 months.
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Stephen Walker commented
Postal Address and Street Address SHOULD BE CHANGED to Billing Address and Shipping Address with the ability to tick a check box if these are the same address.
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Pam van Muijen commented
This would be extremely helpful for sending International Customs invoices that require EORI and VAT codes. We are using Xero US version, and there is nowhere to put that information.