Switch Off Need For Tax ID/VAT in Invoice For Company

I have just had this issue again and come back to the topic.

I missed this before:
In your tax rates, what setting do you have for "Methods to validate that the customer is a business (B2) for this tax" ?

I now have
'No Business customers discrimination by this tax rate'

Does this mean that nothing is checked? I have just completed a transaction that dod have the issue and, set to this, it is now gone!

VAT is only used for business tax calculation as far as I'm aware so if you don't have any tax rules applying specifically to businesses it shouldn't validate it since the validation is done by the tax rule. In your case yes setting "No Business customers discrimination by this tax rate" should work fine.

thanks.