The Company Law Amendment Directive effective 1 January 2007, states the following information must appear on your website and business emails:

Company registration number
Place of registration
Registered office address

In addition the following information must appear on your website:

The company's place of registration and registered number

The address of its registered office

Name, postal address and email address of the website's service provider.

The name of any trade bodies or professional associations that the business is part of, including membership or registration details.

The Company VAT number, even if the website is not being used for e-commerce transactions.

Any prices on the website must clearly state whether they are inclusive or exclusive of tax and delivery costs .

View further information from the DTI