What is the White List
The list of VAT taxpayers is one, electronic and free database of VAT taxpayers. Contains data about taxpayers who:
have been registered as active or exempt VAT taxpayers, have not been registered or have been removed from the register, were reinstated as VAT payers. Information about whether the taxpayer is on the list can be checked on a selected day, which falls no earlier than in the period of 5 years preceding the year in which you check the taxpayer.
HOW S4FN CAN HELP
S4FN provides a solution to check the list by api functions. Or government will publish a text based file which can be downloaded and customer accounts can be checked against.