UK VAT Validator
Online UK corporate VAT validator. Ideal for integration and software QA.
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How does VAT validation work?
Validation checks if the 9-digit string matches the positional weights from 8 to 2 on the first 7 base digits.
If the accumulated weighted sum plus the final two check digits of the VAT is divisible by 97 (or if adding 55 to the sum, it is divisible by 97), the document is valid.