U + 8 digits 8 digits + 2 check digits 9–10 digits 11 digits 9 characters - The last character must always be a letter 8-10 digits 8 digits 9 digits 7 digits + check digit 2 characters (as validation key) + 9 digits (as SIREN) 9 digits 9 digits vat.formats.GP 8 digits - 7 digits and one letter, optionally followed by a 'W' for married women<br>-7 digits and two letters 11 digits 11 digits 9 or 12 digits 8 digits 8 digits vat.formats.MQ 9 digits + 'B' + 2-digit company index 10 digits 9 digits vat.formats.RE 10 digits 10 digits 8 digits - 1 letter + 8 digits<br>- 1 letter + 7 digits + 1 letter<br>- 8 digits + 1 letter 12 digits