Validation of UK VAT ID in SAP

[SAPSupport]

Dear SAP Support Team,

We need your assistance in understanding the SAP source link/portal which is used to check if a particular UK VAT ID is valid or invalid.

Kindly help us understand how the validation for UK VAT IDs is performed in the SAP system.

Thanks in advance!

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[SAPSupport · Accepted solution]

Hello,

The validation of the VAT registration number is based on:

For the 9-digit scheme, the 2-digit block containing the 8th and 9th digits is always in the range 00 to 96 and is derived from a weighted modulus-97 check number (an identical algorithm is used for the 12-digit scheme, ignoring the extra 3-digit block) 

The current modulus-97 series ran out during 2010, so a parallel series of numbers was introduced from November 2009 for new registrations, restarting at 100 nnnn nn and following the same format but with the last two digits derived from an alternative algorithm known as "9755".

The algorithm is identical to the one for the established series except that 55 is subtracted to give the check number (modulus 97), so the check number is either 55 less than or (if this would be negative) 42 greater than the check number that a VAT number in the established series would have if it were identical in the first seven digits.  

Best regards,

Agnes