When reading the Wikipedia page on Belgian VAT id numbers, it seems there should be 10 digits?
The one with 9 digits is old.

https://en.wikipedia.org/wiki/VAT_identification_number

Yeah the original is technically valid though it will never start with a 1 though.

I agree with updating it according spec which is clear i guess?

BE
0,2,3,4,5,6,7,8,9
7 random digits
2 check digits mod97

@bram-pkg Yes. This code generates a 10 digit vat number. '0' + 7 digit random number + 2 digit mod97, which is 10 digits total.

@pimjansen The Wikipedia page is not completely clear. The At this time no numbers starting with "1" are issued part means the first digit is always 0. In theory this could be 0-9 but no vat numbers are issued starting with a number other than 0.

@bram-pkg Yes. This code generates a 10 digit vat number. '0' + 7 digit random number + 2 digit mod97, which is 10 digits total.

My bad, I missed the 0 in your sprintf call.

Thanks!

I'm just gonna leave this here for later.

Dear Madam, Sir,

As you know, every entity is assigned an enterprise number (unique identification number) when it is registered in the Crossroads Bank for Enterprises (CBE).

The structure of the enterprise number has been established by Royal Decree[4] and takes the form ZNNN.NNN.NNN, the first digit being either 0 or 1.

We currently use numbers starting with 0: “0.xxx.xxx.xxx” (0-series). However, the 0-series is not infinite. Once this series is exhausted, enterprise numbers will be assigned with the first number being 1: “1.xxx.xxx.xxx” (1-series).

Today there are still 183,600 enterprise numbers of the 0-series available. We estimate that at least 140,000 enterprise numbers beginning with “0” will be used up in the coming year. However, new projects (such as SABE – “loading of foreign entities”) may cause the 0-series to be used up faster than expected and thus more quickly numbers from the 1-series will be put into use.