There structure of TIN may differ depending on type of taxes. For the VAT and Excise Tax, the TIN
consists of 12 alphabetic- numeric characters. However, for entities TIN number is only in numeric
sequence and currently is up to seven-digit sequence.
Either 7 digits, or 12 alphanumeric characters.
My suspicion is that the 12 alphanumeric are OM characters then followed by 10 digits.
This suspicion is kinda confirmed by searching some of the found examples in the online validation page URL listed below.
I also suspect that the 7 digits is called Tax Card Number and the 12 alphanumeric is called VATIN.
This suspicion is also kinda confirmed by searching some of the found examples in the online validation page URL listed below.
Online validation:
VATIN
on https://www.taxoman.gov.om/portal/web/taxportal/tax-data-validationVATIN Examples:
OM1100006083
from https://www.omantel.om/wcm/connect/7041d8b4-9865-4974-9980-97c13a7589e6/VatCertificate.pdf?MOD=AJPERES&CVID=nzr8s9j&CVID=nzr8s9j&CVID=nzr8s9j