Add support for Oman TIN

https://www.oecd.org/tax/automatic-exchange/crs-implementation-and-assistance/tax-identification-numbers/Oman-TIN.pdf

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.
https://www.omanobserver.om/article/87104/Main/tax-card-with-unique-number-now-must-for-entities

Online validation:

Using the VATIN on https://www.taxoman.gov.om/portal/web/taxportal/tax-data-validation

VATIN Examples:

Opened #505 adding stdnum.om.vat for the Oman VATIN (the OM + 10-digit VAT/Excise form — 12 chars, no check digit, validated structurally like gh/tin.py). Left out the 7-digit entity "tax card number" since it's an unstructured all-digit sequence; happy to add it or fold both into om/tin.py if you'd prefer.

Add Oman VAT number (VATIN) validation

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Add support for Oman TIN #408

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Add support for Oman TIN #408

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DMZ22 commented on Jul 24, 2026

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