Add Kenya TIN number

[unho]

It is called PIN (Personal Identification Number) and is issued by the KRA (Kenya Revenue Authority).

• https://www.kra.go.ke/individual/individual-pin-registration/learn-about-pin/about-pin
• https://org-id.guide/list/KE-KRA
• https://www.cyber.co.ke/how-to-get-kra-pin-number-certificate-using-kra-portal/
  • According to this it is 11 digits long.
• https://stackoverflow.com/questions/51556967/how-to-preg-match-kra-pin-no
• https://docs.appruve.co/appruve-identity/kenya/verify-kenya-kra-pin
• https://api-docs.dojah.io/docs/lookup-kenya-tin
• https://www.facebook.com/KRACare/posts/personal-identification-number-pin-is-a-number-which-identifies-a-person-for-pur/1110866462257692/
• https://m.facebook.com/KRACare/photos/tip-of-the-day-httpsitaxkragoke/1270332812977722/

Online checker:
https://itax.kra.go.ke/KRA-Portal/pinChecker.htm

Validation code:

• https://gist.github.com/NimzyMaina/c32e6dc0ca9d6b83c6d28e3e25065677

Examples:

• A004416331M
• P051365947M
• P000594434U
• https://dennykinsassociates.com/kra-pin-numbers-for-all-companies-in-kenya/
  • P000619379O
  • P000609147B
  • P000595101M
  • P000594873H
  • P000608609Y
  • P000605255W
  • P000591260N
  • P000591376W
  • P051126254X
  • P000609718Z
  • P000594487J
  • P000599642I
  • P000615147U
  • P000619594P
  • P000608167F
  • P000609671I
  • P000597382L
  • P000598207Z
  • P000596967Q
  • P051099534I
  • P051116151S
  • P000597694S
  • P000597676Q
  • P000591115C
  • P000597819E
  • P051117306P
  • P000615058Y
  • P000608932A
  • P051124533N
  • P051123493Y
  • P051106014G
  • P051102575T
  • P051159129C
  • P051094112J
  • P000592089D
  • P000591575X
  • P000605619R
  • P051120393R
  • P000611519E
  • P051141902D
  • P000604053O
  • P000595728D
  • P051097904C
  • P000592118K
  • P051110833H
  • P000598418B
  • P051132776Z
  • P000592851X
  • P051127959L
  • P000602904I
  • P000598609F
  • P000603130E
  • P051092962C
  • P051100289S
  • P000595362D
  • P000607298L
  • P000592366Z
  • P000593471Z
  • P000593248W
  • P000596998X
  • P000637719Z
  • P000603639S
  • P000598522B
  • P000598224A
  • P000610622O
  • P051098974U
  • P051100248H
  • P051194673F
  • P000592265X
  • P051102426H
  • P000593809V
  • P051151506E
  • P000596373I
  • P051160236J
  • P000602920I
  • P000607322Q
  • P051094227U
  • P000595438C
  • P000607839E
  • P051130656Q
  • P051104242J
  • P051093274B
  • P000597143A
  • P000613824O
  • P000595467J
  • P051147495M
  • P000595273F
  • P051139006S
  • P000605674D
  • P000615432Q
  • P000606270X
  • P000600314X
  • P000595037X
  • P000618428A
  • P000594433T
  • P000598330Z
  • P000599567S
  • P000595108T
  • P051127968M
  • P051153177Y
  • P051170839T
  • P051155350V
  • P051133887F
  • P000591465U
  • P000591400B
  • P000619647H
  • P000609354E
  • P000609363F
  • P000609346C
  • P000593916S
  • P051153543Q
  • P000611951N
  • P000609364G
  • P051099723H
  • P000609367J
  • P000612260M
  • P000609358I
  • P000609355F
  • P000612829R
  • P000609340W
  • P000609370E
  • P051124237Z
  • P000609342Y
  • P000609351B
  • P000609360C
  • P000609361D
  • P000612067R
  • P000609362E
  • P000609344A
  • P051092778I
  • P051099651M
  • P051149832D
  • P000609341X
  • P051141061H
  • P000609237A
  • P000609348E
  • P051097559P
  • P000633040I
  • P000609345B
  • P000609356G
  • P000609357H
  • P051112430E
  • P000609359J
  • P000609365H
  • P000597328D
  • P000629820Z
• https://kicc.co.ke/wp-content/uploads/2021/03/List-of-Suppliers-2020-2021.pdf (dozens of them, listed under the "Pin certificate" (in several tables), "KRA Pin" (in several tables), "Pin Number", "PIN No" (in several tables) columns)
• http://keib.or.ke/wp-content/uploads/2019/03/List-Of-Prequalified-Suppliers-For-Financial-Year-2018-2020-1.pdf (dozens of them)
• https://www.kcaa.or.ke/sites/default/files/tenders/awarded/LIST%20OF%20CONTRACT%20AWARDS%20%20FOR%20GOODS%2C%20WORKS%20AND%20SERVICE%20AWARDED%20IN%20THE%20MONTH%20OF%20FEBRUARY%202021%20%281%29.pdf
• https://infotradekenya.go.ke/media/Registered%20Horticultural%20Exporters%202020%20(1).pdf
• https://www.tum.ac.ke/noticeboard/dl?id=4upjv4uxx6rih
• https://kfcb.go.ke/sites/default/files/2021-10/List%20of%20Registered%20Suppliers%202020-2022.pdf
• https://www.yumpu.com/en/document/view/3301318/large-taxpayers-offic-kenya-revenue-authority

[arthurdejong]

There appears to be some kind of check digit algorithm used for calculating the last letter.

An increase in the last digit by one increases the check digit by one (with a wrap-around):

P000609340W
P000609341X
P000609342Y
P000609344A
P000609345B
P000609346C
P000609348E

I haven't found any examples to the contrary in the set of numbers provided.

However, the influence of the second to last digit is a bit more mysterious:

P000609300O
P000609320S
P000609330U
P000609340W
P000609350A
P000609360C
P000609370E
P000609380G
P000609390I

It increases consistently by 2 characters, except in this case from 4 to 5 it goes from W to A instead of to Y. Another example:

P000609601S
P000609621W
P000609631Y
P000609641A
P000609651E
P000609661G
P000609671I
P000609681K
P000609691M

Again the change from 4 to 5 goes from A to E instead of the expected C.

The third digit from the right seems to affect the check digit the same as the last digit:

P051126154W
P051126254X
P051126354Y
P051126454Z
P051126554A
P051126654B

4th digit has the strange *2 again:

P051092067Y
P051093067A
P051094067C
P051095067G
P051096067I
P051097067K
P051099067O

5th digit seems regular again:

P051902053D
P051912053E
P051922053F
P051932053G

6th digit strange again:

P051399934S
P051599934Y
P051699934A
P051799934C
P051899934E

7th digit seems regular again:

A001395263W
A002395263X
A003395263Y
A004395263Z
A005395263A

The last (first) two digits are pretty difficult to check because I couldn't find consecutive numbers easily (but it is probably safe to assume the pattern repeats). I'm pretty sure an algorithm must be able to constructed from the above but I haven't found the right numbers yet.

Btw, there appear to be a couple of numbers that do not validate the online check (e.gA005109050I, A051320913J, P000610622O, P051099232O, P051550157P and P057170514E).

[unho]

I haven't been able to find any data on this. All sources point to use the online checker https://itax.kra.go.ke/KRA-Portal/pinChecker.htm

[arthurdejong]

I've also been using that online checker (I've been training my math skills ;) ).

I've found a counter-example that more or less makes the existence of an algorithm that is valid for all numbers unlikely:

P051124235M
P051124236N
P051124237Z <- would expect 7O here
P051124238P
P051124239Q

So for now, I'm giving up on finding an actual check digit algorithm and while there probably is one I expect there are a sufficiently large number of numbers that are not generated according to that algorithm.

[unho]

That's sad. But after all I was not expecting here to be a check character, since there was no reference to it, and some countries just assign a sequential number with no check character to prevent typos.

I am happy that at least we can validate the format.