Structure of your GSTIN

Most of you would have received your 15 digit provisional ID or GSTIN (Goods and Services Tax Identification Number). Under GST, knowing your GSTIN format like the back of your hand is important. It will help you to ensure that your suppliers have quoted your GSTIN correctly in invoices to you, as your input credit is dependent on this. It will also help you to mention your GSTIN correctly in invoices to your customers, as their input credit is dependent on this.
This is a guide to the GSTIN format, which will make it easier for you to remember it.

Explanation
1st 2 digits: This is the state code as per the Indian Census, 2011, as given below:

State code

State

State code

State

01

Jammu & Kashmir

19

West Bengal

02

Himachal Pradesh

20

Jharkhand

03

Punjab

21

Orissa

04

Chandigarh

22

Chhattisgarh

05

Uttarakhand

23

Madhya Pradesh

06

Haryana

24

Gujarat

07

Delhi

25

Daman & Diu

08

Rajasthan

26

Dadra & Nagar Haveli

09

Uttar Pradesh

27

Maharashtra

10

Bihar

28

Andhra Pradesh

11

Sikkim

29

Karnataka

12

Arunachal Pradesh

30

Goa

13

Nagaland

31

Lakshadweep

14

Manipur

32

Kerala

15

Mizoram

33

Tamil Nadu

16

Tripura

34

Puducherry

17

Meghalaya

35

Andaman & Nicobar Islands

18

Assam

36

Telengana

37

Andrapradesh(New)

 
Next 10 digits: This is the PAN of the business entity.
13th digit: This denotes the serial number of registrations the business entity has for business verticals in the state, under the same PAN. It can range from 1-9 for businesses with upto 9 business vertical registrations in the state and for more than 9 registrations, from A-Z. For example, when a business entity gets GSTIN for its 3rd business vertical in the state, this will be 3. When a business entity gets GSTIN for its 13th business vertical in the state, this will be D.
14th digit: This will be ‘Z’ by default.
15th digit: This digit denotes ‘checksum’