GSTIN regex and its checksum
GSTIN regex
\d{2}[A-Z]{5}\d{4}[A-Z]{1}[A-Z\d]{1}[Z]{1}[A-Z\d]{1}
Format details
- First 2 digits of the GST Number will represent State Code as per the Census (2011).
- Next 10 digits will be same as in the PAN number of the taxpayer.
- First five will be alphabets
- Next four will be numbers
- Last will be check code
- The 13th digit will be the number of registration you take within a state i.e. after 9, A to Z is considered as 10 to 35 .
- 14th digit will be Z by default.
- Last would be the check code.
How to decode the GST CheckSum