
Lack of knowledge and understanding of GST rules among buyers might lead to receiving unauthentic or inaccurate GST bills from shopkeepers and businesses. Lots of buyers do not pay enough attention to the GSTIN number format of their seller, which creates favorable conditions for imposture.
Difference between trading with registered and unregistered sellers
There can be two types of businesses: registered and unregistered. A GST registered business has a valid GSTIN number while an unregistered business does not have one and does not trade under the GST rules.
A valid GST invoice issued by GST registered sellers has a GSTIN number, a place of supply and a breakdown of the GST rate into CGST and SGST or IGST. Not all taxpayers have to register under GST, businesses with a turnover less than INR 25 lakh are not obligated to do so. This means that the sellers you are doing business with might still be registered under traditional taxation.
When a registered business trades with an unregistered one, the tax liability falls on the registered business. In some cases, unregistered businesses charge GST and do not transfer it to the government, so GST registration tracking is vital. Make sure their GSTIN is genuine by checking it on the government website.
What to do if a seller issues you an old type of invoice?
If you receive an old bill with VAT, TIN or CST number instead of GSTIn but with a breakup of the applicable tax rate into CGST, SGST or IGST, then you can refuse the bill and log a complaint against the seller who practices this. If a business does not display the GSTIN number on the bill then this bill is considered void and it will not be valid. For more clarifications on this, you can directly approach the tax department or go to consumer forums for more details.
What is the GSTIN structure? Know your GSTIN number format
For all registered businesses, issuing invoices with a GSTIN number is mandatory, whether it is a permanent one or a provisional one.

A valid GSTIN has 15 digits and is a unique number across the country. GSTIN is made up of: 2 digits: Each state has a unique code under GST. The first 2 digits of each GSTIN represent the state code of the business. Here is a list of all the state codes:
2-digit State Code |
State Name |
Jammu And Kashmir |
01 |
Himachal Pradesh |
02 |
Punjab |
03 |
Chandigarh |
04 |
Uttarakhand |
05 |
Haryana |
06 |
Delhi |
07 |
Rajasthan |
08 |
Uttar Pradesh |
09 |
Bihar |
10 |
Sikkim |
11 |
Arunachal Pradesh |
12 |
Nagaland |
13 |
Manipur |
14 |
Mizoram |
15 |
Tripura |
16 |
Meghalaya |
17 |
Assam |
18 |
West Bengal |
19 |
Jharkhand |
20 |
Odisha |
21 |
Chattisgarh |
22 |
Madhya Pradesh |
23 |
Gujarat |
24 |
Daman And Diu |
25 |
Dadra And Nagar Haveli |
26 |
Maharashtra |
27 |
Andhra Pradesh |
28 |
Karnataka |
29 |
Goa |
30 |
Lakshadweep Islands |
31 |
Kerala |
32 |
Tamil Nadu |
33 |
Pondicherry |
34 |
Andaman And Nicobar Islands |
35 |
Telangana |
36 |
Andhra Pradesh (New) |
37 |
Next 10-Digits: These represent the 10 digit PAN number of a business or taxpayer;
3th Digit: This is based on the number of registration in a particular state and is assigned accordingly.
14th Digit: Is represented by the letter Z by default;
15th Digit: This is a checksum digit for the tax department’s use. Can be a number or a letter.
GST registration tracking: Check GSTIN for authenticity of GST invoices
Since one of the most important aspects of a GST invoice is having a valid GSTIN number on it, you can make sure your bill is authentic by searching the GSTIN number on the government GST portal. Here’s a step by step guide for doing that:
1. Go to the government portal here and enter the GSTIN number:

2. Enter the captcha and click on the ‘Search’ button:

3. You will get a page display with all the registration details of the company, including registration status and location.

What does the message displayed after searching for GSTIN mean?
Message displayed |
GSTIN status |
The GSTIN / UIN that you have entered is invalid. Please choose a valid GSTIN / UIN |
Invalid GSTIN |
If these details are shown: legal name of business, state, date of registration, private or public ltd company, partnership or sole-proprietor |
Valid GSTIN |
Active pending verification |
Valid GSTIN (Provisional GSTIN issued) |
Taxpayer type |
Regular, composition scheme, UIN holder, TDS deductor etc |
Note: If the taxpayer type shows composition, then the shop owner is not eligible to charge GST from its customers
To see if you were charged at the appropriate GST rate for the goods / services you bought, you can check the GST rate list available from the government https://cbec-gst.gov.in/gst-goods-services-rates.html.