UIN stands for Unique Identification Number, a special class of GST registration for foreign diplomatic missions and embassies that are not liable to taxes in the Indian territory. Any amount of tax (direct or indirect) collected from such bodies is refunded back to them.
UIN is a 15-digit unique number allotted to any specialized agency of the United Nations Organisation or any multilateral financial institution and organization notified under the United Nations (Privileges and Immunities) Act, 1947, consulate or embassy of foreign countries

What is the purpose of a UIN?
The organization listed above will be granted a Unique Identification Number (UIN). The UIN allows the body to receive a tax refund on inward supplies of goods and services, i.e., purchases.
Who can get GST Unique ID?
The GST Act states that any specialised agency of the United Nations Organisation or any Multilateral Financial Institution and Organisation notified under the United Nations (Privileges and Immunities) Act, 1947, Consulate or Embassy of foreign countries and any other persons notified by the Commissioner can be granted a GST Unique Identity Number. GST Unique Identity Number can be used for the purposes of claiming GST refund on notified supplies of goods or services and other purposes as notified by the GST authorities.
UIN Importance On GST Invoices
The government, in a notice released, has made it compulsory for diplomats and officials of multilateral agencies working in India to mention on their sale invoice/bill the Unique Identity Number (UIN) provided to them.
The order was released in response to the complaints received by the Finance Ministry from foreign diplomats and UN institutions about the vendors and e-commerce sites that were not accepting the 15-digit UIN number while selling taxable goods to them.
The UIN is allotted after a thorough evaluation of the entity. Its first two digits are the State code that represents the location of such entity. It is important for foreign diplomats and UN organisations to get their UIN recorded while purchasing taxable supplies in the country in order to be able to claim a refund of the GST paid on these supplies.
The notice further explains that many big brands of clothing, and groceries, including superstores, are reportedly showing an unwillingness to accept UIN from embassies and consulates. The government has therefore instructed these suppliers must necessarily record the UIN of the embassies and other eligible persons on the tax invoices while making supplies to them.
The government has also informed that the unwillingness to record the UIN on the invoice is a punishable offence under the rules of the Central Goods and Services Tax (CGST). “It may be noted that supply to foreign diplomatic missions/UN organisations is like any other business-to-consumer supply and will not have any additional impact on the supplier’s tax liability,” the statement said.
It further added that the GST Common Portal has the option to Search for UIN details of a particular entity. The facility can be accessed under the ‘Search Taxpayer’ option on the portal.
What is the difference between GSTIN and UIN?
All the regular taxpayers should acquire the Goods and Services Tax Identification Number or the GSTIN to collect and file GST returns. However, the GST department allots Unique Identification Number (UIN) only for a particular set of people as notified under the GST Act. Hence, GSTIN and GST Unique ID are different forms of identification under GST.
How to apply for GST UIN?
As mentioned above, Consulates, Embassies and other specialized agencies can opt to receive GST UIN. The Ministry of Finance grants GST UIN to the above-mentioned institutions. The institutions can opt to apply GSTIN through the Form GST REG-13.
GSTR-11 Filing
All persons registered with UIN should file GSTR-11 returns on a quarterly basis. Based on the GSTR-11 return filing, GST refunds will be processed by the Government. Further, UIN holders will not be allowed to add or modify any details in GSTR-11, only the auto-populated information from GSTR-1 filing can be verified and filed by the GST UIN holder.
FAQs
What returns should be filed by a UIN holder?
Every UIN holder must file GSTR-11 by the 28th of next month to claim a refund of the taxes paid on his inward supplies. GSTR-11 will contain details of such supplies of taxable goods or services. A UIN holder will not be allowed to add or modify any details in GSTR-11 as the information will be auto-populated from the seller’s GSTR-1 (sales).
What should a seller supplying to a UIN holder ensure?
The taxable supplier, i.e., normally registered taxpayer under GST, while supplying to a UIN organization, must:
- Mention the UIN on the invoices
- Treat such sales as supplies to another registered person (B2B)
The sellers of UIN holders should upload invoices in the same manner as for normal B2B sales.
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