GST Invoice Requirements

GST invoice requirements for government contracts are the mandatory standards under the GST Act 2017 that suppliers must follow when raising invoices against central or state government departments, PSUs, and local bodies. Non-compliant invoices delay payment and block input tax credit.

What are GST Invoice Requirements for Government Contracts?

Every payment from a government entity to a supplier requires a valid GST tax invoice. Under the CGST Act 2017 and associated rules, a tax invoice must include the following mandatory fields:

• Supplier's GSTIN and legal name
• Invoice number (sequential, financial year-specific)
• Invoice date
• Recipient's GSTIN and name (the government department's GSTIN)
• Place of supply (state where the supply is made)
• HSN/SAC code for each item (goods: HSN, services: SAC)
• Description, quantity, and value of goods or services
• Taxable value, applicable GST rate, and GST amount (CGST + SGST for intra-state, IGST for inter-state)
• Total invoice value
• Signature or digital signature of the authorised signatory

Special requirements for government contracts:

• GST on works contracts: 12 percent for government works (construction of roads, bridges, buildings for central/state government and local bodies). Composite supply of works treated as services.
• GST on supply contracts: Standard rates (5 to 28 percent depending on commodity). Government departments can claim input tax credit for taxable purchases used in taxable activities.
• Reverse charge mechanism: For certain categories (legal services, sponsorship, import of services), the government buyer pays GST directly under reverse charge. Suppliers must not charge GST in these cases.
• E-invoicing: Mandatory for suppliers with turnover above INR 5 crore since August 2023. See e-invoice for government.

Why GST Invoice Requirements matter for Indian government suppliers

A non-compliant GST invoice, missing GSTIN, wrong HSN code, or incorrect GST rate, will be rejected by the government accounts department and delay payment. Government finance departments are increasingly automated and reject invoices that do not pass GST validation. Moreover, a government buyer cannot claim input tax credit on an invoice where the supplier has not filed GSTR-1 and matched the supply. Ensuring timely and accurate invoice filing keeps the supply chain clean and reduces payment disputes. The gst-government-contracts-reverse-charge-tds blog covers the GST landscape for government suppliers in detail.

Example

A software services firm supplies IT maintenance services to a central ministry. The firm raises a tax invoice with SAC code 998313 at 18 percent GST. The ministry's GSTIN is recorded on the invoice. The ministry pays the base amount after deducting 2 percent TDS on the base (under Section 194C) and pays the GST component separately. The firm files GSTR-1 by the 11th of the following month, and the ministry reconciles the invoice in GSTR-2A/2B before claiming ITC.

Frequently Asked Questions

What GST rate applies to works contracts for government buildings?

Works contracts for construction, repair, or renovation of government buildings attract 12 percent GST (concessional rate under Notification 11/2017-CT(Rate) as amended). This rate applies to central and state government departments and local bodies.

Should the contractor quote prices inclusive or exclusive of GST in the BOQ?

Almost all government BOQs require rates exclusive of GST. GST is paid by the government separately on top of the accepted bid rate. Quoting rates inclusive of GST when the BOQ asks for exclusive rates is a disqualification risk.

What is the GSTIN for central government departments?

Central government departments and ministries use GSTINs starting with 77 (Central Government). State government departments use the state's two-digit code. Suppliers must obtain and verify the correct GSTIN from the procuring department before raising invoices.

Do government departments pay IGST or CGST+SGST?

If the supplier's state and the place of supply are the same (intra-state supply), CGST plus SGST applies. If the supplier is registered in a different state from the place of supply (inter-state), IGST applies. For works contracts executed in a specific state, the place of supply is typically that state.