GST Invoice Format for Construction — Free Download for Indian Builders

What is a GST invoice for construction?

A GST tax-invoice is the legal document an Indian construction business issues to its client (or another contractor) to charge for work done or material supplied. Under the CGST/SGST regime, every supply over ₹200 must carry a tax invoice with specific mandatory fields — GSTIN, place of supply, HSN/SAC code, tax rate, tax amount, and HSN-wise summary. The invoice is the basis on which both parties claim input tax credit (ITC).

Construction has unique GST nuances: works contract is 18%, but composite supply for residential under-construction units is 5% (without ITC) or 7.5% in specific categories. Pure material supply (cement, steel) is 18% / 28% depending on item. Getting the rate wrong means GSTR-1 vs GSTR-3B mismatches and notices from the GST department.

When is it used?

Issued at the time of supply — for works contract, that's typically when an RA bill is raised; for material supply, at the time of dispatch. Invoices feed monthly GSTR-1 (sales returns) and counter-party GSTR-2A (input credit). E-invoicing is mandatory for businesses above ₹5 crore turnover.

Mandatory fields in a GST invoice

• 1. Supplier name + address + GSTIN + state code
• 2. Invoice number (sequential, unique per FY)
• 3. Invoice date
• 4. Recipient name + address + GSTIN + state code (Bill-to)
• 5. Ship-to address + state (place of supply)
• 6. HSN / SAC code per line item
• 7. Description, unit, quantity, rate, taxable value
• 8. Tax rate breakup — CGST + SGST (intra-state) or IGST (inter-state) or UTGST
• 9. Total tax + total invoice value
• 10. Amount in words
• 11. Signature / digital signature
• 12. E-invoice IRN + QR code (if applicable)

How to fill — step by step

1. Add header — your name, address, GSTIN, PAN, invoice no., date.
2. Recipient details — Bill-to / Ship-to / GSTIN / state code; place of supply decides intra vs inter-state.
3. Add line items — for works contract use SAC 9954; for materials use specific HSN.
4. Apply correct rate — works contract typically 18%; verify residential rates with your CA.
5. Auto-compute tax — same state: CGST 9% + SGST 9%; cross-state: IGST 18%.
6. Sign + share — print, sign, scan; for >₹5 cr turnover, generate IRN from e-invoice portal.

Common mistakes

• Wrong tax type. Same state but charged IGST = recipient can't claim ITC.
• Missing HSN/SAC. Mandatory above ₹5 crore turnover.
• Wrong rate for residential vs commercial. Check with CA.
• Non-sequential invoice numbers. Department flags this in audits.
• No e-invoice IRN when applicable. Notices follow.

How Site Setu automates this

Site Setu generates CGST/SGST/IGST-compliant invoices, customer quotations and vendor / labour-contractor work orders with line items, T&Cs, signatures and your company logo. Multiple invoice templates ship by default; Enterprise customers can have custom formats set up during onboarding. Clean monthly PDF and spreadsheet exports go straight to your CA. Features · Pricing.