On 1 June 2026, the GST e-invoice framework expanded to include construction and infrastructure service contracts worth ₹5 crore and above in a single financial year. This threshold aligns with the Ministry of Finance's push to digitise invoice generation across high-value project segments.
For infrastructure contractors, civil works vendors, and SPV operators managing multi-phase projects, the rule reshapes invoice timing, ITC (Input Tax Credit) visibility, and cash-flow forecasting. Businesses below the threshold face voluntary adoption; those above it now face mandatory e-invoice filing within 24 hours of supply.
Market signals
The 1 June 2026 GST notification extends e-invoicing to construction and infrastructure services. Contractors billing over ₹5 crore annually must now file invoices through the GST e-invoice portal (IRP) within 24 hours, triggering automatic IRN (Invoice Reference Number) generation and real-time audit trail.
Project-based billing often lags physical delivery by 30–90 days due to milestone disputes and retention clauses. E-invoice compliance now frontloads invoice filing, potentially creating timing gaps between supply, billing and ITC claim windows, pressuring working capital on long-cycle projects.
E-invoice data feeds directly into GSTR-2A (buyer's ITC ledger). Subcontractors and material suppliers must align their e-invoices with the main contractor's input claims, or face ITC denial and cash-flow clawback from principal contractors via cost recovery clauses.
Under the Central Goods and Services Tax Act, 2017, e-invoicing is now non-negotiable for construction contracts ₹5 crore+ annually. Contractors must integrate GST portal APIs into billing systems and synchronise milestone timing with e-invoice filing deadlines. Failure to file within 24 hours may attract late-fee provisions and ITC ineligibility for that fiscal quarter. At Vinayakam Consultants, we help infrastructure businesses audit billing workflows, restructure payment-milestone clauses to align with e-invoice timelines, and train finance teams on IRN reconciliation. We also advise on cost-plus passthrough language in contracts to protect margin when ITC delays occur.
Your action checklist
- Audit your FY 2025–26 billing to identify all construction contracts exceeding ₹5 crore in annual value and flag them for mandatory e-invoice compliance from 1 June 2026 onward.
- Integrate GST e-invoice API credentials into your billing and ERP system; test IRN generation and GSTR-2A auto-population before June month-end to avoid filing delays.
- Revise subcontractor payment terms and principal contractor agreements to require e-invoice filing within 24 hours of delivery and to clarify ITC claim responsibility and retention-clause timing.
- Establish a monthly e-invoice reconciliation checklist: cross-verify IRNs filed with GSTR-2A receipts, flag mismatches with buyers within 5 working days, and monitor ITC eligibility windows to protect cash flow.
Frequently asked questions
From 1 June 2026, construction and infrastructure contractors earning ₹5 crore or above in annual revenue must file GST e-invoices within 24 hours of supply. Businesses below this threshold may adopt voluntarily.
E-invoice compliance frontloads invoice filing, but project billing often lags physical delivery by 30–90 days. This timing gap can delay ITC claims and pressure working capital on long-cycle infrastructure projects.
Misaligned e-invoices between subcontractors and main contractors can result in ITC denial and cash-flow clawback via cost recovery clauses, as all data feeds into GSTR-2A automatically.