Insurance Surety Bonds for Multi-Year Infrastructure Projects in India
- Rajeev Chari
- 6 days ago
- 8 min read
TL;DR
A multi-year infrastructure project needs a bond program, not a single bond. Bid, performance, advance payment, and retention money bonds each cover a different phase, and missing one leaves a gap in coverage.
IRDAI caps any single insurance surety bond at 60 months. Standard EPC contracts typically fit; HAM, metro, and large port projects do not and need proactive renewal before the bond lapses.
The financial case for ISBs strengthens the longer the project runs. BG commission compounds every year, but an ISB premium is paid once. On a ₹10 crore guarantee over 5 years, that difference is ₹55 lakh on a single obligation.
NHAI accepts ISBs for bid security, performance security, and mobilisation advance across EPC, HAM, and BOT projects under Policy Circular 3.1.41/2025. Other CPSEs including NTPC, SJVN, NHPC, and GAIL have adopted the same framework.
What Is a Multi-Year Infrastructure Project in India?
A multi-year infrastructure project is any capital works contract where execution spans more than one financial year. In practice, these are projects running 3 to 7 years for construction alone, often longer when a defect liability period or operations phase is included.
Each of these project types requires a structured insurance surety bond program rather than a single instrument, because multiple guarantee obligations arise at different phases of execution.
In India's infrastructure pipeline, these projects take several forms:
Highways and expressways: typically 3 to 4 years for construction, with a 12 to 24-month defect liability period (DLP) after completion
Metro rail systems: 5 to 7 years for civil and systems work
Thermal and renewable power plants: 3 to 5 years
Ports and inland waterways: 4 to 7 years
Irrigation and dam projects: 4 to 6 years
Three delivery models dominate how these projects are contracted:
EPC (Engineering, Procurement, Construction): The contractor takes full turnkey responsibility. The project owner pays against milestones. This is the most common delivery model for highways, power, and industrial projects.
HAM (Hybrid Annuity Model): The government pays 40% of the project cost during construction and the remaining 60% as annuity payments over 15 years post-completion. HAM projects are widely used for NHAI highway development.
BOT (Build-Operate-Transfer): The concessionaire finances and builds the project, operates it for a concession period (typically 25 to 30 years), and transfers it to the government at the end.
Each model carries different security requirements. Understanding which model applies to a specific project is the starting point for structuring the right insurance surety bond program.
Why Multi-Year Infrastructure Projects Need Multiple Surety Bonds
Most contractors encountering insurance surety bonds for the first time assume one bond replaces one bank guarantee. For a short-duration commercial contract, that assumption is correct.
For a large infrastructure project, it isn't. A single project generates multiple guarantee obligations at different stages of execution, each covering a distinct risk. Each of those obligations can be covered by a separate insurance surety bond.
Consider a ₹500 crore EPC highway project. Before a shovel hits the ground, the contractor has already needed a bid security bond. After award, a performance bond is required. When the mobilisation advance is released, an advance payment bond is issued. During execution and into the DLP, a retention money bond replaces withheld amounts.
Four bonds, four phases, one project. The bond program maps directly to the obligation structure the project already requires.
The Four Bonds a Large Infrastructure Project Needs, and When
Phase | Bond Type | Trigger | Typical Value |
Tendering | Bid bond | Submitted with tender | 1 to 2% of contract value |
Post-award | Performance bond | Submitted before work begins | 3 to 10% of contract value |
Mobilisation | Advance payment bond | When mobilisation advance is released | Equal to the advance (10 to 15% of contract) |
Execution and DLP | Retention money bond | During execution or at practical completion | Around 5% of contract value |
Bid bond: Submitted at the tendering stage, the bid bond guarantees that a contractor who wins the tender will not withdraw before signing the contract. The bond lapses once the contract is executed or the bid is rejected. See types of insurance surety bonds in India for a full breakdown.
Performance bond: Issued post-award and held by the project owner through the construction period and DLP. The project owner can invoke the bond if the contractor defaults on their obligations. On a 36-month EPC highway with a 12-month DLP, the total performance bond tenure is 48 months, which sits within the IRDAI 60-month cap.
Advance payment bond: Issued when the project owner releases a mobilisation advance to help the contractor begin work before billing milestones kick in. The advance payment bond protects that advance and typically reduces proportionally as the contractor recovers the advance through billing. NHAI Policy Circular 3.1.41/2025 explicitly covers insurance surety bonds for mobilisation advance in EPC contracts.
Retention money bond: Instead of the project owner withholding a percentage of each payment as retention (typically 5%), the contractor provides a retention money bond for the equivalent amount. The contractor receives full payment immediately; the project owner retains the same level of protection. The bond is released when the owner formally clears retention at the end of the DLP.
Which Infrastructure Projects Exceed the IRDAI 60-Month Surety Bond Limit?
The IRDAI (Surety Insurance Contracts) Guidelines 2022 cap any single insurance surety bond instrument at 60 months, including the construction period, maintenance period, and any extensions.
Here is how that cap maps across common infrastructure project types:
Project Type | Typical Total Duration | Within 60 Months? |
Standard EPC highway | 36 months + 12 months DLP = 48 months | Yes |
Large expressway or elevated corridor | 48 months + 24 months DLP = 72 months | No. Renewal needed. |
HAM highway project | 24 months construction + 15-year annuity | Construction phase: Yes. Annuity: separate structure |
Metro rail | 60 to 84 months construction | Borderline to No |
Thermal power plant | 48 to 60 months | Borderline |
Port or dam project | 72 to 96 months | No. Renewal needed. |
For projects within 60 months, a single performance bond can run from award through the end of the DLP without renewal. For projects that exceed the cap, the contractor must plan for bond renewal before the expiring instrument lapses.
How to Renew a Surety Bond When a Project Exceeds 60 Months
A renewal is not automatic. The contractor must proactively engage the insurer before the existing bond expires.
At renewal, the insurer reassesses the position: project progress, remaining obligations, the contractor's financial standing, and any changes in project scope or timeline. The renewed bond is a fresh instrument covering the remaining obligation for the next period, up to another 60 months.
Two things matter most in managing renewal:
Continuity of coverage: The project owner's security cannot have a gap. The renewed bond must be in place before the existing bond expires. Starting the renewal process at month 48 to 50 of a 60-month bond is the right approach. Waiting until month 58 leaves no margin for underwriting delays.
Project extensions: If the project owner grants a time extension, the extended period pushes the total beyond the original bond tenure. Any extension that breaches the 60-month mark triggers the same renewal requirement. Tracking bond expiry against the live project timeline is part of ongoing bond management on a long project.
For HAM projects specifically, the construction phase insurance surety bond covers the 24-month build period. The 15-year annuity phase is governed by a separate contractual and security framework and does not require a surety bond extension through that period.
How NHAI Accepts ISBs Across EPC, HAM, and BOT Projects
NHAI is the most advanced government entity on insurance surety bond adoption in India. Insurance surety bonds issued for NHAI contracts crossed ₹10,369 crore by July 2025, covering 1,600 bid security bonds and 207 performance bonds, as reported by Indian Infrastructure in July 2026.
NHAI's acceptance framework now covers all three major project types:
EPC projects: ISBs accepted for bid security, performance security, and mobilisation advance under Policy Circular 3.1.41/2025 (January 2, 2025).
HAM projects: ISBs accepted for bid security and performance security for the construction phase.
BOT (Toll) projects: ISBs accepted for bid security and performance security under the June 2023 circular, extended by Policy Circular 3.1.41/2025.
Beyond NHAI, the adoption base across CPSEs has broadened significantly. NTPC, SJVN, NHPC, GAIL, Rail Vikas Nigam, Indian Oil Corporation, BSNL, SAIL, RINL, NMDC, and coal block allottees under the MMDR Act have all incorporated insurance surety bonds into their tendering frameworks. See PSUs accepting insurance surety bonds in India for the full list.
How Much Can Contractors Save by Using Surety Bonds Instead of Bank Guarantees?
The financial advantage of insurance surety bonds over bank guarantees increases with project duration. The reason is structural: a bank guarantee commission is charged annually on the outstanding guarantee value for the entire term. An ISB premium is paid once for the full bond duration.
Worked example: ₹10 crore performance guarantee over 5 years
Instrument | Rate | Total Cost |
Bank guarantee | 1.5% per annum | ₹75 lakh (₹15 lakh × 5 years) |
Insurance surety bond | 2% one-time premium | ₹20 lakh |
Saving | ₹55 lakh on this single obligation |
Now scale that across a full bond program on a ₹500 crore EPC project. Total guarantee value across all four bond types (bid at 1%, performance at 5%, advance payment at 10%, retention at 5%) is approximately ₹105 crore.
BG commission on ₹105 crore at 1.5% per annum over 4 years: approximately ₹6.3 crore
ISB premiums on the same portfolio at an average of 1.8% (one-time): approximately ₹1.9 crore
Saving across the full bond program: approximately ₹4.4 crore
The longer the project, the wider the saving gap. A 5-year project with ISBs costs materially less than the same project secured with bank guarantees, and the banking limits previously consumed by those guarantees are freed entirely.
For a detailed look at premium pricing by bond type, see cost of an insurance surety bond in India. For balance sheet treatment, see insurance surety bond balance sheet.
How axiTrust Helps Infrastructure Contractors Manage Their Bond Program
For multi-year infrastructure projects, managing a single bond in isolation is not the same as managing a bond program. axiTrust structures the full program across phases, rather than handling each bond as a standalone transaction. The platform is a technology and consulting service for insurance surety bonds in India, not a bond issuer.
This means mapping the project's guarantee obligations by phase, coordinating underwriting across bond types, managing renewal timelines before any instrument lapses, and maintaining coverage continuity through project extensions or scope changes. axiTrust draws on CIBIL, NSDL, DPI, and Account Aggregator data to structure applications efficiently across multiple issuances on the same project. axiTrust does not issue or underwrite bonds; all underwriting decisions rest solely with the IRDAI-licensed insurer.
Working on a multi-year infrastructure project? axiTrust can help you identify which surety bonds you need at each stage, plan for tenure and renewal requirements, and evaluate the cost against bank guarantees. Discuss Your Project With axiTrust
Frequently Asked Questions
Can one insurance surety bond cover an entire HAM or BOT project in India?
For the construction phase of a HAM project, a single performance bond can cover the full 24-month build period. The 15-year annuity phase does not require an insurance surety bond extension; it is governed by a separate contractual framework.
If the project is delayed and extends beyond the bond's expiry date, what happens?
The contractor must renew the bond before it lapses. A delay-driven extension that pushes the total beyond 60 months triggers the same renewal process as any other extension; the insurer reassesses the position and issues a fresh instrument for the remaining period.
Does each bond type require separate underwriting?
Generally yes, since each bond covers a different obligation and phase. However, an insurer who has already underwritten the performance bond on a project will typically have most of the information needed to assess the advance payment or retention bond for the same project, making subsequent underwriting faster.
Can a contractor use a mix of bank guarantees and insurance surety bonds on the same project?
Yes. There is no rule requiring all security instruments on a single project to be of the same type. A contractor might use an insurance surety bond for the performance security and a bank guarantee for the advance payment, or vice versa, depending on which instrument is more economical for each obligation.
How does the retention money bond get released at the end of the DLP?
The project owner formally issues a no-objection or retention release notice once the DLP is complete and all defects are addressed. The insurer releases the bond on receipt of that clearance.
