EPC Surety Bonds for EPC (Engineering, Procurement & Construction) in India
TL;DR
EPC stands for Engineering, Procurement, and Construction. Unlike standard works contracts, a single EPC contract can require up to four separate bonds running at the same time.
The four bonds are bid security, performance security, advance payment bond, and retention money bond. Each covers a different stage of the contract lifecycle.
When all four are bank guarantees, the contractor's NFB limit is consumed and cash margin is blocked on each instrument simultaneously. On a ₹50 crore contract, this can lock ₹11 crore or more in bank security before the project earns anything.
NHAI Circular 3.1.41/2025 and Circular 11.84/2026 formally accept insurance surety bonds for all four instruments on EPC and highway contracts. The baseline performance security for NHAI EPC projects is now 3% of bid price.
Switching even two of the four bonds to the ISB route eliminates cash margin on those instruments and frees up banking headroom for working capital and new bids. This is the single biggest lever available to EPC contractors looking to scale their order book.
Assume a common scenario.
An EPC contractor wins a ₹50 crore highway contract with NHAI. By the time the project reaches mobilisation stage, the contractor has four simultaneous financial security obligations running: a bid bond required at tendering, a performance security bond submitted at contract award, an advance payment bond covering the mobilisation advance, and a retention money bond covering the Defect Liability Period ahead.
If all four are bank guarantees, the contractor has four instruments drawing from the same NFB credit limit, with cash margin locked on each. The project hasn't billed a single running account yet.
The surety bond route for EPC contracts changes this. No cash margin. No NFB impact. A one-time premium per bond. Since February 2022, IRDAI-licensed insurers have been able to issue all four bond types as insurance surety bonds, legally at par with bank guarantees under GFR Rule 171(i).
This article covers four things: what each bond in the EPC stack does, what the cumulative cost looks like under both routes, what NHAI's 2025 and 2026 circulars changed, and how to qualify.
What Is an EPC Contract?
EPC stands for Engineering, Procurement, and Construction. Under an EPC contract, a single contractor takes full responsibility for designing the project, procuring all materials and equipment, and completing construction, on a fixed price and a fixed timeline.
This is different from a standard item-rate works contract, where the project owner specifies every input and the contractor only executes. In an EPC contract, the contractor owns the design risk, the procurement risk, and the execution risk. The project owner gets a finished asset.
EPC contracts dominate India's large infrastructure pipeline: national highways under NHAI, power transmission lines, gas pipelines, port terminals, and large water and irrigation projects. Contract values typically run from ₹50 crore to several thousand crore. The financial security requirements reflect that scale.
The Four Bonds an EPC Contract Requires
A standard EPC contract doesn't require one bond. It requires up to four, each covering a different stage and a different risk.
Bid security is required at the tendering stage, before award. It protects the project owner if the contractor wins the bid and then withdraws. Bid security is typically 1 to 2% of the estimated contract value and is returned to unsuccessful bidders and to the winning contractor once performance security is submitted.
Performance security is required at contract award, before the work order is issued. It protects the project owner if the contractor fails to complete the project as specified. Under GFR Rule 171(i), performance security is 3 to 10% of contract value for works contracts. For NHAI EPC projects specifically, Circular 11.84/2026 sets the baseline at 3% of bid price.
The advance payment bond, also called the mobilisation advance bond, covers the advance the project owner releases to fund early site work and equipment procurement. Mobilisation advances in Indian EPC contracts typically run from 5 to 15% of contract value. The bond must equal the full advance amount, and under CPWD, 110% of the advance. It's a reducing bond: as the owner recovers the advance through deductions from running bills, the bond value falls proportionally and is extinguished when the advance is fully recovered.
The retention money bond covers the Defect Liability Period after project completion. Project owners typically withhold 5% of each running bill as retention money, released at DLP expiry. A retention money bond allows the contractor to receive those withheld amounts upfront against a bond guarantee, keeping cash flowing during execution.
The Problem: All Four Running at Once
The issue isn't the cost of any single bond. The issue is that all four can be running simultaneously on the same contract, drawing from the same banking limit.
Here's what the security stack looks like at peak on a ₹50 crore EPC contract:
Bond | Basis | Approximate Amount |
Bid security | 2% of estimated value | ₹1 crore |
Performance security | 5% of contract value (bank guarantee route) | ₹2.5 crore |
Advance payment bond | 10% mobilisation advance | ₹5 crore |
Retention money bond | 5% of contract value | ₹2.5 crore |
Total NFB limit consumed | ₹11 crore |
All four instruments draw from the contractor's non-fund-based credit limit at the same time. The bank also requires cash margin on each, typically 10 to 30% of face value. On ₹11 crore in bank guarantees, that's ₹1.1 crore to ₹3.3 crore locked in fixed deposits earning nothing, before a single running bill is raised.
For a mid-sized EPC contractor with a total NFB limit of ₹15 to ₹20 crore, one large contract can absorb most of the available headroom. Taking on a second contract, or even bidding for one, becomes difficult. This is why most mid-sized EPC contractors in India struggle to scale their order book beyond two or three simultaneous projects regardless of their execution capability.
What Changed: NHAI Circulars 2025 and 2026
NHAI has been the most active government body in formalising ISB acceptance for EPC contracts, through two specific circulars.
NHAI Policy Circular 3.1.41/2025, dated January 2, 2025, explicitly accepts insurance surety bonds for mobilisation advance security in EPC and HAM contracts. This was the first NHAI circular to extend ISB acceptance to the advance payment instrument, beyond bid and performance security.
NHAI Policy Circular 11.84/2026, dated February 13, 2026, went further. It formalised ISBs as valid instruments for bid security and performance security across EPC, O&M, and Non-Regular Civil Works contracts sanctioned at the NHAI level. Three significant changes came with it.
First, the baseline performance security for NHAI-level EPC works is now 3% of bid price, down from the 5 to 10% range under the standard GFR framework. This directly reduces the performance security obligation on large contracts.
Second, the circular introduced a two-tier Additional Performance Security formula for abnormally low bids. For bids priced more than 15% but up to 25% below the estimated cost, APS is calculated at 50% of the difference between the quoted price and the 15% threshold. For bids more than 25% below, APS is a fixed 5% of estimated cost plus 100% of the difference beyond the 25% mark. APS forms part of performance security and is enforced on the same basis.
Third, all ISBs submitted must be issued by IRDAI-authorised insurers and verified through NHAI's designated online portal. Third-party performance security arrangements are barred.
The ISB Route: What It Costs Across the Full Stack
The ISB route replaces cash margin and NFB limit consumption with a one-time premium per bond. Here's the same ₹50 crore contract under the ISB route:
Bond | Amount | ISB Premium Range |
Bid security | ₹1 crore | ₹5,000 to ₹10,000 |
Performance security | ₹1.5 crore (3% NHAI baseline) | ₹15,000 to ₹45,000 |
Advance payment bond | ₹5 crore | ₹25,000 to ₹75,000 |
Retention money bond | ₹2.5 crore | ₹12,500 to ₹37,500 |
Total premium (approximate) | ₹57,500 to ₹1.67 lakh |
Premiums are indicative ranges. Actual rates vary by insurer, contractor profile, and contract type.
No cash margin. No NFB limit consumed. The ₹11 crore that would have been locked in bank guarantees stays in working capital.
Bank Guarantee Route | ISB Route | |
NFB limit consumed | ₹11 crore | Zero |
Cash margin blocked | ₹1.1 to ₹3.3 crore | Zero |
Annual fee per instrument | 0.75 to 1.25% per annum each | Not applicable |
Total premium | Not applicable | ₹57,500 to ₹1.67 lakh (one-time, per bond) |
Working capital freed | Zero | ₹11 crore |
New contract bidding capacity | Severely restricted | Preserved |
For a full breakdown of ISB costs across different contract sizes and bond types, see the insurance surety bond cost guide for India.
HAM Contracts: How the Security Structure Differs
HAM stands for Hybrid Annuity Model. It's a variant of EPC used primarily for national highway projects where the government contributes 40% of the project cost as annuity payments during construction, and the remaining 60% is financed by the contractor through debt and equity.
The bond structure under HAM is broadly similar to EPC: bid security, performance security, and advance payment security apply on the same basis. The key difference is that HAM contracts have a more complex payment structure, with annuity payments continuing through the operations period, which can affect the validity and release timeline of certain security instruments.
NHAI Circular 3.1.41/2025 explicitly includes HAM contracts in its ISB acceptance framework alongside EPC contracts. For bond issuance and eligibility purposes, HAM contractors are assessed on the same criteria as EPC contractors.
How to Qualify for ISBs as an EPC Contractor
Surety underwriting for EPC contractors follows the same principles as for other contractors, but the scale of assessment is different. What insurers look for:
Three or more completed EPC or large works contracts, with no default or termination.
Audited financials for the last two to three years, with positive net worth and debt serviceability.
A new contract no more than 2 to 3 times the size of the contractor's largest completed project.
A clean banking history, even if NFB limits are near exhaustion.
ROC filings, GST returns, and company registration documents in order.
One important distinction for EPC contractors: insurers assess each bond type separately. Qualifying for a bid security bond doesn't automatically qualify a contractor for a performance security bond on the same contract. The advance payment bond and retention money bond are assessed based on the contractor's track record with similar-scale contracts.
Assessment is done digitally. Financial records, ROC data, legal filings, and banking information are pulled into structured underwriting inputs. For a standard MSME EPC contractor, this typically takes 5 to 10 working days.
How axiTrust Fits In
axiTrust is the technology and consulting platform that connects EPC contractors to IRDAI-licensed insurers for all four bond types.
It pulls financial records, ROC data, legal filings, and banking information into structured underwriting inputs for the insurer, replacing the manual documentation process that delays bank guarantee applications by days or weeks.
It provides digital bond verification, so a procurement officer at NHAI, CPWD, or any PSU can confirm bond validity without chasing paper instruments.
axiTrust does not underwrite or issue bonds. All underwriting decisions rest with the licensed insurer.
The Bottom Line
A single EPC contract can require up to four bonds running simultaneously. Under the bank guarantee route, that means four instruments consuming the same NFB limit, with cash margin locked on each. For a ₹50 crore contract, ₹11 crore or more can be tied up in security before the first running bill is raised.
The ISB route replaces that with a one-time premium per bond, no cash margin, and no NFB impact. NHAI's 2025 and 2026 circulars have made the position explicit for EPC and HAM contracts.
Talk to an axiTrust consultant to evaluate the ISB route for your next EPC contract.
FAQs
Can an EPC contractor use insurance surety bonds for all four bond types on the same contract?
Yes, if the procurement authority accepts ISBs and the contractor qualifies with the insurer for each instrument. NHAI's 2026 circular explicitly accepts ISBs for bid security, performance security, and mobilisation advance.
Does switching to ISBs affect the contractor's relationship with the bank?
No. ISBs are issued by IRDAI-licensed insurers, not banks. They don't appear in the contractor's credit facilities and don't affect the banking relationship.
Can a contractor use a bank guarantee for performance security and an ISB for the advance payment bond on the same contract?
Yes. The choice of instrument can be made separately for each bond type, subject to the procurement authority's acceptance and the insurer's eligibility assessment.
What happens to the advance payment bond if the mobilisation advance isn't fully recovered before the contract ends?
The project owner can invoke the bond for the unrecovered portion. The insurer pays, and a separate recovery process follows.
Is APS (Additional Performance Security) under NHAI Circular 11.84/2026 also issuable as an ISB?
Yes. APS forms part of performance security under the circular, and ISBs are accepted for performance security on the same basis.
