On an NHAI EPC highway contract, the mobilisation advance bond secures the advance the Authority pays you to get to site — and it can now be an Insurance Surety Bond (ISB) instead of a bank guarantee. NHAI allowed this from 13 June 2023, then widened the permission under Policy Circular No. 3.1.41/2025 dated 2 January 2025, extending it to existing contracts. Because the advance is the heaviest guarantee a contractor carries, this is where the switch frees the most blocked capital.
Below: what the bond actually secures, the NHAI circular history that made the Insurance Surety Bond option real, and the working-capital case for using one.
In one line: An NHAI mobilisation advance bond guarantees the Authority will recover the mobilisation advance it released to the contractor — and since the 13 Jun 2023 NHAI circular (now superseded by 3.1.41/2025 dated 2 Jan 2025), that bond can be an IRDAI-backed surety bond rather than a cash-margined bank guarantee.
What a mobilisation advance bond actually secures
On a large EPC package, NHAI releases a mobilisation advance early — funds to move plant, set up site and get work moving before billing catches up. Because that money goes out before anything is certified, the Authority takes security equal to the advance, recoverable from your running bills. That security is the advance payment / mobilisation bond: take the advance and then fail to perform or to repay through deductions, and the Authority invokes the bond to recover the unadjusted balance.
It sits alongside the bid security and the performance security on the same contract — but it is usually the largest single guarantee obligation of the three, because the advance can run to a meaningful percentage of a contract worth hundreds of crores. So this is where a cash-margined bank guarantee hurts most, and where an ISB releases the most working capital. The mobilisation advance bond is one of the six bond types the IRDAI guidelines recognise — see our contractor’s guide to performance, advance and retention bonds and the Insurance Surety Bonds pillar for the full set.
The NHAI circular history (origin → current)
Two NHAI policy circulars matter. The first opened the door; the second is the one to cite today.
| Date | Circular | What it did |
|---|---|---|
| 13 Jun 2023 | NHAI Policy Circular No. 18.88/2023 | Origin. Allowed ISBs (and e-Bank Guarantees) as bid security and performance security across EPC, HAM and BOT (Toll) standard bidding documents — and crucially for mobilisation advance in EPC contracts. |
| 2 Jan 2025 | NHAI Policy Circular No. 3.1.41/2025 | Current. Superseded 18.88/2023; re-issued and widened the ISB-for-mobilisation-advance permission, applying it to existing contracts too, and aligned with MoRTH and DoE/GFR. |
In parallel, MoRTH amended its standard RFP and Model Concession Agreement (MCA) documents for EPC, HAM and BOT (Toll) so tender wording itself accepts ISBs. And the demand-side basis sits above NHAI: the Ministry of Finance amended GFR 2017 Rule 170(i) (bid security) and Rule 171(i) (performance security) to place ISBs on par with bank guarantees for Government of India procurement.
Most content out there still cites only the 13 June 2023 circular. The operative instrument now is 3.1.41/2025 (2 Jan 2025) — confirm your specific tender or contract references the current NHAI formats, because its annexures are the ones that govern mobilisation advance today.
How fast adoption has moved — the hard number
The strongest, primary-sourced marker of how real this has become is from NHAI itself. By July 2025, Insurance Surety Bonds issued for NHAI contracts crossed ₹10,369 crore — around 1,600 bonds as bid security plus 207 as performance security, from 12 insurers (PIB / MoRTH press release, 11 September 2025). That is a government statistic, not an industry estimate.
Broader market-size figures of roughly ₹60,000 crore issued across all sectors are industry estimates (axiTrust whitepaper, Nov 2025) rather than official data — useful for context, but the NHAI ₹10,369 crore figure is the one to anchor on for highways. We track the wider market in The Surety Bond Market in India (2026).
Why the mobilisation advance bond is the high-value switch
A large advance means a large guarantee — and under a bank guarantee, a large guarantee is a large block of dead capital. The bank holds cash margin or an FDR lien (commonly 10–25%, sometimes far more), and the full bond value consumes your non-fund-based limits — the very limits you need for your next bid. A surety bond carries little or no cash margin (it is secured by a counter-indemnity, not a deposit) and does not touch your banking limits.
| Mobilisation advance via Bank Guarantee | Via Insurance Surety Bond | |
|---|---|---|
| Cash margin / FDR locked | ~10–25%+ of bond value | Nil — secured by counter-indemnity |
| Non-fund bank limit consumed | Yes — full bond value | No — limit stays free for the next bid |
| Annual cost | BG commission + opportunity cost of locked margin | Premium ~0.5–3% p.a. (indicative, underwritten case-by-case) |
| Working capital | Blocked through the recovery period | Released back into the mobilisation |
| NHAI acceptance (EPC) | Standard | On par, since 3.1.41/2025 (origin 18.88/2023) |
Figures are illustrative; actual margin, commission and premium depend on your bank, insurer, rating and the contract. We size it precisely for your package.
The wedge in one sentence: on a mobilisation advance running into tens of crores, a contractor stops blocking crores in FDR margin and instead expenses a premium — keeping that cash, and the bank limit, free to fund the very mobilisation the advance was meant to support. A clean external credit rating directly lowers that premium, which is why credit rating advisory and surety advisory often run together.
What you sign, and one legal nuance
A surety bond does not need your cash, but it does need your counter-indemnity — the agreement under which the insurer recovers from you (and often the promoters) if it pays a valid claim. This replaces the bank’s FDR lien as the insurer’s security.
One technical point worth knowing on highways work: an ISB is a conditional contract of insurance regulated by IRDAI, not an on-demand banking instrument regulated by RBI. It is commercially substitutable for a BG but legally distinct — not “legally equivalent.” Unlike a bank’s on-demand BG, the insurer assesses the validity of a claim before paying. And under the Insolvency and Bankruptcy Code, 2016, a surety insurer’s recovery ranks as an operational creditor, not a financial one — which is exactly why insurers underwrite to your credit profile, and why an underwriting-ready file gets you a cheaper, faster bond. If you already hold a mobilisation-advance BG on a live contract, the live-BG switch playbook shows how to swap it without your security lapsing, and the surety vs bank guarantee comparison sets out the full side-by-side.
FAQ
Does NHAI accept a surety bond for mobilisation advance in EPC contracts? Yes. NHAI first permitted Insurance Surety Bonds for mobilisation advance in EPC contracts via Policy Circular No. 18.88/2023 dated 13 June 2023, since superseded by Policy Circular No. 3.1.41/2025 dated 2 January 2025, which widened the permission to existing contracts. Always confirm your specific tender or contract references the current NHAI formats and security clause.
Which NHAI circular is current for surety bonds in 2026? Cite NHAI Policy Circular No. 3.1.41/2025 dated 2 January 2025 as the current instrument. It re-issued and widened the earlier 13 June 2023 circular (No. 18.88/2023), extending the surety-bond-for-mobilisation-advance permission to existing contracts and aligning with MoRTH and the GFR. The 13 June 2023 circular is the origin, not the live rule.
How much margin does a mobilisation advance surety bond need? Typically little or none. Instead of a cash deposit or FDR lien against the advance, the insurer relies on a counter-indemnity signed by the contractor (and often the promoters). Because the mobilisation advance is usually the largest guarantee on an EPC package, this is where an ISB frees the most blocked working capital compared with a bank guarantee.
What does a mobilisation advance surety bond cost? Premiums are indicative at around 0.5–3% per annum, underwritten case-by-case on your credit profile, financials, work-on-hand, the bond tenor and project risk — with little or no cash margin. A bank guarantee charges commission plus the opportunity cost of the margin it locks. We obtain firm quotes from shortlisted IRDAI-licensed insurers for your specific package.
Can I switch an existing mobilisation-advance bank guarantee to a surety bond mid-contract? Often, yes. Circular 3.1.41/2025 extends NHAI’s surety-bond permission to existing contracts, so you can request the swap mid-package. The rule that protects you: the new ISB must be issued and formally accepted before the old BG is cancelled, so your security never lapses and the FDR margin is released only once the replacement is in place.
Carrying a mobilisation advance on a live NHAI EPC contract? See the Insurance Surety Bonds service or talk to Finnova — CA- and ex-banker-led, insurer-agnostic across IRDAI-licensed surety insurers. Part of Finnova’s ₹4,250 Cr+ mobilised across 100+ corporate-finance mandates since 2011.
Working on something in this area? Get a straight read from a partner.
Book a consultation →