ASBA (Application Supported by Blocked Amount)

ASBA (Application Supported by Blocked Amount) is the SEBI-mandated payment mechanism for Initial Public Offering (IPO) and other public issue applications in India, under which the application amount is blocked (held as a lien) in the applicant’s own bank account rather than debited and transferred to the issuer. The blocked amount earns savings interest throughout the subscription and allotment period; only the portion corresponding to the value of allotted shares is ultimately debited. Unsuccessful applications result in immediate and automatic release of the lien, with no refund delay. ASBA was introduced by SEBI by circular dated 30 July 2008, effective for public issues opening on or after 1 September 2008, and was made the sole route for retail investors in book-built issues from 1 January 2016.

As of mid-2026, ASBA operates through two parallel channels: UPI ASBA (the broker-mediated route using a UPI mandate, available to retail individual investors) and bank ASBA via NetBanking (the bank-direct route using the NetBanking portal of a Self Certified Syndicate Bank, available to all investor categories including NIIs, QIBs, and NRIs). This article covers ASBA as the umbrella concept; the two implementation channels are covered in their dedicated articles.

History

The pre-2008 cheque-and-refund regime

Before ASBA, applying for an Indian IPO meant submitting a physical application form together with a cheque or demand draft for the full application amount. The bank cleared the cheque regardless of whether the applicant received an allotment; refunds (for unsuccessful or partially successful applicants) were then issued by the registrar by post, often taking two to four weeks. The period from bid submission to fund return could run to 21 days in large issues, during which the applicant’s capital was tied up and earning no return. Reconciliation errors and lost cheques added to the burden. The Reliance Power IPO of January 2008, then the largest Indian IPO by application volume, generated widespread complaints about refund delays, directly accelerating SEBI’s timeline for introducing ASBA.

SEBI circular of 30 July 2008

SEBI’s circular SEBI/CFD/DIL/DIP/31/2008/30/7 introduced ASBA as an optional route for investors in book-built issues. Under ASBA, the investor authorised a SEBI-designated Self Certified Syndicate Bank (SCSB) to block the application amount in the investor’s own account. The SCSB certified to SEBI that it would block the amount, forward the application to the exchange/registrar, and release or debit the amount on allotment instructions. The circular specified the role of SCSBs, the process for blocking and releasing funds, and the SEBI eligibility requirements for an SCSB.

Mandatory ASBA from 2016

SEBI circular CIR/CFD/POLICYCELL/11/2015 dated 10 November 2015 made ASBA the sole route for retail investors in book-built issues from 1 January 2016. Cheque-and-refund applications for mainboard IPOs were no longer accepted after that date. The mandatory shift eliminated the largest source of investor grievance in the primary market, refund delays, and substantially reduced the operational burden on issuers, lead managers, and registrars.

UPI extension (2018-2019)

SEBI circular SEBI/HO/CFD/DIL2/CIR/P/2018/138 dated 1 November 2018 extended ASBA to a new technical implementation: the UPI mandate. Under UPI ASBA, retail investors applying through a stockbroker (rather than through a bank branch or NetBanking portal) could authorise the block via a UPI PIN on their mobile phone, without visiting a bank. Phase II of the UPI ASBA rollout (July 2019) made the broker-mediated UPI route the exclusive channel for retail investors applying through intermediaries. The UPI mandate cap was raised progressively from ₹1,00,000 to ₹2,00,000 (2019), then to ₹5,00,000 (December 2021), and further to ₹5,00,000 per transaction with a ₹10,00,000 daily cumulative (September 2025).

The ASBA mechanism: core principles

Regardless of whether ASBA is implemented through UPI or through the SCSB NetBanking route, the following principles are constant:

1. No debit at application. The investor’s account is debited only to the extent of shares allotted, and only after the registrar issues the allotment instruction on T+2. The application amount is blocked (held as a lien), not transferred.

2. Interest continuity. The blocked amount continues to be part of the investor’s account balance for interest-accrual purposes. A savings account earns interest on the book balance including the blocked portion, throughout the subscription and allotment period.

3. Automatic release. Unsuccessful applicants do not need to request a refund; the SCSB releases the lien automatically on receipt of the registrar’s release instruction on T+2. This makes refunds instantaneous rather than requiring the registrar to issue refund cheques or NEFT credits.

4. Single-route constraint. An investor may not make two ASBA applications for the same issue in the same investor category from the same PAN. The registrar’s third-party verification catches duplicate PAN applications and rejects them; both the duplicate and potentially the original may be rejected.

5. SCSB as intermediary. The SCSB is the legal counterparty to the ASBA obligation; it certifies to SEBI that the amount is blocked and is responsible for managing the lien in compliance with SEBI guidelines. A bank must apply to SEBI to be designated an SCSB; the current list is published on the SEBI website.

Two channels of ASBA

UPI ASBA

The broker-mediated channel, using a UPI mandate. The investor places a bid through a broker’s trading interface (for example, Kite ), enters a UPI ID, and separately approves the mandate on the UPI app. The sponsor bank (designated in the Red Herring Prospectus ) sends the mandate request to the investor’s issuer bank (the bank where the UPI-linked account is held). The investor must approve the mandate before the 5 PM cutoff on the closing day of the subscription. For full details, see UPI ASBA .

UPI ASBA is available only to retail individual investors applying through brokers; the ₹5,00,000 per-transaction UPI mandate cap means that NII applicants (who typically bid above ₹10,00,000) cannot use this channel for their full application.

Bank ASBA via NetBanking

The bank-direct channel, using the investor’s SCSB NetBanking portal. The investor logs into the bank’s NetBanking, navigates to the IPO section, and submits the bid; the bank immediately places a lien on the account without a separate authorisation step. This channel is available to all investor categories, including NIIs, QIBs (via custodians), and NRIs (via NRO/NRE NetBanking). For full details, see bank ASBA NetBanking .

ASBA for non-IPO public issues

While ASBA was introduced primarily for book-built IPOs, SEBI has progressively extended the mechanism to other categories of public issues:

• Rights issues: ASBA is available for rights issue applications, allowing existing shareholders to apply without a separate cheque. The blocked amount is released if the shareholder chooses not to exercise their rights entitlement.
• Non-convertible debenture (NCD) public issues: ASBA is applicable to public issues of NCDs and bonds, including infrastructure bonds and tax-free bonds. The mechanics are identical to equity IPOs.
• Initial Public Offering of units (REIT/InvIT): ASBA applies to the IPO of REIT and InvIT units.

ASBA and the interest-earning advantage: a worked example

Consider an investor applying in a 5-day subscription window for ₹14,700 worth of shares at the upper band. Under the pre-ASBA cheque-based regime, ₹14,700 would have been debited from the investor’s account on Day 1 and the refund (if unsuccessful) might arrive 21 days later. Under ASBA:

• The ₹14,700 remains in the savings account as a blocked amount throughout the subscription and allotment period (typically 5 working days for subscription + 3 working days for allotment = 8 working days total under T+3).
• A savings account earning 3.5% per annum on ₹14,700 earns approximately ₹14.25 for the 8-working-day period. This is a small amount individually but significant in aggregate across millions of ASBA applications in a large IPO.
• An unsuccessful applicant under ASBA has the full ₹14,700 available immediately on T+2 without waiting for a refund.

The interest-continuity benefit is more significant for high-value NII applications. An NII applying for ₹1,00,00,000 in an oversubscribed issue under the old regime would have had ₹1 crore out of their account for three weeks; under ASBA, the ₹1 crore stays in the account earning interest throughout.

References

1. SEBI Circular SEBI/CFD/DIL/DIP/31/2008/30/7 dated 30 July 2008, Application Supported by Blocked Amount (ASBA): Introduction.
2. SEBI Circular CIR/CFD/POLICYCELL/11/2015 dated 10 November 2015, ASBA made mandatory for retail in book-built issues.
3. SEBI Circular SEBI/HO/CFD/DIL2/CIR/P/2018/138 dated 1 November 2018, UPI as payment mechanism in ASBA.
4. SEBI list of authorised SCSBs, available at sebi.gov.in/intermediaries/scsb.
5. NPCI Circular dated 8 September 2025, UPI per-transaction limit for capital markets.

See also

• UPI ASBA , the UPI-based ASBA implementation for retail investors
• Bank ASBA NetBanking , the SCSB NetBanking implementation
• Initial Public Offering , the broader IPO process
• UPI mandate , the underlying NPCI construct used in UPI ASBA
• SEBI (ICDR) Regulations, 2018 , the regulatory framework
• Basis of allotment , the allotment process that triggers ASBA debit or release
• IPO listing day , the day by which all ASBA blocks are resolved
• Book running lead manager , the intermediary who specifies the sponsor bank in the RHP