What is ASBA in an IPO?

Every time you apply for an IPO in India today, one system is quietly working in the background to protect your money. It is called ASBA, Application Supported by Blocked Amount. Here is everything you need to know about how it works and why it matters.

Cast your mind back to the 1990s. Applying for an IPO in India meant issuing a cheque, handing it to a bank, and then waiting. And waiting. The company collected those cheques, pooled the money together, and took up to three months to finalise allotment. During those three months, it was your money earning interest for them.

When refunds finally came, they arrived as cheques by post. Many were lost. Many were delayed. It was a system built for the issuer, not the investor. ASBA changed all of that. Understanding how ASBA works is not just useful trivia. It is the foundation of everything that makes modern IPO investing in India fast, safe, and fair.

ASBA stands for Application Supported by Blocked Amount. Introduced by SEBI in 2008, it is the system through which every IPO application in India is processed today. The core idea is simple but powerful: when you apply for an IPO, your money is not transferred to anyone. It stays in your bank account. It is simply blocked, meaning the bank places a hold on that amount so it cannot be spent elsewhere.

The money only moves out of your account in one scenario: when shares are allotted to you. If you do not get allotment, the block is lifted automatically. No waiting for a refund cheque. No calling your bank. No paperwork. The money was never gone in the first place.

2008 Year SEBI introduced ASBA

53+ Self Certified Syndicate Banks as of 2024

100% Of all public issues now require ASBA

Since January 2016, SEBI has made ASBA mandatory for all categories of investors in all public issues. Whether you are a retail investor, an HNI, or a qualified institutional buyer, ASBA is the only valid payment method for IPOs and follow on public offerings in India today.

“Before ASBA, applying for an IPO meant your money left your account for months. Today, it never leaves at all until shares are yours.”

To appreciate ASBA properly, it helps to understand what came before it. In the 1990s and early 2000s, the IPO process worked like this:

• Investors issued cheques for the full application amount, which were immediately deposited by the company.

• The company sat on a massive pool of investor money for weeks or months while allotment was being finalised.

• This interim money earned interest for the issuer, not for the investor whose capital it was.

• In heavily oversubscribed IPOs, refund cheques were posted to millions of investors. A significant number never arrived or were delayed by weeks.

• The process of receiving physical share certificates took up to three months from the date of application.

A system called StockInvest was introduced in 1993 to address this, using a mechanism similar to what ASBA would eventually become. But fraudulent practices led the Reserve Bank of India to ban it in November 2003. SEBI spent the next few years building a cleaner, technology driven solution. The result was ASBA, which launched in 2008 and became mandatory across all investor categories by 2016.

Here is what actually happens behind the scenes from the moment you submit an application to the moment shares land in your demat account or your funds are freed.

1. You submit your IPO application.

Through your broker app (UPI method) or your bank’s net banking portal (ASBA net banking method), you enter your bid details: PAN, demat account information, number of lots, and price.

2.Your bank blocks the application amount.

The bank, acting as a Self Certified Syndicate Bank (SCSB), places a hold on the exact amount of your bid at the upper end of the price band. The money is not debited. It cannot be spent. But it continues to earn interest for you.

3.The bank uploads your bid to the exchange.

The SCSB electronically transmits your application details to the BSE or NSE bidding platform. This is fully digital and happens in real time.

4.The IPO closes and allotment is finalised.

After the subscription window closes, the registrar (such as Link Intime or KFintech) processes all bids, determines the basis of allotment, and runs the lottery for oversubscribed retail categories.

5.If allotted: only the exact amount is debited.

The registrar instructs the bank to debit only the amount proportionate to the shares allotted. If you applied for 10 lots but received 1 lot, only 1 lot’s worth is debited. The rest is unblocked immediately.

6.If not allotted: block is lifted automatically.

If no shares are allotted to you, the bank releases the hold on your funds without any action needed from you. There is no refund to wait for because the money was never taken.

A Self Certified Syndicate Bank (SCSB) is a bank that has been approved by SEBI to accept and process ASBA applications. As of 2024, 53 banks across India are registered as SCSBs. These include all major public and private sector banks such as SBI, HDFC Bank, ICICI Bank, Axis Bank, Kotak Mahindra Bank, Bank of Baroda, and Punjab National Bank.

SCSBs carry specific responsibilities in the ASBA process:

• Verifying the application for completeness and eligibility before processing.

• Blocking the funds in the investor’s account for the duration of the IPO subscription period.

• Uploading bid details electronically to the stock exchange bidding platform.

• Unblocking funds for unallotted applications once the basis of allotment is finalised.

• Transferring the allotted amount to the IPO escrow account on behalf of successful applicants.

Does Your Bank Need to Be an SCSB?

Yes. You can only apply through ASBA if your bank account is with a registered SCSB. The full list of SCSBs is available on the SEBI website. Most nationalised and large private banks qualify. If your bank is not an SCSB, you will need to apply through a broker using the UPI method, provided you are a retail investor applying up to ₹5 lakh.

Many investors think UPI and ASBA are two separate payment systems for IPOs. They are not. UPI is a method of implementing ASBA. Both systems ultimately block your funds rather than debiting them. The difference lies in where you apply and how the blocking instruction is communicated to your bank.

Aspect	ASBA via Net Banking	UPI Method (ASBA via UPI)
Where you apply	Bank’s net banking portal directly	Broker app, NSE or BSE website
Fund blocking	Bank blocks automatically on submission	You approve a UPI mandate to authorise the block
Mandate approval	Not required separately	Required within 30 minutes of applying
Application limit	No UPI ceiling. Ideal for larger amounts	Up to ₹5 lakh per application
Who uses it	All categories. Popular for HNI applications	Primarily retail investors
Offline option	Yes. Physical ASBA form at your bank branch	No offline option
Interest on funds	Earned by investor during blocked period	Earned by investor during blocked period

Since May 2022, SEBI has also banned third party applications. This means your UPI ID or bank account used for the IPO application must belong to the same PAN holder making the application. You cannot apply using a family member’s bank account, even with their consent.

ASBA was not just a technical upgrade. It fundamentally shifted power from the issuer back to the investor. Here is what changed:

Before ASBA Money debited upfront on application. Investor lost interest during allotment period. Refund cheques posted by mail. Took up to 3 months for refunds to arrive. Refunds sometimes lost or delayed in transit. No partial allotment mechanism.

After ASBA Money only blocked, never debited until allotment. Investor earns interest during the entire blocked period. Unblocked automatically if not allotted. Funds released within 1 working day of allotment. No physical movement of money or cheques. Only the allotted amount is debited on partial allotment.

The interest benefit is real and often underestimated. In a heavily oversubscribed IPO where your funds are blocked for 6 to 8 working days, you continue to earn interest on the full blocked amount at your savings account rate. Across multiple IPO applications in a year, this adds up to a meaningful sum that you would have completely forfeited under the old cheque based system.

Revising or Withdrawing Your Bid

One important feature of ASBA that many retail investors are unaware of: you can modify or withdraw your bid while the IPO is still open.

• Retail investors (RII): Can revise the bid quantity upward or downward, or withdraw the bid entirely before the IPO closes.

• Non institutional investors (HNI or NII): Can revise bids upward only. Cannot withdraw or reduce the bid size once placed.

• Qualified institutional buyers (QIB): Cannot withdraw bids once placed. Can only revise upward.

If you realise you entered the wrong lot quantity, want to reduce your exposure, or simply change your mind about the IPO, you have until the closing time on the last day to revise. To do this, contact your broker or log back in to your bank’s net banking portal and look for the bid modification option under your IPO application.

Common Misunderstandings About ASBA

Clearing Up the Confusion

"My money is gone when I apply." It is not. The funds are only blocked in your account and continue to earn interest. They are debited only if you receive allotment.

"ASBA improves my chances of getting allotment." It does not. ASBA is a payment mechanism, not an allotment advantage. Allotment is determined by SEBI rules and a computer drawn lottery.

"I need a demat account with my SCSB bank to use ASBA." You do not. Your demat account can be with any registered depository participant. The ASBA bank only handles the fund blocking.

"I can apply from any bank account using ASBA." Only bank accounts held with registered SCSBs qualify. Third party accounts are not permitted since May 2022.

"My blocked amount earns no interest." Incorrect. The funds remain in your savings or current account and earn the applicable rate throughout the blocked period.

ASBA is one of the most investor friendly reforms in the history of Indian capital markets. It put an end to months of money being tied up with issuers, eliminated the chaos of postal refunds, and ensured that every rupee of your IPO application continues to work for you until the moment shares are actually yours.