An investor refreshes the broker app after a heavily oversubscribed IPO closes and finds "mandate not approved." The bid never reached the registrar, and the allotment door has shut. Most rejected IPO applications in 2026 fail for reasons that can be fixed before the next order, but only if you understand which payment route you were on, what its limits are, and where the chain of approvals can break. Both ASBA (Application Supported by Blocked Amount) and the UPI route rest on the same idea: your money stays blocked in the bank account until allotment, and only the allotted amount is debited.
In this blog, we'll look at how each route works, the ₹5 lakh limit, the nine common failure modes and their fixes, and which route fits which investor.
How ASBA and UPI Work: Same Foundation, Different Architecture
Bank ASBA is the older, structurally simpler route. You log into a Self-Certified Syndicate Bank's (SCSB) net-banking portal or visit a designated branch, enter the IPO bid, and the bank blocks the amount and uploads the bid to the exchange. There is no separate mandate to approve and no third app to keep open. SEBI's investor portal describes ASBA as the core mechanism on which every public and rights issue now runs.
The UPI route adds a payment-authorisation step to the ASBA framework. The bid goes through a broker or intermediary, and the sponsor bank for the issue sends a UPI mandate (a "collect request") to your UPI app. Approving it with your UPI PIN blocks the funds. In this process, UPI is the payment mechanism used to authorise the blocking of funds. The additional mandate step can create another point at which an IPO application may fail if the request is not received, approved or processed successfully.
Eligibility, Limits, and the ₹5 Lakh Ceiling
The key number to remember is ₹5,00,000. Individual investors can use UPI for IPO applications up to ₹ 5 lakh, while applications above ₹5 lakh require the ASBA route.
Two operational rules apply to both routes: only your own UPI ID and bank account are valid (third-party mandates are ineligible for allotment), and only one application per PAN per issue is accepted in a given category.
How Each Route Works Step by Step
#Bank ASBA via SCSB: Confirm the bank is on SEBI's SCSB list; not every commercial bank is one. Log in to net banking, find the ASBA or IPO menu, and enter the issue, category, PAN, demat details, bids, and total amount. The bank blocks the amount and uploads the bid. After allotment, it debits only the allotted amount and unblocks the rest. There is no refund cycle in ASBA; money that was never debited never left your account.
#UPI route via a broker: Three prerequisites must be in place: a demat and trading account with a broker that supports UPI IPO bidding, a bank account with an issuer bank that is live for IPO mandates, and a UPI handle notified by SEBI and NPCI for public issues.
Your PAN, demat name, and UPI-linked account name must all match. In the broker's IPO section, choose the issue, select the correct category, enter the lot size and price, and provide the UPI ID. The sponsor bank sends a mandate request to your UPI app. Open Pending Mandates, verify the details, and approve it with your UPI PIN.
Block requests not approved by 12:00 p.m. on T+1 after the issue closure lapse automatically. Treat the mandate notification like a time-sensitive OTP, because once the approval window closes, the IPO application becomes invalid.
Failure Modes and How to Fix Each
Most rejected UPI applications trace back to one of nine causes.
The single most common pattern is the mandate timeout: the bid went in, the mandate arrived, and the investor noticed only after the cut-off. The fix is procedural, not technical; treat the mandate notification like a time-sensitive OTP.
Which Route for Which Investor
Bank ASBA is structurally simpler because there is no separate mandate layer that can time out; the SCSB blocks funds and uploads the bid in one bank-side transaction. The constraint is that not every bank is an SCSB, and net-banking interfaces vary in usability. The UPI route is convenient when it works: everything happens in the broker and UPI apps without a bank login. But its multi-hop chain (broker, exchange, sponsor bank, issuer bank, UPI rails, registrar) creates more points of failure.
For individual investors applying up to ₹5 lakh, UPI offers a convenient way to authorise the blocking of funds through a broker or intermediary. The mandate must be approved within the prescribed time. For individual applications above ₹5 lakh and for non-individual applicants, the applicable ASBA route should be used.
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Conclusion
ASBA and UPI aren't really rivals; UPI is a payment layer on top of ASBA, but the route you pick decides how many things can go wrong before your bid reaches the registrar. Remember the ₹5 lakh line (above it, only bank ASBA), use only accounts in your own name, keep clear funds, and treat the UPI mandate like an OTP that expires.
A three-minute checklist before you bid: bank and UPI handle on SEBI's eligibility list, matching names across PAN, demat, bank, and UPI, and cleared funds prevent most failed applications. Open a free Demat account with SMC to apply for IPOs through ASBA or UPI.
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