Why IPO and G-sec orders can be blocked or unavailable on Kite

IPO and government-securities orders on Kite route through fixed bidding windows set by the issuer, the exchange and the Reserve Bank of India, not through the continuous order book that handles ordinary equity trades, so the order option is available only while a window is open and is closed by design at every other time. A blocked or missing “Apply” button for an IPO, or a greyed-out bid screen for a G-sec, T-bill, State Development Loan or Sovereign Gold Bond, almost always means the relevant window has not opened yet or has already shut, not that the platform is broken.

This is the single most common reason a Zerodha client cannot place one of these orders when they expect to. An equity order rests in a live, continuous market from 9:15 AM to 3:30 PM. A primary-issuance order does not. It is collected during a defined subscription or auction window, forwarded in a batch, and either allotted or rejected after the issuer or the RBI runs the allotment. Miss the window and there is nothing to place the order into until the next cycle.

Conflict-of-interest disclosure. This guide is published by the WebNotes Editorial Team for informational purposes and is written independently. WebNotes operates a Zerodha account-opening referral programme, disclosed on the pages that carry the referral link; this guide does not carry it and earns no referral commission from the procedure described here.

This article sets out the four distinct windows, the exact cut-off times Zerodha publishes for each, the segment-activation and account-eligibility checks that close the path for some clients, and how to tell a window-driven block apart from a genuine rejection. For the step-by-step IPO flow itself, see how to apply for an IPO on Kite web and how to apply for an IPO on the Kite app .

The IPO bidding window

An IPO is not a market order. The book-building bids are collected by the exchange across the three or more days the issue stays open, then handed to the registrar for allotment. The “Apply” option on Kite is live only inside that collection window.

For retail applications, Zerodha’s support desk states the order window runs from about 10:00 AM on the open day to about 4:45 PM on the close day, with a pre-apply slot the day before the issue opens. The UPI mandate, the approval request that blocks your funds, is accepted until about 5:00 PM on the closing day. Submit your bid before roughly 3:00 PM on the last day so the mandate request reaches your UPI app and you can approve it before the 5:00 PM acceptance cut-off. A bid submitted late, or a mandate approved after the cut-off, fails even though the application screen accepted it.

The High Net Worth Individual window is tighter. It closes at 4:00 PM on the last bidding day, and bids placed after 3:00 PM are collected and forwarded to the exchange on a best-effort basis. Zerodha categorises the application automatically: an application of Rs 2 lakh or more is treated as HNI without any separate option, which also means the 4:00 PM cut-off applies to it rather than the 4:45 PM retail cut-off. A bid for Rs 2 lakh or more attempted between 4:00 PM and 4:45 PM on the close day can therefore be blocked even though a smaller retail bid would still go through. See IPO investor categories: retail, HNI and QIB and IPO order timings on Kite for the category split.

Two more conditions close the IPO path regardless of timing. Cut-off-price bidding is available only up to Rs 2 lakh; above that you must enter a bid price manually, so the simplified “apply at cut-off” route is unavailable for large bids. And applications above Rs 5 lakh cannot use UPI at all under SEBI rules; they must apply through the ASBA net-banking route at the bank, so the UPI flow on Kite is closed to them by value, not by time.

These times can shift slightly by issue, so the live window shown on the Kite IPO screen for the specific issue is the authoritative one.

The government-securities non-competitive bidding windows

Government securities reach a retail buyer through the non-competitive segment of an RBI auction, routed to the exchange and on to Zerodha. Each instrument class has its own weekly window because each maps to a different RBI auction day. The block you see outside these hours is the window being shut, not an order failure.

Zerodha publishes the following windows, which the support desk notes may change with exchange timings and trading holidays:

A holiday changes the cut-off. If the auction settlement day falls on a holiday, Zerodha moves the cut-off to the previous trading day, so a holiday-shortened week closes the window earlier than the usual weekday time. A trader who waits until the normal Thursday 8:00 PM bond cut-off in a week with a Thursday holiday can find the window already shut on Wednesday.

For the precise, current per-instrument cut-offs, see G-sec bid cut-off times , and for the mechanics of each instrument, how to buy a G-sec on Zerodha Kite , how to buy a T-bill on Zerodha and the Zerodha T-bills overview.

Why the money is blocked, not debited

When you place a G-sec or T-bill bid, the funds are blocked, not debited, until allotment, mirroring the ASBA logic of an IPO. Allotment runs within about T+2 days of the auction day, excluding holidays, and the securities are issued in limited amounts, so allotment is not guaranteed if total bids exceed the issue size. If you are not allotted, the blocked amount is released and you bid again at the next auction. A common confusion, a block that looks like a stuck order, is simply the auction holding your funds against a pending allotment inside the window’s settlement cycle.

Why fresh SGB buying is unavailable between tranches

A Sovereign Gold Bond has no continuous primary window at all. The primary subscription opens only while the RBI runs a specific tranche, which lasts a few days, with Zerodha’s window opening by 6:00 AM Monday and closing by 3:30 PM Friday of that subscription week. Between tranches there is no primary issue to bid into, so the fresh-buy option is unavailable on Kite. The only route to fresh SGB exposure then is the secondary market, where existing bonds trade on the exchange. See Sovereign Gold Bond and how to bid for an SGB in the primary issuance for the distinction between the primary tranche and secondary-market buying.

Account eligibility and segment activation

A window can be open and the order still blocked because of who holds the account.

NRIs cannot participate in non-competitive bidding for G-secs, T-bills and SDLs through the exchange platform Zerodha uses; the segment is closed to them, so the bid option stays greyed out for an NRI account regardless of timing. An NRI seeking G-secs must approach a bank or an RBI-registered primary dealer for competitive bidding instead. See NRI G-sec investment on Zerodha and RBI Retail Direct versus Zerodha bonds for the alternatives.

For IPOs, the UPI ID used must map to a bank account belonging to the applicant; an application made with someone else’s UPI ID is rejected. A dormant account can still apply for an IPO, but the allotted shares cannot be sold until the account is reactivated. HUFs may apply through UPI ASBA using the HUF bank account’s UPI ID, while company, partnership, LLP, AOP, trust and society accounts can apply only through ASBA, so the UPI path on Kite is closed to those entity types. And applying for the same IPO more than once across different demat accounts on the same PAN gets every such application rejected.

Trading-account funds cannot be used for an IPO at all. Under SEBI’s framework the application is funded only by ASBA through net banking or UPI, with the money blocked in your own bank account; money sitting in the Zerodha trading account is not eligible, so an applicant with a funded trading account but no UPI mandate still cannot place the bid. See how funds are debited for SGB orders for the parallel blocking mechanism on the debt side.

Telling a window block apart from a genuine rejection

A window-driven block and a true order rejection look different on Kite and need different responses.

A window block presents as a missing or greyed-out option: no “Apply” button for an IPO that has not opened, or a disabled bid screen for a G-sec outside its auction hours. There is no rejection message because no order was ever submitted to an exchange. The fix is to wait for the next window, nothing more.

A genuine rejection presents as a placed order that the exchange or Zerodha’s risk system bounced back with a reason: insufficient funds, a UPI mandate not approved in time, a duplicate PAN application, or an eligibility failure. That message names the cause and needs a corrective action, not a wait. For the broader rejection-handling pathway on equity orders, see how to fix an RMS rejection on Zerodha . The distinction matters because waiting will never clear a true rejection, and resubmitting will never beat a closed window.

See also

• How to apply for an IPO on Kite web
• How to apply for an IPO on the Kite app
• IPO order timings on Kite
• IPO investor categories: retail, HNI and QIB
• IPO price band
• The IPO process in India
• ASBA
• UPI mandate
• G-sec bid cut-off times
• How to buy a G-sec on Zerodha Kite
• How to buy a T-bill on Zerodha
• Zerodha T-bills
• Sovereign Gold Bond
• How to bid for an SGB in the primary issuance
• How funds are debited for SGB orders
• NRI G-sec investment on Zerodha
• RBI Retail Direct versus Zerodha bonds
• How to fix an RMS rejection on Zerodha
• Sovereign gold bonds
• Kite by Zerodha
• Zerodha
• Kite web
• Kite mobile app
• National Stock Exchange
• Bombay Stock Exchange
• SEBI

External references

• Zerodha support: When can bids be placed for SDLs, T-bills, government bonds and SGBs?
• Zerodha support: When can you place IPO orders on Zerodha?
• Zerodha support: How to apply for an IPO
• RBI: Scheme for Non-competitive Bidding Facility in the Auction of Government Securities
• SEBI: UPI as a payment mechanism in public issues
• NSE India: Government securities and IPO bidding

References

1. Zerodha support, When can bids be placed for SDLs, T-bills, government bonds and SGBs? (windows as of June 2026).
2. Zerodha support, When can you place IPO orders on Zerodha? (retail and HNI windows, UPI mandate cut-off, as of June 2026).
3. Zerodha support, How to apply for an IPO, and eligibility for UPI ASBA versus ASBA (as of June 2026).
4. RBI, Scheme for Non-competitive Bidding Facility in the Auction of Government of India dated securities and Treasury Bills.
5. SEBI circular on UPI as a payment mechanism for ASBA in public issues, and the Rs 5 lakh UPI ceiling.