Why market orders are blocked on T2T and debt instruments on Kite

Market orders are blocked on trade-to-trade (T2T) stocks and on debt-category instruments, including Sovereign Gold Bonds , on Kite ; only limit orders are accepted. The reason is liquidity. These instruments trade in low volume, so a market order , which fills at the best available price regardless of level, can execute far from the last traded price. On a thin order book a market order can fill a small quantity at a sensible price and the rest at a punishing one, committing a trader to a far larger or smaller cash amount than intended with no chance to react. Requiring a limit order forces the trader to set a price ceiling or floor, which is the protection these instruments need.

The block reflects both Zerodha’s own risk policy and exchange rules. NSE restricts market orders in instruments that have no trades during the day, since execution could occur at a random price or the order could rest open for want of volume. This article explains the slippage mechanism, why T2T and debt instruments are singled out, and how to get a near-instant fill safely with a limit order.

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 pages that carry a referral link; this guide does not carry it and earns no referral commission on the exchange rule described here.

What a market order does on a thin book

A market order buys or sells at the best available price, sweeping the order book until the full quantity is filled. On a deep, liquid scrip the book has size at every tick near the last price, so a market order fills within a tick or two of where it stood. On a thin instrument the book is sparse: a few quotes near the last price, then a gap, then quotes far away.

Take the illiquid case Zerodha uses to explain the block. Suppose only one lot is offered at the expected price and the rest of the book sits much higher. A market buy lifts the cheap lot, then keeps filling against the next available quotes, paying the much higher price for the balance. The trader expected to spend near the last price and instead has a much larger amount blocked in the trade than anticipated, all in a fraction of a second. The same slippage works in reverse for a market sell into a thin bid stack, dumping the quantity at progressively lower prices. With no opportunity to cancel mid-sweep, the loss is locked in.

A limit order removes this exposure. By naming the worst acceptable price, the trader fills only up to that level; any quantity that would require a worse price simply rests unfilled rather than executing at a punishing price.

Why trade-to-trade stocks are covered

A trade-to-trade stock settles by compulsory delivery on a gross basis, with no intraday netting. Stocks land in the T2T segment through the surveillance frameworks, often via higher stages of the Additional Surveillance Measure (ASM) or Graded Surveillance Measure (GSM) , or because of weak fundamentals and stretched valuations. The same factors that put a scrip into T2T, thin trading and abnormal price action, are exactly the conditions in which a market order is unsafe. A delivery-only scrip with a few thousand shares of daily volume offers no depth to absorb a market order at a fair price. Blocking market orders on the whole T2T segment is therefore a clean rule: the segment is defined by the conditions that make market orders dangerous.

The market-order block sits alongside the other restrictions on T2T scrips, no MIS intraday leverage, no BTST, and delivery-only settlement, all of which trace to the same surveillance and liquidity concern.

Why debt instruments and SGBs are covered

Debt-category instruments on the equity exchange, such as listed bonds, debentures, and Sovereign Gold Bonds , trade in low secondary-market volume. Most holders of an SGB buy at issue and hold to the gold-linked redemption, so the exchange order book for a given SGB tranche is often thin and patchy. A market order in such a tranche can sweep the few available quotes and fill at a price disconnected from the bond’s fair value, which moves with the gold price rather than with order-book noise. The exchange and Zerodha block market orders on these instruments for the same reason as T2T scrips: thin volume means a market order risks a wildly unfavourable fill. Only limit orders are accepted, so the trader sets the price.

How to trade these instruments safely

Use a limit order, and place it to behave like a market order without the slippage. To buy, set the limit at or just above the best offer; to sell, set it at or just below the best bid. An order priced at or just beyond the best opposing quote is marketable: it executes against the resting quotes immediately, giving near-instant execution, while the limit caps how far the fill can run. This is the recommended approach for a fast fill on a thin instrument: you get the speed of a market order with a hard price boundary.

Set the limit deliberately on a thin book. A limit placed exactly at the last traded price may not fill if the best offer has moved up; a limit a few ticks beyond the best opposing quote fills the available size and rests for the remainder rather than chasing the book. For an SGB or a bond, check the displayed best bid and offer before pricing, since the spread can be wide and a careless limit can either miss entirely or pay the full spread.

For traders who specifically want price protection on an otherwise market-style order in liquid instruments, the related market price protection parameter caps how far a market order can slip; on T2T and debt instruments, however, the market order itself is unavailable, so the limit order is the only route.

See also

• Zerodha
• Kite (Zerodha)
• Trade-to-trade (T2T) stocks on Zerodha
• Market order on Kite
• Limit order on Kite
• Sovereign Gold Bonds
• ASM (Additional Surveillance Measure) on Zerodha
• GSM (Graded Surveillance Measure) on Zerodha
• MIS product code
• CNC product code
• NRML product code
• Cover order (CO) on Zerodha
• SL-M order on Kite
• Trigger vs limit price
• Disclosed quantity orders
• Iceberg order on Kite
• Order validity types
• Circuit limits and price bands
• Why iceberg and MIS orders are not allowed for some stocks
• Intraday auto-square-off timings (MIS)
• National Stock Exchange
• Bombay Stock Exchange
• SEBI
• How to fix RMS rejection on Zerodha
• How to fix circuit-limit rejection on Zerodha
• GTT order on Zerodha

External references

• Zerodha support: Why are market orders blocked for trade-to-trade and debt category instruments?
• Zerodha support: What are Trade-to-Trade (T2T) stocks?
• NSE: circulars archive (market order restrictions)
• RBI: Sovereign Gold Bond Scheme
• SEBI: official site

References

1. Zerodha support, Why are market orders blocked for trade-to-trade and debt category instruments? (as on 21 June 2026).
2. Zerodha support, What are Trade-to-Trade (T2T) stocks? (as on 21 June 2026).
3. NSE circulars restricting market orders in instruments with no trades during the day (equity and F&O).
4. RBI, Sovereign Gold Bond Scheme operational guidelines (secondary-market trading).
5. NSE and BSE surveillance frameworks, trade-to-trade segment settlement rules.