Guide · Market structure · Updated 2026-09-23

Under T+1 your money is due in the morning and your shares arrive in the afternoon, and every failure lives in that gap

Most explanations of T+1 list what it gives: shares a day sooner, cash a day sooner. From the operational side it reads the other way round. Compressing the cycle moved the moment your money must exist to the morning after you trade, while the shares you bought still arrive in the afternoon, at the end of that same settlement day. What goes wrong for a retail trader goes wrong inside that asymmetry: money that is late, a sale of shares still in transit, and a holiday that moves both deadlines without moving the habit.

This page works through the clock from SEBI’s and NSE Clearing’s own schedules, computes it for a trader who buys one day and sells the next, and measures from the clearing corporation’s files how the machinery ran in 2026. The headline history is in the guide to T+1 and the case for same-day settlement in the T+0 guide.

Two obligations, and a deadline that falls before the shares arrive

A trade on an Indian exchange creates two obligations, and neither is owed to the person on the other side. NSE Clearing becomes buyer to every seller and seller to every buyer, nets each broker’s trades in each security across the day, and turns the result into a pay-in, what the broker owes it in money or shares, and a pay-out, what the broker is owed. The pay-in comes first because it funds the pay-out, which is why a shorter cycle is felt first as an earlier deadline rather than as faster money.

Two of those times deserve a second look. SEBI’s activity schedule, in its Master Circular for Depositories of 3 December 2024 (para 4.83.1), puts the pay-in at 11:00; NSE Clearing’s funds and securities settlement pages ask its members for clear funds and shares by 10:30. Your broker’s cut-off sits earlier again, because it has to collect, reconcile and pass the money on before then. And the securities pay-out is 3:30 pm, not 1:30 pm. SEBI moved it by circular of 10 October 2024 to make room for crediting shares straight into each client’s demat account rather than the broker’s pool. That direct pay-out was set for 14 October 2024, extended to 11 November 2024, and implemented by the exchanges, clearing corporations and depositories on 25 February 2025, as their joint press release of 2 March 2025 records. A page that says your shares arrive at 1:30 pm, or that direct pay-out began in October 2024, describes a timetable that never ran in that form.

Netting is what makes a next-morning deadline workable at all. On the median settlement day of 2026, NSE Clearing’s Daily Settlement Statistics show funds equal to 6.5 per cent of the value traded moving at settlement, and securities worth 29.8 per cent of it changing hands; the rest cancelled inside the net. That netting belongs to the clearing corporation and your broker. Your own obligation on a delivery purchase is the full price plus charges, due before the pay-in.

How the cycle got here, and the dates most pages get wrong

India did not switch to T+1 by decree. SEBI’s circular of 7 September 2021 allowed exchanges to offer T+1 on any security from 1 January 2022, and the exchanges, clearing corporations and depositories chose a phased road: the bottom 100 companies by market capitalisation from trade date 25 February 2022, the next 500 on the last Friday of each month after that (NSE/CMTR/51414), and every remaining security, including every stock with derivatives, from 27 January 2023 (NSE/CMTR/54992). That put India on a one-day cycle sixteen months before the United States, which moved on 28 May 2024, and years ahead of the European Union and the United Kingdom, which have fixed 11 October 2027.

An explanation written before 2025 predates the last six rows, and so describes a settlement day that no longer runs.

Where the money has to be, and when

The rules count backwards from the clearing corporation. A broker must collect VaR and extreme loss margin from the client before a cash-market order, or a flat 20 per cent in their place (SEBI circular of 19 November 2019), and SEBI’s own illustration of the process, in Annexure 28 of the depositories master circular, has the client posting that 20 per cent on the trade date and the remaining 80 per cent by the settlement deadline. That deadline is the broker’s, and it falls before 10:30, because NSE Clearing charges a member short of funds 0.07 per cent a day and, at a shortfall of ₹5 lakh, withdraws its trading facility and withholds its securities pay-out (NSE Clearing, funds settlement). Faced with that, many Indian brokers ask for the full value before they place a delivery order.

Money left with a broker does not stay there either. Since 1 July 2023 brokers may not keep clients’ funds overnight; they are upstreamed to the clearing corporation as cash, a lien on a fixed deposit or a pledge of overnight fund units (SEBI circular of 8 June 2023). What is not used goes back to your bank on the running-account settlement date, the first Friday of the quarter, or of the month for clients who choose monthly settlement (SEBI circular of 27 July 2022). On a sale the money runs the other way, and later: NSE Clearing pays the broker on or after 1:30 pm on the settlement day, so a Friday sale pays out on Monday afternoon. Selling on Monday to fund something on Tuesday means counting settlement days, not calendar days.

Buy today, sell tomorrow: a sale of shares that are still in transit

Many Indian brokers let a client sell shares bought the previous day before they arrive. The name hides what it is: a delivery obligation for Wednesday backed by a delivery due to you on Tuesday afternoon, from someone else. Take an illustrative trader who buys 200 shares at ₹480 on Monday and sells them at ₹492 on Tuesday morning, in a week with no holiday.

On the normal path it works because of the order of events. The 200 shares land at 3:30 pm on Tuesday, the sale’s obligation is fixed that evening, and the shares leave your demat at Wednesday’s pay-in, blocked as an early pay-in that night or moved under the authorisation you have given your broker. The ₹98,400 reaches your broker from 1:30 pm on Wednesday.

If Monday’s seller does not deliver, NSE Clearing sees the shortfall at Tuesday’s pay-in, auctions it between 2:00 and 2:30 pm, and settles the auction on Wednesday, with its pay-out at 10:00 in the schedules it published through 2026. That leaves thirty minutes before your own sale’s 10:30 pay-in. If the auction found no seller there are no shares at all: your purchase is settled in cash at the close-out price, and your sale is now a shortfall of its own. The clearing corporation takes a valuation debit from your broker at once, auctions your shortfall on Wednesday afternoon, and settles that auction on Thursday or, if it too fails, closes it out.

The close-out price is set by rule: the higher of the highest price recorded from the trade date to the auction day and 20 per cent above the latest closing price on the auction day, in the words of SEBI’s master circular for stock exchanges and clearing corporations of 30 December 2024 as NSE Clearing quotes it (NCL/CMPT/71441). It is paid to a member that did not receive shares and charged to one that did not deliver them. When both legs close out, you are paid one close-out price and charged another, each set on a different day.

The gap between the two prices is not a rounding error. Applying the rule to real prices, for every equity-series stock across the 1,164 distinct sessions in the security bhavcopy from 3 January 2022 to 18 September 2026, gives 2,293,069 pairs of back-to-back close-outs. The difference between the close-out paid on the purchase and the one charged on the sale had a median of 0.07 per cent of the position, but the middle 90 per cent ran from minus 5.6 to plus 4.6 per cent, and in 10.2 per cent of cases it exceeded 5 per cent either way. Because both prices sit about a fifth above a close, the gap is roughly one day’s move scaled up by a fifth, in a direction the trader does not choose. The auction itself, and why the close-out carries a premium, are in the guide to short delivery and the auction.

How often delivery fails, and the rule that put every shortfall into the auction

Failure is small as a share of each settlement and routine as a count. NSE Clearing’s Daily Settlement Statistics report shortages of 0.04 per cent for the median ordinary settlement of 2026 and 0.08 per cent at the upper quartile, with a high of 1.93 per cent on 3 June 2026. Yet its list of securities for auction named a median of 200 securities a day, and never fewer than 124, across the 172 lists from 2 January 2026 to 22 September 2026. Most lines are small: across all 40,798 of them the median shortfall was 50 shares, 34 per cent were for ten shares or fewer, and 14 per cent were for a single share.

Part of that count is new. Before 2025 a shortfall between two clients of the same broker could be settled inside the broker’s own books, at a rate its own policy set. SEBI’s circular of 5 June 2024 on direct pay-out required such internal shortages to go through the clearing corporation’s auction, and from 7 March 2025 NSE Clearing identifies them itself, by comparing each member’s gross sell obligations with what it paid in, collects a valuation of the settlement price plus 20 per cent by noon, and runs the auction (NCL/CMPT/66688). Where the auction is not held or fails, the broker must pass the auction rate or the close-out rate through to the clients concerned. A seller who fails inside a large broker now meets the same auction as one who fails across brokers.

A holiday in the cycle stretches the clock, and can stack two settlements into one evening

T+1 counts settlement days, not calendar days. NSE Clearing excludes every intervening bank holiday, exchange holiday, Saturday and Sunday when it fixes a settlement date, and publishes the result a month ahead. Read across its calendars for January to October 2026, the 205 trade dates settle like this.

Four weekdays in that calendar traded but settled nothing: 19 February, 19 March, 1 April and 26 August, each a bank holiday on which the exchanges stayed open. The longest wait was four calendar days, six times, and the oddest was the purchase made on Monday 30 March, which settled on Thursday 2 April because 31 March was a full holiday and 1 April, the annual closing of bank accounts, traded without settling.

The day after such a holiday is less known. SEBI requires settlements that pile up behind a closure to run in sequence, the pay-out of the first available for the pay-in of the next (depositories master circular, para 4.4), and NSE Clearing’s 2026 schedules show how: the auction held before the holiday settles between 08:00 and 10:00, the trades of the day before the holiday pay in at 10:30 and pay out at 3:30 pm, and the holiday’s own trades pay in at 4:30 pm and pay out at 9 pm (NCL/CMPT/72843, 73460 and 75670). A seller on the holiday is paid that night rather than that afternoon, and the evening settlement’s shortfalls wait for the next day’s auction.

The evening settlement is also where more deliveries failed. On four of the five multiple-settlement days of 2026 the second settlement reported the higher shortage rate, against a median of 0.04 per cent on ordinary days. Five days are too few to call it a rule. One reading, which these files cannot confirm, is that sales made on the holiday rested on shares that arrived only in that day’s first pay-out.

Holidays also move at short notice. On 9 January 2026 NSE Clearing declared 15 January a settlement holiday for municipal elections in Maharashtra, and three days later it became a full trading and settlement holiday (NCL/CMPT/72224 and 72278). The Sunday Budget session of 1 February 2026 settled on Monday 2 February at the evening times (NCL/CMPT/72384). What a settlement holiday does to a record date, and so to a dividend, is in the guide to record dates under T+1.

Same-day settlement is live, optional and almost unused

T+0 has run beside T+1 since 28 March 2024, first for 25 scrips and, from 31 January 2025, for the top 500 companies by market capitalisation as at 31 December 2024, added a hundred a month (SEBI circulars of 21 March and 10 December 2024). It trades from 9:15 am to 1:30 pm in a separate book priced within 100 basis points of the T+1 market, and its obligations are never netted with T+1 obligations, nor with physical settlement of derivatives (NSE Clearing’s T+0 FAQ, NCL/CMPT/66248).

The operational terms are stricter than the headline. A T+0 sale can be paid in only as an early pay-in, the shares blocked in your demat by 1:45 pm. Early pay-in of funds and the creation of a UPI block also close at 1:45 pm, and the member’s own funds pay-in at 3:30 pm. There is no auction: a T+0 shortage is closed out at 10 per cent above the day’s highest price across exchanges, and no T+0 trading happens at all on a settlement or bank holiday. The requirement that the largest brokers, the qualified stock brokers, build systems for it was due on 1 May 2025, moved to 1 November 2025, and was then deferred without a new date by SEBI’s circular of 30 October 2025.

Use has followed. NSE’s weekly list of trading members that participated in T+0 shows 66 in the launch week and 23 the week after; in each of the 36 weeks it covers in 2026 it shows between one and seven, and in the week to 18 September 2026, one. For a retail trader the lane exists on paper and rarely at the point of access.

The block instead of the transfer: where your money sits

The larger change to where a trader’s money sits is not T+0 but the UPI block. Under SEBI’s framework of 23 June 2023, live at NSE Clearing under its circular of 28 December 2023, a client can trade against money blocked in their own bank account in favour of the clearing corporation instead of transferring it to the broker. The block counts as collateral, can be debited several times until it is used, released or expires, and is debited by the clearing corporation alone, to the extent of that client’s own obligation (depositories master circular, para 4.63).

Three things change. The money earns what the bank account earns until the debit. The obligation settles on its own, in a first pay-in round with no netting across clients and with securities transaction tax and stamp duty included, so the block must cover the whole of it. And the pay-out goes straight to the client’s bank on the settlement day, with no running account at the broker. The framework set a single block at ₹5 lakh, the UPI limit then applying to securities transactions, with several blocks allowed. Since 1 February 2025 every qualified stock broker must offer either this or a 3-in-1 account linking bank, trading and demat accounts (SEBI circular of 11 November 2024); for the client it remains a choice. NSE Clearing’s list of banks whose customers can create such blocks grew from four in October 2025 to seven by March 2026.

Late money: the shares still arrive, pledged, and the rule tightens on 31 October

A purchase you have not paid for in full is not cancelled. Under direct pay-out the clearing corporation still credits the shares to your demat, pledged to your broker’s Client Unpaid Securities Pledgee Account when the broker reports you unpaid (NSE Clearing, securities settlement). For a client on the UPI block the rule is written out: the shares are paid out and pledged, the shortfall is taken from any later block, and the broker may sell the pledged shares if it is not.

From 31 October 2026 the mechanism gets hard edges, under SEBI’s circular of 3 July 2026 and NSE’s operational guidelines of 31 July 2026 (NSE/INSP/75508). Unpaid status is judged on the end-of-day clear ledger balance, and the broker must tell you what it pledged before the next day’s trading. Its written policy sets how long you have to pay, at most five trading days from the pay-out, the window in which a pledge can already be invoked; after reasonable notice it may sell the shares under your own client code. It may give you no trading exposure against them, and a pledge neither invoked nor released within five trading days is released by the depository at the end of the sixth.

What a trader actually does differently

None of this asks for a new strategy. It asks for habits the one-day cycle made compulsory, each tied to a failure the system handles without asking you.

The clock is public, and so are the calendars, the auction lists and the settlement statistics; almost none of it is visible from an order screen. Reading them before the order rather than after the debit is a matter of method, which is why the curriculum treats the plumbing under an order as part of the trade rather than as back-office detail.