SEBI T+1 vs T+0 Settlement Cycle: How Faster Settlement Affects Margin and Liquidity

Indian equity markets sit on the global frontier of settlement reform. Since January 2023, the entire NSE and BSE cash segment has cleared on a T+1 basis, and on 28 March 2024 the Securities and Exchange Board of India (SEBI) launched an optional T+0 cycle for 25 listed stocks - a beta phase that has since been expanded as part of a phased rollout. For pre-open desks watching margin trees, arbitrage spreads and intraday liquidity, this shift is no longer theoretical. It changes how money moves, when it moves, and how much capital must be locked behind every trade.

This briefing maps the architecture of T+1 versus T+0, the funding and arbitrage consequences for active traders, and the variables to watch through today's session.

Market Snapshot

India is now the only major market operating a default T+1 settlement cycle alongside an optional same-day (T+0) window. T+1 means cash and stock change hands one business day after the trade; T+0 settles by 4:30 PM on the same trading day. Both cycles run in parallel for eligible scrips, and SEBI's phased rollout signals further expansion.

Source: SEBI circulars on settlement cycle reform.

The economic stakes are concrete. A shorter cycle means margin and pay-in obligations clear faster, freeing capital that earlier sat blocked at the clearing corporation. It also compresses the window during which counterparty risk accumulates between trade and settlement. For brokers running tight working capital, this is straightforwardly bullish; for arbitrageurs running cash-futures pairs, the change scrambles cost-of-carry maths that depended on a 2-day funding window before 2023.

What Moved Yesterday

The settlement cycle is structural plumbing, not a daily ticker - but each leg of the rollout has moved volume, spreads and broker behaviour in measurable ways since the 28 March 2024 launch of T+0. India transitioned from T+3 to T+2 in 2003, then to T+1 in three phases between February 2022 and January 2023. Each compression reduced the average margin float in the system.

Yesterday's action across the secondary market continued to reflect three behavioural patterns that began with T+1 in January 2023:

• Higher delivery turnover share for liquid scrips, because rolling intraday positions to the next day no longer offers settlement-funding arbitrage on a 1-day cycle.
• Compressed cash-futures basis in single-stock derivatives, since the cost-of-carry funding window is now one day instead of two.
• Earlier broker pay-in cut-offs, with most retail brokers asking for funds by 4 PM on T-day to avoid interest charges on T+1 settlement.

For a long-only investor running a systematic plan through a SIP calculator, settlement mechanics are largely invisible - but the broker's funding policy on the last day of the month can still tip a market order into next-day pricing if cleared funds arrive late on T-day.

What to Watch Today

The single most important watch-item for the rest of 2026 is SEBI's expansion calendar for T+0, which began with 25 stocks on 28 March 2024. The Board has signalled a phased extension contingent on operational readiness across exchanges, clearing corporations, depositories and qualified stock brokers. Each extension reshapes liquidity in two ways: it pulls intraday flows that previously preferred the T+1 default, and it forces arbitrage desks to recalibrate their cost-of-funding models.

Today's pre-open watch-list for desks tracking the settlement story:

The other macro lens is the relationship between settlement reform and passive flows. As covered in our note on the MSCI India quarterly rebalance, index inclusion events generate concentrated buying windows; a faster settlement cycle reduces the slippage that passive trackers absorb between trade and pay-in. Similarly, regulatory deadlines such as those flagged in our MCA ROC annual filing schedule shape corporate calendar risk that, in turn, drives trading volume.

For retail capital allocators running a step-up SIP or lumpsum allocation, the shift since January 2023 is mostly a tailwind: fewer days of unsettled exposure means lower implicit funding costs are absorbed across the chain.

Margin maths under T+0

A worked example clarifies the funding impact. Under T+1, a buyer of Rs 10 lakh of equity must arrange clear funds by the broker's pay-in cut-off on T+1 morning. Under T+0, the same buyer must arrange clear funds by the same-day cycle's pay-in window, with final settlement by 4:30 PM IST per SEBI's 28 March 2024 launch framework. The broker's risk margin (VAR + ELM + ad-hoc) does not vanish - but the funding tail shrinks from one business day to a few hours.

For derivatives desks, the bigger consequence is in the implied financing rate of the cash-futures basis. If single-stock futures continue to settle on a different cycle than the underlying cash leg, the implied carry rate on the spread narrows when the cash leg shortens. This is why arbitrage shops have re-priced single-stock basis trades since the 28 March 2024 T+0 launch.

Tax and reporting impact

The settlement cycle does not change the date of transfer for capital gains tax purposes - what matters is the contract note date, which is the trade date in both T+1 and T+0. So a sale executed today crystallises the gain or loss on today's date for the income tax computation, regardless of which settlement window clears the cash. Investors planning year-end harvesting alongside their advance tax instalments should continue to use the trade date, not the settlement date, for booking purposes.

FAQ

What does T+0 settlement mean for retail investors?

T+0 means the cash and stock leg of an equity trade settle on the same trading day - by 4:30 PM IST under SEBI's 28 March 2024 launch framework. For retail investors, this means proceeds from a sale are available the same evening for re-investment or withdrawal, and purchase pay-in must be funded earlier in the trading day than under T+1.

Is T+0 mandatory or optional?

T+0 is currently optional, running in parallel with the default T+1 cycle that has applied to all cash equities since January 2023. SEBI launched the T+0 beta phase on 28 March 2024 for 25 listed stocks and has been expanding coverage in a phased manner. The default cycle for all cash equities remains T+1 unless the investor and broker explicitly route the trade to the T+0 window.

How does T+0 affect margin requirements?

The risk margin charged by clearing corporations (VAR plus ELM plus any ad-hoc margin) does not disappear under T+0, but the funding tail shrinks. Under T+1 a buyer's funds must clear by the next business morning; under T+0 the funds must clear by the same-day pay-in window. This shortens the broker's working-capital cycle but tightens the cut-off for retail investors compared with the pre-2023 T+2 era.

What happens to the cash-futures arbitrage with T+0?

Single-stock futures and the cash leg historically settled on different cycles, generating an implied financing rate captured in the futures basis. As the cash leg compresses to T+0 from T+1 (a 1-day to same-day move), the carry trade has fewer days of funding to monetise, and arbitrage spreads have narrowed for stocks where T+0 turnover is meaningful since 28 March 2024.

Does T+0 apply to FPIs and mutual funds?

Custodian-routed flows, including most FPI and mutual fund trades, settle through a different operational chain. SEBI's phased rollout has been calibrated to ensure FPIs and custodians can opt into T+0 only when their pay-in and pay-out plumbing is ready, so as of the current beta phase that began 28 March 2024, retail and proprietary flows are the primary T+0 users.

Will T+0 change the capital gains date for tax?

No. The date of transfer for capital gains tax under the Income-tax Act is the contract note date, which is the trade date - not the settlement date. T+0 only changes when cash and stock physically move, not when the gain or loss is crystallised for tax. The same applies to the dividend record date and corporate action eligibility, which are tied to the depository ledger on the relevant cut-off date.

What is a Qualified Stock Broker (QSB) and why does it matter for T+0?

The QSB framework introduced by SEBI designates large brokers with stricter compliance, technology and capital adequacy norms. T+0 expansions have prioritised member readiness, since the same-day cycle requires more robust risk-management and pay-in systems than the legacy T+1 default. Whether your broker is on the QSB list determines whether you can practically access the optional T+0 window for eligible scrips.