A matched trade is just a promise. Your buyer owes money and your seller owes shares. Two failures could unravel it: your counterparty defaults, or the delivery logistics break down. The plumbing kills both risks.
What do the clearing corporation and depositories do?
The clearing corporation (CCP) and novation. The instant a trade matches, the exchange's clearing corporation, NSE Clearing (NSCCL) or BSE's ICCL in India and the DTCC subsidiary NSCC in the US, steps into the middle via novation. It becomes the buyer to every seller and the seller to every buyer. You no longer care who was on the other side, because your counterparty is now the CCP. The CCP protects itself with member margins collected upfront and a layered default fund. India is unusually strict here. Under the post-2020 "peak margin" regime, brokers must collect margin from clients before trading, even in cash equities. So if you've wondered why your broker wants funds in the account before you buy, that's the reason.
The depositories. Shares exist as electronic book entries. In India they sit at NSDL and CDSL, where your own demat account holds them and you're the named beneficial owner on the depository's ledger. In the US, nearly all shares sit at DTC, registered to its nominee Cede & Co. Your broker's records say which customers own what, and that's called "street name" holding. In practice that difference is large. An Indian company can read its actual owners off the depository files each quarter, which is where the granular shareholding pattern you'll use constantly comes from. A US company sees only DTC and must reconstruct beneficial ownership through broker chains. It's one reason US proxy voting plumbing is famously creaky.
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How does T+1 settlement work?
The cycle: T+1 in both countries. India completed its move to T+1 rolling settlement in January 2023. It now also offers an optional same-day T+0 window for a large set of stocks. That's a beta expanding by phases, so verify the current scope on the exchange sites. The US moved to T+1 on May 28, 2024. So in both markets, you trade on Tuesday and on Wednesday the CCP's pay-in/pay-out swaps money and shares. Shares appear in the buyer's demat account in India, or broker account in the US, that same Wednesday. If a seller fails to deliver in India, the exchange runs an auction to buy the shares in, at the defaulter's cost.
A generation ago India settled in fortnightly account periods with paper certificates, and the US at T+5. The direction of travel hasn't changed in all that time. Compress the time and you kill the risk.
How does T+1 change record dates and ex-dates?
Record dates and ex-dates under T+1, made reflexive. Entitlements (dividends, rights, bonus shares, AGM votes) go to whoever is on the register on the record date. Ownership transfers at settlement, and the trade date doesn't count. Under T+1, buying on the record date itself settles a day late. So the ex-date now equals the record date in both India and the US, and to receive the dividend you must buy at least one business day before the record date. Say the record date is a Friday. Buy by Thursday and you settle on Friday, in time. Buy on Friday and you settle on Monday, too late, and you've "bought the stock ex-dividend." On the ex-date the stock opens lower by roughly the dividend, all else equal, because the entitlement has left the share. Analysts live on corporate-action calendars, which the exchange websites publish. Get an ex-date wrong and your return calculations, chart reading and dividend-capture arithmetic all go wrong with it.