Pay-in and pay-out are the two halves of settlement. Pay-in is when the buyer's money and the seller's shares are handed over to the exchange's clearing corporation; pay-out is when the clearing corporation delivers those shares to the buyer and that money to the seller.
Why are there two steps at all?
Because the buyer and seller never deal with each other directly. Everything flows through the clearing corporation, which collects from both sides first (pay-in) and distributes to both sides after (pay-out). Collecting everything before releasing anything is what lets it guarantee that neither side is left empty-handed.
Each settlement therefore has four movements. Two pay-ins and two pay-outs:
| Leg | Pay-in (into the clearing corporation) | Pay-out (from the clearing corporation) |
|---|---|---|
| Funds | Buyer's money is collected | Money is released to the seller |
| Securities | Seller's shares are collected | Shares are credited to the buyer's demat account |
A trade traced from both sides
On Tuesday, Ramesh buys 50 shares of Kaveri Motors at ₹400 each, ₹20,000 in total. On the other side of the trade, Meera sells the same 50 shares from her demat account.
Trade day (Tuesday): the exchange matches the two orders. Ramesh's broker blocks his ₹20,000; Meera's shares are earmarked for delivery. Nothing has changed hands yet.
Settlement day (Wednesday, under T+1):
- Funds pay-in. Ramesh's ₹20,000 moves from his broker to the clearing corporation.
- Securities pay-in. Meera's 50 shares move from her demat account to the clearing corporation, through her broker acting as depository participant.
- Securities pay-out, the clearing corporation credits the 50 shares to Ramesh's demat account.
- Funds pay-out, the clearing corporation releases ₹20,000 towards Meera, and it reaches her trading account.
By Wednesday evening, Ramesh holds the shares and Meera has her money. Neither ever knew who the other was, and neither needed to trust the other, because the clearing corporation stood in the middle.
In practice, brokers and the clearing corporation settle on a net basis: all of a broker's buy and sell obligations in a stock for the day are netted, and only the net quantity and net money actually move. Your own account, though, always reflects your full trade.
What if one side fails its pay-in?
The system doesn't let the honest side suffer. If a seller fails to deliver shares by the pay-in deadline (a short delivery) the clearing corporation sources them through an auction so the buyer still gets their pay-out; the cost lands on the seller who defaulted. If you sell shares that are still on their way to your demat account, this is exactly the risk you're exposed to. See what happens if I sell shares before they are delivered to my demat account?
Things to keep in mind
- Pay-in and pay-out apply to both legs of every trade: money and securities each have their own pay-in and pay-out.
- Direction is from your point of view in the market's books: pay-in goes into the clearing corporation, pay-out comes from it.
- Deadlines matter. A missed securities pay-in becomes a short delivery, and an auction with penalties follows.
- Pay-out timing follows the settlement calendar. Weekends and settlement holidays push it to the next working day.
Read next
What is a clearing corporation? — The institution standing between buyer and seller, guaranteeing both.