Trade settlement is the process by which the obligations agreed at trade execution are actually fulfilled: securities are delivered, cash is paid, and the trade is complete. Settlement is the operational end-point of every trade, and failures to settle — 'fails' — carry escalating consequences under modern regulatory regimes.
Settlement cycles
Most equity trades settle on a T+2 basis — two business days after the trade date. UK gilts settle T+1. OTC derivatives typically do not settle in the traditional sense: they generate periodic cash flows (coupons, rate resets) and ultimately a final cash settlement or physical delivery at maturity.
The settlement cycle is not just an operational convention — it is a risk management tool. The longer the cycle, the more opportunity for market prices to move before settlement, creating replacement cost risk. Post-financial crisis reform has pushed settlement cycles shorter: T+1 settlement is increasingly the norm for equities in major markets.
How settlement works
For a bond or equity trade, settlement occurs through a central securities depository (CSD) — Euroclear or Clearstream for European markets, DTC for US equities. On settlement date, the CSD simultaneously delivers the securities to the buyer's account and the cash to the seller's account. This delivery-versus-payment (DvP) mechanism eliminates the risk that one party delivers without receiving the other leg.
For derivatives cash flows, settlement occurs through correspondent banking networks via SWIFT messages. The bank sends payment instructions through its nostro account at a correspondent bank in the relevant currency.
What can go wrong
Settlement fails occur when a party cannot deliver securities or cash on the contractual settlement date. Common causes include: late trade capture, a broken chain of upstream deliveries (chain fails), stock borrowing shortfalls for short positions, and counterparty error. Regulatory penalties under the CSDR Settlement Discipline Regime and mandatory buy-in procedures create strong incentives to resolve fails quickly.
The full mechanics of settlement infrastructure, how fail rates are monitored, and how operations teams manage exceptions are explored in Market Mechanics — the complete plain-English guide to how a bank's markets business works.