Why Spot FX Uses a Standard Settlement Convention

Summary

The document asks why spot foreign exchange is conventionally quoted and traded with settlement on a T+2 basis when overnight or T+1 transactions are also possible. The response points to the operational time historically needed to record trades, coordinate back-office processing, and arrange settlement. Time-zone differences add coordination challenges, while not every counterparty has systems capable of completing the process within a day.

The explanation connects the convention to the conditions under which market standards evolved, noting that faster straight-through processing is now available at many top-tier banks. It does not claim that every institution can settle as quickly, nor does it provide transaction-volume statistics. The answer says such data are generally restricted and offers only a qualitative expectation that spot trading is much larger than overnight activity. Thus, the document explains the historical and operational rationale but does not quantify current market shares or establish a universal settlement rule.

Key ideas

• Spot FX conventionally refers to trades settling on a T+2 basis.
• Overnight and T+1 settlement are possible, but processing and coordination take time.
• Back-office workflows and time-zone differences helped shape the convention.
• Modern straight-through processing can shorten timelines at some institutions, but capabilities vary.
• The response provides no public volume figures and only conjectures that spot trading is larger than overnight activity.

Tags

# Why is spot FX standard if overnight forwards are available?


# Why is spot FX standard if overnight forwards are available?












A spot FX transaction means agreeing to an FX rate to settle on a T+2 basis.

Though there are transactions that deliver/settle overnight/T+1. Why is spot, therefore, the standard benchmark trade, and not overnight? Are there statistics on volume?

## Answer by Attack68 (score 2)

https://quant.stackexchange.com/a/40987

Because it takes time for things to process and settle in back office systems, i.e. record the trade, process the trade, pass information to relevant support teams, ensure that settlement takes place at the right time. Don't forget timezones are a complication also.

Maybe with straight through processing (STP) of the top tier digital systems in most banks nowadays it could be performed within a day, but this wasn't true for the majority of the last 50 years when standards evolved, and it certainly is not true for all counterparties still.

Volume data is available but I believe it is restricted access as generally accumulated between bank market makers (who own it). I have not seen it but I strongly suspect spot is far, far more voluminous than overnight.

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.